Call Java from C++

#include <cstdio>
#include <jni.h>
#include <cassert>

class CJava {
public:
    CJava()
    {
        JavaVMInitArgs args;
        JavaVMOption options;
        args.version = JNI_VERSION_1_6;
        args.nOptions = 1;
        options.optionString = "-Djava.class.path=./";
        args.options = &options;
        args.ignoreUnrecognized = false;
        int res = JNI_CreateJavaVM(&m_javaVM, (void**)&m_jniEnv, &args);
        if (res < 0 || m_jniEnv == nullptr)
        {
            printf("Unable to Launch JVM, error %d\n", res);
            assert(false);
        }
        printf("Started JVM\n");
    }

    JNIEnv* GetJNIEnv()
    {
        return m_jniEnv;
    }

private:
    JavaVM* m_javaVM;
    JNIEnv* m_jniEnv;
};

int main(int argc, char* argv[])
{
    CJava* java = new CJava();

    jclass testClass = java->GetJNIEnv()->FindClass("TestClass");
    assert(testClass != nullptr);

    jmethodID mainMethod = java->GetJNIEnv()->GetStaticMethodID(testClass, "testMethod", "()V");
    assert(mainMethod != nullptr);
    java->GetJNIEnv()->CallStaticVoidMethod(testClass, mainMethod, nullptr);

    return 0;
}