java.lang.IllegalArgumentException: opt is null

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java.lang.IllegalArgumentException: opt is null
at org.apache.commons.cli.Option.validateOption(Option.java:159)
at org.apache.commons.cli.Option.(Option.java:250)
at org.apache.openejb.cli.MainImpl.main(MainImpl.java:76)
at org.apache.maven.plugins.StartMojo.execute(StartMojo.java:43)

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