The context
I am using Google App Engine using the Grails AppEngine plugin . The default port is 8080, but I needed to run it on a different port.
It was easy to figure out that Google App Engine supports running the development server on any configured port. But it took me some time to realize that the Grails AppEngine plugin that I am using doesn’t.
The fix:
Modify the \plugins\app-engine-0.8.5\scripts\AppEngine.groovy.
The context:
I am using Google App Engine along with Grails AppEngine plugin. At some point I started getting an exception when I was trying to start my development server. The only thing I had done before I got the error was- I had switched from App Engine SDK 1.2.5 to 1.2.8.
The solution
The problem is that the Grails clean command doesnt do a very good job of cleaning the cache folder when the App engine is installed.
The solution was to simply delete the cache folder created by cache and presto ! all was well again
Context:
JSF application running on a Tomcat server
Symptoms:
When you try to access a resource in your appplication- you are greeted with a 404 error
Investigation
Check your error log.
If your exception trace is similar to one of the exceptions mentioned below mentioned below- you are missing one or both of these libraries: Commons-Digester or Commons- BeanUtils. (Note: You need both since Digister is dependent upon BeanUtils.)
SEVERE: Error configuring application listener of class com.sun.faces.config.ConfigureListener
java.lang.NoClassDefFoundError: org.apache.commons.digester.RuleSet
OR
SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener
java.lang.NoClassDefFoundError: org.apache.commons.beanutils.MethodUtils
Resolution
Download Digister from here http://commons.apache.org/digester/
and BeanUtils from here http://commons.apache.org/beanutils/
You will need to put these libraries under the WEB-INF\lib folder of your application.
PS: If this fixes your problem – please leave a note here or if it doesn’t let me know either way
Good luck !!!
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