TOTD #90: Migrating from Wicket 1.3.x to 1.4 - "Couldn't load DiskPageStore index from file" error

Now that Apache Wicket 1.4 is available, migrating from previous versions is pretty straight forward.

Change the version in your POM file as:

<wicket.version>1.4.0</wicket.version>

And that's it!

The complete dependency may look like:

<dependency>   <groupId>org.apache.wicket</groupId>   <artifactId>wicket</artifactId>   <version>1.4.0</version> </dependency>

or

<dependency>   <groupId>org.apache.wicket</groupId>   <artifactId>wicket</artifactId>   <version>${wicket.version}</version> </dependency>

You may encounter the following error:

2009-08-05 05:58:49.387::INFO:  No Transaction manager found - if your webapp requires one, please configure one. ERROR - DiskPageStore              - Couldn't load DiskPageStore index from file /Users/arungupta/workspaces/runner~subversion/wicket/runner/target/work/wicket.runner-filestore/DiskPageStoreIndex. java.lang.ClassNotFoundException: org.apache.wicket.util.concurrent.ConcurrentHashMap         at java.net.URLClassLoader$1.run(URLClassLoader.java:200)         at java.security.AccessController.doPrivileged(Native Method)         at java.net.URLClassLoader.findClass(URLClassLoader.java:188)         at java.lang.ClassLoader.loadClass(ClassLoader.java:319)

At least I did :)

Fortunately the fix is simple and intuitive. Instead of running "mvn jetty:run", invoke the command:

mvn clean jetty:run

Basically, "clean" will clean out references to older version of Wicket jars in your project and voila!

If you are deploying as WAR file, then bundle Wicket jars in WEB-INF/lib instead of copying them to the shared folder of your application server.

Other Wicket tips on this blog are available here. Specifically TOTD #86 shows how to get started with Apache Wicket on GlassFish.

Please leave suggestions on other TOTD (Tip Of The Day) that you'd like to see. A complete archive of all the tips is available here.

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