Concurrent modification jdo exception
Hi,
When multiple ejb instances/threads are accessing the same persistence
object I get this exception:
javax.jdo.JDOUserException: An instance was concurrently modified in another
transaction (optimistic lock #: 238).
FailedObject:dk.pine.mediamanager.ejb.model.Application-58
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManager
Impl.java:577)
at
com.solarmetric.kodo.ee.EEPersistenceManager.beforeCompletion(EEPersistenceM
anager.java:192)
at org.jboss.tm.TxCapsule.doBeforeCompletion(TxCapsule.java:1394)
at org.jboss.tm.TxCapsule.commit(TxCapsule.java:364)
(full stack trace included as attachment)
The only field accessed is a collection - objects are added to the
collection from several bean instances.
Is kodo not supposed to handle this?
The optimistic property is set to default (true). I've tried setting it to
false, but then the app server hangs or dead locks occur in the database.
System configuration:
jdk 1.4
kodo 2.4.2
jboss 3.0.4
sql server 2000
windows 2000
Thanks
Jesper
begin 666 concurrent-kodo-exception.txt
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M+F-O<F4N4W
Kodo handled the concurrency by telling you your instance was stale.
I.e:
A bank account starts with $0.
A person retrieves the account with $0 balance.
Person 2 retrieves the account with $0 balance.
Person 1 deposits the account with $5 ($0 + $5 = $5 total).
Person 2 deposits the account with $2 ($0 + $2 = $2 total)
Person 1 commits. The Account the DB is now at $5.
Person 2 attempts to commit. The version of Account is stale, and thus
tells the application that Person 2 is attempting to put in invalid data
(it should instead be at $7).
With pessismistic locking, Person 2 has to wait for Person 1 to finish.
Thus the deadlock:
Person 1 locks up resource a.
Person 2 locks up resource b.
Person 2 attempts to lock up resource a but is waiting for Person 1 to
finish.
Person 1 attempts to lock up resource b but is waiting for Person 2 to
finish.
These are the kinds of situations that Kodo does handle, but it is up to
you to figure out what to do when such concurrency situations happen...
i.e. handle the optimistic lock exception.
Jesper Ladegaard wrote:
Hi,
When multiple ejb instances/threads are accessing the same persistence
object I get this exception:
javax.jdo.JDOUserException: An instance was concurrently modified in another
transaction (optimistic lock #: 238).
FailedObject:dk.pine.mediamanager.ejb.model.Application-58
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManager
Impl.java:577)
at
com.solarmetric.kodo.ee.EEPersistenceManager.beforeCompletion(EEPersistenceM
anager.java:192)
at org.jboss.tm.TxCapsule.doBeforeCompletion(TxCapsule.java:1394)
at org.jboss.tm.TxCapsule.commit(TxCapsule.java:364)
(full stack trace included as attachment)
The only field accessed is a collection - objects are added to the
collection from several bean instances.
Is kodo not supposed to handle this?
The optimistic property is set to default (true). I've tried setting it to
false, but then the app server hangs or dead locks occur in the database.
System configuration:
jdk 1.4
kodo 2.4.2
jboss 3.0.4
sql server 2000
windows 2000
Thanks
Jesper
2003-03-31 15:06:28,520 TRACE [org.jboss.tm.TxCapsule] failed before completion
javax.jdo.JDOUserException: Errors were detected when flushing to the data store. If using optimistic transactions, this could indicate that lock violations were detected. The "getNestedExceptions" method of this Exception will return the specific errors.
NestedThrowables:
javax.jdo.JDOUserException: An instance was concurrently modified in another transaction (optimistic lock #: 238).
FailedObject:dk.pine.mediamanager.ejb.model.Application-58
at com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:577)
at com.solarmetric.kodo.ee.EEPersistenceManager.beforeCompletion(EEPersistenceManager.java:192)
at org.jboss.tm.TxCapsule.doBeforeCompletion(TxCapsule.java:1394)
at org.jboss.tm.TxCapsule.commit(TxCapsule.java:364)
at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:73)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:201)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:60)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:204)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:313)
at org.jboss.ejb.Container.invoke(Container.java:712)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:98)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:102)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:111)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
at $Proxy52.createTemplate(Unknown Source)
at dk.pine.mediacreator.web.TemplateUploadAction.execute(TemplateUploadAction.java:90)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:437)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:264)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1109)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:470)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.WebFilter.doFilter(WebFilter.java:56)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:527)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:469)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:536)
NestedThrowablesStackTrace:
javax.jdo.JDOUserException: An instance was concurrently modified in another transaction (optimistic lock #: 238).
FailedObject:dk.pine.mediamanager.ejb.model.Application-58
at com.solarmetric.kodo.impl.jdbc.ormapping.ClassMapping$1.afterUpdate(ClassMapping.java:611)
at com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executeInternal(SQLExecutionManagerImpl.java:455)
at com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.flush(SQLExecutionManagerImpl.java:272)
at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.flush(JDBCStoreManager.java:411)
at com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:575)
at com.solarmetric.kodo.ee.EEPersistenceManager.beforeCompletion(EEPersistenceManager.java:192)
at org.jboss.tm.TxCapsule.doBeforeCompletion(TxCapsule.java:1394)
at org.jboss.tm.TxCapsule.commit(TxCapsule.java:364)
at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:73)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:201)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:60)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:204)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:313)
at org.jboss.ejb.Container.invoke(Container.java:712)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:98)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:102)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:111)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
at $Proxy52.createTemplate(Unknown Source)
at dk.pine.mediacreator.web.TemplateUploadAction.execute(TemplateUploadAction.java:90)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:437)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:264)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1109)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:470)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.WebFilter.doFilter(WebFilter.java:56)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:527)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:469)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:536)
2003-03-31 15:06:28,530 TRACE [org.jboss.tm.TxCapsule] Before completion done, tx=XidImpl [FormatId=257, GlobalId=jla//19908, BranchQual=], status=STATUS_MARKED_ROLLBACK
2003-03-31 15:06:28,530 WARN [org.apache.struts.action.RequestProcessor]
2003-03-31 15:06:28,530 ERROR [org.jboss.web.localhost.Engine] StandardWrapperValve[action]: Servlet.service() for servlet action threw exception
javax.servlet.ServletException
at org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:498)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:439)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:264)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1109)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:470)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.WebFilter.doFilter(WebFilter.java:56)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:527)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:469)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:536)
2003-03-31 15:06:28,550 ERROR [org.jboss.web.localhost.Engine] ----- Root Cause -----
java.lang.reflect.UndeclaredThrowableException
at $Proxy52.createTemplate(Unknown Source)
at dk.pine.mediacreator.web.TemplateUploadAction.execute(TemplateUploadAction.java:90)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:437)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:264)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1109)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:470)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.WebFilter.doFilter(WebFilter.java:56)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at dk.pine.core.util.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:527)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:469)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:536)
Caused by: javax.transaction.RollbackException: Unable to commit, tx=XidImpl [FormatId=257, GlobalId=jla//19908, BranchQual=] status=STATUS_ROLLEDBACK
at org.jboss.tm.TxCapsule.commit(TxCapsule.java:425)
at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:73)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:201)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:60)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:204)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:313)
at org.jboss.ejb.Container.invoke(Container.java:712)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:98)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:102)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:111)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
... 46 more--
Stephen Kim
[email protected]
SolarMetric, Inc.
http://www.solarmetric.com
Similar Messages
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Revision: 1043
Author: [email protected]
Date: 2008-03-31 15:22:13 -0700 (Mon, 31 Mar 2008)
Log Message:
Bug: LCDS-184 - Concurrent modification exception thrown during remote subscription management
QA: Yes
Doc: No
Details:
Make the 'subscriptions' set in MessageClient/RemoteMessageClient concurrent modification safe.
Ticket Links:
http://bugs.adobe.com/jira/browse/LCDS-184
Modified Paths:
blazeds/branches/3.0.x/modules/core/src/java/flex/messaging/services/messaging/RemoteMess ageClient.java -
Revision: 1044
Author: [email protected]
Date: 2008-03-31 15:23:07 -0700 (Mon, 31 Mar 2008)
Log Message:
Bug: LCDS-184 - Concurrent modification exception thrown during remote subscription management
QA: Yes
Doc: No
Details:
Make the 'subscriptions' set in MessageClient/RemoteMessageClient concurrent modification safe.
Ticket Links:
http://bugs.adobe.com/jira/browse/LCDS-184
Modified Paths:
blazeds/branches/3.0.x/modules/core/src/java/flex/messaging/MessageClient.java -
Concurrent modification exception inside fully synchronized code
Hello,
We have a private list
private LinkedList<ConnectionChannel> channels = new LinkedList<ConnectionChannel>();that is accessed by multiple threads. One is traversing the items and operating on them, while another thread is adding and removing items to the list. Each such access to the list is protected with
synchronized(channels) {
} scopes so that no simultanious access to this list is possible.
We do however get Concurrent Modification excpetions on this list when we do performance tests with heavy load on the sun server + heavy load on the java server itself. I cannot understand this problem in any other way that this must be a problem with the virtual machine! I know you guys probably will object to this furiously, but I am 100% sure that there is no logical error in my code.
We're running on jre 1.5..0_03. uname -a on my solaris host gives me:
SunOS trinity 5.8 Generic_108528-27 sun4u sparc SUNW,Sun-Fire-480R.
Best regards,
Helge FredriksenI'm very sure about this, yes. Here's all blocks where the list is used:
synchronized (channels) {
logger.info("Connecting observer channel from client at " + token.getSource());
channels.add(new ConnectionChannel(token, globalObserver));
synchronized (channels) {
if (logger.isDebugEnabled()) {
logger.debug("Sending local event to processing in " + channels.size() + " parallel channel(s)");
for (ConnectionChannel connectionChanel : channels) {
connectionChanel.send(event);
synchronized (channels) {
for (Iterator<ConnectionChannel> iterator = channels.iterator(); iterator.hasNext();) {
ConnectionChannel connectionChannel = iterator.next();
if (connectionChannel.getToken().getId().equals(token.getId())) {
iterator.remove();
logger.info("Removing connection channel to " + token.getSource());
return;
}and
synchronized (channels) {
for (ConnectionChannel channel : channels) {
channel.flush(5000);
} -
Hello,
Just a question about a piece of code.
I have an EJB3 application with a simple Job object containing Configuration objects in an ArrayList.
The job is managed by a stateful session bean used to add and remove configurations. Cascading for the configurations inside the job is set to CascadeType.ALL.
Adding configurations works fine, but removing them is a standard way results in ConcurrentModificationExceptions.
I solved this exception by using thread synchronization inside the removeConfiguration method.
The workaround code is
public void removeConfiguration(String configName)
throws InvalidParameterException, EntityDoesNotExistException,
OperationNotAllowedException, StorageException {
if(job == null){
throw new OperationNotAllowedException("No job was created or selected.");
//Since removing elements from the list on configurations resulted
//in a concurrent modification exception at runtime, we had to create
//a deep clone of the array of configurations. After creating the deep
//clone, the element to remove will be removed from the deep copy.
//Both operations require non modification guarantee to the original
//configuration list.
//After updating the deep copy, the new list of configurations will
//be stored in the job. During this operation no modification guarantee
//is required for the deep copy.
List<Configuration> configurations = new ArrayList<Configuration>();
//Prevent modifications to the original list of configurations.
synchronized(job.getConfigurations()){
//Create the deep clone while locking the original configurations.
for(Configuration config : job.getConfigurations()){
configurations.add((Configuration)config.clone());
//Remove the object to be removed from the deep copy while locking
//the original configurations.
for(Configuration config : job.getConfigurations()){
if(config.getDescription().equals(configName)){
configurations.remove(config);
//Lock the deep copy and write it to the created/selected job.
//Prevent modifications to the deep copy.
synchronized(configurations){
job.setConfigurations(configurations);
}The code above works as expected and does not cause any exceptions.
The simplified code causing exceptions to be thrown:
public void removeConfiguration(String configName)
throws InvalidParameterException, EntityDoesNotExistException,
OperationNotAllowedException, StorageException {
if(job == null){
throw new OperationNotAllowedException("No job was created or selected.");
for(Configuration config : job.getConfigurations()){
if(config.getDescription().equals(configName)){
job.getConfigurations().remove(config);
}Allthough the first snippet works fine, it seems a bit strange to me. Isn't it recommended not to use synchronization inside business method and leave this up to the container?
Or is the solution just fine and not a problem at all. Code should be neat and not prone to errors or unexpected behaviour. This is my concern for the code above.
Better solutions are always welcome and will be Duke rewarded off course!
Thanks for your opinion. Regards,
KurtHi,
I replaced the synchronized code with the one below and everything works as expected.
Thanks to both of you for the fast response and for your help.
The new snippet looks a lot more solid to me.
public void removeConfiguration(String configName)
throws InvalidParameterException, OperationNotAllowedException {
ParameterValidation.stringNotNullNotEmpty(configName, "removeConfiguration", "config name", LOG);
if(job == null){
throw new OperationNotAllowedException("No job was created or selected.");
ListIterator<Configuration> lstConfiguration = job.getConfigurations().listIterator();
while(lstConfiguration.hasNext()){
Configuration config = lstConfiguration.next();
if(config.getDescription().equals(configName)){
lstConfiguration.remove();
}Regards,
Kurt -
Concurrent Modification of HashMap
I have a data structure like below
HashMap <String, HashMap<String, Object>>
Basically its a hashmap within a hash map. Its a global data structure.
I have a timerTask which at every interval iterates the inner hashMap and Modifies an attribute in the Object (Say Decrements an Integer attribute in the Object)
This will be continuing.
While the iteration is in progress inside the TimerTask, if i try to Modify the HashMap from outside via some other method call, I receive a concurrent Modification Exception.
My Question is, How to over come this Problem of managing both the things concurrently?wizsen wrote:
HashMap <String, HashMap<String, Object>>
Basically its a hashmap within a hash map.That's a bad idea. You almost certainly will want to encapsulate it in one way or another. You probably want a custom class to hold that structure.
Its a global data structure.What does that mean?
My Question is, How to over come this Problem of managing both the things concurrently?Avoid accessing the data structure from two places at the same time. Possibly using synchronization. -
I find that JBoss hides JDO exceptions which occur on commit. Does
anyone know how to successfully turn on TRACE level log4j output on
jboss 3.0.1RC1? Alternatively, is there a way of getting Kodo to log
exceptions when they are thrown?
Thanks,
TomYou can catch "unhandled" exceptions as well and do what you want with them.
Things such as NullPointerException fall under RuntimeException. If you catch that, you can log it as you see fit.
Is that what you're asking? -
Concurrent modification exception. What is causing this?
Here is my the pasrt of code causing the exception I have put a line comment ti indicate the line where it occurs. In addition I would like to know the cause of this eception as its a first for me.
Here is the full exception ....
Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:3
72)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at Contact.modifyExisting(Contact.java:432)
at Phonebook1.actionPerformed(Phonebook1.java:236)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:19
95)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.jav
a:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(BasicR
ootPaneUI.java:191)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:267)
at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:2
16)
at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.
java:2926)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2918)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
at java.awt.Component.processEvent(Component.java:5815)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.ja
va:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboard
FocusManager.java:697)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeybo
ardFocusManager.java:962)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeybo
ardFocusManager.java:834)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFoc
usManager.java:661)
at java.awt.Component.dispatchEventImpl(Component.java:4282)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)and the code.......
if(modifiedWork.length()>0)
try
modifiedWorkNum = Integer.parseInt(modifiedWork);
} //////// THIS IS LINE 372
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only enter numbers for a valid phone number to try again press the modify nutton again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
}Thanks in advance...Would you mind looking at my modifyExisting method I apologise as it is long. I have icluded a line comment on line 432.
public void modifyExisting()
{// Start of modifyExisting()
int count = 0;
int count1 = 0;
int count2 = 0;
int modifiedCellNum, modifiedWorkNum, modifiedHomeNum = 0;
boolean validModify = true;
boolean found = false;
String currentHome = "";
String currentWork = "";
String currentCell = "";
if(phoneList.size() > 0)
String nameOfContactToEdit = JOptionPane.showInputDialog(null,"Please enter the name of the contact you wish to edit details for or press cancel to exit");
if(nameOfContactToEdit == null)
finish();
if(nameOfContactToEdit.trim().length()<= 0)
JOptionPane.showMessageDialog(null,"You have entered an invalid name. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
modifyExisting();
validModify = false;
return;
String surnameOfContactToEdit = JOptionPane.showInputDialog(null,"Please enter the the surname for "+nameOfContactToEdit+" if one exists or press cancel to exit.");
if(surnameOfContactToEdit == null)
finish();
for(Person m: phoneList)
m = phoneList.get(count);
if((m.name).equals(nameOfContactToEdit.trim().toUpperCase())&&(m.surname).equals(surnameOfContactToEdit.trim().toUpperCase()))
currentHome = m.home;
currentWork = m.work;
currentCell = m.cell;
found = true;
count ++;
if(found == true)
String modifiedName = JOptionPane.showInputDialog("Please enter the new name for contact or press cancel to keep it as "+nameOfContactToEdit+".");
if(modifiedName == null)
modifiedName = nameOfContactToEdit;
if(modifiedName.trim().length()<= 0)
JOptionPane.showMessageDialog(null,"You have entered an invalid name. Please press the modify button to try again.","Error",JOptionPane.ERROR_MESSAGE);
return;
if(modifiedName.trim().length()>10)
JOptionPane.showMessageDialog(null,"You may not enter a new name longer than 10 characters long. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
modifyExisting();
return;
String modifiedSurname = JOptionPane.showInputDialog("Please enter the new surname for contact or press cancel to keep it as "+surnameOfContactToEdit+".");
if(modifiedSurname == null)
modifiedSurname = surnameOfContactToEdit;
if(modifiedSurname.trim().length()>10)
JOptionPane.showMessageDialog(null,"You may not enter a surname longer than 10 characters long. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
modifyExisting();
return;
String modifiedHome = JOptionPane.showInputDialog("Please enter a new home number for "+modifiedName+" or press cancel to keep it as is.");
if(modifiedHome == null)
modifiedHome = currentHome;
if(modifiedHome.length()>0)
try
modifiedHomeNum = Integer.parseInt(modifiedHome);
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only enter numbers for a valid phone number to try again press the modify nutton again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
if(modifiedHome.length() > 10)
JOptionPane.showMessageDialog(null,"You may not enter a number longer than 10 characters long. Please press the modify button to try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
String modifiedWork = JOptionPane.showInputDialog("Please enter a new home number for "+modifiedName+" or press cancel to keep it as is.");
if(modifiedHome == null)
modifiedWork = currentWork;
if(modifiedWork.length()>0)
try
modifiedWorkNum = Integer.parseInt(modifiedWork);
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only enter numbers for a valid phone number to try again press the modify nutton again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
if(modifiedWork.length() > 10)
JOptionPane.showMessageDialog(null,"You may not enter a number longer than 10 characters long. Please press the modify button to try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
String modifiedCell = JOptionPane.showInputDialog("Please enter a new home number for "+modifiedName+" or press cancel to keep it as is.");
if(modifiedCell == null)
modifiedCell = currentCell;
if(modifiedCell.length()>0)
try
modifiedCellNum = Integer.parseInt(modifiedCell);
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only enter numbers for a valid phone number to try again press the modify nutton again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
if(modifiedCell.length() > 10)
JOptionPane.showMessageDialog(null,"You may not enter a number longer than 10 characters long. Please press the modify button to try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
if((modifiedHome.length() <= 0) && (modifiedWork.length() <= 0) && (modifiedCell.length() <= 0))
JOptionPane.showMessageDialog(null,"The contact must have at least one number to be included in the phonebook. Please press modify button to try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
return;
for(Person z: phoneList)
z = phoneList.get(count1);
if((z.name).equals(modifiedName.trim().toUpperCase()) && (z.surname).equals(modifiedSurname.trim().toUpperCase()))
JOptionPane.showMessageDialog(null,"You may not enter duplicate contacts. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
validModify = false;
modifyExisting();
return;
count1 ++;
if(validModify == true)
for(Person contactToMod: phoneList)/////////////////////////////////////////////////////// line 432
contactToMod = phoneList.get(count2);
if((contactToMod.name.equals(nameOfContactToEdit.trim().toUpperCase())) && (contactToMod.surname.equals(surnameOfContactToEdit.trim().toUpperCase())))
try
contactToMod.setName(modifiedName.trim().toUpperCase());
contactToMod.setSurname(modifiedSurname.trim().toUpperCase());
contactToMod.setHome(modifiedHome);
contactToMod.setWork(modifiedWork);
contactToMod.setCell(modifiedCell);
phoneList.add(contactToMod);
JOptionPane.showMessageDialog(null,"Updated contact succesfully.","Information",JOptionPane.INFORMATION_MESSAGE);
catch(Exception e)
JOptionPane.showMessageDialog(null,"The contact was not updated. If probelm persists please contact system administrator.","Error",JOptionPane.ERROR_MESSAGE);
count2 ++;
else
JOptionPane.showMessageDialog(null,"No contact with that name and surname exists. Please press the modify button to try again.","Error",JOptionPane.ERROR_MESSAGE);
else
JOptionPane.showMessageDialog(null,"The phone list is empty and there are no contacts to modify.","Information Message",JOptionPane.INFORMATION_MESSAGE);
}// End of modifyExisting()Edited by: Yucca on May 6, 2008 8:12 PM -
Concurrent Modification Exception
im running 2 "for" loops on a TreeMap's keySet. But everytime I remove a mapping from the inner loop using iterators I get the CMException. Is there a way to remove a mapping in the inner loop without getting the Exception?
Try Using two references to the same iterator. At the moment, it sounds like you are getting an iterator twice, once for each loop.
-
List Concurrent Modification Exception
The following codes throws the java.util.ConcurrentModificationException
public static void main(String[] args) {
List<Integer> list1 = new LinkedList<Integer>();
ListIterator head = list1.listIterator();
list1.add(1);
while(head.hasNext()) {
System.out.println(head.next());
}But if I put list1.add(1) before
ListIterator head = list1.listIterator();, then it runs fine.
I've googled the exception and get the idea that it is caused by 2 threads accessing the list. Where are the 2 threads?
Edited by: pinkyDeveloper on Feb 17, 2009 3:00 PMnothing to do with threads and everything to do with changing the list after getting the iterator and then iterating with the iterator. Don't do this unless you change the list through the iterator. You might want to read the API on LinkedList which states:
The iterators returned by this class's iterator and listIterator methods are fail-fast: if the list is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove or add methods, the iterator will throw a ConcurrentModificationException.
Edited by: Encephalopathic on Feb 17, 2009 3:13 PM -
Concurrent modification exception while iterating through list
Hi,
I have a list of objects. I use for each loop in java to iterate through that list of objects and display them.
The problem is that while iterating other thread can add or remove some objects from that list, and I get ConcurrentModificationException.
How can I handle this problem. How can I be sure that I am iteration through the updated list.
Thank youSynchonize on the list before iterating through it, and make sure that other code also synchronizes on the list before adding to it or removing from it. Using a list implementation that simply synchronizes all the methods (e.g. Vector) will not do that, you have to do it yourself.
-
Concurrent Modification in a loop
This loop iterates through a list of urls that parses a document for urls, if it finds some, then it adds them to a PriorityQueue. I'm getting the modification exception when the loop runs the second time at the it.next() line. Can someone help me with why?
public synchronized void TidyProcess()
Iterator it = urlQueue.iterator();
String userURL;
while (it.hasNext())
javax.swing.JEditorPane jEditorPane1 = TC1.getEditorPane();
userURL = it.next().toString();
int position = jEditorPane1.getText().length();
try
jEditorPane1.getDocument().insertString(position, "Processing: " + userURL, null);
catch(javax.swing.text.BadLocationException e)
logger.debug(e.getMessage());
Document tidydoc = TP1.tagParser(userURL); //retrieves document in XML format
String xmldoc = tidydoc.toXML();
urlQueue.addAll(TP1.getUrls(tidydoc)); //Processes the document for urls, returns them in a PriorityQueue collection
}Message was edited by:
subnetrx
Message was edited by:
subnetrxYou need to add via the Iterator (cast it to a ListIterator) not to the collection itself, otherwise the iterator will complain.
-
Concurrent Task/Service Exception
Olá! How can I get the exception raised on a concurrent Task/Service class?
I have this Service:
private Service<Void> myService = new Service<Void>() {
@Override
protected Task createTask() {
return new Task<Void>() {
@Override
protected Void call() throws Exception {
throw new Exception("Hello, exception!");
};And this initialize function:
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
myService.stateProperty().addListener(new ChangeListener<State>() {
@Override
public void changed(ObservableValue<? extends State> ov, State t, State t1) {
System.out.println("state.changed " + t1);
myService.exceptionProperty().addListener(new ChangeListener<Throwable>() {
@Override
public void changed(ObservableValue<? extends Throwable> ov, Throwable t, Throwable t1) {
t1.printStackTrace();
}I call the Service this way:
@FXML
protected void myButtonAction(ActionEvent event) {
myService.start();
}Finally, the output is:
state.changed SCHEDULED
state.changed RUNNING
And the function silently stops at the point of the exception.
There's a way to get the exception raised?
Thanks,
Victor (Brazil)
PS: b42.
Edited by: Victor on 05/09/2011 07:32Hi Victor,
This is unfortunately a bug in the Asynch implementation at the moment. Seems a fix is due in b43: http://javafx-jira.kenai.com/browse/RT-15612
In the interim, I am using a dodgy little hack. I create my own Service base class like so:
private Service<Void> myService = new Service<Void>() {
private Throwable lastException;
@Override
protected Task createTask() {
return new Task<Void>() {
@Override
protected Void call() throws Exception {
lastException = null;
try {
// do background task as normal
catch (Throwable t) {
lastException = t;
};Then your initialise looks something like:
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
myService.stateProperty().addListener(new ChangeListener<State>() {
@Override
public void changed(ObservableValue<? extends State> ov, State t, State t1) {
if (t1 == Worker.State.SUCCEEDED) {
if (myService.getException() != null) {
// do success
} else {
// do failure with myService.getException()
}If you go for this, t's worth creating a base class that hides this cludge, then when b43 is released you have less refactoring to do.
Enjoy,
zonski -
Concurrent modification of Indirect Set
Hello, the last months I have been working with JPA without going deeply in it, currently my project is suffering some issues with concurrency.
I have a OneToMany relationship defined as a Set (default values that is transparent indirection), the core of the project is a EJB 3; when two concurrent invocations of the EJB 3 try to modify (adding and removing) an element of the Set toplink send a ConcurrentModificationException, I thought that toplink manages the concurrency but I must haver missed something...
Caused by: Exception [TOPLINK-6055] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.QueryException
Exception Description: The method invocation of the method [public java.lang.Object java.util.HashSet.clone()] on the object [[class org.cesga.ifec.engine.database.ACRequestRegister[id=1642], class org.cesga.ifec.engine.database.ACRequestRegister[id=1643], of class [class java.util.HashSet], triggered an exception.
Internal Exception: java.lang.reflect.InvocationTargetException
Target Invocation Exception: java.util.ConcurrentModificationException
at oracle.toplink.essentials.exceptions.QueryException.methodInvocationFailed(QueryException.java:746)
at oracle.toplink.essentials.internal.queryframework.InterfaceContainerPolicy.invokeCloneMethodOn(InterfaceContainerPolicy.java:221)
at oracle.toplink.essentials.internal.queryframework.InterfaceContainerPolicy.cloneFor(InterfaceContainerPolicy.java:105)
at oracle.toplink.essentials.mappings.CollectionMapping.buildCloneForPartObject(CollectionMapping.java:173)
at oracle.toplink.essentials.internal.indirection.UnitOfWorkQueryValueHolder.buildCloneFor(UnitOfWorkQueryValueHolder.java:75)
at oracle.toplink.essentials.internal.indirection.UnitOfWorkValueHolder.instantiateImpl(UnitOfWorkValueHolder.java:176)
at oracle.toplink.essentials.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:247)
at oracle.toplink.essentials.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:105)
at oracle.toplink.essentials.indirection.IndirectSet.buildDelegate(IndirectSet.java:193)
at oracle.toplink.essentials.indirection.IndirectSet.getDelegate(IndirectSet.java:308)
at oracle.toplink.essentials.indirection.IndirectSet.add(IndirectSet.java:168)
at org.cesga.ifec.engine.Engine.newACRequest(Engine.java:1608)
at sun.reflect.GeneratedMethodAccessor224.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1067)
at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:176)
at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2895)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:3986)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:197)
... 62 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor213.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at oracle.toplink.essentials.internal.security.PrivilegedAccessHelper.invokeMethod(PrivilegedAccessHelper.java:322)
at oracle.toplink.essentials.internal.queryframework.InterfaceContainerPolicy.invokeCloneMethodOn(InterfaceContainerPolicy.java:216)
... 80 more
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$EntryIterator.next(HashMap.java:834)
at java.util.HashMap$EntryIterator.next(HashMap.java:832)
at java.util.HashMap.putAllForCreate(HashMap.java:435)
at java.util.HashMap.clone(HashMap.java:669)
at java.util.HashSet.clone(HashSet.java:236)
... 85 more
Thanks!!
Luis M.The latest code in EclipseLink seems to be correctly synchronizing. You could try using EclipseLink 1.0 and see if the issue still occurs.
Workarounds may include:
- using a List or Collection instead of Set
- use eager
- use an isolated (not shared) cache
James : http://www.eclipselink.org -
Package Variable Concurrent Modification
Say I have the following public global variable defined in a package specification:
create or replace package my_pkg is
my_var number := 0;
end my_pkg;
Is it possible for procedures from other packages (or within the same package) to concurrently access/modify the value of my_var, or is there some sort of locking mechanism to protect against this? If not, is there any sort of semaphore implementation that would allow me to manually protect a shared resource?crottyan wrote:
So it's not possible to have multiple concurrent processes executing within a single session?Yes, but not the way you think.
A session is a serialised process. A session is serviced by a serialised Oracle server process. Threading is not supported in this processing model - and for very good and sound reasons.
However, a serialised session can be serviced by multiple parallel processing processes - courtesy of the Parallel Query (PQ) feature of Oracle. PQ can be used for servicing DDL and DML calls made by that session, in parallel - and this also includes the ability to run PL/SQL code in parallel via a feature called pipeline table functions.
However, this is more comparable to the Unix fork() model than the Windows CreateThread() model. Each PQ process is an actual process image in the kernel. It does not share the code or data segments of the process servicing that session.
There is a fundamental concept issue with your question though. It does not make ANY sense within Oracle architecture to have a package's data segment (and a static variable in it), being accessed concurrently. This is not how Oracle's concurrency model works. This should not even be a consideration during the design.
I suggest that you familiarise yourself properly with the Oracle architecture as the question shows serious gaps in understanding this architecture.
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