Agreed.
I imagine the webkit infrastructure will have a well defined shutdown
process (that may include sending messages to a native event look,
possibly asking the user for permission to close browser windows, or
whatever).
That may be another good place to env->DeleteGlobalRef(MyWhateverClass),
allowing then the JNI_OnUnload call.
Cheers,
Antonio
El 9/4/21 a las 14:21, Jaroslav Tulach escribió:
Hi,
JNI_OnLoad has a companion JNI_OnUnload [1], which is the perfect place
to invoke an env->DeleteGlobalRef(MyWhateverClass), allowing the JVM
garbage collector to do a proper cleanup.
That method is called "when the class loader containing the native library is
garbage collected." However the class loader cannot be GCed, because it is
referenced from one of the `java.lang.Class` objects it loaded. That class is
then referenced by `env->NewGlobalRef(clazz);` - e.g. it a global GC root. As
the `ClassLoader` is never GCed, the `JNI_OnUnload` is never called and cannot
do the cleanup.
Memory leak, I am afraid.
-jt
[1]
https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/invocation.h
tml#JNI_OnUnload
El 8/4/21 a las 5:28, Jaroslav Tulach escribió:
JNI_OnLoad(...) {
// Find the class in OnLoad
jclass clazz = env->FindClass(...);
// And keep a NewGlobalRef for future use...
MyWhateverClass = env->NewGlobalRef(clazz);
...
That's the recommended approach. However it shall be stated that this is
creating a (class loading) memory leak - it is not going to be possible to
unload the JavaFX JAR file classes once this variable is initialized. Just
FYI, I think we can live with such behavior.
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