Fwd: [JBS] {New} (JDK-8222721) [lworld] Javac generates 'Q' arrays for V.box[] and V?[]

[Srikanth]

Hi Tobias,

This does not look like a javac defect to me: Here is the local variable 
table from javap output:

  LocalVariableTable:
         Start  Length  Slot  Name   Signature
             0      77     0  args   [Ljava/lang/String;
             6      71     1  vbox   [LTest$V;
            12      65     2    vq   [LTest$V;

I think the reflection elements are at fault.

Srikanth




-------- Forwarded Message --------
Subject: 	[JBS] {New} (JDK-8222721) [lworld] Javac generates 'Q' arrays 
for V.box[] and V?[]
Date: 	Thu, 18 Apr 2019 07:16:02 +0000 (UTC)
From: 	Tobias Hartmann (JBS) <do-not-reply at openjdk.java.net>
To: 	srikanth.adayapalam at oracle.com



Message Title
	Tobias Hartmann 
<https://bugs.openjdk.java.net/secure/ViewProfile.jspa?name=thartmann> 
*created* an issue

JDK <https://bugs.openjdk.java.net/browse/JDK> / Bug 
<https://bugs.openjdk.java.net/browse/JDK-8222721> JDK-8222721 
<https://bugs.openjdk.java.net/browse/JDK-8222721>
[lworld] Javac generates 'Q' arrays for V.box[] and V?[] 
<https://bugs.openjdk.java.net/browse/JDK-8222721>

Issue Type: 	Bug Bug
Affects Versions: 	repo-valhalla
Assignee: 	Srikanth Adayapalam 
<https://bugs.openjdk.java.net/secure/ViewProfile.jspa?name=sadayapalam>
Components: 	hotspot
Subcomponent: 	compiler
Created: 	2019-04-18 00:15
Priority: 	P2 P2
Reporter: 	Tobias Hartmann 
<https://bugs.openjdk.java.net/secure/ViewProfile.jspa?name=thartmann>

public class Test {

    value class V {
        int f;
        V(int ff) {
          f = ff;
        }
    }

    public static void main(String[] args) {
        V.box[] vbox = new V.box[16];
        V?[] vq = new V?[16];
        System.out.println("V.box="+vbox.getClass().getName()+"; 
"+vbox.getClass().getComponentType().getName());
        System.out.println("V?="+vq.getClass().getName()+"; 
"+vq.getClass().getComponentType().getName());
        vbox[0] = null;
        vq[0] = null;
    }
}

Output:

V.box=[QTest$V;; Test$V
V?=[QTest$V;; Test$V
Exception in thread "main" java.lang.NullPointerException
at Test.main(Test.java:15)

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