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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HTTPCORE-316) HeaderGroup clone removes headers from original
Date Sun, 14 Oct 2012 12:07:03 GMT

     [ https://issues.apache.org/jira/browse/HTTPCORE-316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Oleg Kalnichevski resolved HTTPCORE-316.

       Resolution: Fixed
    Fix Version/s: 4.2.3

Good catch. Thank you, Markus. Fixed committed to both trunk and 4.2.x branch.

> HeaderGroup clone removes headers from original
> -----------------------------------------------
>                 Key: HTTPCORE-316
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-316
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore
>    Affects Versions: 4.2.2
>         Environment: All platforms
>            Reporter: Markus Thies
>              Labels: HeaderGroup, patch
>             Fix For: 4.2.3
>   Original Estimate: 2h
>  Remaining Estimate: 2h
> The class org.apache.http.message.HeaderGroup  provides a method clone().
> If clone is called the original object's headers are removed.
> The root cause of this is, that the class HeaderGroup has only one attribute (headers)
which is a List.
> As clone does a shallow copy the List is not cloned (that is correct).
> But within the method clone(), the headers of the newly created clone are removed (by
calling clear()) but they actually also clear the headers of the original object (since it
is not a copy).
> So this leads to very tricky problems in code where the headers are essential to be available
in the clone and in the original object.
> Original code:
>     public Object clone() throws CloneNotSupportedException {
>         HeaderGroup clone = (HeaderGroup) super.clone();
>         clone.headers.clear();
>         clone.headers.addAll(this.headers);
>         return clone;
>     }
> Corrected code:
>     public Object clone() throws CloneNotSupportedException {
>         HeaderGroup clone = (HeaderGroup) super.clone();
>         //BUG: would also clear the headers original 
>         //clone.headers.clear();
>         //clone.headers.addAll(this.headers);
>         return clone;
>     }

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