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

ConcurrentModificationException in RewriterFilter -------------------------------------------------- Key: JBSEAM-4646 URL: https://issues.jboss.org/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 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#synchron...