Run Java code from C++ using JNI (Android)

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1

Hello,
I want to run some java code from C++ but every time I search for a java class using env->FindClass the application crashes telling me that the class do not exist. The class exist but somehow the JNIEnv that I get do not have access to the new java classes. How can I fix that?

To get the JNIENv I do the following:

JNIEnv* env = FAndroidApplication::GetJavaEnv();

I’ve also tried the following, but I go the same result:

JNIEnv* Env = NULL;
GJavaVM->GetEnv((void **)&Env, JNI_VERSION_1_6);
jint AttachThreadResult = GJavaVM->AttachCurrentThread(&Env, NULL);

Thanks for the help

2

Same issue here, I’m using this code but it doesn compile
http://www.codeproject.com/Articles/993067/Calling-Java-from-Cplusplus-with-JNI

It gets stuck in : jint rc = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);

if you find a solution please post, I am trying to implement GCM on my game but I can´t get the InstanceID of the app without java

3

My code compiles, it crashes during runtime, probably you have an other issue

4

I have the same issue. Don’t you solve this problem yet?

5

In my case, the problem was ProGuard tool. ProGuard encrypts names of Java classes to fight against decompilation and hacking. It also affects my normal codes trying to access Java classes. After I disabled ProGuard, the problem was solved.

You can configure ProGuard by editing a text file located in the path below.

Engine/Build/Android/Java/proguard-project.txt

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