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I wanted to call a C++ method from Java. I read about JNI, but I am not getting how to get all the library files and where I should keep it in order to run the program from command line.
Is there any way to call a C++ method from Eclipse itself, because I am using it to run Java classes.
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Java native interface (JNI) is a framework provided by java that enables java programs to call native code and vice-versa. Using JNI a java program has the capability to call the native C code.
Use javah -jni to generate a C header file ( HelloWorld. h ) containing the function prototype for the native method implementation. The javah tool is provided with JDK or Java 2 SDK releases. Write the C implementation ( HelloWorld.
How to call a C/C++ function from Java then you can use Java Native Interface (JNI), part of the Java platform, is an interface that enables communication between Java applications running on a Java Virtual Machine (JVM) and native applications or libraries written in other programming languages (e.g. C, C++).
Calling a C/C++ function from Java is actually quite easy but requires several steps: The native method must be declared in your Java code. The Java Native Interface (JNI) glue layer needs to be implemented.
While I've used JNI-C++ bridging in the past (only a little though) - it can be a bit ugly. You might want to consider using SWIG to help you generate all the messy boiler plate code.
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If JNI is too complicated you can take a look at JNA. In first case you have to create native wrapper code (in C or C++) to join Java and native (C++/C/...) code. In second case it is done at runtime (so you only need Java code + config).
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