FULL PRODUCT VERSION :
javac 1.8.0_31


ADDITIONAL OS VERSION INFORMATION :
Linux lyre 3.16.0-30-generic #40-Ubuntu SMP Mon Jan 12 22:06:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
Compiler bugs

REGRESSION. Last worked in version 8u31


ERROR MESSAGES/STACK TRACES THAT OCCUR :
javac TestReduction3.java

An exception has occurred in the compiler (1.8.0_31). 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.code.Types.isConvertible(Types.java:290)
at com.sun.tools.javac.comp.Check.assertConvertible(Check.java:922)
at com.sun.tools.javac.comp.Check.checkMethod(Check.java:876)
at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3838)
at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3615)
at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3522)
at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3501)
at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3488)
at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3370)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1843)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:386)
at com.sun.tools.javac.comp.DeferredAttr$2.complete(DeferredAttr.java:279)
at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:245)
at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:232)
at com.sun.tools.javac.comp.Resolve$MethodResultInfo.check(Resolve.java:993)
at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:826)
at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:731)
at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:835)
at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:576)
at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1431)
at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1618)
at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1689)
at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1662)
at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2415)
at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3074)
at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3325)
at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2412)
at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2406)
at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3395)
at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3281)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1843)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:656)
at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1611)
at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692)
at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1035)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4342)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4252)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4181)
at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4156)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
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)




javac TestReduce3.java && java Test
An exception has occurred in the compiler (1.8.0_31). 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.code.Types.isConvertible(Types.java:290)
at com.sun.tools.javac.comp.Check.assertConvertible(Check.java:922)
at com.sun.tools.javac.comp.Check.checkMethod(Check.java:876)
at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3838)
at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3615)
at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3522)
at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3501)
at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3488)
at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3370)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1843)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:386)
at com.sun.tools.javac.comp.DeferredAttr$2.complete(DeferredAttr.java:279)
at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:245)
at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:232)
at com.sun.tools.javac.comp.Resolve$MethodResultInfo.check(Resolve.java:993)
at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:826)
at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:731)
at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:835)
at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:576)
at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1431)
at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1618)
at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1689)
at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1662)
at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2415)
at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3074)
at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3325)
at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2412)
at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2406)
at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3395)
at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3281)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1843)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:656)
at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1611)
at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692)
at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1035)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4342)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4252)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4181)
at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4156)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
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:56)
at com.sun.tools.javac.Main.main(Main.java:42)


at com.sun.tools.javac.Main.compile(Main.java:56)
at com.sun.tools.javac.Main.main(Main.java:42)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.stream.*;
import java.util.*;

class Point {
    private double x, y;

    public Point (double x, double y) {
this.x = x;
this.y = y;
    }

    public double getX() { return x; }
    public double getY() { return y; }

    public double distance(Point p) {
return Math.sqrt((this.x - p.x) * (this.x - p.x) + (this.y - p.y) * (this.y - p.y));
    }

    public double distance() {
return Math.sqrt(this.x * this.x + this.y * this.y);
    }

    public String toString() {
return "(" + x + ":"+ y + ")";
    }
}

class Test {

    public static void main(String [] args) {
Collection<Point> c = Arrays.asList(new Point(1.0, 0.1));

System.out.println("------- 1 ---------------");
System.out.println(c.stream()
.reduce(0.0, (s, p) -> s+=p.distance(), (d1, d2) -> 0));
    }
}

---------- END SOURCE ----------