How to pass C structs back and forth to Java code in JNI?

You need to create a Java class with the same members as C struct, and 'map' them in the C code via methods env->GetIntField, env->SetIntField, env->GetFloatField, env->SetFloatField, and so on - in short, lots of manual labor, hopefully there already exist programs that do it automatically: JNAerator ( http://code.google.com/p/jnaerator ) and SWIG ( http://www.swig.org ). Both have their pros and cons, the choice is up to you.

It's crashing because Java_com_myorg_MyJavaClass_createNewMyStruct is declared to return "jobject", but is actually returning struct MyStruct. If you ran this with CheckJNI enabled, the VM would complain loudly and abort. Your processData() function is also going to be fairly upset about what it gets handed in "arguments".

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