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java.util.ConcurrentModificationException: 	at java.util.TreeMap$EntryIterator.nextEntry(TreeMap.java:1022)	at java.util.TreeMap$KeyIterator.next(TreeMap.java:1047)	at com.solarmetric.kodo.meta.ClassMetaData.finish(ClassMetaData.java:276)	at com.solarmetric.kodo.meta.ClassMetaData.newInstance(ClassMetaData.java:207)	at com.solarmetric.kodo.meta.ClassMetaData.getInstance(ClassMetaData.java:145)	at com.solarmetric.kodo.enhance.JDOEnhancer.(JDOEnhancer.java:204)	at com.solarmetric.kodo.enhance.JDOEnhancer.enhance(JDOEnhancer.java:147)	at com.solarmetric.kodo.enhance.JDOEnhancer.main(JDOEnhancer.java:108)