Markus Thies created HTTPCORE-316:
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Summary: 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
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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