Object typecast using JNI

Question

hi all
i need to implement this line from native code using JNI:
                FileInputStream fileinputstream = new FileInputStream(filename);
                ObjectInputStream objectinputstream = new ObjectInputStream(fileinputstream);
                LogEventObject Line;
             Line = (LogEventObject)objectinputstream.readObject();
...readObject() returns null
i think this is because readObject() checks type conversion (LogEventObject), but how can i implement this from my native code?
p.s. code works from java w\o any probs

Answer 1

i need to implement this line from native code using JNI:Why? Why not do it at the Java level?
          FileInputStream fileinputstream = new FileInputStream(filename);
          ObjectInputStream objectinputstream = new ObjectInputStream(fileinputstream);
          LogEventObject Line;
     Line = (LogEventObject)objectinputstream.readObject();
...readObject() returns nullThat can only be because somebody wrote a null to the corresponding object output stream.
i think this is because readObject() checks type conversion (LogEventObject)No it doesn't, so it isn't because of that at all. readObject() can't even see that cast. The only way you can get a null from readObject() is if there is a null there waiting to be read. Or, in JNI, if there is a pending exception that you are ignoring, which is the most likely explanation.
p.s. code works from java w\o any probsMoral: don't write anything in JNI that you could write in Java.