问题
I am trying to call a web service but facing a strange behavior. we have a web-service running on my server but the code is not open to us so can not see what going on behind the wall The owner of the service have exposed web based test client UI which take input in a text box and will show the response to testing purpose.This input box is taking the input in the below mentioned format
<CONTENT>
<CONTENTID></CONTENTID>
<DOCUMENTID>DRI2</DOCUMENTID>
<LOCALECODE>en_US</LOCALECODE>
<LATEST_VERSION>false</LATEST_VERSION>
<INCREASEVIEWCOUNT>false</INCREASEVIEWCOUNT>
<ACTIVITY_TYPE></ACTIVITY_TYPE>
</CONTENT>
its working fine on this UI but when i am trying to call this web service through my java code its getting connected as well getting authorized by the service but when i trying to call the above method it giving me the below error message
AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: org.xml.sax.SAXParseException: Content is not allowed in prolog.
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}stackTrace:org.xml.sax.SAXParseException: Content is not allowed in prolog.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$PrologDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
at org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:435)
at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:206)
at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
at com.inquira.imwows.generated.ContentServicesSoapBindingStub.getContentRecord(ContentServicesSoapBindingStub.java:262)
at com.inquira.prep.GetWebService.getcontentRecord(GetWebService.java:87)
at com.inquira.prep.TestWs.main(TestWs.java:13)
{http://xml.apache.org/axis/}hostname:umeshawasthi
org.xml.sax.SAXParseException: Content is not allowed in prolog.
at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:701)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:435)
at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:206)
at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
at com.inquira.imwows.generated.ContentServicesSoapBindingStub.getContentRecord(ContentServicesSoapBindingStub.java:262)
at com.inquira.prep.GetWebService.getcontentRecord(GetWebService.java:87)
at com.inquira.prep.TestWs.main(TestWs.java:13)
Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$PrologDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
at org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696)
... 11 more
below is the code for generating the required XML
inputXml.append(\"<CONTENT>\");
inputXml.append(\"<CONTENTID>\").append(\"</CONTENTID>\");
inputXml.append(\"<DOCUMENTID>\").append(\"DRI2\").append(\"</DOCUMENTID>\");
inputXml.append(\"<LOCALECODE>\").append(\"en_US\").append(\"</LOCALECODE>\");
inputXml.append(\"<LATEST_VERSION>\").append(\"false\").append(\"</LATEST_VERSION>\");
inputXml.append(\"<INCREASEVIEWCOUNT>\").append(\"false\").append(\"</INCREASEVIEWCOUNT>\");
inputXml.append(\"<ACTIVITY_TYPE>\").append(\"</ACTIVITY_TYPE>\");
inputXml.append(\"</CONTENT>\");
and the generated XML is as below
<CONTENT><CONTENTID></CONTENTID><DOCUMENTID>DRI2</DOCUMENTID><LOCALECODE>en_US</LOCALECODE><LATEST_VERSION>false</LATEST_VERSION><INCREASEVIEWCOUNT>false</INCREASEVIEWCOUNT><ACTIVITY_TYPE></ACTIVITY_TYPE></CONTENT>
i even did timing of the generated string something as below
inputXml.toString().trim().replaceFirst(\"^([\\\\W]+)<\",\"<\");
but unable to find out whats going wrong,one thing i am sure there is some problem in the input XML as its working find on the test Page UI for the same XML
any help in this regard is much appricated
回答1:
This error is probably related to a byte order mark (BOM) prior to the actual XML content. You need to parse the returned String and discard the BOM, so SAXParser can process the document correctly.
You will find a possible solution here.
回答2:
to simply remove it, paste your xml file into notepad, you'll see the extra character before the first tag. Remove it & paste back into your file - bof
回答3:
Check the XML. It is not a valid xml.
Prolog is the first line with xml version info. It ok not to include it in your xml.
This error is thrown when the parser reads an invalid tag at the start of the document. Normally where the prolog resides.
e.g.
- Root/><document>
- Root<document>
回答4:
This error can come if there is validation error either in your wsdl or xsd file. For instance I too got the same issue while running wsdl2java to convert my wsdl file to generate the client. In one of my xsd it was defined as below
<xs:import schemaLocation="" namespace="http://MultiChoice.PaymentService/DataContracts" />
Where the schemaLocation was empty. By providing the proper data in schemaLocation resolved my problem.
<xs:import schemaLocation="multichoice.paymentservice.DataContracts.xsd" namespace="http://MultiChoice.PaymentService/DataContracts" />
回答5:
I faced the same issue. Our application running on four application servers and due to invalid schema location mentioned on one of the web service WSDL, hung threads are generated on the servers . The appliucations got down frequently. After corrected the schema Location , the issue got resolved.
来源：https://stackoverflow.com/questions/4569123/content-is-not-allowed-in-prolog-saxparserexception