Problem setting the grails proxy ?

Issue

If you are using grails on a windows box, you may face an issue while setting the grails proxy using the 'grails add-proxy' command. This is because of the way windows treats any paramters that you pass using the -- option and sets the host name and the port to boolean values.

JDBCException due to stale connections in Grails

Issue
If your grails application remains idle for too long or the database connections remain idle for too long or the database is restarted you may see the following exceptions:

ERROR org.hibernate.util.JDBCExceptionReporter - No more data to read from socket
ERROR org.hibernate.util.JDBCExceptionReporter - OALL8 is in an inconsistent state
ERROR org.hibernate.util.JDBCExceptionReporter - Io exception: Broken pipe
ERROR org.hibernate.util.JDBCExceptionReporter - Already closed.

These issues are intermittent, that is, they may disappear when you try hitting again.
This issue occurs because the application tries to use a database connection that has become stale and should have been evicted.

java.lang.NoClassDefFoundError when sending async emails in Grails

Issue
Exception while sending emails in production environment.

If you are trying to send emails from your application asynchronously, using the Mail plugin, in the production environment you may see an exception like:

java.lang.NoClassDefFoundError: org/springframework/mock/web/MockHttpServletRequest 

This is because of a bug in the Mail plugin. This plugin uses the MockHttpServletRequest class from the spring framework test jar which is not bundled when you run the 'grails prod war' command.