Oracle Endeca 3.x : Concurrent Modification Exception Thrown From Assembler API

Sometimes Assembler API shows following exceptions:-

java.util.ConcurrentModificationException
  at com.endeca.infront.assembler.support.AbstractAssembler.assemble(AbstractAssembler.java:101)
  at atg.endeca.assembler.AssemblerTools.invokeAssembler(AssemblerTools.java:369)
  at atg.endeca.assembler.AssemblerPipelineServlet.service(AssemblerPipelineServlet.java:485)
  at atg.servlet.pipeline.PipelineableServletImpl.passRequest(PipelineableServletImpl.java:157)
  at atg.servlet.http.CookieBufferServlet.service(CookieBufferServlet.java:119)
  at atg.servlet.pipeline.PipelineableServletImpl.passRequest(PipelineableServletImpl.java:157)
  at atg.userprofiling.ExpiredPasswordServlet.service(ExpiredPasswordServlet.java:378)
  at atg.servlet.pipeline.PipelineableServletImpl.passRequest(PipelineableServletImpl.java:157)
 com.endeca.infront.assembler.support.ContentItemVisitor.traverseChildren(ContentItemVisitor.java:126)
  at com.endeca.infront.assembler.support.ContentItemVisitor.traverse(ContentItemVisitor.java:94)
  at com.endeca.infront.assembler.support.AbstractAssembler$Processor$PreprocessPass.traverse(AbstractAssembler.java:172)
  at com.endeca.infront.assembler.support.ContentItemVisitor.traverseChildren(ContentItemVisitor.java:126)
  at com.endeca.infront.assembler.support.ContentItemVisitor.traverse(ContentItemVisitor.java:94)
  at com.endeca.infront.assembler.support.AbstractAssembler$Processor$PreprocessPass.traverse(AbstractAssembler.java:172)
  at com.endeca.infront.assembler.support.AbstractAssembler$Processor.process(AbstractAssembler.java:161)
  at com.endeca.infront.assembler.support.AbstractAssembler.assemble(AbstractAssembler.java:93)
  ... 93 more


Solution :-

Change the scope of ContentSlotListConfig.properties from global to prototype.


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