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Posted to httpclient-users@hc.apache.org by Lalit Sahoo <la...@sonata-software.com> on 2006/11/15 10:56:34 UTC
java.util.ConcurrentModificationException
Hi All,
While using HttpClient in multithreaded environment I am getting following error:
java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
at java.util.AbstractList$Itr.next(AbstractList.java:419)
at org.apache.commons.httpclient.HeaderGroup.getHeaders(HeaderGroup.java:142)
at org.apache.commons.httpclient.HttpMethodBase.addCookieRequestHeader(HttpMethodBase.java:1167)
at org.apache.commons.httpclient.HttpMethodBase.addRequestHeaders(HttpMethodBase.java:1320)
at org.apache.commons.httpclient.methods.ExpectContinueMethod.addRequestHeaders(ExpectContinueMethod.java:184)
at org.apache.commons.httpclient.methods.EntityEnclosingMethod.addRequestHeaders(EntityEnclosingMethod.java:372)
at org.apache.commons.httpclient.HttpMethodBase.writeRequestHeaders(HttpMethodBase.java:2079)
at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:1962)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:994)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:397)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
at ae.cramer.com.httpevaluator.ApacheHTTPClientEvaluator.sendCommand(ApacheHTTPClientEvaluator.java:186)
at ae.cramer.com.httpevaluator.ApacheHTTPClientEvaluator.execute(ApacheHTTPClientEvaluator.java:250)
at ae.cramer.com.test.EvaluationTest.run(EvaluationTest.java:39)
at java.lang.Thread.run(Thread.java:534)
Can anybody help in this regard?
Regards,
Lalit
Re: java.util.ConcurrentModificationException
Posted by Roland Weber <ht...@dubioso.net>.
Hello Lalit,
> While using HttpClient in multithreaded environment I am getting following error:
>
> java.util.ConcurrentModificationException
> at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
> at java.util.AbstractList$Itr.next(AbstractList.java:419)
> at org.apache.commons.httpclient.HeaderGroup.getHeaders(HeaderGroup.java:142)
> at org.apache.commons.httpclient.HttpMethodBase.addCookieRequestHeader(HttpMethodBase.java:1167)
Make sure that each HttpMethod is used by only one thread at a time.
In other words, each thread has to create it's own method.
cheers,
Roland
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RE: java.util.ConcurrentModificationException
Posted by Mark Claassen <mc...@ocie.net>.
Are you familiar with the ConcurrentModificationException? This means that
the underlying java.util.list is changing while an Iterator is being used.
I.E. If you are stepping through something with an Iterator, you can't do
something like List.remove(index) and expect you iterator to continue to
function. Are you doing something like this? If you need to do something
like this, you can use a ListIterator instead of an Iterator and then use
the ListIterator's remove() method.
I haven't had any troubles with my 3.01 version, so I am guessing that maybe
you are manipulating this somehow?
Mark
-----Original Message-----
From: Lalit Sahoo [mailto:lalit.s@sonata-software.com]
Sent: Wednesday, November 15, 2006 4:57 AM
To: Httpclientusergroup (E-mail)
Subject: java.util.ConcurrentModificationException
Hi All,
While using HttpClient in multithreaded environment I am getting following
error:
java.util.ConcurrentModificationException
at
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
at java.util.AbstractList$Itr.next(AbstractList.java:419)
at
org.apache.commons.httpclient.HeaderGroup.getHeaders(HeaderGroup.java:142)
at
org.apache.commons.httpclient.HttpMethodBase.addCookieRequestHeader(HttpMeth
odBase.java:1167)
at
org.apache.commons.httpclient.HttpMethodBase.addRequestHeaders(HttpMethodBas
e.java:1320)
at
org.apache.commons.httpclient.methods.ExpectContinueMethod.addRequestHeaders
(ExpectContinueMethod.java:184)
at
org.apache.commons.httpclient.methods.EntityEnclosingMethod.addRequestHeader
s(EntityEnclosingMethod.java:372)
at
org.apache.commons.httpclient.HttpMethodBase.writeRequestHeaders(HttpMethodB
ase.java:2079)
at
org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.jav
a:1962)
at
org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:994
)
at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethod
Director.java:397)
at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDir
ector.java:170)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
at
ae.cramer.com.httpevaluator.ApacheHTTPClientEvaluator.sendCommand(ApacheHTTP
ClientEvaluator.java:186)
at
ae.cramer.com.httpevaluator.ApacheHTTPClientEvaluator.execute(ApacheHTTPClie
ntEvaluator.java:250)
at ae.cramer.com.test.EvaluationTest.run(EvaluationTest.java:39)
at java.lang.Thread.run(Thread.java:534)
Can anybody help in this regard?
Regards,
Lalit
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