Bug ID: JDK-8044546 Crash on faulty reduce/lambda

JDK-8044546 : Crash on faulty reduce/lambda

Type: Bug
Component: tools
Sub-Component: javac
Affected Version: 8u5,9

Priority: P3
Status: Closed
Resolution: Fixed
OS: linux
CPU: x86_64

Submitted: 2014-05-30
Updated: 2015-03-27
Resolved: 2014-06-23

Versions (Unresolved/Resolved/Fixed)

The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

To download the current JDK release, click here.

JDK 8	JDK 9
8u40Fixed	9 b22Fixed

Related Reports

Duplicate :	JDK-8065424 - Compiler Error
Duplicate :	JDK-8066549 - Crash on faulty reduce/lambda
Duplicate :	JDK-8046357 - Shen.java : NullPointerException from sun.tools.javac.code.Types.isConvertible
Duplicate :	JDK-8035761 - javac, assertion error while accessing a member of a wildcard site during overload resolution
Duplicate :	JDK-8062253 - NullPointerException in com.sun.tools.javac.code.Types.isConvertible
Duplicate :	JDK-8074533 - Internal compiler error in the compiler for stream reduce operation
Duplicate :	JDK-8074466 - NullPointerException in compiler with stream().reduce
Duplicate :	JDK-8073870 - Javac crash when compiliing type-inferred lambdas in reduce()
Duplicate :	JDK-8073703 - NullPointerException in javac compiling simple expression with reduce()
Duplicate :	JDK-8073660 - Unable to compile Java source file with parallelStream support
Duplicate :	JDK-8068956 - Internal compiler error
Duplicate :	JDK-8066093 - NullPointerException while trying to build project in Intellij IDEA 13.1.5
Duplicate :	JDK-8065315 - javac throws NPE
Duplicate :	JDK-8076143 - NPE at compilation time
Duplicate :	JDK-8067849 - NPE in com.sun.tools.javac.comp.TransTypes.visitVarDef
Relates :	JDK-8030741 - Inference: implement eager resolution of return types, consistent with JDK-8028800
Relates :	JDK-8066980 - NPE on inferring on Stream.reduce
Relates :	JDK-8033718 - Inference ignores capture variable as upper bound
Relates :	JDK-8067849 - NPE in com.sun.tools.javac.comp.TransTypes.visitVarDef
Relates :	JDK-8047797 - Incorrect error: incompatible types: cannot infer type-variable(s) T#1,CAP#1,T#2

Description

FULL PRODUCT VERSION :
java version "1.8.0_20-ea"
Java(TM) SE Runtime Environment (build 1.8.0_20-ea-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b15, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux localhost 3.14.4-1-ARCH #1 SMP PREEMPT Tue May 13 16:41:39 CEST 2014 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
The compiler throws a NPE when it tries to compile my class containing the following line of code, which is likely malformed:
"return Arrays.stream(data).reduce(true, (a,b) -> a && b.length == len, (a,b) -> true);".
After commenting it out, it compiles just fine.

The stacktrace is:
java.lang.NullPointerException
	at com.sun.tools.javac.code.Types.isConvertible(Types.java:294)
	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:3818)
	at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3595)
	at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3502)
	at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3481)
	at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3468)
	at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3350)
	at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1836)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:1697)
	at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1384)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:669)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:685)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1135)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:669)
	at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1028)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:669)
	at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4322)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4232)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4161)
	at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4136)
	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)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a new class.
Create a new method in this class, which returns a boolean and takes an array argument.called "data".
Paste the following line in the method body: "return Arrays.stream(data).reduce(true, (a,b) -> a && b.length == len, (a,b) -> true);"
Try to compile the class

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
An error message telling me why the code is malformed or successful compilation of the class if it isn't malformed.
ACTUAL -
A Null-Pointer Exception:


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException
	at com.sun.tools.javac.code.Types.isConvertible(Types.java:294)
	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:3818)
	at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3595)
	at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3502)
	at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3481)
	at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3468)
	at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3350)
	at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1836)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:1697)
	at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1384)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:669)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:685)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1135)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:669)
	at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1028)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:600)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:669)
	at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4322)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4232)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4161)
	at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4136)
	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)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Arrays;                                                                                                              
                                                                                                                                      
public class Test                                                                                                                     
{                                                                                                                                     
        public boolean asd(Object[] data)                                                                                             
        {                                                                                                                             
                return Arrays.stream(data).reduce(true, (a,b) -> a && b.length == len, (a,b) -> true);                                
        }                                                                                                                             
}  
---------- END SOURCE ----------

Comments

regression introduced by JDK-8030741

11-06-2014

I think that this is a minimal, self contained test case: abstract class Test { boolean foo() { return bar(true, a -> {}); } abstract <T1> T1 bar(T1 t1, S<T1> s); } interface S<S1> { void baz(S1 s1); }

10-06-2014

This failure is reproducible with 9 java -version java version "1.9.0-ea" Java(TM) SE Runtime Environment (build 1.9.0-ea-b15) Java HotSpot(TM) 64-Bit Server VM (build 1.9.0-ea-b15, mixed mode)

02-06-2014