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java.lang.NullPointerException at com.sun.tools.javac.comp.Attr.check(Attr.java:231) at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2622) at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1777) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637) at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2633) at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1777) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637) at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:676) at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1165) at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:926) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:707) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:731) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1213) at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:707) at com.sun.tools.javac.comp.Attr.attribStatToTree(Attr.java:412) at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:979) at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:938) at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:797) at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:157) at org.netbeans.modules.refactoring.java.RefactoringUtils.variableClashes(RefactoringUtils.java:977) at org.netbeans.modules.refactoring.java.plugins.RenameRefactoringPlugin.fastCheckParameters(RenameRefactoringPlugin.java:362) To reproduce, run org.netbeans.modules.refactoring.java.test.RenameTest, testcase test238268 Reproduced in trunk, but it is likely to be present in 8.2 too.