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You can check if JDeveloper sees the new dependencies in Applications tab, by expanding 'library' icons. The jar files should reveal full content. If you do not see jar files structure check .jpr file for proper library URLs. For example, with targetID
oracle and artifactId ojdbc, the plugin assumed that ojdbc14.jar file is in .maven/repository/ojdbc/jars, contrary to the
definition of targetId as being the directory in repository.
Note: Maven 1.0 plugin is not supported anymore, and I have not seen a new version for Maven 2.0 out there.