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https://issues.apache.org/jira/browse/IBATIS-477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Butler closed IBATIS-477.
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Resolution: Invalid
Wow it's my week to read WebSphere heap dumps. Lucky me :)
It's a little hard to tell because of the lack of indentation, but it looks
like you've got 573 threads with a DaoContext object in a ThreadLocal. I'm
quite certain that iBATIS never puts a DaoContext in a ThreadLocal. So I'm
guessing you've got some non-standard DAO usage pattern going on. My guess is
that you are somehow rebuilding the DaoManager for each thread, rather than
building one instance of it storing it in a Singleton somewhere.
Please take this to the user lists. This is not a bug.
> iBatis 2.2 SQLMAP heap dump websphere 6.0 AIX , DB2 V8 zOS
> -----------------------------------------------------------
>
> Key: IBATIS-477
> URL: https://issues.apache.org/jira/browse/IBATIS-477
> Project: iBatis for Java
> Issue Type: Bug
> Components: SQL Maps
> Affects Versions: 2.2.0
> Environment: iBatis 2.2 AIX 5.x Websphere 6.0 , IBM DB2 V8 zOS ,
> JDBC
> Reporter: Jerry Sun
> Priority: Critical
>
> We have heap dump happens and track down to iBatis SQLMap. Please see
> following. Any help will be appreciate. Thanks !
> Maximum heap was set to 1024m and almost 1000mb of heap is in use.
> Anlaysis of the heapdump shows the com/ibatis/sqlmap/engine/*
> code occupying most of heap(Nearly 900mb).
> ********************
>
> 402,544,512 (45%) [8,208] 573 array of
> java/lang/ThreadLocal$ThreadLocalMap$Entry 0x70000000cf85290
> 3,812,624 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x700000016051ca0
> 3,761,584 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x7000000308d4048
> 3,761,584 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000002a51fb30
> 3,761,536 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000003ff49b38
> 3,761,472 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000003fbea490
> 3,761,456 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000002663c540
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x700000023a3f510
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000001f850c20
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000002c798748
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000002beb8b08
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000000d431208
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x700000035b745f8
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000001ce4ae18
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000003623f1f0
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x700000022339948
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000001bffe348
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000001bcf6960
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x70000003e6e9058
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x7000000223b3130
> 3,761,240 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x700000007d7a088
> There are 553 more children
>
>
>
>
>
>
>
> Expansion of each of the object shows the com/ibatis/sqlmap/engine/*
> code
> 3,812,624 (0%) [48] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry
> 0x700000016051ca0
> 3,812,560 (0%) [32] 1 java/util/ArrayList 0x700000016051c78
> 3,812,528 (0%) [96] 1 array of java/lang/Object 0x700000016051c08
> 3,812,432 (0%) [64] 5 com/ibatis/dao/engine/impl/DaoContext
> 0x7000000105fb018
> 3,792,120 (0%) [24] 1
> com/ibatis/dao/engine/transaction/sqlmap/SqlMapDaoTransactionManager
> 0x7000000105fa258
> 3,792,096 (0%) [32] 2
> com/ibatis/sqlmap/engine/impl/SqlMapClientImpl 0x7000000109ebaa8
> 3,792,064 (0%) [128] 10
> com/ibatis/sqlmap/engine/impl/SqlMapExecutorDelegate 0x700000010714088
> 3,237,584 (0%) [64] 1 java/util/HashMap 0x700000010714038
> 3,237,520 (0%) [8,208] 492 array of java/util/HashMap$Entry
> 0x700000013cbaf98
> 31,464 (0%) [40] 3 java/util/HashMap$Entry 0x7000000151c1128
> 28,144 (0%) [40] 3 java/util/HashMap$Entry 0x700000013edc5c8
> 3,208 (0%) [128] 8
> com/ibatis/sqlmap/engine/mapping/statement/InsertStatement
> 0x7000000151b8010
> 2,584 (0%) [72] 7
> com/ibatis/sqlmap/engine/mapping/parameter/BasicParameterMap
> 0x7000000151b7558
> 1,112 (0%) [48] 4 array of
> com/ibatis/sqlmap/engine/mapping/parameter/BasicParameterMapping
> 0x7000000151c14b8
> 272 (0%) [104] 4
> com/ibatis/sqlmap/engine/mapping/parameter/BasicParameterMapping
> 0x7000000151c1880
> 168 (0%) [32] 1 java/lang/String 0x7000000151c1850
> 136 (0%) [136] 0 char[] 0x7000000151c17c0
> 48 (0%) [32] 1 java/lang/String 0x700000005488f60
> 32 (0%) [32] 1 java/lang/String 0x7000000151c18f8
> 16 (0%) [16] 0
> com/ibatis/sqlmap/engine/type/StringTypeHandler 0x7000000108c3700
> 272 (0%) [104] 4
> com/ibatis/sqlmap/engine/mapping/parameter/BasicParameterMapping
> 0x7000000151c1718
> 264 (0%) [104] 4
> com/ibatis/sqlmap/engine/mapping/parameter/BasicParameterMapping
> 0x7000000151b72c0
> 256 (0%) [104] 4
> com/ibatis/sqlmap/engine/mapping/parameter/BasicParameterMapping
> 0x7000000151c19d8
> 936 (0%) [64] 1 java/util/HashMap 0x7000000151b7508
> 352 (0%) [48] 3
> com/ibatis/sqlmap/engine/exchange/JavaBeanDataExchange 0x7000000151c1320
> 112 (0%) [32] 1 java/lang/String 0x7000000151b73d8
> 3,792,064 (0%) [128] 10
> com/ibatis/sqlmap/engine/impl/SqlMapExecutorDelegate 0x700000010714088
> 304 (0%) [304] 0 class
> com/obus/admin/policyLinks/data/ServicesDTO 0x7000000151bdcc8
> 160 (0%) [32] 1 java/lang/String 0x700000010bcb0d8
> 352 (0%) [24] 1
> com/ibatis/sqlmap/engine/mapping/sql/stat/StaticSql 0x7000000151c1160
> 128 (0%) [32] 1 java/util/ArrayList 0x7000000151b7fc8
> 16 (0%) [16] 0 array of
> com/ibatis/sqlmap/engine/mapping/result/ResultMap 0x7000000151b7ff0
> *****************************************
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