[TILES-561] java.lang.NullPointerException at org.apache.tiles.el.JspExpressionFactoryFactory.getExpressionFactory

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 2.2.2
• Component/s: tiles-extras
• Labels: maven

Environment

win 7, IntelliJ latest, embeded tomcat7, struts2 2.3.4.1, tiles 2.2.2, maven

• Assignee: Unassigned
• Reporter: Pirzada Rashid
• Created: 30/Oct/12 23:10
• Updated: 19/Aug/16 10:16
• Resolved: 02/Dec/12 22:56

Description

Demo project is attached but problem is throughly discussed at http://stackoverflow.com/questions/13126201/struts2-tiles-org-apache-tiles-extras-complete-completeautoloadtileslistener-int . Seems there is no solution to it because I have spent hrs struggling.

In Short:

web.xml
<listener>
<listener-class>org.apache.tiles.extras.complete.CompleteAutoloadTilesListener</listener-class>
</listener>

generating error

SEVERE: Exception sending context initialized event to listener instance of class org.apache.tiles.extras.complete.CompleteAutoloadTilesListener
java.lang.NullPointerException
at org.apache.tiles.el.JspExpressionFactoryFactory.getExpressionFactory(JspExpressionFactoryFactory.java:61)
at org.apache.tiles.extras.complete.CompleteAutoloadTilesContainerFactory.createELEvaluator(CompleteAutoloadTilesContainerFactory.java:242)
at org.apache.tiles.extras.complete.CompleteAutoloadTilesContainerFactory.createAttributeEvaluatorFactory(CompleteAutoloadTilesContainerFactory.java:182)
at org.apache.tiles.factory.BasicTilesContainerFactory.createContainer(BasicTilesContainerFactory.java:88)

Conclusion
After alot of testing and checking, the problem is with embedded tomcat7 instance which is not working with the above web.xml configuration and genertating error. Below is the pom plugin that if run tomcat7:run will generate the error

<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.0</version>
<configuration>
<port>8000</port>
</configuration>
</plugin>