Error when using XPath 2.0 in Integrator Studio 8.2.0

[TomasWso2]

Description

We were able to reproduce this issue in Integrator Studio 8.2.0 for Windows and Linux.
We tried the same in the latest update level of wso2mi-4.2.0 and it works.

Error stack trace:

[2023-11-02 15:40:26,998] ERROR {org.apache.synapse.util.xpath.SynapseXPath} - Evaluation of the XPath expression fn:replace("abracadabra", "bra", "*") resulted in an error
javax.xml.transform.TransformerException: java.lang.NullPointerException
at java.xml/com.sun.org.apache.xpath.internal.jaxp.JAXPExtensionsProvider.extFunction(JAXPExtensionsProvider.java:205)
at java.xml/com.sun.org.apache.xpath.internal.functions.FuncExtFunction.execute(FuncExtFunction.java:210)
at java.xml/com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:339)
at java.xml/com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:305)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathImplUtil.eval(XPathImplUtil.java:101)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:80)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:89)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:111)
at org.apache.synapse.util.xpath.SynapseXPath.evaluateDOMXPath(SynapseXPath.java:677)
at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf(SynapseXPath.java:510)
at org.apache.synapse.mediators.MediatorProperty.getEvaluatedExpression(MediatorProperty.java:144)
at org.apache.synapse.mediators.builtin.LogMediator.setCustomProperties(LogMediator.java:236)
at org.apache.synapse.mediators.builtin.LogMediator.getCustomLogMessage(LogMediator.java:153)
at org.apache.synapse.mediators.builtin.LogMediator.getLogMessage(LogMediator.java:139)
at org.apache.synapse.mediators.builtin.LogMediator.mediate(LogMediator.java:108)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:110)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:72)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.api.Resource.process(Resource.java:342)
at org.apache.synapse.api.API.process(API.java:477)
at org.apache.synapse.api.AbstractApiHandler.apiProcess(AbstractApiHandler.java:94)
at org.apache.synapse.api.AbstractApiHandler.dispatchToAPI(AbstractApiHandler.java:72)
at org.apache.synapse.api.rest.RestRequestHandler.dispatchToAPI(RestRequestHandler.java:90)
at org.apache.synapse.api.rest.RestRequestHandler.process(RestRequestHandler.java:76)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:54)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:346)
at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:101)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:379)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:193)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NullPointerException
at java.xml/com.sun.org.apache.xpath.internal.jaxp.JAXPExtensionsProvider.extFunction(JAXPExtensionsProvider.java:198)
... 33 more

---

java.lang.NullPointerException
at java.xml/com.sun.org.apache.xpath.internal.jaxp.JAXPExtensionsProvider.extFunction(JAXPExtensionsProvider.java:198)
at java.xml/com.sun.org.apache.xpath.internal.functions.FuncExtFunction.execute(FuncExtFunction.java:210)
at java.xml/com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:339)
at java.xml/com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:305)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathImplUtil.eval(XPathImplUtil.java:101)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:80)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:89)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:111)
at org.apache.synapse.util.xpath.SynapseXPath.evaluateDOMXPath(SynapseXPath.java:677)
at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf(SynapseXPath.java:510)
at org.apache.synapse.mediators.MediatorProperty.getEvaluatedExpression(MediatorProperty.java:144)
at org.apache.synapse.mediators.builtin.LogMediator.setCustomProperties(LogMediator.java:236)
at org.apache.synapse.mediators.builtin.LogMediator.getCustomLogMessage(LogMediator.java:153)
at org.apache.synapse.mediators.builtin.LogMediator.getLogMessage(LogMediator.java:139)
at org.apache.synapse.mediators.builtin.LogMediator.mediate(LogMediator.java:108)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:110)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:72)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.api.Resource.process(Resource.java:342)
at org.apache.synapse.api.API.process(API.java:477)
at org.apache.synapse.api.AbstractApiHandler.apiProcess(AbstractApiHandler.java:94)
at org.apache.synapse.api.AbstractApiHandler.dispatchToAPI(AbstractApiHandler.java:72)
at org.apache.synapse.api.rest.RestRequestHandler.dispatchToAPI(RestRequestHandler.java:90)
at org.apache.synapse.api.rest.RestRequestHandler.process(RestRequestHandler.java:76)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:54)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:346)
at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:101)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:379)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:193)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
--------------- linked to ------------------
javax.xml.xpath.XPathExpressionException: javax.xml.transform.TransformerException: java.lang.NullPointerException
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:102)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:111)
at org.apache.synapse.util.xpath.SynapseXPath.evaluateDOMXPath(SynapseXPath.java:677)
at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf(SynapseXPath.java:510)
at org.apache.synapse.mediators.MediatorProperty.getEvaluatedExpression(MediatorProperty.java:144)
at org.apache.synapse.mediators.builtin.LogMediator.setCustomProperties(LogMediator.java:236)
at org.apache.synapse.mediators.builtin.LogMediator.getCustomLogMessage(LogMediator.java:153)
at org.apache.synapse.mediators.builtin.LogMediator.getLogMessage(LogMediator.java:139)
at org.apache.synapse.mediators.builtin.LogMediator.mediate(LogMediator.java:108)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:110)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:72)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.api.Resource.process(Resource.java:342)
at org.apache.synapse.api.API.process(API.java:477)
at org.apache.synapse.api.AbstractApiHandler.apiProcess(AbstractApiHandler.java:94)
at org.apache.synapse.api.AbstractApiHandler.dispatchToAPI(AbstractApiHandler.java:72)
at org.apache.synapse.api.rest.RestRequestHandler.dispatchToAPI(RestRequestHandler.java:90)
at org.apache.synapse.api.rest.RestRequestHandler.process(RestRequestHandler.java:76)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:54)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:346)
at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:101)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:379)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:193)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: javax.xml.transform.TransformerException: java.lang.NullPointerException
at java.xml/com.sun.org.apache.xpath.internal.jaxp.JAXPExtensionsProvider.extFunction(JAXPExtensionsProvider.java:205)
at java.xml/com.sun.org.apache.xpath.internal.functions.FuncExtFunction.execute(FuncExtFunction.java:210)
at java.xml/com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:339)
at java.xml/com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:305)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathImplUtil.eval(XPathImplUtil.java:101)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:80)
at java.xml/com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:89)
... 27 more
Caused by: java.lang.NullPointerException
at java.xml/com.sun.org.apache.xpath.internal.jaxp.JAXPExtensionsProvider.extFunction(JAXPExtensionsProvider.java:198)
... 33 more

Steps to Reproduce

Steps:

1. Create an API which uses XPATH functions.
   example:

<?xml version="1.0" encoding="UTF-8"?>
<api context="/test" name="Test" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="GET">
        <inSequence>
            <log level="custom">
                <property expression="fn:replace(&quot;abracadabra&quot;, &quot;bra&quot;, &quot;*&quot;)" name="tags" xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:ns="http://org.apache.synapse/xsd"/>
            </log>
            <respond/>
        </inSequence>
        <outSequence/>
        <faultSequence/>
    </resource>
</api>

2. Run with the enbedded MI server.
3. Add the following config to the emedded deployment.toml and save.
   [mediation]
   synapse.enable_xpath_dom_failover=true
4. Invoke the API.

Affected Component

IntegrationStudio

Version

8.2.0

Environment Details (with versions)

No response

Relevant Log Output

No response

Related Issues

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Suggested Labels

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