Here is something that should work:
<eip:xpath-predicate
xpath="java:test.DoubleMessageFilter.check(string(/header/value))"
namespaceContext="#nsContext">
<eip:functionResolver>
<bean class="org.apache.xalan.extensions.XPathFunctionResolverImpl" />
</eip:functionResolver>
</eip:xpath-predicate>
<eip:namespace-context id="nsContext">
<eip:namespaces>
<eip:namespace
prefix="java">http://xml.apache.org/xalan/java</eip:namespace>
</eip:namespaces>
</eip:namespace-context>
There may be better ways to do that, but this one works at least.
On 12/14/06, frankr <[EMAIL PROTECTED]> wrote:
gnodet wrote:
>
> You should be able to do that by setting a FunctionResolver on the
> xpath expression:
>
> <eip:xpath-predicate xpath="filter:check(string(/header/value))"
> namespaceContext="#nsContext">
> <eip:functionResolver>
> <bean class="org.apache.xalan.extensions.XPathFunctionResolverImpl"
> />
> </eip:functionResolver>
> </eip:xpath-predicate>
>
> Then you should be able to use xalan java extensions as advertised at
> http://xml.apache.org/xalan-j/extensions.html.
> Though I have never tried ...
> Please report back any success or issue.
>
>
Unfortunately the NPE is still there. The ExtensionsProvider cannot be
retrieved from the XPathContext. The call getOwnerObject() in
FuncExtFunction returns null. Did I overlook something?
On 12/13/06, frankr <[EMAIL PROTECTED]> wrote:
>
> Is it possible to use a Java method extension function as EIP filter XPath
> predicate?
>
> I'm trying to implement the EIP filter pattern using a Java extension
> function. The function does a check and either returns true or false based
> on which the message is filtered out.
>
> On arrival of messages I get the following NPE:
>
>
> javax.jbi.messaging.MessagingException:
> javax.xml.xpath.XPathExpressionException:
> javax.xml.transform.TransformerException: Unknown error in XPath.
> at
>
org.apache.servicemix.expression.JAXPXPathExpression.evaluate(JAXPXPathExpression.java:104)
> at
>
org.apache.servicemix.eip.support.XPathPredicate.matches(XPathPredicate.java:49)
> at
>
org.apache.servicemix.eip.patterns.MessageFilter.processAsync(MessageFilter.java:185)
> at
> org.apache.servicemix.eip.EIPEndpoint.process(EIPEndpoint.java:241)
> at
>
org.apache.servicemix.common.AsyncBaseLifeCycle.processExchange(AsyncBaseLifeCycle.java:410)
> at
>
org.apache.servicemix.common.BaseLifeCycle.onMessageExchange(BaseLifeCycle.java:43)
> at
>
org.apache.servicemix.jbi.messaging.DeliveryChannelImpl.processInBound(DeliveryChannelImpl.java:624)
> at
>
org.apache.servicemix.jbi.nmr.flow.AbstractFlow.doRouting(AbstractFlow.java:169)
> at
> org.apache.servicemix.jbi.nmr.flow.seda.SedaFlow.doRouting(SedaFlow.java:177)
> at
> org.apache.servicemix.jbi.nmr.flow.seda.SedaQueue$1.run(SedaQueue.java:227)
> at
> org.apache.geronimo.connector.work.WorkerContext.run(WorkerContext.java:291)
> at
>
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
> at java.lang.Thread.run(Thread.java:595)
> Caused by: javax.xml.xpath.XPathExpressionException:
> javax.xml.transform.TransformerException: Unknown error in XPath.
> at
>
org.apache.xpath.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:191)
> at
>
org.apache.servicemix.expression.JAXPBooleanXPathExpression.evaluateXPath(JAXPBooleanXPathExpression.java:37)
> at
>
org.apache.servicemix.expression.JAXPXPathExpression.evaluate(JAXPXPathExpression.java:97)
> ... 12 more
> Caused by: javax.xml.transform.TransformerException: Unknown error in
> XPath.
> at org.apache.xpath.XPath.execute(XPath.java:363)
> at org.apache.xpath.XPath.execute(XPath.java:301)
> at
> org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:123)
> at
> org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:97)
> at
>
org.apache.xpath.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:178)
> ... 14 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:206)
> at org.apache.xpath.XPath.execute(XPath.java:335)
> ... 18 more
>
>
> My filter is configured as follows:
>
>
> <?xml version="1.0" encoding="UTF-8"?>
> <beans xmlns:eip="http://servicemix.apache.org/eip/1.0";
> xmlns:ci="http://test/test";>
>
> <eip:message-filter
> service="ci:core-inbound-double-message-filter"
> endpoint="endpoint">
> <eip:target>
> <eip:exchange-target
>
> service="ci:core-inbound-enhancer-pipeline" />
> </eip:target>
> <eip:filter>
> <eip:xpath-predicate
>
> xpath="filter:check(string(/header/value))"
> namespaceContext="#nsContext" />
> </eip:filter>
> </eip:message-filter>
>
> <eip:namespace-context id="nsContext">
> <eip:namespaces>
> <eip:namespace
> prefix="filter">java:test.DoubleMessageFilter</eip:namespace>
> </eip:namespaces>
> </eip:namespace-context>
>
> </beans>
>
> The DoubleMessageFilter class is available on the classpath and has a
> static
> check method which returns a boolean value.
>
> Is it possible what I'm trying to achieve or do I need a different
> approach?
> Input appreciated.
>
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Guillaume Nodet
