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This bug was originally marked as duplicate of bug 199177, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 20170814-6284493e63d3) VM: Java HotSpot(TM) 64-Bit Server VM, 25.151-b12, Java(TM) SE Runtime Environment, 1.8.0_151-b12 OS: Linux User Comments: jglick: Classpath scanning. Stacktrace: java.lang.AssertionError at com.sun.tools.javac.util.Assert.error(Assert.java:155) at com.sun.tools.javac.util.Assert.check(Assert.java:46) at com.sun.tools.javac.code.Types.merge(Types.java:3778) at com.sun.tools.javac.code.Types.intersect(Types.java:3707) at com.sun.tools.javac.code.Types.lub(Types.java:3936) at com.sun.tools.javac.comp.Infer.getParameterizedSupers(Infer.java:1150)
Created attachment 165566 [details] stacktrace