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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