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This bug was originally marked as duplicate of bug 252914, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 (Build 201510222201) VM: OpenJDK 64-Bit Server VM, 25.91-b14, OpenJDK Runtime Environment, 1.8.0_91-8u91-b14-0ubuntu4~16.04.1-b14 OS: Linux User Comments: bazi: Can not use "implement interface" action. Stacktrace: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at com.sun.tools.javac.util.List.get(List.java:475) at org.netbeans.modules.java.hints.suggestions.CreateSubclass$CreateSubclassFix$1$2.run(CreateSubclass.java:242) at org.netbeans.modules.java.hints.suggestions.CreateSubclass$CreateSubclassFix$1$2.run(CreateSubclass.java:220) at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:636) at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:626) at org.netbeans.modules.java.source.parsing.MimeTask.run(MimeTask.java:83)
Created attachment 160035 [details] stacktrace