Garbage collection and JNI call

Question

I am having an issue with a JNI program randomly running out of memory.

This is a 32 bit java program which reads a file, does some image processing, typically using

Answer 1

My own approach to this problem is simply to call System.gc(), but from inside the native code:

#include 
// ...
int my_native_function(JNIEnv* env, jobject obj) {
    jclass    systemClass    = nullptr;
    jmethodID systemGCMethod = nullptr;
    // ...
    // Take out the trash.
    systemClass    = env->FindClass("java/lang/System");
    systemGCMethod = env->GetStaticMethodID(systemClass, "gc", "()V");
    env->CallStaticVoidMethod(systemClass, systemGCMethod);
}

I hope this works for you, too.