Calling close() multiple times on an ObjectOutputStream created by calling XStream.createObjectOutputStream(...) results in an ArrayIndexOutOfBoundsException. It should detect that it has already been closed and ignore the call.

Here's a test case that can be put in XStreamTest.java:


    public void testMultipleClose() {
     try {
StringWriter sout = new StringWriter();
ObjectOutputStream oout = xstream.createObjectOutputStream( sout );

oout.writeObject( new Integer( 1 ) );

oout.close();
oout.close();
     }
     catch( Exception ex ) {
ex.printStackTrace();
     fail( ex.toString() );
     }
    }

A patch for the fix is attached.