JNI DEFINED ERROR IN APPLICATION: JNI GetMethodID, called with a pending exception java.lang.ClassNotFoundException: could not find the class

Question

I get the following error:

JNI DETECTED ERROR IN APPLICATION: JNI GetMethodID, called with a pending exception java.lang.ClassNotFoundException: could not find the class "package.name.class" in the path: DexPathList [[zip file] /system/framework/sample.jar "], nativeLibraryDirectories = [/ vendor / lib, / system / lib]]

JNI DETECTED ERROR IN APPLICATION: JNI GetMethodID called with pending exception java.lang.ClassNotFoundException: Didn't find class "package.name.class" on path: DexPathList[[zip file "/system/framework/XposedBridge.jar"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] 26771-26918/package.name.class A/art: art/runtime/java_vm_ext.cc:410] at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56) 26771-26918/package.name.class A/art: art/runtime/java_vm_ext.cc:410] at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:511) 26771-26918/package.name.class A/art: art/runtime/java_vm_ext.cc:410] at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:469) 

More about the error:

 `jmethodID MethodId; JNIEnv * env; int nStatus = gVM->GetEnv((void**)&env, JNI_VERSION_1_6); int nResult = attachStatus(nStatus, &env); LOG_HM("::attach status = %d::\n", nResult); if (nResult == ATTACH_FAILED) { LOG_HM("Attach failed"); return ; } jclass classClass = env->GetObjectClass(gTotalUsageClass); auto classLoaderClass = env->FindClass("java/lang/ClassLoader"); auto getClassLoaderMethod = env->GetMethodID(classClass, "getClassLoader", "()Ljava/lang/ClassLoader;"); gClassLoader = env->CallObjectMethod(gTotalUsageClass, getClassLoaderMethod); gFindClassMethod = env->GetMethodID(classLoaderClass, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;"); jclass totalUsage = static_cast<jclass>(env->CallObjectMethod(gClassLoader, gFindClassMethod, env->NewStringUTF("com/a/a/TotalUsageInfo"))); TotalUsageInfo *info = NULL; jobject jUsageInfo = NULL; jlong noOfProc = 0; jlong memTotal = 0; jlong memFree = 0; jlong cache = 0; jlong buffer = 0; jlong cpuUtil = 0; //jclass totalUsage = env->FindClass("com/a/a/TotalUsageInfo"); if (totalUsage == NULL) { LOG_HM("Class TotalUsageInfo not Found \n"); nResult = FAIL; detachThread(nResult); return; } else { LOG_HM("Class TotalUsageInfo Found \n"); } jmethodID constructor = env->GetMethodID(totalUsage, "<init>", "(JJJJJJ)V"); if (NULL == constructor) { LOG_HM("JNIGetTotalUsageInfo::TotalUsageInfo constructor not found\n"); nResult = FAIL; detachThread(nResult); return ; }` 

Answer 1

To call GetMethodID , you need to properly attach your C ++ stream to the main Java stream. Like this:

 bool attachThreadToJVM(JNIEnv **env) { bool ret = false; if(globalJavaVm != NULL) { JavaVMAttachArgs vmAttachArgs; vmAttachArgs.version = JNI_VERSION_1_6; vmAttachArgs.name = NULL; vmAttachArgs.group = NULL; jint attachRet = globalJavaVm->AttachCurrentThread(env, &vmAttachArgs); if(attachRet == 0) { ret = true; } } return ret; }