[seam-issues] [JBoss JIRA] Created: (JBSEAM-4646) ConcurrentModificationException in RewriterFilter

[alberto Gori (JIRA)]

ConcurrentModificationException  in RewriterFilter
--------------------------------------------------

                 Key: JBSEAM-4646
                 URL: https://jira.jboss.org/jira/browse/JBSEAM-4646
             Project: Seam
          Issue Type: Bug
    Affects Versions: 2.2.0.GA
         Environment: Glassfish V3, Jdk1.6, windows XP SP3.
            Reporter: alberto Gori
             Fix For: 2.2.0.GA


Running long stress test I get this exception:


java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
	at org.jboss.seam.web.RewriteFilter.getAllPatterns(RewriteFilter.java:133)
	at org.jboss.seam.web.RewriteFilter.doFilter(RewriteFilter.java:48)
...

Looking at the Seam code I can see the problem:

Collection<String> ids = pages.getKnownViewIds();

for (String id: ids) {    << line 133!
..            
}

In fact the backed map is synchronized, but you can't iterate over a synchronized map without perfoming necessary synchronization operations:
http://java.sun.com/javase/6/docs/api/java/util/Collections.html#synchronizedMap(java.util.Map)


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