Excessive no. of ports remaining open with HttpUrlConnection

Question

Hi,
I am facing problem where excess no. of TCP ports getting opened or remaining open on client of my application (from where I send XML requests to application).
The scenario happens when I simulate a load of 100 concurrent requests through JMeter (SOAP/XML-RPC requests)
Client app is deployed on Tomcat 5.5 on a Linux box.
My code looks like follow:
try {
URL url = new URL(<url string>);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setConnectTimeout(10000);
httpURLConnection.setDoOutput(true);
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(httpURLConnection.getOutputStream());
outputStreamWriter.write(<write something>);
outputStreamWriter.close();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
<read buffered reader here>
bufferedReader.close();
} catch {}
finally {
httpURLConnection.disconnect();
}What's wrong here that is causing excessive TCP IP ports to remain open?
Also, I want to restrict the no. of Http connections that I can make from client to server. Is this possible?
I searched about <Connector acceptCount=<> .... > in server.xml on Tomcat. But it is about incoming connections on Tomcat port and not the outgoing connections. I also explored -Dhttp.maxconnections but it doesn't serve my purpose. Only option I can think about is creating a custom object pool for HttpConnectionUrl (which I would like to avoid due to some reasons)
Is there any built-in support/ready API/tool to restrict no .of connections while sending Http requests?
regards,
suraj

Answer 1

I am facing problem where excess no. of TCP ports getting opened or remaining open on clientCompared to what?
The scenario happens when I simulate a load of 100 concurrent requests through JMeter (SOAP/XML-RPC requests)Aha.
What's wrong here that is causing excessive TCP IP ports to remain open? Nothing except your definition of 'excessive'. You are simulating hundreds of clients on one client host so you will get all the bahaviour of those client hosts in your single client host. The problem is in the simulation, not the TCP ports.
Also, I want to restrict the no. of Http connections that I can make from client to server. Is this possible? Why?