WSO2 ESB 4.8.1中的XSLT转换错误

Question

I am performing a XSLT Transformation on an incoming Soap/http request in simple proxy service. I am getting the following Error.

Note: i am using WSO2 ESB 4.8.1.

Error:

Unable to perform XSLT transformation using : Value {name ='null', keyValue ='gov:/xslt/Interface.xslt'} against source XPath : s11:Body/child::*[position()=1] | s12:Body/child::*[position()=1] reason : Unable to create an OMElement using XSLT result  {org.apache.synapse.mediators.transform.XSLTMediator}
org.apache.synapse.SynapseException: Unable to create an OMElement using XSLT result 
    at org.apache.synapse.mediators.transform.XSLTMediator.performXSLT(XSLTMediator.java:302)
    at org.apache.synapse.mediators.transform.XSLTMediator.mediate(XSLTMediator.java:191)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:77)
    at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47)
    at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131)
    at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:166)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
    at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:411)
    at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:183)
    at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.axiom.om.OMException: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[4,16]
Message: Content is not allowed in prolog.
    at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
    at org.apache.axiom.om.impl.llom.OMDocumentImpl.getOMDocumentElement(OMDocumentImpl.java:109)
    at org.apache.axiom.om.impl.builder.StAXOMBuilder.getDocumentElement(StAXOMBuilder.java:570)
    at org.apache.axiom.om.impl.builder.StAXOMBuilder.getDocumentElement(StAXOMBuilder.java:566)
    at org.apache.synapse.util.jaxp.StreamResultBuilder.getNode(StreamResultBuilder.java:87)
    at org.apache.synapse.mediators.transform.XSLTMediator.performXSLT(XSLTMediator.java:300)
    ... 12 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[4,16]
Message: Content is not allowed in prolog.
    at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:598)
    at org.apache.axiom.util.stax.wrapper.XMLStreamReaderWrapper.next(XMLStreamReaderWrapper.java:225)
    at org.apache.axiom.util.stax.dialect.SJSXPStreamReaderWrapper.next(SJSXPStreamReaderWrapper.java:138)
    at org.apache.axiom.om.impl.builder.StAXOMBuilder.parserNext(StAXOMBuilder.java:681)
    at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:214)
    ... 17 more

XSLT File:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:con="http://com.example/cdm/contract/v1" xmlns:lic="http://com.example/cdm/license/v1" xmlns:org="http://com.example/cdm/organization/v1" xmlns:tns="http://com.example/cdm/order/v1" xmlns:tns1="http://com.example/cdm/customer/v1" xmlns:tns3="http://com.example/cdm/address/v1" xmlns:tns4="http://com.example/cdm/person/v1" xmlns:tns5="http://com.example/cdm/productoffer/v1" xmlns:tns6="http://com.example/cdm/product/v1" xmlns:tns7="http://com.example/cdm/productofferprice/v1" exclude-result-prefixes="tns tns1 tns4 tns3 tns5 tns6 tns7" version="1.0">
  <xsl:template match="/tns:OrderRequest">
    <tns:OrderRequest>
      <tns:Order>
        <tns:OrderHeader>
          <tns:OrderNumber>
            <xsl:value-of select="tns:OrderHeader/tns:OrderNumber" />
          </tns:OrderNumber>
            </tns:OrderHeader>
         </tns:Order>
    </tns:OrderRequest>
  </xsl:template>
</xsl:stylesheet>

Problem: i don't know what is wrong with my XSLT file. I don't see anything in my prolog.

Answer 1

The error indicates that the result of the transformation has non-whitespace text before the root element. The only explanation for this is that your template is never triggered and that only the default templates (which copy text nodes, but not elements) are applied. The would mean that the root element of the input of the transformation is not a tns:OrderRequest .

Answer 2

Looks like your configuration and the request payload has something to do with this error. Please provide your proxy service configuration and input xml payload to provide you with more insight.

Answer 3

如果你在错误中获得“无法使用XSLT结果创​​建OMElement”，则意味着你的模板/命名空间在xslt中与请求消息不匹配。请在这里查看开发者评论

Answer 4

This Error normally expected Payload is not formed to process by XSLT. Once you get this error, after all incoming payload fail to process whether if it is corrected payload.

Solution : Restart wso2esb after Changing Key value in Local entries and Proxy-services File.

Permanent Solution: Write Custom XSLT Mediator to solve this Problem