FULL PRODUCT VERSION :

C:\javastudy\scjp\src\ch07>java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)



ADDITIONAL OS VERSION INFORMATION :
Windows 10

A DESCRIPTION OF THE PROBLEM :
When invoking java.util.stream.Stream.reduce(U identity,
             BiFunction<U,? super T,U> accumulator,
             BinaryOperator<U> combiner) method with a wrapper class object(Integer, Double,...) as the parameter for identity, an assertionerror is thrown by the compiler. Identity when passed with other objects such as String does not throw assertionerror.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expected it to compile with no problems.
ACTUAL -

An exception has occurred in the compiler (1.8.0_45). 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.AssertionError: attribution shouldn't be happening here
        at com.sun.tools.javac.util.Assert.error(Assert.java:133)
        at com.sun.tools.javac.util.Assert.check(Assert.java:94)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrNode.process(DeferredAttr.java:591)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrContext.complete(DeferredAttr.java:479)
        at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:182)
        at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:567)
        at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:604)
        at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3797)
        at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3584)
        at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3491)
        at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3470)
        at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3457)
        at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3339)
        at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1806)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        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:1003)
        at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:829)
        at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:734)
        at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:838)
        at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:579)
        at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1441)
        at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1628)
        at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1699)
        at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1672)
        at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2425)
        at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3084)
        at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3335)
        at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2422)
        at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2416)
        at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3364)
        at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3246)
        at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1806)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:615)
        at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1574)
        at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:651)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1105)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:994)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4330)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4240)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4169)
        at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4144)
        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)



ERROR MESSAGES/STACK TRACES THAT OCCUR :

An exception has occurred in the compiler (1.8.0_45). 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.AssertionError: attribution shouldn't be happening here
        at com.sun.tools.javac.util.Assert.error(Assert.java:133)
        at com.sun.tools.javac.util.Assert.check(Assert.java:94)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrNode.process(DeferredAttr.java:591)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrContext.complete(DeferredAttr.java:479)
        at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:182)
        at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:567)
        at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:604)
        at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3797)
        at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3584)
        at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3491)
        at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3470)
        at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3457)
        at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3339)
        at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1806)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        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:1003)
        at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:829)
        at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:734)
        at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:838)
        at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:579)
        at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1441)
        at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1628)
        at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1699)
        at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1672)
        at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2425)
        at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3084)
        at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3335)
        at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2422)
        at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2416)
        at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3364)
        at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3246)
        at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1806)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:615)
        at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1574)
        at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:651)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1105)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:994)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4330)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4240)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4169)
        at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4144)
        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.stream.*;
import static java.util.stream.Collectors.*;
import java.util.function.*;
public class CollectorsTest{
public static void main(String[] args){
System.out.println(Stream.of(args).map(Integer::new).reduce(new Integer(1),(a,b)->a+b,(a,b)->a+b));
}
}
---------- END SOURCE ----------