On my Android installation with -Xcheck:jni enabled, it will abort with the error "JNI ERROR: non-nullable address is NULL". In other cases the behaviour is undefined.
Fix: check for zero-length C++ buffer and in that case use an empty Java array-backed ByteBuffer to pass to the Java deserializer.
LiFengSC
commented
1 year ago
Protobuf objects that contain only empty or default values take up zero bytes on the wire. In this case the JNI fromCpp() marshaller will try to map a DirectByteBuffer onto a zero-length nullptr C++ buffer, which is forbidden (https://docs.oracle.com/en/java/javase/20/docs/specs/jni/functions.html#newdirectbytebuffer).
On my Android installation with -Xcheck:jni enabled, it will abort with the error "JNI ERROR: non-nullable address is NULL". In other cases the behaviour is undefined.
Fix: check for zero-length C++ buffer and in that case use an empty Java array-backed ByteBuffer to pass to the Java deserializer.