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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