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Created attachment 155208 [details] messages.log as pointed to by error message It hangs and crashes when trying to load JS libraries from whatever remote CDN you have embedded for it. The stacktrace I get comes at line 1226 of the messages.log it told me to send you.
It would probably needs heap dump for solving this issue, but web.clientproject belongs to HTML Project. java.lang.OutOfMemoryError: GC overhead limit exceeded at java.util.Arrays.copyOf(Arrays.java:2367) at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130) at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114) at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415) at java.lang.StringBuilder.append(StringBuilder.java:132) at org.netbeans.modules.web.clientproject.libraries.CDNJSLibrariesProvider.getFiles(CDNJSLibrariesProvider.java:378) at org.netbeans.modules.web.clientproject.libraries.CDNJSLibrariesProvider.createLibrary(CDNJSLibrariesProvider.java:366) at org.netbeans.modules.web.clientproject.libraries.CDNJSLibrariesProvider.readLibraries(CDNJSLibrariesProvider.java:220) at org.netbeans.modules.web.clientproject.libraries.CDNJSLibrariesProvider.getLibraries(CDNJSLibrariesProvider.java:118) at org.netbeans.modules.web.clientproject.api.WebClientLibraryManager.addLibraries(WebClientLibraryManager.java:311) at org.netbeans.modules.web.clientproject.api.WebClientLibraryManager.getLibraries(WebClientLibraryManager.java:219) at org.netbeans.modules.web.clientproject.api.jslibs.JavaScriptLibrarySelectionPanel$LibrariesTableModel$1.run(JavaScriptLibrarySelectionPanel.java:1257) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
*** This bug has been marked as a duplicate of bug 249165 ***