The fix for issue JDK-5043030 is incorrect. The generated code for reflection still allocates objects. It even makes the situation worse in cases when primitive wrapper classes' valueOf() allocates new instance. In such case the code allocates two objects. The fix for JDK-5043030 replaced invocation of constructor method with invocation of valueOf(), but it failed to remove actual object allocation. Take a look at the current bytecode of 'invoke' method below:

{
  public java.lang.Object invoke(java.lang.Object, java.lang.Object[]) throws java.lang.reflect.InvocationTargetException;
    descriptor: (Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
    flags: ACC_PUBLIC
    Code:
      stack=7, locals=3, args_size=3
         0: new #99 // class java/lang/Long
         3: dup
         4: aload_1
         5: ifnonnull 16
         8: new #18 // class java/lang/NullPointerException
        11: dup
        12: invokespecial #26 // Method java/lang/NullPointerException."<init>":()V
        15: athrow
        16: aload_1
        17: checkcast #6 // class java/lang/management/ThreadInfo
        20: aload_2
        21: ifnull 40
        24: aload_2
        25: arraylength
        26: sipush 0
        29: if_icmpeq 40
        32: new #20 // class java/lang/IllegalArgumentException
        35: dup
        36: invokespecial #27 // Method java/lang/IllegalArgumentException."<init>":()V
        39: athrow
        40: invokevirtual #10 // Method java/lang/management/ThreadInfo.getBlockedCount:()J
        43: invokestatic #102 // Method java/lang/Long.valueOf:(J)Ljava/lang/Long;
        46: areturn
        47: invokespecial #40 // Method java/lang/Object.toString:()Ljava/lang/String;
        50: new #20 // class java/lang/IllegalArgumentException
        53: dup_x1
        54: swap
        55: invokespecial #30 // Method java/lang/IllegalArgumentException."<init>":(Ljava/lang/String;)V
        58: athrow
        59: new #22 // class java/lang/reflect/InvocationTargetException
        62: dup_x1
        63: swap
        64: invokespecial #33 // Method java/lang/reflect/InvocationTargetException."<init>":(Ljava/lang/Throwable;)V
        67: athrow
      Exception table:
         from to target type
            16 40 47 Class java/lang/ClassCastException
            16 40 47 Class java/lang/NullPointerException
            40 43 59 Class java/lang/Throwable
    Exceptions:
      throws java.lang.reflect.InvocationTargetException


The first bytecode instruction allocates instance of java.lang.Long, which is not used and return value of java.lang.Long.valueOf() is used (at offset 43).