Ah39 commented on issue #499: fastjson parse String may cause the memory leak . RouteInfoManager hold the RegisterBrokerBody jsonStr URL: https://github.com/apache/rocketmq/issues/499#issuecomment-431287832 About the String subString diffrent behavior in JDK 1.6 , JDK 1.7 https://www.zhihu.com/question/44199956/answer/112224034 
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