$ cat Crash.java

import java.util.*;
import java.util.stream.*;

public class Crash {

    static class ViewId { }

    public void crash() {

        Map<ViewId,String> viewToProfile = null;
        new TreeMap<>(viewToProfile.entrySet().stream()
                      .collect(Collectors.toMap((vid, prn) -> prn,
                                                (vid, prn) -> Arrays.asList(vid),
                                                (a, b) -> { a.addAll(b); return a; })));

    }

}
$ javac Crash.java
An exception has occurred in the compiler (1.8.0-ea). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitIdent(Flow.java:2262)
at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:1999)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.tree.TreeScanner.visitSelect(TreeScanner.java:264)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1892)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1575)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitApply(Flow.java:2139)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.tree.TreeScanner.visitSelect(TreeScanner.java:264)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1892)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1575)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitApply(Flow.java:2139)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.tree.TreeScanner.visitSelect(TreeScanner.java:264)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1892)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1575)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitApply(Flow.java:2139)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1575)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExprs(Flow.java:1585)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitNewClass(Flow.java:2145)
at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1510)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.tree.TreeScanner.visitExec(TreeScanner.java:175)
at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1290)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitBlock(Flow.java:1779)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:903)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitMethodDef(Flow.java:1720)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:772)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitClassDef(Flow.java:1680)
at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:687)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:382)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2307)
at com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2288)
at com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:210)
at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1321)
at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1295)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:900)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:859)
at com.sun.tools.javac.main.Main.compile(Main.java:523)
at com.sun.tools.javac.main.Main.compile(Main.java:381)
at com.sun.tools.javac.main.Main.compile(Main.java:370)
at com.sun.tools.javac.main.Main.compile(Main.java:361)
at com.sun.tools.javac.Main.compile(Main.java:64)
at com.sun.tools.javac.Main.main(Main.java:50)
$ java -version
java version "1.8.0-ea"
Java(TM) SE Runtime Environment (build 1.8.0-ea-b105)
Java HotSpot(TM) Server VM (build 25.0-b47, mixed mode)
$