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https://issues.apache.org/jira/browse/HTTPCLIENT-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439445#comment-16439445
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Nicolas Toublanc commented on HTTPCLIENT-1915:
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Yes, we are sharing the same HttpContext between concurrent requests...
We will fix it, thanks!
> 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
> Priority: Major
>
> 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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