Bouncy Castle PGP

I was testing some PGP methods from the Bouncy Castle API. When running their ClearSignedFileProcessor I got the following exception 

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 java.lang.SecurityException: JCE cannot authenticate the provider BC

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This page proved useful

However steps 1 and 2 are not necessary

1. Find java.security in /path_to_your_jvm/jre/lib/security
2. Add security.provider.9=org.bouncycastle.jce.provider.BouncyCastleProvider

if you instead explicitly add the Bouncy castle provider, (like is done in the example)

Security.addProvider(new BouncyCastleProvider());

Step 3 proved to be necessary. However, when I ran the program as part of a grails project... Strangely it wasnt' necessary. Not sure why that is