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    <p>4 ideas to provide you:</p> <p>...</p> <p><em>jclass clazz = env->FindClass("com/path/to/the/class");</em></p> <p>Can you confirm the name is not "com/path/to/the/MyClass" where the classname is uppercase 1st character and obviously the name "class" is a reserved word. There is a slight discrepency between the use of the JNI C symbol name "Java_com_path_to_my_package_renderStuff" and the FindClass() lookup on "com/path/to/the/class"in your example. But since your stackoverflow is not a about UnsatisfiedLinkageError I can only guess your example provided is not consistent with itself.</p> <p>Using my example I would expect the JNI C symbol name to be "Java_com_path_to_the_MyClass_renderStuff" and the FindClass() lookup on "com/path/to/the/MyClass". The use of uppercase 1st letter of class and lowercase 1st letter of method name might be important for linkage purposes.</p> <p>...</p> <p>Are you sure the "jobj" being passed is the same type as the "com/path/to/the/class" you are looking up ? Maybe in your Java code you can wrap your native with:</p> <pre><code>public void renderStuff() { if((this instanceof com.path.to.the.MyClass) == false) throw new RuntimeException("Unexpected class expected: com.path.to.the.MyClass"); renderStuff_internal(); } private native void renderStuff_internal(); </code></pre> <p>Which will ensure that matter in Java code without causing a JVM crash. You would also need to adjust your C symbol name to append the "_1internal" onto the end making "Java_com_path_to_the_MyClass_renderStuff_1internal" (the extra "1" character is intended)</p> <p>...</p> <p>Maybe try belt and braces exception checking in between each statement you list about:</p> <pre><code>if(env-&gt;ExceptionCheck()) { env-&gt;ExceptionDescribe(); env-&gt;ExceptionClear(); } </code></pre> <p>This will pickup things like security violations when trying to do reflection when it might not be allowed.</p> <p>...</p> <pre><code> jclass cls = env-&gt;GetObjectClass(jobj); // instead of FindClass jmethodID mid = env-&gt;GetMethodID(cls, "showCar", "()V"); if(!mid) return; // whoops method does not exist env-&gt;CallVoidMethod(jobj, mid); </code></pre> <p>Another idea to remove the FindClass() call. This would work with any class that GetMethodID worked on, kind of like dyhamic typing / late-binding.</p>
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