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Details

Type: Bug Report
Resolution: Fixed
Priority: L3 - Default
Fix Version/s: 7.4.0, 7.3.2, 7.4.0-alpha1
Affects Version/s: 7.3.0
Component/s: engine
Labels:
None

Description

Problem description:

executing many concurrent requests leads to exceptions thrown by mybatis.

Context Information:

The problem may be the following mybatis issue (unconfirmed):
https://github.com/mybatis/mybatis-3/issues/224.

We should only try to fix this for the current MyBatis version. Upgrading to a newer version of Mybatis can be extracted as an individual issue but we will not work on that now.

===

Notes:

See Forum: https://groups.google.com/forum/#!msg/camunda-bpm-users/2UTm6fbKeMw/shAYRRZIXrgJ

When putting load on the engine you might see the exception mentioned in the forum post. I could reproduce this using the attached JMeter Testplan).

Upgrading to Mybatis 3.3.0 rsolves that problem - at least I could no longer reproduce the error (I removed all orderBy manually to be able to run the tests with MyBatis 3.3.0 - see next line).

But with MyBatis 3.3.0 all "select..:By" queries are broken due to the orderBy-logic, e.g.:

SEVERE: Error while closing command context
org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: org.h2.jdbc.JdbcSQLException: Syntax Fehler in SQL Befehl "SELECT RES.*


    FROM ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     ORDER BY  ORDER[*] BY RES.ID_ ASC
    LIMIT ? OFFSET ? "; erwartet "=, NOT, EXISTS, SELECT, FROM"
Syntax error in SQL statement "SELECT RES.*


    FROM ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     ORDER BY  ORDER[*] BY RES.ID_ ASC
    LIMIT ? OFFSET ? "; expected "=, NOT, EXISTS, SELECT, FROM"; SQL statement:
select RES.*


    from ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     order by  order by RES.ID_ asc
    LIMIT ? OFFSET ? [42001-168]
### The error may exist in org/camunda/bpm/engine/impl/mapping/entity/ProcessDefinition.xml
### The error may involve org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionEntity.selectProcessDefinitionsByQueryCriteria
### The error occurred while executing a query
### SQL: select RES.*                   from ACT_RE_PROCDEF RES                  WHERE  RES.DEPLOYMENT_ID_ = ?           order by  order by RES.ID_ asc       LIMIT ? OFFSET ?
### Cause: org.h2.jdbc.JdbcSQLException: Syntax Fehler in SQL Befehl "SELECT RES.*


    FROM ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     ORDER BY  ORDER[*] BY RES.ID_ ASC
    LIMIT ? OFFSET ? "; erwartet "=, NOT, EXISTS, SELECT, FROM"
Syntax error in SQL statement "SELECT RES.*


    FROM ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     ORDER BY  ORDER[*] BY RES.ID_ ASC
    LIMIT ? OFFSET ? "; expected "=, NOT, EXISTS, SELECT, FROM"; SQL statement:
select RES.*


    from ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     order by  order by RES.ID_ asc
    LIMIT ? OFFSET ? [42001-168]
        at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)
        at org.camunda.bpm.engine.impl.db.sql.DbSqlSession.selectList(DbSqlSession.java:86)
        at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectListWithRawParameter(DbEntityManager.java:164)
        at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectList(DbEntityManager.java:156)
        at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectList(DbEntityManager.java:148)
        at org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionManager.findProcessDefinitionsByQueryCriteria(ProcessDefinitionManager.java:57)
        at org.camunda.bpm.engine.impl.ProcessDefinitionQueryImpl.executeList(ProcessDefinitionQueryImpl.java:249)
        at org.camunda.bpm.engine.impl.AbstractQuery.evaluateExpressionsAndExecuteList(AbstractQuery.java:179)
        at org.camunda.bpm.engine.impl.AbstractQuery.list(AbstractQuery.java:136)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd.getDeployedProcesses(DeployCmd.java:273)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd.resumePreviousByProcessDefinitionKey(DeployCmd.java:244)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd.registerProcessApplication(DeployCmd.java:216)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd$1.call(DeployCmd.java:105)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd$1.call(DeployCmd.java:82)
        at org.camunda.bpm.engine.impl.interceptor.CommandContext.runWithoutAuthorization(CommandContext.java:485)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:82)
        at org.camunda.bpm.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:65)
        at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
        at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:97)
        at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32)
        at org.camunda.bpm.engine.impl.RepositoryServiceImpl.deploy(RepositoryServiceImpl.java:82)
        at org.camunda.bpm.engine.impl.repository.DeploymentBuilderImpl.deploy(DeploymentBuilderImpl.java:125)
        at org.camunda.bpm.engine.impl.repository.ProcessApplicationDeploymentBuilderImpl.deploy(ProcessApplicationDeploymentBuilderImpl.java:57)
        at org.camunda.bpm.container.impl.deployment.DeployProcessArchiveStep.performOperationStep(DeployProcessArchiveStep.java:129)
        at org.camunda.bpm.container.impl.spi.DeploymentOperation.execute(DeploymentOperation.java:117)
        at org.camunda.bpm.container.impl.jmx.MBeanServiceContainer.executeDeploymentOperation(MBeanServiceContainer.java:148)
        at org.camunda.bpm.container.impl.spi.DeploymentOperation$DeploymentOperationBuilder.execute(DeploymentOperation.java:209)
        at org.camunda.bpm.container.impl.RuntimeContainerDelegateImpl.deployProcessApplication(RuntimeContainerDelegateImpl.java:87)
        at org.camunda.bpm.application.AbstractProcessApplication.deploy(AbstractProcessApplication.java:51)
        at org.camunda.bpm.application.impl.ServletProcessApplication.contextInitialized(ServletProcessApplication.java:131)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5014)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5528)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
        at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1263)
        at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1948)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)
Caused by: org.h2.jdbc.JdbcSQLException: Syntax Fehler in SQL Befehl "SELECT RES.*


    FROM ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     ORDER BY  ORDER[*] BY RES.ID_ ASC
    LIMIT ? OFFSET ? "; erwartet "=, NOT, EXISTS, SELECT, FROM"
Syntax error in SQL statement "SELECT RES.*


    FROM ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     ORDER BY  ORDER[*] BY RES.ID_ ASC
    LIMIT ? OFFSET ? "; expected "=, NOT, EXISTS, SELECT, FROM"; SQL statement:
select RES.*


    from ACT_RE_PROCDEF RES


     WHERE  RES.DEPLOYMENT_ID_ = ?

     order by  order by RES.ID_ asc
    LIMIT ? OFFSET ? [42001-168]
        at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
        at org.h2.message.DbException.get(DbException.java:169)
        at org.h2.message.DbException.getSyntaxError(DbException.java:194)
        at org.h2.command.Parser.getSyntaxError(Parser.java:491)
        at org.h2.command.Parser.readTerm(Parser.java:2447)
        at org.h2.command.Parser.readFactor(Parser.java:2046)
        at org.h2.command.Parser.readSum(Parser.java:2033)
        at org.h2.command.Parser.readConcat(Parser.java:2006)
        at org.h2.command.Parser.readCondition(Parser.java:1871)
        at org.h2.command.Parser.readAnd(Parser.java:1852)
        at org.h2.command.Parser.readExpression(Parser.java:1844)
        at org.h2.command.Parser.parseEndOfQuery(Parser.java:1578)
        at org.h2.command.Parser.parseSelectUnionExtension(Parser.java:1558)
        at org.h2.command.Parser.parseSelectUnion(Parser.java:1528)
        at org.h2.command.Parser.parseSelect(Parser.java:1515)
        at org.h2.command.Parser.parsePrepared(Parser.java:405)
        at org.h2.command.Parser.parse(Parser.java:279)
        at org.h2.command.Parser.parse(Parser.java:255)
        at org.h2.command.Parser.prepareCommand(Parser.java:217)
        at org.h2.engine.Session.prepareLocal(Session.java:415)
        at org.h2.engine.Session.prepareCommand(Session.java:364)
        at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1109)
        at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:74)
        at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:264)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
        at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:109)
        at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:80)
        at com.sun.proxy.$Proxy6.prepareStatement(Unknown Source)
        at org.apache.ibatis.executor.statement.PreparedStatementHandler.instantiateStatement(PreparedStatementHandler.java:79)
        at org.apache.ibatis.executor.statement.BaseStatementHandler.prepare(BaseStatementHandler.java:88)
        at org.apache.ibatis.executor.statement.RoutingStatementHandler.prepare(RoutingStatementHandler.java:58)
        at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:76)
        at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:61)
        at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120)
        ... 44 more

This has to adressed before moving to MyBatis 3.3.0

mgm-controller-panel

This is the controller panel for Smart Panels app

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MyBatisPlan.jmx
9 kB
12/Jun/15 6:50 PM

Issue Links

is related to

CAM-7041 Task query fails with ProcessEnginePersistenceException under heavy load

Closed

MyBatis/OGNL bugs lead to MyBatis exceptions under heavy load

Details

Description

mgm-controller-panel

This is the controller panel for Smart Panels app

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Dates

Salesforce