Hi,
I'm trying to serialize a Start object of the java grammar.
I'm doing this by adding "implements java.io.Serializable" to the
Node class and all the inner classes.
The serialization works fine but I can't deserialize the object.
I get the following null pointer exception:
java.lang.NullPointerException
at tud.inf.pi.sablecc.java2.node.TypedLinkedList.add(TypedLinkedList.java:51)
at java.util.LinkedList.readObject(LinkedList.java:687)
at java.lang.reflect.Method.invoke(Native Method)
at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2213)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1410)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2262)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2262)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2262)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
at tud.inf.pi.toolkit.scanner.Scanner.loadParseTree(Scanner.java:511)
at tud.inf.pi.toolkit.scanner.Scanner.run(Scanner.java:391)
at java.lang.Thread.run(Thread.java:484)
Because the serialization works, I don't know were to look for the error.
Any hints welcome,
Thomas
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Thomas Leonhardt email leonhardt@informatik.tu-darmstadt.de
TU Darmstadt WWW http://www.pi.informatik.tu-darmstadt.de
FG Praktische Informatik phone +49 / (0)6151 / 16 - 5313
D-64283 Darmstadt fax +49 / (0)6151 / 16 - 5472
Germany
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