IllegalStateException java httpclient

Question

I am trying to retrieve a text file from the internet using the apache httpclient. I am using the following code:

 HttpClient httpclient = new DefaultHttpClient(); HttpGet getHNMR = new HttpGet("http://www.hmdb.ca/labm/metabolites/" + HMDB + "/chemical/pred_hnmr_peaklist/" + HMDB + "_peaks.txt"); HttpGet getCNMR = new HttpGet("http://www.hmdb.ca/labm/metabolites/" + HMDB + "/chemical/pred_cnmr_peaklist/" + HMDB + "_peaks.txt"); try { responseH = httpclient.execute(getHNMR); responseC = httpclient.execute(getCNMR); } catch (ClientProtocolException e1) { // TODO Auto-generated catch block e1.printStackTrace(); System.out.println("client exception"); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); System.out.println("ioexception"); } //Generate HNMR peak list HttpEntity entityH = responseH.getEntity(); HttpEntity entityC = responseH.getEntity();; try { HNMR = EntityUtils.toString(entityH); CNMR = EntityUtils.toString(entityC); } catch (ParseException e1) { // TODO Auto-generated catch block e1.printStackTrace(); System.out.println("parseexception"); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); System.out.println("ioexception"); } //Set peak lists to textarea HC.setText(CNMR + "\n" + HNMR);

I am getting the following stack trace:

Thread [pool-2-thread-1] (Suspended (exception IllegalStateException)) ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) line: 1128 ThreadPoolExecutor$Worker.run() line: 603 Thread.run() line: 679

I'm not that familiar with debugging, so I'm not sure what's exactly happening.

Did you try to download the files sequentially? I am not sure, whether the HttpClient actually supports this interleaved kind of operation shown in your code. — Dirk
– Dirk, Commented Aug 6, 2012 at 14:52

Reimeus · Accepted Answer · 2012-08-07 00:40:42Z

The response body must be consumed before the connection can be used for another request. You should read the response InputStream fully prior to the next HTTP execute. Your code should be appear in the following order:

 responseH = httpclient.execute(getHNMR); HttpEntity entityH = responseH.getEntity(); HNMR = EntityUtils.toString(entityH); responseC = httpclient.execute(getCNMR); HttpEntity entityC = responseC.getEntity(); CNMR = EntityUtils.toString(entityC);

brthornbury · Accepted Answer · 2012-08-06 15:16:48Z

Is it a requirement that you use httpClient? Given that it is only a text file and you don't need any post or get parameters, a simpler method would be:

URL url = new URL("http://www.hmdb.ca/labm/metabolites/" + HMDB + "/chemical/pred_hnmr_peaklist/" + HMDB + "_peaks.txt"); InputStream response = url.openConnection().getInputStream();

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