filter jms message with xquery, using apache camel wildfly - apache-camel

Question

I have problem to use xquery on a JMS message using apache camel and
wildfly.
My code reads from an jms queue and try to filter the message
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.cdi.ContextName;
import org.apache.camel.component.jms.JmsComponent;
import org.wildfly.extension.camel.CamelAware;
import javax.annotation.Resource;
import javax.ejb.Startup;
import javax.enterprise.context.ApplicationScoped;
import javax.jms.ConnectionFactory;
#Startup
#CamelAware
#ApplicationScoped
#ContextName("test")
class MyRouteBuilder extends RouteBuilder {
#Resource(mappedName = "java:jboss/DefaultJMSConnectionFactory")
private ConnectionFactory connectionFactory;
#Override
public void configure() throws Exception {
getContext().addComponent("jms", JmsComponent.jmsComponentAutoAcknowledge(connectionFactory));
from("jms:queue:test1").
routeId("test").
to("log:jms?showAll=true").
filter().xquery("fn:contains(//person/name/text(),'james')").
to("file://Users/asse/Outbound");
When I run the code with the message
<person><name>james</name><person> I get the error:
Message History
--------------------------------------------------------------------------------------------------------------------------------------- RouteId ProcessorId Processor
Elapsed (ms) [test ] [test ]
[jms://queue:test1
] [ 5] [test ] [to7 ]
[log:jms?showAll=true
] [ 1] [test ] [filter7 ]
[filter[xquery{XQuery[net.sf.saxon.query.XQueryExpression#3af367ad]}]
] [ 2]
Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------: org.apache.camel.RuntimeExpressionException:
java.lang.NullPointerException: External object cannot wrap a Java
null at
org.apache.camel.component.xquery.XQueryBuilder.matches(XQueryBuilder.java:220)
at
org.apache.camel.processor.FilterProcessor.matches(FilterProcessor.java:65)
at
org.apache.camel.processor.FilterProcessor.process(FilterProcessor.java:51)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
at
org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:542)
at
org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197)
I don't understand why! Can anyone help me with this problem??

Answer 1

Encountered the same issue with standalone camel 2.18.1.
I believe this is a bug in camel caused by upgrading to Saxon version 9.7.0, which no longer allows null values to be put into query context
The bug is in class org.apache.camel.component.xquery.XQueryBuilder. It attempt to add all Exchange headers and properties to query execution context in method org.apache.camel.component.xquery.XQueryBuilder#configureQuery. If any of the headers or properties have null values (and in case of JMS message there will be lots of headers), an exception is thrown.
I was able to reproduce the issue and it seems it is not the only problem with xquery in camel 2.18
I've logged a jira issue https://issues.apache.org/jira/browse/CAMEL-10653