[ http://jira.qos.ch/browse/LBCLASSIC-51?page=com.atlassian.jira.plugin.system... ] Joern Huxhorn commented on LBCLASSIC-51: ---------------------------------------- I think the described problem might also be the reason for http://jira.qos.ch/browse/LBCLASSIC-14

Use of BasicStatusManager.iterator() without synchronization in ch.qos.logback.classic.jmx.Configurator -------------------------------------------------------------------------------------------------------

Key: LBCLASSIC-51 URL: http://jira.qos.ch/browse/LBCLASSIC-51 Project: logback-classic Issue Type: Bug Components: Other Affects Versions: unspecified Environment: Operating System: Windows Platform: PC Reporter: Joern Huxhorn Assignee: Ceki Gulcu

We sometimes receive strange exceptions in our webapp: [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: Exception in thread "Thread-6" java.lang.ArrayIndexOutOfBoundsException [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: at java.lang.System.arraycopy(Native Method) [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: at java.util.ArrayList.ensureCapacity(ArrayList.java:170) [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: at java.util.ArrayList.add(ArrayList.java:351) [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: at ch.qos.logback.core.BasicStatusManager.add(BasicStatusManager.java:38) [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: at ch.qos.logback.core.spi.ContextAwareBase.addStatus(ContextAwareBase.java:59) [21/Apr/2008:21:00:58] warning ( 1596): CORE3283: stderr: at ch.qos.logback.core.spi.ContextAwareBase.addInfo(ContextAwareBase.java:64) I just tried to analyze the problem and found out that ch.qos.logback.classic.jmx.Configurator is simply using the iterator of the status manager without synchronizing, as it's documented in BasicStatusManager. So instead of public List<String> getStatuses() { List<String> list = new ArrayList<String>(); Iterator<Status> it = context.getStatusManager().iterator(); while(it.hasNext()) { list.add(it.next().toString()); } return list; } it should probably be public List<String> getStatuses() { List<String> list = new ArrayList<String>(); StatusManager sm = context.getStatusManager(); Iterator<Status> it = sm.iterator(); synchronized(sm) { while(it.hasNext()) { list.add(it.next().toString()); } } return list; }

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