Github user jochenberger commented on a diff in the pull request:

    https://github.com/apache/groovy/pull/445#discussion_r82783539
  
    --- Diff: src/main/groovy/lang/GroovyClassLoader.java ---
    @@ -969,13 +970,24 @@ public Void run() {
          */
         public void clearCache() {
             synchronized (classCache) {
    +            for (Class cl : classCache.values()) {
    +                InvokerHelper.removeClass(cl);
    +            }
                 classCache.clear();
             }
             synchronized (sourceCache) {
                 sourceCache.clear();
             }
         }
     
    +    @Override
    +    public void close() throws IOException {
    +        super.close();
    +        for (Class cl : classCache.values()) {
    --- End diff --
    
    I thought that synchronization might not be an issue since we are 
`close`-ing the ClassLoader anyway and I wanted to avoid the additional cost of 
synchronizing over and clearing `sourceCache`. But I guess it's better safe 
than sorry, so I made the change.


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