Nicolas Toublanc created HTTPCLIENT-1915:
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             Summary: httpClient.execute not thread-safe with redirectLocations
                 Key: HTTPCLIENT-1915
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1915
             Project: HttpComponents HttpClient
          Issue Type: Bug
          Components: HttpClient (classic)
    Affects Versions: 4.5.2
         Environment: docker tomcat:7.0.72 (JRE 7)
            Reporter: Nicolas Toublanc


Sometimes, with 2 simultaneous httpClient.execute, I got the following error:
{code:java}
java.util.ConcurrentModificationException: null at 
java.util.AbstractList$Itr.remove(AbstractList.java:380) at 
java.util.AbstractList.removeRange(AbstractList.java:571) at 
java.util.AbstractList.clear(AbstractList.java:234) at 
org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:102) at 
org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
 at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
 at {code}
The cause is redirectLocations collection (in RedirectExec.execute) not being 
thread-safe:**
{code:java}
  final List<URI> redirectLocations = context.getRedirectLocations();
        if (redirectLocations != null) {
            redirectLocations.clear();
        }{code}
I can't figure where this collection is created.



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