What is the -Dsun.lang.ClassLoader.allowArraySyntax=true option in JBoss?

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What is the -Dsun.lang.ClassLoader.allowArraySyntax=true option in JBoss? Why is it set by default in run.conf?

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Red Hat JBoss Enterprise Application Platform (EAP)
- 4.x
- 5.x
Red Hat JBoss SOA Platform (SOA-P)
- 4.3
- 5.x

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