How Can You Call Java Functions from C ?

Calling Java Functions from C

Inquiring minds want to know how to invoke Java functions from within C applications. While it's possible to make such calls through the command line or other similar methods, we'll delve into a more direct approach.

JNI Magic

The key to this interoperability lies in the Java Native Interface (JNI). It provides a bridge between Java and other languages, including C . By utilizing JNI methods, you can create a JVM (Java Virtual Machine) from C and communicate with it programmatically.

Sample Procedure

To illustrate the process, consider the example presented in "Creating a JVM from C." It provides a step-by-step guide on creating a JVM and invoking a method from C .

Caching Caveats

While caching JNIEnv* pointers to the JVM from C/C is tempting for performance reasons, it's crucial to exercise caution. There are specific semantics involved regarding when and what can be cached. Failure to adhere to these guidelines can lead to unexpected behavior. For more details, refer to the official JNI reference documentation.

Moving Forward

This introduction to JNI provides a foundation for exploring further. With JNI, the possibilities for interaction between Java and C applications are boundless.

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