Technology Cafe

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 [...]

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 [...]

The error message

Named query not known: my.simple.query
    [junit] org.hibernate.MappingException: Named query not known: relationship.delete_by_userId
    [junit]  at org.hibernate.impl.AbstractSessionImpl.getNamedQuery(AbstractSessionImpl.java:93)
    [junit]  at org.hibernate.impl.SessionImpl.getNamedQuery(SessionImpl.java:1287)

The context

You are using a named query in your application. Named queries are externalized and are coded in the hibernate mapping files rather than the application code

Possible reason(s) for this error

1) The name of the query in [...]