How Can I Efficiently Invoke Java Functions from C Code?

Invoking Java Functions from C Code

While invoking Java functions from a C application is possible via command-line methods, there are more efficient approaches available.

Creating a Java Virtual Machine for Function Invocation

To execute Java functions directly from C , you can create a Java Virtual Machine (JVM) using the procedure outlined in "Creating a JVM from C." This process involves loading the Java runtime library and creating a JVM instance. Once the JVM is established, you can invoke Java methods using the JNIEnv* interface.

Caching JNIEnv* for Callback Situations

In cases where your C program is invoked from a Java program, the JVM already exists. In such scenarios, caching the JNIEnv* pointer can improve performance. However, caching pointers to the JVM from C/C requires caution due to potential semantic issues and limitations on what can be cached.

JNI Reference for Proper Usage

For detailed guidelines on caching JNI pointers, refer to the JNI Reference. This resource provides comprehensive information on the appropriate usage of JNI functions and can help you avoid pitfalls when working with Java-C interoperability.

The above is the detailed content of How Can I Efficiently Invoke Java Functions from C Code?. For more information, please follow other related articles on the PHP Chinese website!