Java methods calling from C/C++

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C++

C

Java

JNI

I need to call some Java methods using C/C++ and then I need to use DPI in UVM or system verilog to call C methods. I dont have access for JAVA files or JAVA classes. I have a .jar file in which my class is present of which methods I need to access.

I am using path of that .jar file in

options.optionString = "-Djava.class.path= path of .jar file

I am able to find class using

clsH = env->FindClass("com/act/testdev/pa5/PA5");

But I am not able to get method ID. I know only method's name in java class which is a boolean method with boolean arguments

com.act.testdev.pa5.PA5.aes_encrypt(key_data, pt_data);

This method is used in some other language and here is the code of that:

boolean[] aes_encrypt(boolean key_data[], boolean pt_data[]) 
{
    return com.act.testdev.pa5.PA5.aes_encrypt(key_data, pt_data);
}

Here is the code which I am trying to use to get the methodID:

if (clsH != NULL)
{
    //midMain       = env->GetMethodID(clsH, "<init>", "([Z[Z)[Z");    
    midMain       = env->GetMethodID(clsH, "aes_encrypt", "([Z[Z)[Z"); 
    printf("\n FOUND able to find the requested class midMain ==%x ==%x\n",midMain,clsH);       
}
else
{
    printf("\nUnable to find the requested class\n");       
}

if (midMain != NULL)
{
    //jstring StringArg = env->NewStringUTF("\nTestCall:Called from the C Program\n");
    printf("\nable to find the requested Method\n");        
    jbooleanArray BoolArg1 = env->NewBooleanArray(128);
    jbooleanArray BoolArg2 = env->NewBooleanArray(128);
    env->CallBooleanMethod(clsH,midMain,BoolArg1,BoolArg2);
    //env->CallStaticVoidMethod(clsH, midMain, NULL); //Calling the main method.
    //env->CallBooleanMethod(clsH, midMain, BoolArg); //Calling the main method.
}

Please help me on this how can I access this method in c/c++. there are some more methods also I need to call in same way once I am able to call this will try those later. I dont have any Idea of JAVA I got this code online as a example of how to call java methods from c/c++.


What I have tried:

I have created a CTest.cpp file in that I have just given path for .jar file which has java classes. and I am just using this command to execute the .cpp file

g++ -I/soft/uo/jdk1.8.0_11/include -I/soft/uo/jdk1.8.0_11/include/linux -L/soft/uo/jdk1.8.0_11/jre/lib/amd64/server -ljvm CTest.cpp