No redeployment possible after unsuccessful first deployment

SourceForge Submitter: simongunz .
If deployment of ear fails (e.g. because of invalid
deployment descriptors) any further deployment of the
same (valid, since error corrected) archive fails with
the following exception:

org.jboss.deployment.DeploymentException: Error in
accessing application metadata: ; - nested throwable:
(javax.management.InstanceAlreadyExistsException:
jboss.j2ee:service=EARDeployment,url='jpi-jboss-iv.ear'
already registered.)

New deployment only succeeds after restarting JBoss.
Since this is very inconvenient this behaviour should
be changed so that deployment fails completely if there
is a mistake in the deployment descriptor.