Hi everybody,

in a rather large test environment, I'm facing the following error:

2015/04/24 16:44:47 ERROR - jmeter.samplers.SampleResult: sampleEnd called 
twice java.lang.Throwable: Invalid call sequence
    at org.apache.jmeter.samplers.SampleResult.sampleEnd(SampleResult.java:1064)
    at 
org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:421)
    at 
org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
    at 
org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1146)
    at 
org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1135)
    at 
org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:434)
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)
    at java.lang.Thread.run(Unknown Source)

in the sample result field, I get the following message:
    Non HTTP response code: java.lang.IllegalArgumentException

_Environment information:_
- Jmeter 2.13, r1665067
- distributed environment, 4 slaves, with Windows 2012: the error is evenly 
distributed
- the master just harvests results, non GUI mode
- JVM:
    java version "1.7.0_55"
    Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
    Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)

Other info:

 *      this does *not* happen when running a single thread
 *      this happens only on a specific sampler, error rate is around 10%
 *      the sampler is a pretty simple HTTPS GET operation, Http4 client 
implementation
 *      I also get several other errors, like 503 and connection exception: 
global error rate is around 1%

The last info brings me to guess that  this is induced by a server-side error, 
however I cannot guess what is going on.
Unfortunately, the test is reserved and I cannot share the script and login 
information.

Any though? suggestions? other possible tests to do?

Thank you in advance, best regards

Sergio


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