java.io.StreamCorruptedException: invalid stream header: 54657374

Clearly you aren’t sending the data with ObjectOutputStream: you are just writing the bytes.

  • If you read with readObject() you must write with writeObject().
  • If you read with readUTF() you must write with writeUTF().
  • If you read with readXXX() you must write with writeXXX(), for most values of XXX

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