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Actually the default provider class for Toplink was changed for 6.0, it should be oracle.toplink.essentials.PersistenceProvider . Please see http://www.netbeans.org/issues/show_bug.cgi?id=87704 , probably best would be to have both classes supported in the plugin.
Checking in OC4JJ2eePlatformImpl.java; /cvs/serverplugins/oc4j/src/org/netbeans/modules/j2ee/oc4j/ide/OC4JJ2eePlatformImpl.java,v <-- OC4JJ2eePlatformImpl.java new revision: 1.4; previous revision: 1.3 done