Hi Devs,
I'm trying to invoke a simple web service over UDP. I have properly
configured and exposed my service (SimpleStockQuoteService in Synapse) over
UDP transport and I use the following client to invoke the service:
public static void main(String[] args) throws Exception {
String request =
"<m0:getQuote xmlns:m0=\"http://services.samples\";>" +
"<m0:request>" +
"<m0:symbol>IBM</m0:symbol>" +
"</m0:request>" +
"</m0:getQuote>";
ConfigurationContext cfgCtx =
ConfigurationContextFactory.createConfigurationContextFromFileSystem(
CLIENT_HOME + "/client_repo",
CLIENT_HOME + "/client_repo/conf/axis2.xml");
ServiceClient client = new ServiceClient(cfgCtx, null);
client.engageModule("addressing");
Options options = new Options();
options.setTo(new
EndpointReference("udp://localhost:9999/services/SimpleStockQuoteService?contentType=text/xml"));
options.setAction("urn:getQuote");
client.setOptions(options);
OMElement res = client.sendReceive(AXIOMUtil.stringToOM(request));
System.out.println(res); // ***************************************
client.cleanup();
System.out.println("VALUE: " + parseStandardQuoteResponse(res));
}
public static String parseStandardQuoteResponse(OMElement result) throws
Exception {
AXIOMXPath xPath = new AXIOMXPath("//ns:last");
xPath.addNamespace("ns","http://services.samples/xsd";);
OMElement last = (OMElement) xPath.selectSingleNode(result);
if (last != null) {
return last.getText();
} else {
throw new Exception("Unexpected response : " + result);
}
}
I can see the client is receiving the correct response. The print statement
(marked with ********) gets executed and it prints the response payload as
expected:
<ns:getQuoteResponse xmlns:ns="http://services.samples";><ns:return
xmlns:ax21="http://services.samples/xsd"; xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance";
xsi:type="ax21:GetQuoteResponse"><ax21:change>-2.3994058702324095</ax21:change><ax21:earnings>-9.185768238192317</ax21:earnings><ax21:high>-158.13498398871758</ax21:high><ax21:last>158.5652017864806</ax21:last><ax21:lastTradeTimestamp>Sun
May 23 20:09:13 IST
2010</ax21:lastTradeTimestamp><ax21:low>-157.20036313216417</ax21:low><ax21:marketCap>5.393598252226892E7</ax21:marketCap><ax21:name>IBM
Company</ax21:name><ax21:open>165.6030739863106</ax21:open><ax21:peRatio>24.08910588357344</ax21:peRatio><ax21:percentageChange>1.5441539764455583</ax21:percentageChange><ax21:prevClose>-155.38643858273318</ax21:prevClose><ax21:symbol>IBM</ax21:symbol><ax21:volume>18163</ax21:volume></ns:return></ns:getQuoteResponse>
But then the parseStandardQuoteResponse method fails with the following
exception:
Exception in thread "main" org.apache.axiom.om.OMException:
com.ctc.wstx.exc.WstxUnexpectedCharException: Illegal character (NULL,
unicode 0) encountered: not valid in any content
at [row,col {unknown-source}]: [1,1234]
at
org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:267)
at
org.apache.axiom.om.impl.llom.OMDocumentImpl.buildNext(OMDocumentImpl.java:130)
at
org.apache.axiom.om.impl.llom.OMNodeImpl.getNextOMSibling(OMNodeImpl.java:122)
at
org.apache.axiom.om.impl.llom.OMElementImpl.getNextOMSibling(OMElementImpl.java:344)
at
org.apache.axiom.om.impl.traverse.OMChildrenIterator.next(OMChildrenIterator.java:102)
at
org.jaxen.util.DescendantAxisIterator.next(DescendantAxisIterator.java:127)
at org.jaxen.expr.DefaultStep.evaluate(DefaultStep.java:154)
at org.jaxen.expr.DefaultLocationPath.evaluate(DefaultLocationPath.java:140)
at
org.jaxen.expr.DefaultAbsoluteLocationPath.evaluate(DefaultAbsoluteLocationPath.java:113)
at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:102)
at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:674)
at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:213)
at org.jaxen.BaseXPath.selectSingleNode(BaseXPath.java:234)
at
org.wso2.test.tools.Axis2UDPClient.parseStandardQuoteResponse(Axis2UDPClient.java:63)
at org.wso2.test.tools.Axis2UDPClient.main(Axis2UDPClient.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
Caused by: com.ctc.wstx.exc.WstxUnexpectedCharException: Illegal character
(NULL, unicode 0) encountered: not valid in any content
at [row,col {unknown-source}]: [1,1234]
at
com.ctc.wstx.sr.StreamScanner.constructNullCharException(StreamScanner.java:615)
at com.ctc.wstx.sr.StreamScanner.throwInvalidSpace(StreamScanner.java:644)
at com.ctc.wstx.sr.StreamScanner.throwInvalidSpace(StreamScanner.java:635)
at
com.ctc.wstx.sr.BasicStreamReader.readSpacePrimary(BasicStreamReader.java:4914)
at
com.ctc.wstx.sr.BasicStreamReader.nextFromProlog(BasicStreamReader.java:2003)
at
com.ctc.wstx.sr.BasicStreamReader.nextFromTree(BasicStreamReader.java:2647)
at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1019)
at
org.apache.axiom.util.stax.wrapper.XMLStreamReaderWrapper.next(XMLStreamReaderWrapper.java:221)
at
org.apache.axiom.util.stax.dialect.DisallowDoctypeDeclStreamReaderWrapper.next(DisallowDoctypeDeclStreamReaderWrapper.java:33)
at
org.apache.axiom.util.stax.wrapper.XMLStreamReaderWrapper.next(XMLStreamReaderWrapper.java:221)
at
javax.xml.stream.util.StreamReaderDelegate.next(StreamReaderDelegate.java:60)
at
org.apache.axiom.om.impl.builder.SafeXMLStreamReader.next(SafeXMLStreamReader.java:221)
at
org.apache.axiom.om.impl.builder.StAXOMBuilder.parserNext(StAXOMBuilder.java:636)
at
org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:188)
... 19 more
The same exact code works fine with the HTTP transport. So I guess this has
something to do with the UDP transport. Any ideas?
Thanks,
Hiranya
--
Hiranya Jayathilaka
Senior Software Engineer;
WSO2 Inc.; http://wso2.org
E-mail: hira...@wso2.com; Mobile: +94 77 633 3491
Blog: http://techfeast-hiranya.blogspot.com
