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From "Thomas Neidhart (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-754) embedded objects are not toString-ed like top-level objects
Date Fri, 24 Feb 2012 20:13:48 GMT

    [ https://issues.apache.org/jira/browse/LANG-754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215870#comment-13215870
] 

Thomas Neidhart commented on LANG-754:
--------------------------------------

I digged into this problem and the problem you describe occurs only when using setUseShortName(true),
and the class is located in the default package and the name is one of [IZFJSBDC], explanation
follows.

The ToStringStyle uses ClassUtils to get the short name for the class, which uses an internal
reverse abbreviation map to resolve primitive array types which are something like [B for
a byte[]. Now there seems to be a bug in the ClassUtils.getShortName method as it does this
reverse resolve all the time, and if you happen to have a class called B in the default package,
it is wrongly identified as byte.

So the fix would be to do the reverse lookup only in case of arrays.
                
> embedded objects are not toString-ed like top-level objects
> -----------------------------------------------------------
>
>                 Key: LANG-754
>                 URL: https://issues.apache.org/jira/browse/LANG-754
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.builder.*
>    Affects Versions: 2.5, 3.0.1
>         Environment: Linux Ubuntu
> java version "1.6.0_24"
> Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
> Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
>            Reporter: Dominique De Vito
>            Priority: Minor
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> I have a simple class 'A' defined as follows:
> ======================================
> public class A {
>   int p1;
>   String p2;
>   B b;
> }
> ======================================
> While I execute the following instructions:
> ToStringBuilder builder = new ReflectionToStringBuilder(a);
> System.out.println(builder.toString());
> The output is:
> A@3ea981ca[p1=0,p2=<null>,b=B@1ee7b241]
> that's normal, without recursion
> So, I defined my own style, for recursive toString-ing display:
> ======================================
> class MyStyle extends ToStringStyle {
>   private final static ToStringStyle instance = new MyStyle();
>   public MyStyle() {
>     setArrayContentDetail(true);
>     setUseShortClassName(true);
>     setUseClassName(true);
>     setUseIdentityHashCode(true);
>     setFieldSeparator(", ");
>   }
>   public static ToStringStyle getInstance() {
>     return instance;
>   };
>   @Override
>   public void appendDetail(final StringBuffer buffer, final String fieldName, final Object
value) {
>     if (!value.getClass().getName().startsWith("java")) {
>       buffer.append(ReflectionToStringBuilder.toString(value, instance));
>     } else {
>       super.appendDetail(buffer, fieldName, value);
>     }
>   }
>   @Override
>   public void appendDetail(final StringBuffer buffer, final String fieldName, final Collection
value) {
>     appendDetail(buffer, fieldName, value.toArray());
>   }
> }
> ======================================
> When I use my custom MyStyle:
> String s = ReflectionToStringBuilder.toString(a, MyStyle.getInstance());
> System.out.println(s);
> The output is:
> A@3ea981ca[p1=0, p2=<null>, b=byte@1ee7b241[p4=234]]
> So, the name of the class 'B' is not displayed.
> I expected something like: b=B@1ee7b241[p4=234]
> Instead, the name of the class 'B' is replaced with 'byte'.
> I don't know why.

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