Lasso Types and Methods for LJAPI¶

This chapter provides a reference to all of the types and functions in LJAPI.

Methods¶

ljapi_initialize()¶: Creates a Java Virtual Machine for the running Lasso thread. A Lasso Server instance calls this method when it starts up.

java_jvm_getenv(...)¶: This is the wrapper method for the java_jnienv object associated with the Lasso instance’s Java Virtual Machine. This is the method you will use to access the Java Native Interface functions documented as member methods of java_jnienv.

Main Lasso Type¶

type java_jnienv¶

java_jnienv()

Creates an object that is used to call Java Native Interface (JNI) functions. These functions are all documented in the JNI documentation.

For your convenience, the sections below are arranged in the same order and grouping as the JNI documentation.

Version¶

java_jnienv->GetVersion(...)¶

Returns the version of the Java Native Interface.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp15951 for more information.

Class Operations¶

java_jnienv->FindClass(...)¶

Returns a reference to a Java class. It takes a string of the fully qualified class name or array type signature.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16027 for more information.

Exceptions¶

java_jnienv->Throw(...)¶

Throws a Java error (java.lang.Throwable). It takes a jobject thrown error reference and returns a jint.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16086 for more information.

java_jnienv->ThrowNew(...)¶

Creates and throws a Java error with the message passed to it. It takes a jobject class reference to use to create the error, and a string with the error message. It returns a jint.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16104 for more information.

java_jnienv->ExceptionOccurred(...)¶

Returns whether or not a Java exception was thrown.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16124 for more information.

java_jnienv->ExceptionDescribe(...)¶

Outputs the error and stack trace for the Java exception.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16146 for more information.

java_jnienv->ExceptionClear(...)¶

Clears any exceptions that have been thrown.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16166 for more information.

java_jnienv->FatalError(...)¶

Throws a fatal error to the JVM. It takes a string as the error message.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16186 for more information.

java_jnienv->ExceptionCheck(...)¶

Returns “true” if a Java exception has been thrown, otherwise returns “false”.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16270 for more information.

Global and Local References¶

java_jnienv->NewGlobalRef(...)¶

Creates a global reference from the specified object. It takes a jobject reference to an object and returns a new jobject global object reference.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#NewGlobalRef for more information.

java_jnienv->DeleteGlobalRef(...)¶

Removes the specified global reference. It takes a jobject reference to a global object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#DeleteGlobalRef for more information.

java_jnienv->DeleteLocalRef(...)¶

Removes the specified local reference. It takes a jobject reference to an object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#DeleteLocalRef for more information.

Object Operations¶

java_jnienv->AllocObject(...)¶

Allocates a Java object without calling any of the constructor methods. It takes a jobject class reference (like the return value of java_jnienv->FindClass). It returns a reference to the object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16337 for more information.

java_jnienv->NewObject(...)¶

Allocates and constructs a Java object. It takes a jobject class reference to the new object’s class, a jmethodid reference to the constructor method to use, and any other parameters as required by the Java constructor method. It returns a reference to the object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4517 for more information.

java_jnienv->GetObjectClass(...)¶

Returns a class reference for the specified object. It takes a jobject object reference.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16454 for more information.

java_jnienv->IsInstanceOf(...)¶

Returns “true” if the specified object is an instance of the specified class, otherwise returns “false”. It takes a jobject object reference and a jobject class reference.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16472 for more information.

java_jnienv->IsSameObject(...)¶

Returns “true” if both specified objects refer to the same Java object, otherwise returns “false”. It takes two jobject object references.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16514 for more information.

Accessing Fields of Objects¶

java_jnienv->GetFieldID(...)¶

Returns the field ID of a Java object’s instance field. It takes a jobject class reference, a string with the value of the field’s name, and a string of the signature for the field. It returns a jfieldid reference.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16540 for more information.

java_jnienv->GetObjectField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java objects. It takes in a jobject object reference and a jfieldid reference and returns a jobject object reference.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetBooleanField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are boolean primitives. It takes in a jobject object reference and a jfieldid reference and returns a boolean.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetByteField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java byte primitives. It takes in a jobject object reference and a jfieldid reference and returns a jbyte.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetCharField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java char primitives. It takes in a jobject object reference and a jfieldid reference and returns a jchar.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetShortField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java short primitives. It takes in a jobject object reference and a jfieldid reference and returns a jshort.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetIntField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java int primitives. It takes in a jobject object reference and a jfieldid reference and returns a jint.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetLongField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java long primitives. It takes in a jobject object reference and a jfieldid reference and returns a Lasso integer.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetFloatField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java float primitives. It takes in a jobject object reference and a jfieldid reference and returns a Lasso decimal.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->GetDoubleField(...)¶

Returns the value of the specified Java object instance field. This method should be used for field values that are Java double primitives. It takes in a jobject object reference and a jfieldid reference and returns a Lasso decimal.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16572 for more information.

java_jnienv->SetObjectField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java objects. It takes a jobject object reference, a jfieldid reference, and the new jobject value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetBooleanField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java boolean primitives. It takes a jobject object reference, a jfieldid reference, and the new boolean value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetByteField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java byte primitives. It takes a jobject object reference, a jfieldid reference, and the new jbyte value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetCharField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java char primitives. It takes a jobject object reference, a jfieldid reference, and the new jchar value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetShortField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java short primitives. It takes a jobject object reference, a jfieldid reference, and the new jshort value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetIntField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java int primitives. It takes a jobject object reference, a jfieldid reference, and the new jint value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetLongField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java long primitives. It takes a jobject object reference, a jfieldid reference, and the new integer value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetFloatField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java float primitives. It takes a jobject object reference, a jfieldid reference, and the new jfloat value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

java_jnienv->SetDoubleField(...)¶

Sets the value of the specified Java object instance field. This method should be used for fields that contain Java double primitives. It takes a jobject object reference, a jfieldid reference, and the new decimal value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16613 for more information.

Calling Instance Methods¶

java_jnienv->GetMethodID(...)¶

Returns a jmethodid Lasso object for the Java object’s specified instance member method. For constructor methods, use “<init>” as the method name.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16660 for more information.

java_jnienv->CallVoidMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the method doesn’t return a value. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallObjectMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java object returned as a Lasso jobject object reference. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallBooleanMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a boolean value. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallByteMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java byte primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallCharMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java char primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallShortMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java short primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallIntMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java int primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallLongMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java long primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallFloatMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java float primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallDoubleMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java double primitive. It takes a jobject object reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4256 for more information.

java_jnienv->CallNonvirtualVoidMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when there will be no return value. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualObjectMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java object. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualBooleanMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a boolean. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualByteMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java byte primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualCharMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java char primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualShortMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java short primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualIntMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java int primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualLongMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java long primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualFloatMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java float primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

java_jnienv->CallNonvirtualDoubleMethod(...)¶

Calls the specified Java instance method with the expected parameters passed as the remaining Lasso parameters to this method. This method should be used when the return value will be a Java double primitive. It takes a jobject object reference, a jobject class reference, a jmethodid, and any parameters to be passed to the instance method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4581 for more information.

Accessing Static Fields¶

java_jnienv->GetStaticFieldID(...)¶

Returns a jfieldid reference to a Java class’s static field. It takes a jobject class reference, a string with the value of the field’s name, and a string of the signature for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp16823 for more information.

java_jnienv->GetStaticObjectField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java objects. It takes in a jobject class reference and a jfieldid reference and returns a jobject object reference.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticBooleanField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are boolean primitives. It takes in a jobject class reference and a jfieldid reference and returns a boolean.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticByteField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java byte primitives. It takes in a jobject class reference and a jfieldid reference and returns a jbyte.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticCharField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java char primitives. It takes in a jobject class reference and a jfieldid reference and returns a jchar.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticShortField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java short primitives. It takes in a jobject class reference and a jfieldid reference and returns a jshort.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticIntField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java int primitives. It takes in a jobject class reference and a jfieldid reference and returns a jint.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticLongField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java long primitives. It takes in a jobject class reference and a jfieldid reference and returns a Lasso integer.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticFloatField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java float primitives. It takes in a jobject class reference and a jfieldid reference and returns a Lasso decimal.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->GetStaticDoubleField(...)¶

Returns the value of the specified Java class static field. This method should be used for field values that are Java double primitives. It takes in a jobject class reference and a jfieldid reference and returns a Lasso decimal.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20752 for more information.

java_jnienv->SetStaticObjectField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java objects. It takes a jobject class reference, a jfieldid reference, and the new jobject value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticBooleanField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java boolean primitives. It takes a jobject class reference, a jfieldid reference, and the new boolean value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticByteField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java byte primitives. It takes a jobject class reference, a jfieldid reference, and the new jbyte value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticCharField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java char primitives. It takes a jobject class reference, a jfieldid reference, and the new jchar value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticShortField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java short primitives. It takes a jobject class reference, a jfieldid reference, and the new jshort value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticIntField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java int primitives. It takes a jobject class reference, a jfieldid reference, and the new jint value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticLongField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java long primitives. It takes a jobject class reference, a jfieldid reference, and the new integer value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticFloatField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java float primitives. It takes a jobject class reference, a jfieldid reference, and the new jfloat value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

java_jnienv->SetStaticDoubleField(...)¶

Sets the value of the specified Java class static field. This method should be used for fields that contain Java double primitives. It takes a jobject class reference, a jfieldid reference, and the new decimal value for the field.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20829 for more information.

Calling Static Methods¶

java_jnienv->GetStaticMethodID(...)¶

Returns a jmethodid Lasso object for the specified static method. It takes a jobject class reference, a string specifying the name of the method, and a string of the method’s signature.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp20950 for more information.

java_jnienv->CallStaticVoidMethod(...)¶

Calls a Java class static method that doesn’t return a value. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticObjectMethod(...)¶

Calls a Java class static method that returns a Java object. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticBooleanMethod(...)¶

Calls a Java class static method that returns a Java boolean. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticByteMethod(...)¶

Calls a Java class static method that returns a Java byte primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticCharMethod(...)¶

Calls a Java class static method that returns a Java char primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticShortMethod(...)¶

Calls a Java class static method that returns a Java short primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticIntMethod(...)¶

Calls a Java class static method that returns a Java int primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticLongMethod(...)¶

Calls a Java class static method that returns a Java long primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticFloatMethod(...)¶

Calls a Java class static method that returns a Java float primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

java_jnienv->CallStaticDoubleMethod(...)¶

Call a Java class static method that returns a Java double primitive. It takes a jobject class reference, a jmethodid for the method, and any parameters to be passed to the static method.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4796 for more information.

String Operations¶

java_jnienv->NewString(...)¶

Takes a Lasso string and returns a Lasso jobject that corresponds to a Java object of class java.lang.String.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp4925 for more information.

java_jnienv->GetStringLength(...)¶

Returns the number of characters in the specified Java string object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17132 for more information.

java_jnienv->GetStringChars(...)¶

Takes a jobject of a Java string and returns a Lasso string object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17158 for more information.

Array Operations¶

java_jnienv->GetArrayLength(...)¶

Returns the number of elements in the specified Java array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp21732 for more information.

java_jnienv->NewObjectArray(...)¶

Returns a jobject of a Java array containing Java objects of the specified class. It takes the length of the array, a jobject class reference for the type of objects in the array, and the initial value to set each item in the array to.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp21619 for more information.

java_jnienv->GetObjectArrayElement(...)¶

Returns the specified element of a Java object array. It takes the jobject containing the array and an integer specifying the index into the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp21671 for more information.

java_jnienv->SetObjectArrayElement(...)¶

Sets the value at the specified index of the specified Java object array. It takes a jobject of the array, an integer specifying the index into the array, and the new jobject object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp21699 for more information.

java_jnienv->NewBooleanArray(...)¶

Returns a jobject of a Java array containing Java booleans. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewByteArray(...)¶

Returns a jobject of a Java array containing Java byte primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewCharArray(...)¶

Returns a jobject of a Java array containing Java char primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewShortArray(...)¶

Returns a jobject of a Java array containing Java short primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewIntArray(...)¶

Returns a jobject of a Java array containing Java int primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewLongArray(...)¶

Returns a jobject of a Java array containing Java long primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewFloatArray(...)¶

Returns a jobject of a Java array containing Java float primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->NewDoubleArray(...)¶

Returns a jobject of a Java array containing Java double primitives. It takes the length of the array.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17318 for more information.

java_jnienv->GetBooleanArrayElements(...)¶

Takes a jobject Java boolean array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetByteArrayElements(...)¶

Takes a jobject Java byte array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetCharArrayElements(...)¶

Takes a jobject Java char array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetShortArrayElements(...)¶

Takes a jobject Java short array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetIntArrayElements(...)¶

Takes a jobject Java int array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetLongArrayElements(...)¶

Takes a jobject Java long array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetFloatArrayElements(...)¶

Takes a jobject Java float array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetDoubleArrayElements(...)¶

Takes a jobject Java double array and returns a Lasso staticarray of the elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp17382 for more information.

java_jnienv->GetBooleanArrayRegion(...)¶

Returns the specified region of elements from a Java boolean array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetByteArrayRegion(...)¶

Returns the specified region of elements from a Java byte array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetCharArrayRegion(...)¶

Returns the specified region of elements from a Java char array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetShortArrayRegion(...)¶

Returns the specified region of elements from a Java short array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetIntArrayRegion(...)¶

Returns the specified region of elements from a Java int array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetLongArrayRegion(...)¶

Returns the specified region of elements from a Java long array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetFloatArrayRegion(...)¶

Returns the specified region of elements from a Java float array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->GetDoubleArrayRegion(...)¶

Returns the specified region of elements from a Java double array in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, and an integer specifying the number of elements.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp6212 for more information.

java_jnienv->SetBooleanArrayRegion(...)¶

Replaces the specified portion of a Java boolean array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetByteArrayRegion(...)¶

Replaces the specified portion of a Java byte array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetCharArrayRegion(...)¶

Replaces the specified portion of a Java char array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetShortArrayRegion(...)¶

Replaces the specified portion of a Java short array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetIntArrayRegion(...)¶

Replaces the specified portion of a Java int array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetLongArrayRegion(...)¶

Replaces the specified portion of a Java long array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetFloatArrayRegion(...)¶

Replaces the specified portion of a Java float array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

java_jnienv->SetDoubleArrayRegion(...)¶

Replaces the specified portion of a Java double array with the values specified in a Lasso staticarray. It takes a jobject of the array, an integer for the start index of the array region, an integer specifying the number of elements to replace, and a staticarray containing the values to use.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp22933 for more information.

Monitor Operations¶

java_jnienv->MonitorEnter(...)¶

Enters into the monitor associated with the specified Java object. Requires a non-null jobject object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp23124 for more information.

java_jnienv->MonitorExit(...)¶

Decrements the monitor counter for the current thread and the specified Java object. Requires a non-null jobject object.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#wp5252 for more information.

Reflection Support¶

java_jnienv->FromReflectedMethod(...)¶

Converts a specified Java reflection object into a Lasso jmethodid.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#from_reflected_method for more information.

java_jnienv->FromReflectedField(...)¶

Converts a specified Java reflection field object into a Lasso jfieldid.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#from_reflected_field for more information.

java_jnienv->ToReflectedMethod(...)¶

Converts a specified Lasso jmethodid to a Java reflection object returned as a jobject.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#to_reflected_method for more information.

java_jnienv->ToReflectedField(...)¶

Converts a specified Lasso jfieldid to a Java reflection field object returned as a jobject.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html#to_reflected_field for more information.

Return Types¶

type jobject¶

jobject()

Stores a reference to either a Java class, instantiated object, or thrown error.

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/types.html#wp15954 for more information.

type jmethodid¶

jmethodid()

Stores the JNI ID for a specific method (both member methods and class methods).

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/types.html#wp1064 for more information.

type jfieldid¶

jfieldid()

Stores the JNI ID for data field members of a class (both an object’s and the class’s).

See http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/types.html#wp1064 for more information.

Helper Types for Java Data Primitives¶

type jfloat¶

jfloat(value::decimal)

jfloat(value::integer)

jfloat(value::jfloat): Creates an object that can be passed to a Java method as a Java float primitive.

type jint¶

jint(value::integer): Creates an object that can be passed to a Java method as a Java integer primitive.

type jshort¶

jshort(value::integer): Creates an object that can be passed to a Java method as a Java short primitive.

type jchar¶

jchar(value::string): Creates an object that can be passed to a Java method as a Java char primitive.

type jchararray¶

jchararray(value::string): Creates an object that can be passed to a Java method as a Java array of char primitives.

type jbyte¶

jbyte(value::bytes): Creates an object that can be passed to a Java method as a Java byte primitive.

type jbytearray¶

jbytearray(value::bytes): Creates an object that can be passed to a Java method as a Java array of byte primitives.