The stacktrace shows the NullPointerException is coming from the readSerialData method of the java.io.ObjectInputStream class. Since it's coming from a java class and not a Windchill class, that makes me wonder if this is a bug in the JDK. What JDK version and Windchill version are you using? You might want to try updating to the latest JDK supported by your Windchill version.
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