Strange error in classloader
----------------------------

                 Key: JRUBY-5887
                 URL: https://jira.codehaus.org/browse/JRUBY-5887
             Project: JRuby
          Issue Type: Bug
          Components: Interpreter
    Affects Versions: JRuby 1.6.2
         Environment: JRUBY in 1.9 mode
            Reporter: Arturas Slajus


{noformat}
Exception in thread "RubyThread-1: main.rb:4" [ads.teis.lt     0] Gathering...
[ads.teis.lt     0]   Spawning 1 threads.
java.lang.LinkageError: loader (instance of  org/jruby/util/JRubyClassLoader): 
attempted  duplicate class definition for name: "main$block_4$RUBY$__file__"
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at org.jruby.util.JRubyClassLoader.defineClass(JRubyClassLoader.java:76)
        at 
org.jruby.internal.runtime.methods.InvocationMethodFactory.endClassWithBytes(InvocationMethodFactory.java:1358)
        at 
org.jruby.internal.runtime.methods.InvocationMethodFactory.getBlockCallback19(InvocationMethodFactory.java:899)
        at 
org.jruby.javasupport.util.RuntimeHelpers.createBlockCallback19(RuntimeHelpers.java:177)
        at 
org.jruby.javasupport.util.RuntimeHelpers.createCompiledBlockBody19(RuntimeHelpers.java:292)
        at 
org.jruby.javasupport.util.RuntimeHelpers.createCompiledBlockBody19(RuntimeHelpers.java:282)
        at 
org.jruby.ast.executable.RuntimeCache.createBlockBody19(RuntimeCache.java:442)
        at 
org.jruby.ast.executable.RuntimeCache.getBlockBody19(RuntimeCache.java:85)
        at 
org.jruby.ast.executable.AbstractScript.getBlockBody192(AbstractScript.java:108)
        at main.block_3$RUBY$__file__(main.rb:39)
        at main$block_3$RUBY$__file__.call(main$block_3$RUBY$__file__:65535)
        at org.jruby.runtime.CompiledBlock19.yield(CompiledBlock19.java:154)
        at org.jruby.runtime.CompiledBlock19.call(CompiledBlock19.java:82)
        at org.jruby.runtime.Block.call(Block.java:89)
        at org.jruby.RubyProc.call(RubyProc.java:268)
        at org.jruby.RubyProc.call(RubyProc.java:232)
        at org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:95)
        at java.lang.Thread.run(Thread.java:662)
{/noformat}

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