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java.lang.ClassCastException: java.lang.Thread	at weblogic.servlet.internal.ResponseHeaders.setDateHeader(	at weblogic.servlet.internal.ServletResponseImpl.setDateHeader(	at weblogic.servlet.internal.ServletResponseImpl.writeHeaders(	at weblogic.servlet.internal.ServletOutputStreamImpl.flush(	at weblogic.servlet.internal.WLOutputStreamWriter.flush(	at	at org.apache.xalan.serialize.SerializerToXML.flushWriter(	at org.apache.xalan.serialize.SerializerToXML.endDocument(	at org.apache.xalan.transformer.ResultTreeHandler.endDocument(	at org.apache.xalan.transformer.TransformerImpl.transformNode(	at	at