When the compiler desugars a lambda body to a method, there is no local variable table generated in the classfile.  This prevents debuggers from being able to examine locals when stepping into lambdas.  

For example, for the following class:

class Foo1 {
    public static void x() { 
        int i = 0;
    }
}

there is an LVTable:

public static void x();
    descriptor: ()V
    flags: ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=0
         0: iconst_0      
         1: istore_0      
         2: return        
      LineNumberTable:
        line 3: 0
        line 4: 2
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            2       1     0     i   I

but for 

class Foo2 {
    public static Runnable r = () -> { 
        int i = 0;
    };
}

there is no LVtable:

  private static void lambda$static$0();
    descriptor: ()V
    flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=0
         0: iconst_0      
         1: istore_0      
         2: return        
      LineNumberTable:
        line 1: 0
        line 4: 2