Jni findclass static initializer

2020-02-24 17:04 How can the answer be improved?

JNI RegisterNatives with native call in static initializer. The above code fails after JNIEnv. FindClass is called, because FindClass runs the static initializer block of the target class. In this case, the target class calls a native method that will only be linked after the RegisterNatives call. jni findclass static initializer

Caching Field and Method IDs Obtaining field and method IDs expensive symbol lookups based on member name descriptor best to cache at the point of use, or in the class static initializer Caching lazy init: race condition harmless duplicate checks and initialization of same field

Jan 09, 2018  Home C FindClass from any thread in Android JNI. FindClass from any thread in Android JNI. Posted by: There is regular JNI and another one that I wrote myFindClass In C11 a new feature was introduced where the programmer can initialize class member variables inside classs definition, see code jni findclass static initializer

Any FindClass calls made as part of executing JNIOnLoad will use the class loader associated with the function that called System. loadLibrary (this is a special rule, provided to make library initialization more convenient). If your app code is loading the library, FindClass will use the correct class loader. Java Programming Tutorial Java Native Interface (JNI) Java supports native codes via the Java Native Interface (JNI). JNI is difficult, as it involves two languages and runtimes. I shall assume that you are familiar with: Java. CC and the GCC Compiler (Read GCC and Make ). The static initializer invokes System. loadLibrary() Nov 07, 2012 Android's JNI tips page mentions this FAQ: Why didn't FindClass find my class? They mention multiple solutions and the last option there is this one: Cache a reference to the ClassLoader object somewhere handy, and issue loadClass calls directly. jni findclass static initializer static JavaVM cachedJVM; JNIEXPORT jint JNICALL JNIOnLoad(JavaVM jvm, void reserved) cachedJVM jvm; Any other initialization code. Once you have the ref to the JavaVM pointer you can then use the method Michael Mrozek described in the above post. NativeClass is the only class that needs to be accessed in JNIOnLoad. Previously, all files were compiled into a single library, which is loaded in another class, but now I separated the functionality of NativeClass into a separate library which is loaded in the static initializer of NativeClass. I'd like to compile everything into only one A tutorial to master the Java Native Interface with C. 13, 847, 637 members. Sign in. Email. Password Forgot your password? Calling Java from C with JNI. Whenever you call findClass() method of JNI for a specific class, ensure that you mentioned all the required jars while loading of JVM in C.

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