WSO2 ESB 4.8.1。获取 ERROR_DETAIL 消息的 Xpath 子字符串函数

Question

我在 wso2 esb 4.8.1 的 ERROR_DETAIL 属性中收到以下类型的消息。

留言：

<ErrorDetail>org.xml.sax.SAXParseException; cvc-type.3.1.3: The value '' of element 'ds1:HomecomingDate' is not valid.
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at org.apache.xerces.util.ErrorHandlerWrapper.error(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.xs.XMLSchemaValidator$XSIErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.reportSchemaError(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.elementLocallyValidType(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.processElementContent(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.handleEndElement(Unknown Source)
    at org.apache.xerces.impl.xs.XMLSchemaValidator.endElement(Unknown Source)
    at org.apache.xerces.jaxp.validation.ValidatorHandlerImpl.endElement(Unknown Source)
    at org.apache.axiom.om.impl.serialize.OMXMLReader.generateEvents(OMXMLReader.java:279)
    at org.apache.axiom.om.impl.serialize.OMXMLReader.generateEvents(OMXMLReader.java:251)
    at org.apache.axiom.om.impl.serialize.OMXMLReader.generateEvents(OMXMLReader.java:251)
    at org.apache.axiom.om.impl.serialize.OMXMLReader.generateEvents(OMXMLReader.java:251)
    at org.apache.axiom.om.impl.serialize.OMXMLReader.parse(OMXMLReader.java:171)
    at org.apache.axiom.om.impl.serialize.OMXMLReader.parse(OMXMLReader.java:161)
    at org.apache.xerces.jaxp.validation.ValidatorHandlerImpl.validate(Unknown Source)
    at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source)
    at javax.xml.validation.Validator.validate(Unknown Source)
    at org.apache.synapse.mediators.builtin.ValidateMediator.mediate(ValidateMediator.java:183)
    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.template.TemplateMediator.mediate(TemplateMediator.java:77)
    at org.apache.synapse.mediators.template.InvokeMediator.mediate(InvokeMediator.java:129)
    at org.apache.synapse.mediators.template.InvokeMediator.mediate(InvokeMediator.java:78)
    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.mediators.base.SequenceMediator.mediate(SequenceMediator.java:196)
    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)</ErrorDetail>

要检索的内容： 我想总是得到有意义的信息，就像在这种情况下：

The value '' of element 'ds1:HomecomingDate' is not valid.

每条消息的开头都包含以下行：

org.xml.sax.SAXParseException;

在每条消息中，堆栈跟踪都从这一行开始：

at org.apache.xerces.

所以我想在两者之间得到消息。我尝试使用以下属性调解器，但没有任何运气。

<property xmlns:ns2="http://org.apache.synapse/xsd" xmlns:ns="http://org.apache.synapse/xsd" name="DesiredValue" expression="fn:substring(get-property('ERROR_DETAIL'),1,fn:substring-before(get-property('ERROR_DETAIL'),"org.apache."))" scope="default" type="STRING"></property>

Answer 1

我们可以这样做

<property name="MSISDN" scope="default" type="STRING" value="94710000000"/>

<property expression="fn:substring($ctx:MSISDN, 3)"
              name="MSISDN_WITHOUT_COUNTRY_CODE" scope="default" type="STRING" xmlns:ns="http://org.apache.synapse/xsd"/>

输出将是 710000000

Answer 2

你能试试下面的属性吗：

<property xmlns:ns="http://org.apache.synapse/xsd" name="Cause" expression="get-property('ERROR_MESSAGE')"/>

<property xmlns:ns="http://org.apache.synapse/xsd" name="ERROR_CODE" expression="get-property('ERROR_CODE')"/>