Is axis client thread safe?(with patch)

[Takashi Okamoto]

Hi, axis.   Is Axis(beta2) Client thread safe? How can I use AxisClient in multi-thread? I have a problem that SOAPBodyElement is broken by executing Call.invoke() under multi-thread environment. It seems not to resolve recent cvs snapshots. Here is message:   java.lang.NullPointerException  at org.apache.xerces.dom.ParentNode.nodeListGetLength(ParentNode.java:739)  at org.apache.xerces.dom.ParentNode.getLength(ParentNode.java:751)  at org.apache.axis.encoding.SerializationContextImpl.writeDOMElement(SerializationContextImpl.java:913)  at org.apache.axis.message.MessageElement.outputImpl(MessageElement.java:661)  at org.apache.axis.message.MessageElement.output(MessageElement.java:651)  at org.apache.axis.message.SOAPEnvelope.outputImpl(SOAPEnvelope.java:382)  at org.apache.axis.message.MessageElement.output(MessageElement.java:651)  at org.apache.axis.SOAPPart.getAsString(SOAPPart.java:379)  at org.apache.axis.SOAPPart.getAsBytes(SOAPPart.java:306)  at org.apache.axis.Message.getContentLength(Message.java:334)  at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:382)  at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:71)  at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:154)  at org.apache.axis.SimpleChain.invoke(SimpleChain.java:121)  at org.apache.axis.client.AxisClient.invoke(AxisClient.java:174)  at org.apache.axis.client.Call.invoke(Call.java:1905)  at org.apache.axis.client.Call.invoke(Call.java:1155)   I haven't resolved it completely but at least, I doubt dbf(DocumentBuilder) and saxFactory(SAXParserFactory) at XMLUtils.java is thread unsafe by following description:   http://xml.apache.org/xalan-j/apidocs/javax/xml/parsers/SAXParserFactory.html > An implementation of the SAXParserFactory class is NOT guaranteed to > be thread safe.   http://xml.apache.org/xalan-j/apidocs/javax/xml/parsers/DocumentBuilder.html > An implementation of the DocumentBuilderFactory class is NOT > guaranteed to be thread safe.   I attached a patch for it.   regards,   Takashi Okamoto   [EMAIL PROTECTED] NTTDATA Coop. R&D Headquarters   --- XMLUtils.java.orig  2002-06-11 17:17:12.000000000 +0900 +++ XMLUtils.java       2002-06-11 17:20:32.000000000 +0900 @@ -193,7 +193,9 @@                   return (SAXParser )saxParsers.pop();           }          try { +           synchronized (saxFactory) {                  return saxFactory.newSAXParser(); +           }            } catch (ParserConfigurationException e) {              log.error(JavaUtils.getMessage("parserConfigurationException00"), e ); @@ -230,7 +232,9 @@        public static Document newDocument() {          try { -            return dbf.newDocumentBuilder().newDocument(); +            synchronized (dbf) { +                return dbf.newDocumentBuilder().newDocument(); +            }          } catch (Exception e) {              return null;          } @@ -238,7 +242,9 @@        public static Document newDocument(InputSource inp) {          try { -            DocumentBuilder db = dbf.newDocumentBuilder(); +            synchronized (dbf) { +               DocumentBuilder db = dbf.newDocumentBuilder(); +            }              db.setErrorHandler( new ParserErrorHandler() );              return( db.parse( inp ) );          }