Build: NetBeans IDE Dev (Build 20171026-unknown-revn)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.152-b16, Java(TM) SE Runtime Environment, 1.8.0_152-b16
OS: Mac OS X

User Comments:
dtrebbien: Starting from this code:
package hintstest;

import java.util.function.Consumer;

public interface Test2 {
    Consumer<CharSequence> CONSUMER = new Consumer<CharSequence>() {
        @Override
        public void accept(CharSequence cs) {
            final String str = (String) cs;
            System.out.println(str.length());
        }
    };
}

I had just selected '(CharSequence cs) {' and deleted, ending up with the erroneous code:
package hintstest;

import java.util.function.Consumer;

public interface Test2 {
    Consumer<CharSequence> CONSUMER = new Consumer<CharSequence>() {
        @Override
        public void accept
            final String str = (String) cs;
            System.out.println(str.length());
        }
    };
}

GUEST: I was typing




Stacktrace: 
java.lang.NullPointerException
   at com.sun.source.util.TreePath.<init>(TreePath.java:111)
   at org.netbeans.lib.nbjavac.services.NBJavadocMemberEnter.visitMethodDef(NBJavadocMemberEnter.java:71)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:872)
   at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:171)
   at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:183)
   at com.sun.tools.javac.comp.MemberEnter.visitErroneous(MemberEnter.java:611)