>but a new one "java.io.OptionalDataException" arrives, i am sick abt
>this IOExceptions.
the JavaDoc says Exception indicating the failure of an object read
operation due to unread primitive data, or the end of data belonging
to a serialized object in the stream. This exception may be thrown in
two cases:
An attempt was made to read an object when the next element in the
stream is primitive data. In this case, the OptionalDataException's
length field is set to the number of bytes of primitive data
immediately readable from the stream, and the eof field is set to
false.
An attempt was made to read past the end of data consumable by a
class-defined readObject or readExternal method. In this case, the
OptionalDataException's eof field is set to true, and the length field
is set to 0.
This basically means your read did not match your write.

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Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.