c++中存在一个类指针，如何通过jni在java中获得这个类指针和类的转换器
等级a\U b.cpp

Class ClassB
{
public:
    int funcA();
    int funcB();
}
Class ClassA
{
public:
    virtual void func(){B = new ClassB();};
    ClassB* B;
    ClassB* GetClassB(){return B;};
}

jni\ U a级\U b.cpp

ClassA TestClassA = new ClassA();

extern "C"
JNIEXPORT jobject JNICALL Java_com_core_Android_getClassB(JNIEnv *env, jobject thiz)
{
    return (jobject)TestClassA->GetClassB();    // It will crash, how to converter class pointer to jobject?
}

获取类B.java

public native ClassB getClassB();
public void TestFunction()
{
    ClassB B = getClassB();
}