Fix for issue #162415 - java.util.ConcurrentModificationException at org.openide.util.WeakSet$WeakSetIterator.checkModcount

diff -r cc7446f2caa0 projectui/src/org/netbeans/modules/project/ui/ProjectsRootNode.java
--- a/projectui/src/org/netbeans/modules/project/ui/ProjectsRootNode.java	Mon Apr 13 02:21:09 2009 +0400
+++ b/projectui/src/org/netbeans/modules/project/ui/ProjectsRootNode.java	Mon Apr 13 10:19:05 2009 +0400
@@ -105,7 +105,7 @@
 public class ProjectsRootNode extends AbstractNode {
 
     private static final Logger LOG = Logger.getLogger(ProjectsRootNode.class.getName());
-    private static final Set<ProjectsRootNode> all = new WeakSet<ProjectsRootNode>();
+    private static final Set<ProjectsRootNode> all = Collections.synchronizedSet(new WeakSet<ProjectsRootNode>());
 
     static final int PHYSICAL_VIEW = 0;
     static final int LOGICAL_VIEW = 1;
@@ -120,7 +120,9 @@
         super( new ProjectChildren( type ) ); 
         setIconBaseWithExtension( ICON_BASE );
         this.type = type;
-        all.add(this);
+        synchronized(all){
+            all.add(this);
+        }
     }
         
     public String getName() {
@@ -202,13 +204,15 @@
     }
 
     static void checkNoLazyNode(Object msg) {
-        for (ProjectsRootNode root : all) {
-            for (Node n : root.getChildren().getNodes()) {
-                if (n.getLookup().lookup(LazyProject.class) != null) {
-                    LogRecord REC = new LogRecord(Level.WARNING, "LazyProjects remain visible:\n {0}"); // NOI18N
-                    REC.setLoggerName(OpenProjectList.LOGGER.getName());
-                    REC.setParameters(new Object[] { msg });
-                    OpenProjectList.log(REC);
+        synchronized(all){
+            for (ProjectsRootNode root : all) {
+                for (Node n : root.getChildren().getNodes()) {
+                    if (n.getLookup().lookup(LazyProject.class) != null) {
+                        LogRecord REC = new LogRecord(Level.WARNING, "LazyProjects remain visible:\n {0}"); // NOI18N
+                        REC.setLoggerName(OpenProjectList.LOGGER.getName());
+                        REC.setParameters(new Object[] { msg });
+                        OpenProjectList.log(REC);
+                    }
                 }
             }
         }