Compiling

Compile with Java 1.8.0_131

javac test/BMHTest.java

Running

Run with Java 1.8.0_131 to reproduce the problem:

java -Djava.lang.invoke.MethodHandle.DUMP_CLASS_FILES=true test.BMHTest 128

The following command would not trigger the problem:

java -Djava.lang.invoke.MethodHandle.DUMP_CLASS_FILES=true test.BMHTest 127

Results

We can see it generates excessive number of BMH classes. Here is the result for a sample run:

ls DUMP_CLASS_FILES/java/lang/invoke/LambdaForm\$BMH*.class | wc -l

1002

Here is a sample disassemble code:

javap -c DUMP_CLASS_FILES/java/lang/invoke/LambdaForm\$BMH123.class

Compiled from "LambdaForm$BMH123"
final class java.lang.invoke.LambdaForm$BMH123 {
  static java.lang.Object reinvoke_123(java.lang.Object, java.lang.Object);
    Code:
       0: ldc           #12                 // String CONSTANT_PLACEHOLDER_0 <<(String)String : BMH.reinvoke_001=Lambda(a0:L/SpeciesData<LL>,a1:L)=>{\n    t2:L=BoundMethodHandle$Species_LL.argL1(a0:L);\n    t3:L=BoundMethodHandle$Species_LL.argL0(a0:L);\n    t4:L=MethodHandle.invokeBasic(t3:L,t2:L,a1:L);t4:L}\n& BMH=[MethodHandle(String,String)String, foo121]>>
       2: checkcast     #14                 // class java/lang/invoke/MethodHandle
       5: astore_0
       6: aload_0
       7: checkcast     #16                 // class java/lang/invoke/BoundMethodHandle$Species_LL
      10: dup
      11: astore_0
      12: getfield      #20                 // Field java/lang/invoke/BoundMethodHandle$Species_LL.argL1:Ljava/lang/Object;
      15: astore_2
      16: aload_0
      17: getfield      #23                 // Field java/lang/invoke/BoundMethodHandle$Species_LL.argL0:Ljava/lang/Object;
      20: astore_3
      21: aload_3
      22: checkcast     #14                 // class java/lang/invoke/MethodHandle
      25: aload_2
      26: aload_1
      27: invokevirtual #26                 // Method java/lang/invoke/MethodHandle.invokeBasic:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
      30: areturn

  static void dummy();
    Code:
       0: ldc           #30                 // String BMH.reinvoke_123=Lambda(a0:L/SpeciesData<LL>,a1:L)=>{\n    t2:L=BoundMethodHandle$Species_LL.argL1(a0:L);\n    t3:L=BoundMethodHandle$Species_LL.argL0(a0:L);\n    t4:L=MethodHandle.invokeBasic(t3:L,t2:L,a1:L);t4:L}
       2: pop
       3: return
}