I just tried and an application can't be loaded if it has a PU with a non-registered datasource:
com.sun.enterprise.deployment.backend.IASDeploymentException: Error while loading application [ex1-ee]. Please refer to the server log for more details.
and in the log:
[#|2007-10-08T17:46:20.237-0700|WARNING|sun-appserver9.1|javax.enterprise.system.core.classloading|_ThreadID=14;_ThreadNa
me=httpWorkerThread-4848-1;_RequestID=a445fefc-26cb-43eb-b10c-358edb13a014;|javax.naming.NameNotFoundException: oracle no
t found
java.lang.RuntimeException: javax.naming.NameNotFoundException: oracle not found
at com.sun.enterprise.server.PersistenceUnitInfoImpl._getJtaDataSource(PersistenceUnitInfoImpl.java:283)
at com.sun.enterprise.server.PersistenceUnitInfoImpl.<init>(PersistenceUnitInfoImpl.java:116)
at com.sun.enterprise.server.PersistenceUnitLoaderImpl.load(PersistenceUnitLoaderImpl.java:121)
at com.sun.enterprise.server.PersistenceUnitLoaderImpl.load(PersistenceUnitLoaderImpl.java:84)
at com.sun.enterprise.server.AbstractLoader.loadPersistenceUnits(AbstractLoader.java:898)
at com.sun.enterprise.server.ApplicationLoader.doLoad(ApplicationLoader.java:184)
at com.sun.enterprise.server.TomcatApplicationLoader.doLoad(TomcatApplicationLoader.java:126)
at com.sun.enterprise.server.AbstractLoader.load(AbstractLoader.java:244)
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