title: JMeter java.net.SocketException: Socket closed
body: <p>I'm developing a JMeter script for an ajax dashboard. The user logs in, navigates to a repository, clicks on the dashboard link, waits for the dashboard to display, and then logs out. </p>
  
  <p>The dashboard has five dashlets. I've come to a point in the script where there are five pairs of samplers, one for each dashlet. The first sampler in each pair has a POST REST request with with ajax in the body. There is a regular expression extractor that extracts an id from the body of the response. This id is added to the URL in the second sampler of the pair, which also has a POST REST request with ajax in the body.</p>
  
  <p>When there are one or two pairs of these samplers the script works 100% of the time, executing the samplers returning HTTP 200 responses and correctly substituting the id extracted from the first sampler in each pair, then logging out in the final sampler (exit.html). When the third pair of samplers are added I get the SocketException about once every 10-15 executions. With four pairs enabled it happens much more frequently, and with the fifth pair enabled it happens 100% of the time. </p>
  
  <p>The odd thing is the SocketException occurs in the logout sampler, no other sampler. Also, if the logout sampler is disabled the socket exception never occurs, it works 100% of the time.</p>
  
  <p>Here's the full stack trace:</p>
  
  <pre><code>java.net.SocketException: Socket closed
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
  at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1676)
  at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1674)
  at java.security.AccessController.doPrivileged(Native Method)
  at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1672)
  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1245)
  at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
  at org.apache.jmeter.protocol.http.sampler.HTTPJavaImpl.readResponse(HTTPJavaImpl.java:258)
  at org.apache.jmeter.protocol.http.sampler.HTTPJavaImpl.sample(HTTPJavaImpl.java:514)
  at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
  at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.followRedirects(HTTPSamplerBase.java:1486)
  at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.resultProcessing(HTTPSamplerBase.java:1561)
  at org.apache.jmeter.protocol.http.sampler.HTTPAbstractImpl.resultProcessing(HTTPAbstractImpl.java:338)
  at org.apache.jmeter.protocol.http.sampler.HTTPJavaImpl.sample(HTTPJavaImpl.java:588)
  at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
  at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1141)
  at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1130)
  at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:431)
  at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:258)
  at java.lang.Thread.run(Thread.java:745)
  Caused by: java.net.SocketException: Socket closed
  at java.net.SocketInputStream.socketRead0(Native Method)
  at java.net.SocketInputStream.read(SocketInputStream.java:152)
  at java.net.SocketInputStream.read(SocketInputStream.java:122)
  at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
  at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
  at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
  at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:689)
  at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1324)
  at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2691)
  at java.net.URLConnection.getHeaderFieldLong(URLConnection.java:639)
  at java.net.URLConnection.getContentLengthLong(URLConnection.java:511)
  at java.net.URLConnection.getContentLength(URLConnection.java:495)
  at org.apache.jmeter.protocol.http.sampler.HTTPJavaImpl.readResponse(HTTPJavaImpl.java:224)
  ... 12 more
  </code></pre>
  
  <p>I would appreciate any help debugging this</p>