ConcurrentModificationException collection list multi-thread jboss

**gudepier42** · 07/05/2010, 10h45

Bonjour,

je m'arrache les cheveux depuis un petit temps avec cette erreur:

Code :

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javax.ejb.EJBException: java.util.ConcurrentModificationException
	at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:77)
	at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
	at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421)
	at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
	at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
	at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
	at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:744)
	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:697)
	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:524)
	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:232)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:782)
	at java.util.ArrayList$Itr.next(ArrayList.java:754)
	at org.hibernate.collection.AbstractPersistentCollection$IteratorProxy.next(AbstractPersistentCollection.java:577)
	at dns.redundancy.uccImpl.ManagerUsersImpl.saveZoneConfiguration(ManagerUsersImpl.java:497)
	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:616)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)
	at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)
	at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)
	at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)
	at sun.reflect.GeneratedMethodAccessor274.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)
	at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_23075407.invoke(InvocationContextInterceptor_z_fillMethod_23075407.java)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)
	at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_23075407.invoke(InvocationContextInterceptor_z_setup_23075407.java)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
	at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421)
	at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
	at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
	at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
	at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:744)
	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:697)
	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:524)
	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:232)
	at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:211)
	at org.jboss.remoting.Client.invoke(Client.java:1724)
	at org.jboss.remoting.Client.invoke(Client.java:629)
	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
	at $Proxy6.invoke(Unknown Source)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
	at $Proxy1.saveZoneConfiguration(Unknown Source)
	at addData.main(addData.java:92)
	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
	at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
	at $Proxy6.invoke(Unknown Source)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
	at $Proxy1.saveZoneConfiguration(Unknown Source)
	at addData.main(addData.java:92)

Je sais qu'elle proviens du fait que la liste est traitée par plusieurs threads simultanés et que pendant que l'un deux effectue une lecture d'un élément, un autre fait une modification sur un autre élément et que cela n'est pas permis car la liste "est modifiée"...
Avez-vous une idée pour résoudre ce problème?

Si je me souviens bien, il est proscrit d'utiliser le mot clé synchronized et je ne pense pas que de passer les classes ucc de stateless en statefull permettra de répondre notament à ce problème...?

Sinon, je suis tombé là-dessus http://wiki.eclipse.org/Using_Eclips...ned_Annotation, mais sans grande conviction...

Donc, je suis ouvert à toutes suggestions...

Merci

Sans oublier le code sources concerné:

dns.redundancy.uccImpl.ManagerUsersImpl:

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//imports ...
 
@Stateless
public class ManagerUsersImpl implements ManagerUsers {
 
    private static final Logger log = Logger.getLogger(ManagerUsersImpl.class.getName());
 
    @EJB
    private HostnameDao hostnameDao;
    @EJB
    private HostnameIPDao hostnameIpDao;
    @EJB
    private AddressIPDao addressIpDao;
    @EJB
    private ZoneDao zoneDao;
    @EJB
    private UsersDao usersDao;
    @EJB
    private ManagerSystemHostnameBackup managerSystem;
 
//...
 
@Override
    public void saveZoneConfiguration(Zone zone) throws ArgumentInvalidException, UccSystemException, HostNotHaveAnAddressIPError {
	CheckerArguments.checkObject(zone);
 
	String slog = "Saving the zone's hostnames definitions of " + zone.getZoneName();
 
	log.info(slog);
 
	zone = this.zoneDao.reloadListHostnames(zone);
 
	for (Hostname h : zone.getListHostnames()) {
	    log.debug(slog + ": election for hostname " + h.getHostname());
	    h = this.hostnameDao.reloadListHostnameIP(h);
	    this.managerSystem.electAddressIPFor(h, true);
	}
	// FIXME doesn't work fine
 
	try {
	    this.managerSystem.checkADnsZoneFile(zone);
	} catch (SerialOutOfBoundException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (ZoneFileSystemException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (BadAddressIPException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (SshConnectionException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (TooMuchSshConnectionsOpenedException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	}
 
	log.info(slog + ": done");
    }

dns.redundancy.uccImpl.ManagerSystemHostnameBackupImpl:

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@Stateless
public class ManagerSystemHostnameBackupImpl implements ManagerSystemHostnameBackup, EncodeTimer {
 
    private static final Logger log = Logger.getLogger(ManagerSystemHostnameBackupImpl.class.getName());
 
    @EJB
    private HostnameIPDao hostnameIPDao;
    @EJB
    private HostnameDao hostnameDao;
    @EJB
    private AddressIPDao addressIpDao;
    @EJB
    private ZoneDao zoneDao;
    @EJB
    private UsersDao usersDao;
    @EJB
    private LogLatencyKADao logLatencyKADao;
    @Resource
    private TimerService timerService;
 
    private static List<AddressIP> listAddressIp_inInitTime;
 
    private static List<Zone> listZones_whoseSerialHasExceeded = new ArrayList<Zone>(3);
 
 
    private static List<Zone> listZonesFailedToReload = new ArrayList<Zone>(5);
 
    private static final String timerMsgWaitingList = "process at " + WAITING_PROCESS_HOUR + ":" + WAITING_PROCESS_MINUTES;
 
 
//...
 
 
    @Override
    public void electAddressIPFor(Hostname hostname, boolean writeTheFileLater) throws ArgumentInvalidException, HostNotHaveAnAddressIPError {
	CheckerArguments.checkObject(hostname);
 
	String slog = "Electing an IP for hostname " + hostname.getHostname() + "." + hostname.getZone().getZoneName() + ": ";
 
	log.info(slog);
 
	hostname = this.hostnameDao.find(hostname.getId());
	HostnameIP hi_candidate = this.hostnameIPDao.getHostnameIP_addressIpAvailable(hostname);
	HostnameIP hi_current = this.hostnameIPDao.getHostnameIP_referencedFrom(hostname);
 
	// check if the hostname has at least an IP (current or candidate)
	if (hi_current == null & hi_candidate == null) {
	    log.warn(slog + "this host has no IP address allocated");
	    throw new HostNotHaveAnAddressIPError(slog + "this host has no IP address allocated");
	}
 
	// check if there are any candidates
	if (hi_candidate == null) {
	    log.info(slog + "nothing to do because there is no IP candidate for hostname " + hostname.getHostname());
	    return;
	}
 
	if (hi_current == null) {
	    log.debug(slog + "do a reference switching (there was no designed ip for " + hostname.getHostname() + ")");
	    try {
		hi_candidate = this.hostnameIPDao.reload(hi_candidate);
		switchHostnameIpReference(hostname, hi_candidate, hi_candidate, writeTheFileLater);
	    } catch (SerialOutOfBoundException e) {
		// already logged
		return;
	    }
	}
 
	// compare the priority of the current IP and the candidate
	else if (hi_candidate.isMorePriorityThan(hi_current)) {
	    log.debug(slog + "do a reference switching between " + hi_current.getAddressIP().getAddressIPHumanFormat() + " and " + hi_candidate.getAddressIP().getAddressIPHumanFormat());
	    try {
		hi_current = this.hostnameIPDao.reload(hi_current);
		hi_candidate = this.hostnameIPDao.reload(hi_candidate);
		switchHostnameIpReference(hostname, hi_current, hi_candidate, writeTheFileLater);
	    } catch (SerialOutOfBoundException e) {
		// already logged
		return;
	    }
	}
	log.info(slog + "done");
    }
 
    @Override
    public void switchHostnameIpReference(Hostname hostname, HostnameIP old, HostnameIP newer, boolean writeTheFileLater) throws ArgumentInvalidException,
	    SerialOutOfBoundException {
	CheckerArguments.checkObject(hostname);
	CheckerArguments.checkObject(old);
	CheckerArguments.checkObject(newer);
 
	log.info("Switching hostname reference: " + hostname.getHostname() + " from " + old.getAddressIP().getAddressIPHumanFormat() + " to "
		+ newer.getAddressIP().getAddressIPHumanFormat());
 
 
	old = this.hostnameIPDao.reload(old);
	newer = this.hostnameIPDao.reload(newer);
 
	if (newer == null) {
	    log.debug("Switching hostname reference: the IP that will be referenced is unknown by the system");
	    return;
	}
 
	if (old == null) {
	    log.debug("Switching hostname reference: the IP that is referenced is unknown by the system");
	    return;
	}
 
	// switch the reference of IPs
	if (!old.equals(newer)) {
	    old.toDereference();
	    old = this.hostnameIPDao.update(old);
	}
 
	newer.toReference();
	newer = this.hostnameIPDao.update(newer);
 
	if (writeTheFileLater)
	    return;
 
	// updating the DNS zone file
	try {
	    hostname = this.hostnameDao.reloadListHostnameIP(hostname);
	    log.debug("Switching hostname reference: updating the DNS zone file of hostname " + hostname.getHostname());
	    checkADnsZoneFile(this.zoneDao.getZoneOf(hostname));
 
	    log.info("Switching hostname reference: done");
 
	} catch (ZoneFileSystemException e) {
	    log.error("Switching hostname reference: can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
	    throw new DnsRendundancySystemRuntimeException("Can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
 
	} catch (BadAddressIPException e) {
	    log.error("Switching hostname reference: can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
	    throw new DnsRendundancySystemRuntimeException("Can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
 
	} catch (SshConnectionException e) {
	    log.error("Switching hostname reference: can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
	    throw new DnsRendundancySystemRuntimeException("Can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
 
	} catch (TooMuchSshConnectionsOpenedException e) {
	    log.error("Switching hostname reference: can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
	    throw new DnsRendundancySystemRuntimeException("Can not update the zone file of " + hostname.getHostname() + " : " + e.getMessage());
	}
    }

**gudepier42** · 10/05/2010, 13h09

Solution au problème après un petit weekend reposant: il suffit simplement parcourir une copie de la liste...

Code :

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public void saveZoneConfiguration(Zone zone) throws ArgumentInvalidException, UccSystemException, HostNotHaveAnAddressIPError {
	CheckerArguments.checkObject(zone);
 
	String slog = "Saving the zone's hostnames definitions of " + zone.getZoneName();
 
	log.info(slog);
 
	zone = this.zoneDao.reloadListHostnames(zone);
 
	List<Hostname> copyList = new ArrayList<Hostname>(zone.getListHostnames());
	Hostname hCurrent;
 
	for (Hostname h : copyList) {
	    log.debug(slog + ": election for hostname " + h.getHostname());
	    hCurrent = zone.getListHostnames().get(zone.getListHostnames().indexOf(h));
	    hCurrent = this.hostnameDao.reloadListHostnameIP(hCurrent);
	    this.managerSystem.electAddressIPFor(hCurrent, true);
	}
 
	try {
	    this.managerSystem.checkADnsZoneFile(zone);
	} catch (SerialOutOfBoundException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (ZoneFileSystemException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (BadAddressIPException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (SshConnectionException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	} catch (TooMuchSshConnectionsOpenedException e) {
	    log.warn(slog, e);
	    throw new UccSystemException(slog, e);
	}
 
	log.info(slog + ": done");
    }

ConcurrentModificationException collection list multi-thread jboss [EJB3]

Java EE

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