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Build: NetBeans IDE 8.0 (Build 201403101706) VM: Java HotSpot(TM) Client VM, 25.31-b07, Java(TM) SE Runtime Environment, 1.8.0_31-b13 OS: Windows 7 User Comments: GUEST: A simple Clean and Build of a maven project. klawson88: Using the "instanceof" operator on an exception caught in a multicatch block made to catch two exceptions which have a "cousin first removed" relationship causes this error, which prevents the IDE from providing assistive features such as autocomplete, and error highlighting. Problematic code snippet (WriteTimeoutException is a child of QueryTimeoutException, which, along with UnavailableException and TruncateException (not seen here), is a child of QueryExcecutionException (also not seen here)): package wiki.nouns.actions; import com.datastax.driver.core.exceptions.UnavailableException; import com.datastax.driver.core.exceptions.WriteTimeoutException; /** * * @author */ public class TestAction { public void test(Exception e) { try { } catch(WriteTimeoutException | UnavailableException rr) { if(rr instanceof WriteTimeoutException) { } juansmolano: It took me a while to figure this out. Only happens on NEtBeans 7.4 (Mac and Linux) on a managedBean althought netbeans recomend to use multi catch with pipes (Ex1 | Ex2 | ...) all help from netbeans (tips, autocomplete, etc) just stops when using this type of multi catch. my concrete implementation was: try{ .... }catch(EmptyActiveServiceListException | ServiceProviderParameterNotFoundException | NotSupportedServiceException | IncorrectPinCodeException | InsufficientBalanceException | BusinessUnitAssociatedServiceNotFoundException | EnumTypeNotAllowedException ex){ messageTools.displayMessage(FacesMessage.SEVERITY_ERROR, ((UserVisibleException) ex).getExMsgKey(), null); } And everything comes to normal when replaced by: try{ .... } catch (Exception ex) { messageTools.displayMessage(FacesMessage.SEVERITY_ERROR, ((UserVisibleException) ex).getExMsgKey(), null); } GUEST: Occurs after restart and after cleaning the cache. juansmolano: Installed NEtBeans 7.4 Full Bundle on Mac OS X without importing setting from NetBeans 7.3 and then Open an Enterprise App compose of 10+ EJBs and 1 WAR GUEST: Error always happen for this class. Also If I cleared cache. Stacktrace: java.lang.ClassCastException: com.sun.tools.javac.code.Type$UnionClassType cannot be cast to com.sun.tools.javac.code.Type$IntersectionClassType at com.sun.tools.javac.code.Types$10.visitClassType(Types.java:1544) at com.sun.tools.javac.code.Types$10.visitClassType(Types.java:1503) at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:763) at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4430) at com.sun.tools.javac.code.Types.isCastable(Types.java:1494) at com.sun.tools.javac.comp.Check.checkCastable(Check.java:572)
Created attachment 158480 [details] stacktrace