Created attachment 542475 [details]
maven web app

Part of my spring configuration:

<drools:ksession id="statefulSession" type="stateful" kbase="kbase1">        
           <drools:workingMemoryEventListener>
               <bean class="org.drools.event.DebugWorkingMemoryEventListener"/>
           </drools:workingMemoryEventListener>
           <drools:processEventListener>
               <bean class="org.drools.event.DebugProcessEventListener"/>
           </drools:processEventListener>         
</drools:ksession>

throws :

Caused by: org.xml.sax.SAXParseException; lineNumber: 15; columnNumber: 41; cvc-complex-type.2.4.a: Invalid content was found starting with element 'drools:processEventListener'. One of '{"http://drools.org/schema/drools-spring":workingMemoryEventListener, "http://drools.org/schema/drools-spring":batch, "http://drools.org/schema/drools-spring":script, "http://drools.org/schema/drools-spring":configuration}' is expected.
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:387)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:321)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:421)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3186)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1810)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:709)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:376)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2732)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:819)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:748)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:239)
	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:288)
	at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:75)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:388)

But following configuration is OK:

<drools:ksession id="statefulSession" type="stateful" kbase="kbase1">        
           <drools:processEventListener>
               <bean class="org.drools.event.DebugProcessEventListener"/>
           </drools:processEventListener>         
</drools:ksession>

Also this configuration is OK:

<drools:ksession id="statefulSession" type="stateful" kbase="kbase1">        
           <drools:workingMemoryEventListener>
               <bean class="org.drools.event.DebugWorkingMemoryEventListener"/>
           </drools:workingMemoryEventListener>       
</drools:ksession>


Exception occurs only when both listeners are configured.

See attachment:
build as maven project, then deploy to tomcat. Exception occurs during deployment (see server log)