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JPA中的持久化上下文是EntityManager,内部实现使用了HibernateSession(使用Hibernate作为持久化provider)。引入相关的静态文件这里我使用到了Bootstrap和jQuery两个库,当然这个并不是必须的,只是为了让我们显示的效果更好看一些,静态文件我们要放在src/main/resources/static目录下。一.并发模式失败(concurrentmodefailure)并发模式失败日志:2016-02-21T13:53:07.974+0800:171467.254:[GC[1CMS-initial-mark:1436199K(1560576K)]1512927K(2504320K),0.0618140secs][Times:user=0.06sys=0.00,real=0.07secs]?2016-02-21T13:53:08.036+0800:171467.316:[CMS-concurrent-mark-start]?2016-02-21T13:53:08.377+0800:171467.657:[CMS-concurrent-mark:0.340/0.340secs][Times:user=2.11sys=0.15,real=0.34secs]?2016-02-21T13:53:08.377+0800:171467.657:[CMS-concurrent-preclean-start]?2016-02-21T13:53:08.385+0800:171467.665:[CMS-concurrent-preclean:0.008/0.008secs][Times:user=0.01sys=0.00,real=0.01secs]?2016-02-21T13:53:08.385+0800:171467.665:[CMS-concurrent-abortable-preclean-start]?{HeapbeforeGCinvocations=88667(full45):??parnewgeneration?total943744K,used914399K[0x0000000757000000,0x0000000797000000,0x0000000797000000)??edenspace838912K,100%used[0x0000000757000000,0x000000078a340000,0x000000078a340000)??fromspace104832K,?72%used[0x000000078a340000,0x000000078ecf7d98,0x00000007909a0000)??to?space104832K,?0%used[0x00000007909a0000,0x00000007909a0000,0x0000000797000000)??concurrentmark-sweepgenerationtotal1560576K,used1436199K[0x0000000797000000,0x00000007f6400000,0x00000007f6400000)??concurrent-mark-sweeppermgentotal159744K,used78413K[0x00000007f6400000,0x0000000800000000,0x0000000800000000)?2016-02-21T13:53:09.535+0800:171468.815:[GC2016-02-21T13:53:09.535+0800:171468.815:[ParNew?Desiredsurvivorsize53673984bytes,newthreshold6(max6)?-age?1:??7100568bytes,??7100568total?-age?2:??4676456bytes,?11777024total?-age?3:??8773736bytes,?20550760total?-age?4:??7709744bytes,?28260504total?-age?5:?10891960bytes,?39152464total?-age?6:?11735032bytes,?50887496total?:914399K->75616K(943744K),0.0414860secs]2350599K->1517225K(2504320K),0.0417710secs][Times:user=0.32sys=0.05,real=0.05secs]?HeapafterGCinvocations=88668(full45):??parnewgeneration?total943744K,used75616K[0x0000000757000000,0x0000000797000000,0x0000000797000000)??edenspace838912K,?0%used[0x0000000757000000,0x0000000757000000,0x000000078a340000)??fromspace104832K,?72%used[0x00000007909a0000,0x0000000795378128,0x0000000797000000)??to?space104832K,?0%used[0x000000078a340000,0x000000078a340000,0x00000007909a0000)??concurrentmark-sweepgenerationtotal1560576K,used1441609K[0x0000000797000000,0x00000007f6400000,0x00000007f6400000)??concurrent-mark-sweeppermgentotal159744K,used78413K[0x00000007f6400000,0x0000000800000000,0x0000000800000000)?}?2016-02-21T13:53:10.202+0800:171469.482:[CMS-concurrent-abortable-preclean:1.772/1.817secs][Times:user=4.94sys=0.06,real=1.81secs]?2016-02-21T13:53:10.204+0800:171469.483:[GC[YGoccupancy:497152K(943744K)]2016-02-21T13:53:10.204+0800:171469.483:[Rescan(parallel),1.3691900secs]2016-02-21T13:53:11.573+0800:171470.853:[weakrefsprocessing,0.1009300secs]2016-02-21T13:53:11.674+0800:1714?70.954:[classunloading,0.0153470secs]2016-02-21T13:53:11.689+0800:171470.969:[scrubsymboltable,0.0110770secs]2016-02-21T13:53:11.700+0800:171470.980:[scrubstringtable,0.0016360secs][1CMS-remark:1441609K(1560576K)]1938761K(2504320K),1.5079530secs][Ti?mes:user=13.01sys=0.08,real=1.51secs]?2016-02-21T13:53:11.712+0800:171470.992:[CMS-concurrent-sweep-start]?{HeapbeforeGCinvocations=88668(full45):??parnewgeneration?total943744K,used914528K[0x0000000757000000,0x0000000797000000,0x0000000797000000)??edenspace838912K,100%used[0x0000000757000000,0x000000078a340000,0x000000078a340000)??fromspace104832K,?72%used[0x00000007909a0000,0x0000000795378128,0x0000000797000000)??to?space104832K,?0%used[0x000000078a340000,0x000000078a340000,0x00000007909a0000)??concurrentmark-sweepgenerationtotal1560576K,used1441606K[0x0000000797000000,0x00000007f6400000,0x00000007f6400000)??concurrent-mark-sweeppermgentotal159744K,used78413K[0x00000007f6400000,0x0000000800000000,0x0000000800000000)?2016-02-21T13:53:11.775+0800:171471.055:[GC2016-02-21T13:53:11.775+0800:171471.055:[ParNew(promotionfailed)?Desiredsurvivorsize53673984bytes,newthreshold6(max6)?-age?1:??4030872bytes,??4030872total?-age?2:??5959704bytes,??9990576total?-age?3:??4628680bytes,?14619256total?-age?4:??8773080bytes,?23392336total?-age?5:??7707144bytes,?31099480total?-age?6:?10890224bytes,?41989704total?:914528K->907344K(943744K),1.0312010secs]2016-02-21T13:53:12.807+0800:171472.086:[CMS2016-02-21T13:53:14.455+0800:171473.735:[CMS-concurrent-sweep:1.684/2.743secs][Times:user=3.69sys=0.36,real=2.74secs]??(concurrentmodefailure):1451903K->475795K(1560576K),3.9644230secs]2356134K->475795K(2504320K),[CMSPerm:78413K->78413K(159744K)],4.9959570secs][Times:user=5.65sys=0.34,real=5.00secs]?HeapafterGCinvocations=88669(full46):??parnewgeneration?total943744K,used0K[0x0000000757000000,0x0000000797000000,0x0000000797000000)??edenspace838912K,?0%used[0x0000000757000000,0x0000000757000000,0x000000078a340000)??fromspace104832K,?0%used[0x000000078a340000,0x000000078a340000,0x00000007909a0000)??to?space104832K,?0%used[0x00000007909a0000,0x00000007909a0000,0x0000000797000000)??concurrentmark-sweepgenerationtotal1560576K,used475795K[0x0000000797000000,0x00000007f6400000,0x00000007f6400000)??concurrent-mark-sweeppermgentotal159744K,used78413K[0x00000007f6400000,0x0000000800000000,0x0000000800000000)?}两个原因:在CMS启动过程中,新生代提升速度过快,老年代收集速度赶不上新生代提升速度在CMS启动过程中,老年代碎片化严重,无法容纳新生代提升上来的大对象发送这种情况,应用线程将会全部停止(相当于网站这段时间无法响应用户请求),进行压缩式垃圾收集(回退到SerialOld算法)解决办法:新生代提升过快问题:(1)如果频率太快的话,说明空间不足,首先可以尝试调大新生代空间和晋升阈值。也正是因为南昌市场接纳度比较低,也给崔景超带来了蓝海市场。JBN:今后的愿望是什么?王雅融:去国外念书,体验西方国家的文化。

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