Java bytecode LocalVariableTable contains duplicate entry for a single local variable - java-bytecode-asm

Question

Here is my sample java code.
package com.test;
import javax.servlet.http.HttpServletRequest;
public class TestASMIns
{
public void process(HttpServletRequest request)
{
String userName;
if(request.getParameterMap().containsKey("username"))
{
userName = request.getParameter("username");
}
else
{
userName = "UNKNOWN";
}
System.out.println(userName);
}
}
In above example local variable userName declared inside of method body. AFAIK bytecode instruction for above code should contain only one LocalVariableNode for variable 'userName'(Since it is not declared within any inner scope/block). But bytecode instruction for LocalVariableTable contains duplicate entry for variable 'userName'. Can someone shed some light on this.
Here is the bytecode instructions: (generated using javap)
public void process(javax.servlet.http.HttpServletRequest);
descriptor: (Ljavax/servlet/http/HttpServletRequest;)V
flags: ACC_PUBLIC
Code:
stack=2, locals=3, args_size=2
0: aload_1
1: invokeinterface #16, 1 // InterfaceMethod javax/servlet/http/HttpServletRequest.getParameterMap:()Ljava/util/Map;
6: ldc #22 // String username
8: invokeinterface #24, 2 // InterfaceMethod java/util/Map.containsKey:(Ljava/lang/Object;)Z
13: ifeq 28
16: aload_1
17: ldc #22 // String username
19: invokeinterface #30, 2 // InterfaceMethod javax/servlet/http/HttpServletRequest.getParameter:(Ljava/lang/String;)Ljava/lang/String;
24: astore_2
25: goto 31
28: ldc #34 // String UNKNOWN
30: astore_2
31: getstatic #36 // Field java/lang/System.out:Ljava/io/PrintStream;
34: aload_2
35: invokevirtual #42 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
38: return
LineNumberTable:
line 10: 0
line 12: 16
line 13: 25
line 16: 28
line 18: 31
line 19: 38
LocalVariableTable:
Start Length Slot Name Signature
0 39 0 this Lcom/test/TestASMIns;
0 39 1 request Ljavax/servlet/http/HttpServletRequest;
25 3 2 userName Ljava/lang/String;
31 8 2 userName Ljava/lang/String;
StackMapTable: number_of_entries = 2
frame_type = 28 /* same */
frame_type = 252 /* append */
offset_delta = 2
locals = [ class java/lang/String ]
}