FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
Nullpoint-Exception during compilation


ERROR MESSAGES/STACK TRACES THAT OCCUR :
javac F.java
An exception has occurred in the compiler (1.8.0_51). 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.MemberEnter.baseEnv(MemberEnter.java:1388)
at com.sun.tools.javac.comp.MemberEnter.complete(MemberEnter.java:1046)
at com.sun.tools.javac.code.Symbol.complete(Symbol.java:574)
at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1037)
at com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:973)
at com.sun.tools.javac.code.Symbol$ClassSymbol.getKind(Symbol.java:1101)
at com.sun.tools.javac.code.Kinds.kindName(Kinds.java:162)
at com.sun.tools.javac.comp.Check.duplicateError(Check.java:329)
at com.sun.tools.javac.comp.Check.checkUnique(Check.java:3435)
at com.sun.tools.javac.comp.Enter.visitTypeParameter(Enter.java:454)
at com.sun.tools.javac.tree.JCTree$JCTypeParameter.accept(JCTree.java:2224)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:258)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:272)
at com.sun.tools.javac.comp.Enter.visitClassDef(Enter.java:418)
at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:693)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:258)
at com.sun.tools.javac.comp.MemberEnter.baseEnv(MemberEnter.java:1388)
at com.sun.tools.javac.comp.MemberEnter.complete(MemberEnter.java:1046)
at com.sun.tools.javac.code.Symbol.complete(Symbol.java:574)
at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1037)
at com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:973)
at com.sun.tools.javac.code.Symbol$ClassSymbol.getKind(Symbol.java:1101)
at com.sun.tools.javac.code.Kinds.kindName(Kinds.java:162)
at com.sun.tools.javac.comp.Check.duplicateError(Check.java:329)
at com.sun.tools.javac.comp.Check.checkUnique(Check.java:3435)
at com.sun.tools.javac.comp.Enter.visitTypeParameter(Enter.java:454)
at com.sun.tools.javac.tree.JCTree$JCTypeParameter.accept(JCTree.java:2224)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:258)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:272)
at com.sun.tools.javac.comp.Enter.visitClassDef(Enter.java:418)
at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:693)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:258)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:272)
at com.sun.tools.javac.comp.Enter.visitTopLevel(Enter.java:334)
at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:518)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:258)
at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:272)
at com.sun.tools.javac.comp.Enter.complete(Enter.java:486)
at com.sun.tools.javac.comp.Enter.main(Enter.java:471)
at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:982)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:857)
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)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
interface alpha_F_m2_1<gamma_n, alpha_n_1, gamma_o, alpha_o_1> {
    gamma_n n(alpha_n_1 x);
    gamma_o o(alpha_o_1 x);
}

interface alpha_F_m3_1<gamma_n, alpha_n_1> {
    gamma_n n(alpha_n_1 x);
}

class F<
        A11 extends R1,
        A12,
        R1 extends R2,
A21 extends alpha_F_m2_1<Gamma_F_m2_1_o,A22,Gamma_F_m2_1_n,sup_A23>,
Gamma_F_m2_1_o extends A12,
Gamma_F_m2_1_n extends A11,
A22,
sup_A23,
A23 extends sup_A23,
R2,
  sup_A33_A32,
  A31 extends alpha_F_m3_1<Gamma_F_m3_1_n,sup_A33_A32>,
  A33 extends sup_A33_A32,
  A32 extends sup_A33_A32,
  Gamma_F_m3_1_n extends A11,
         A32,
  A33,
  R3
> {
    R1 m1(A11 x, A12 y) { return x; }
    R2 m2(A21 x, A22 y, A23 z) { return m1(x.o(z), x.n(y)); }
    R3 m3(A31 x, A32 y, A33 z) { return m1(x.n(z), x.n(y)); }
}
---------- END SOURCE ----------