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From "Clement Escoffier (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (FELIX-4374) IPOJO: ConcurrentModificationException in ProvidedService
Date Fri, 07 Mar 2014 08:28:43 GMT

     [ https://issues.apache.org/jira/browse/FELIX-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Clement Escoffier closed FELIX-4374.
------------------------------------


> IPOJO: ConcurrentModificationException in ProvidedService
> ---------------------------------------------------------
>
>                 Key: FELIX-4374
>                 URL: https://issues.apache.org/jira/browse/FELIX-4374
>             Project: Felix
>          Issue Type: Bug
>          Components: iPOJO
>    Affects Versions: ipojo-runtime-1.11.0
>         Environment: Karaf 2.3.3
>            Reporter: Klaus Schröder
>            Assignee: Clement Escoffier
>             Fix For: ipojo-runtime-1.11.1
>
>
> I have a problem with a ManagedServices and IPOJO. 
> We have a service that provides externally configured properties. We want to use the
managed service approach to get automatic refreshs of changed properties. The properties are
read from a file {karaf}/etc/na.default.properties containing ~500 properties and are injected
into the service by @Updated, see code below. 
> Basically the code works fine, but from time to time the service startup fails with a
ConcurrentModificationException in class ProvidedService. The exception does not show always,
but it is reproducible by starting and stopping the bundle various times. The code has been
stripped down to be very simple and the problem could still be reproduced. 
> IPOJO version is 1.11.0, Karaf version 2.3.3 
> Short stacktrace: 
> {code}
> 2014-01-03 16:17:41,357 | INFO  |  pool-1-thread-1 | product-properties-services    
 | ?                                   ? | 64 - product-properties-services - 0.0.1.SNAPSHOT
| [INFO] com.nextaudience.clustor.product.properties.services.DefaultPropertiesResolverService
: An error occurred when creating an instance of com.nextaudience.clustor.product.properties.services.DefaultPropertiesResolverService

> java.util.ConcurrentModificationException 
>         at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1115)[:1.7.0_45]

>         at java.util.TreeMap$ValueIterator.next(TreeMap.java:1160)[:1.7.0_45] 
>         at org.apache.felix.ipojo.handlers.providedservice.ProvidedService.getServiceProperties(ProvidedService.java:447)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.handlers.providedservice.ProvidedService.registerService(ProvidedService.java:357)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler.__M_stateChanged(ProvidedServiceHandler.java:484)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler.stateChanged(ProvidedServiceHandler.java)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:536)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:418)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:179)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:319)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:240)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.extender.internal.linker.ManagedType$InstanceSupport$1.call(ManagedType.java:312)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.extender.internal.linker.ManagedType$InstanceSupport$1.call(ManagedType.java:306)[55:org.apache.felix.ipojo:1.11.0]

>         at org.apache.felix.ipojo.extender.internal.queue.JobInfoCallable.call(JobInfoCallable.java:114)[55:org.apache.felix.ipojo:1.11.0]

>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_45] 
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_45]

>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_45]

>         at java.lang.Thread.run(Thread.java:744)[:1.7.0_45] 
> 2014-01-03 16:17:41,357 | ERROR |  pool-1-thread-1 | product-properties-services    
 | ?                                   ? | 64 - product-properties-services - 0.0.1.SNAPSHOT
| [ERROR] com.nextaudience.clustor.product.properties.services.DefaultPropertiesResolverService
: null 
> {code}
> Our service: 
> {code
> @Component(managedservice = "na.default.properties", publicFactory = false) 
> @Instantiate 
> @Provides 
> public class DefaultPropertiesResolverService implements ObservablePropertiesResolver
{ 
>     private static final Logger LOG = LoggerFactory.getLogger(DefaultPropertiesResolverService.class);

>     @ServiceController 
>     private boolean ready; 
>     private Dictionary<String, String> properties; 
>     
>     @Validate 
>     synchronized private void startService() { 
>         LOG.info("startService start..."); 
>         if (getProperties() == null) { 
>             LOG.warn("No properties for " + getClass().getName()); 
>             return; 
>         } 
>         if (getProperties().isEmpty()) { 
>             LOG.warn("Empty properties for " + getClass().getName()); 
>             return; 
>         } 
>         ready = true; 
>         LOG.info(DefaultPropertiesResolverService.class.getName() + "::Start"); 
>     } 
>     @Invalidate 
>     synchronized private void stopService() { 
>         ready = false; 
>         LOG.info(DefaultPropertiesResolverService.class.getName() + "::Stop"); 
>     } 
>     synchronized public Dictionary<String, String> getProperties() { 
>         return properties; 
>     } 
>     
>     @Updated 
>     synchronized public void updateLocalProperties(Dictionary<String, String> cfgProperties)
{ 
>         LOG.info("DefaultProperties: updateLocalProperties start..."); 
>         properties = cfgProperties; 
>         LOG.info("DefaultProperties: updateLocalProperties end"); 
>     } 
> } 
> {code



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