Ruby-Processing and java.lang.ExceptionInInitializerError

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1. rp5 run samples/jwishy.rb   
2. RubyGlobal.java:135:in `createGlobals': java.lang.ExceptionInInitializerError  
3.     from Ruby.java:939:in `init'  
4.     from Ruby.java:172:in `newInstance'  
5.     from Main.java:199:in `run'  
6.     from Main.java:110:in `run'  
7.     from Main.java:94:in `main'  

rp5 run samples/jwishy.rb 
RubyGlobal.java:135:in `createGlobals': java.lang.ExceptionInInitializerError
    from Ruby.java:939:in `init'
    from Ruby.java:172:in `newInstance'
    from Main.java:199:in `run'
    from Main.java:110:in `run'
    from Main.java:94:in `main'

... the culprit was the alternative version of the JRE I was using (OpenJDK). After swtiching to the standard Sun JDK everything worked fine.