Java.util.ConcurrentModificationException while getObjectById

I use Kodo 3.0.2:
I want to retrieve an objkect by its primary key (primary key class) in a
stateless session bean. This is the first time I call a method on the
PersistenceManager retrieved over JNDI.
The code is:
public synchronized long getNextIdentity(String numberRange) {
IdentityMaxKey id = new IdentityMaxKey();
id.setNumberRange(numberRange);
IdentityMax im = null;
im = (IdentityMax) pm.getObjectById(id, true); <-- Exception
return im.getAndIncMaxId();
And the result is the java.util.ConcurrentModificationException on the
appServer (JBoss 3.2.3). Whats wrong?
com.cmptsis.util.exception.ConfigurationException: Remote Exception while
accessing App-Server
     at
com.cmptsis.kiff.customer.delegate.ejb.CustomerDelegateImpl.createGroup(CustomerDelegateImpl.java:49)
     at
com.cmptsis.kiff.client.swing.TestFrame.createTestCustomerData(TestFrame.java:43)
     at com.cmptsis.kiff.client.swing.TestFrame.main(TestFrame.java:33)
Caused by: java.rmi.ServerException: RemoteException occurred in server
thread; nested exception is:
     java.rmi.ServerException: RuntimeException; nested exception is:
     kodo.util.FatalException: kodo.util.FatalException:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
     at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
     at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
     at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown
Source)
     at
org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:135)
     at
org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:96)
     at
org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
     at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:45)
     at
org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:100)
     at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85)
     at $Proxy1.createGroup(Unknown Source)
     at
com.cmptsis.kiff.customer.delegate.ejb.CustomerDelegateImpl.createGroup(CustomerDelegateImpl.java:46)
     ... 2 more
Caused by: java.rmi.ServerException: RuntimeException; nested exception
is:
     kodo.util.FatalException: kodo.util.FatalException:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
     at
org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:361)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
     at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at
org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331)
     at org.jboss.ejb.Container.invoke(Container.java:700)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
     at
org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
Caused by: kodo.util.FatalException: kodo.util.FatalException:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
     at kodo.util.FatalException.writeReplace(FatalException.java:74)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:896)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1011)
     at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
     at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
     at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
     at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:299)
     ... 6 more
Caused by: java.util.ConcurrentModificationException
     at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782)
     at java.util.HashMap$KeyIterator.next(HashMap.java:818)
     at
kodo.meta.JDOMetaDataRepositoryImpl.processRegisteredClasses(JDOMetaDataRepositoryImpl.java:522)
     at
kodo.meta.JDOMetaDataRepositoryImpl.getMetaData(JDOMetaDataRepositoryImpl.java:340)
     at
kodo.meta.DelegatingJDOMetaDataRepository.getMetaData(DelegatingJDOMetaDataRepository.java:167)
     at kodo.jdbc.meta.MappingRepository.getMapping(MappingRepository.java:248)
     at
kodo.jdbc.meta.MappingRepository.getMetaData(MappingRepository.java:237)
     at
kodo.runtime.PersistenceManagerImpl.newStateManager(PersistenceManagerImpl.java:1316)
     at
kodo.runtime.PersistenceManagerImpl.getObjectById(PersistenceManagerImpl.java:1280)
     at
kodo.runtime.PersistenceManagerImpl.getObjectById(PersistenceManagerImpl.java:1223)
     at
com.cmptsis.kiff.global.server.identity.jdo.JdoIdentityDAO.getNextIdentity(JdoIdentityDAO.java:21)
     at
com.cmptsis.kiff.global.server.identity.StandardDBIdentityFacade.nextIdentityByRange(StandardDBIdentityFacade.java:16)
     at
com.cmptsis.kiff.customer.server.facade.CustomerFacadeLogic.createGroup(CustomerFacadeLogic.java:24)
     at
com.cmptsis.kiff.customer.server.facade.ejb.CustomerSessionBean.createGroup(CustomerSessionBean.java:80)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:683)
     at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185)
     at
org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
     at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
     at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:267)
     at
org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128)
     at
org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
     at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at
org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331)
     at org.jboss.ejb.Container.invoke(Container.java:700)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
     at
org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
     ... 6 more
Exception in thread "main"

The issue is not solved yet...
Bernd Ruecker wrote:
I use Kodo 3.0.2:
I want to retrieve an objkect by its primary key (primary key class) in a
stateless session bean. This is the first time I call a method on the
PersistenceManager retrieved over JNDI.
The code is:
public synchronized long getNextIdentity(String numberRange) {
IdentityMaxKey id = new IdentityMaxKey();
id.setNumberRange(numberRange);
IdentityMax im = null;
im = (IdentityMax) pm.getObjectById(id, true); <-- Exception
return im.getAndIncMaxId();
And the result is the java.util.ConcurrentModificationException on the
appServer (JBoss 3.2.3). Whats wrong?
com.cmptsis.util.exception.ConfigurationException: Remote Exception while
accessing App-Server
     at
com.cmptsis.kiff.customer.delegate.ejb.CustomerDelegateImpl.createGroup(CustomerDelegateImpl.java:49)
     at
com.cmptsis.kiff.client.swing.TestFrame.createTestCustomerData(TestFrame.java:43)
     at com.cmptsis.kiff.client.swing.TestFrame.main(TestFrame.java:33)
Caused by: java.rmi.ServerException: RemoteException occurred in server
thread; nested exception is:
     java.rmi.ServerException: RuntimeException; nested exception is:
     kodo.util.FatalException: kodo.util.FatalException:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
     at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
     at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
     at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown
Source)
     at
org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:135)
     at
org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:96)
     at
org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
     at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:45)
     at
org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:100)
     at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85)
     at $Proxy1.createGroup(Unknown Source)
     at
com.cmptsis.kiff.customer.delegate.ejb.CustomerDelegateImpl.createGroup(CustomerDelegateImpl.java:46)
     ... 2 more
Caused by: java.rmi.ServerException: RuntimeException; nested exception
is:
     kodo.util.FatalException: kodo.util.FatalException:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
     at
org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:361)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
     at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at
org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331)
     at org.jboss.ejb.Container.invoke(Container.java:700)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
     at
org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
Caused by: kodo.util.FatalException: kodo.util.FatalException:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
NestedThrowables:
java.util.ConcurrentModificationException
     at kodo.util.FatalException.writeReplace(FatalException.java:74)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:896)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1011)
     at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
     at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
     at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
     at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
     at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:299)
     ... 6 more
Caused by: java.util.ConcurrentModificationException
     at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782)
     at java.util.HashMap$KeyIterator.next(HashMap.java:818)
     at
kodo.meta.JDOMetaDataRepositoryImpl.processRegisteredClasses(JDOMetaDataRepositoryImpl.java:522)
     at
kodo.meta.JDOMetaDataRepositoryImpl.getMetaData(JDOMetaDataRepositoryImpl.java:340)
     at
kodo.meta.DelegatingJDOMetaDataRepository.getMetaData(DelegatingJDOMetaDataRepository.java:167)
     at kodo.jdbc.meta.MappingRepository.getMapping(MappingRepository.java:248)
     at
kodo.jdbc.meta.MappingRepository.getMetaData(MappingRepository.java:237)
     at
kodo.runtime.PersistenceManagerImpl.newStateManager(PersistenceManagerImpl.java:1316)
     at
kodo.runtime.PersistenceManagerImpl.getObjectById(PersistenceManagerImpl.java:1280)
     at
kodo.runtime.PersistenceManagerImpl.getObjectById(PersistenceManagerImpl.java:1223)
     at
com.cmptsis.kiff.global.server.identity.jdo.JdoIdentityDAO.getNextIdentity(JdoIdentityDAO.java:21)
     at
com.cmptsis.kiff.global.server.identity.StandardDBIdentityFacade.nextIdentityByRange(StandardDBIdentityFacade.java:16)
     at
com.cmptsis.kiff.customer.server.facade.CustomerFacadeLogic.createGroup(CustomerFacadeLogic.java:24)
     at
com.cmptsis.kiff.customer.server.facade.ejb.CustomerSessionBean.createGroup(CustomerSessionBean.java:80)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:683)
     at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185)
     at
org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
     at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
     at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:267)
     at
org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128)
     at
org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
     at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at
org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331)
     at org.jboss.ejb.Container.invoke(Container.java:700)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
     at
org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
     ... 6 more
Exception in thread "main"

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    create an iterator and then after this you change the collection? does this sound safe?(...)after getting the iterator, don't modify the set (with exception as per api) and expect the iterator to work.
    Well, I think you are making fun of me here. It's OK, I don't mind, but I want to disagree with your reasons.
    "Does this sound safe?" Yes, why not? The iterator could refer to the set, whatever its contents. You could add to the set and, and then remove from it by iterator.next(), and add and remove... As long as you synchronise all these things (and I do), there is no general reason why this would be a bad thing.
    But of course, the API does prohibit that explicitly, you are right. It's just that when you naturally expect certain behaviour, you don't read all of the documentation.
    And then when ConcurrentModificationException happens, this exception name does not reflect what happens, as I said, I am not concurrently modifying anything in multiple threads. So the name of the exception threw me off track and I did not think it was the order of the operations that I did wrong.
    Anyway, thank you very much for help.

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