The Web server and/or servlet container against which you are testing probably
has a limit set for the number of connections it will queue. In Tomcat 3.2.1,
for example, server.xml has the "backlog" parameter for a Connector:
<!-- Normal HTTP -->
<Connector className="org.apache.tomcat.service.PoolTcpConnector">
<Parameter name="handler"
value="org.apache.tomcat.service.http.HttpConnectionHandler"/>
<Parameter name="port"
value="8080"/>
<Parameter name="backlog" value="100"/>
</Connector>
In Tomcat 4.0.1, the Connector has an acceptCount attribute:
<!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
<Connector className="org.apache.catalina.connector.http.HttpConnector"
port="8080" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="60000"/>
Scott Nichol
----- Original Message -----
From: "Tiago Fernandes Thomaz" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, April 22, 2002 5:58 AM
Subject: Heavy loads on SOAP RPC
> Hi,
>
> I'm facing some trouble concerning heavy loads on soap rpc.
> I coded a soap client that simulates several clients with a Thread
> implementation.
> My snippet code is:
>
> public class SOAPClient
> {
> public static void main (String[] args) throws Exception
> {
> URL url = new URL(args[0]);
> String sXML = null;
>
> for (int i = 0; i < 50; i++)
> {
> sXML = "<?xml version=\"1.0\" encoding=\"US-ASCII\"?><request client
> = \"client"+i+"\" action = \"action"+i+"\"><parameter name =
> \"name"+i+"\">My Name"+i+"</parameter></request> ";
>
> Call call = new Call();
> call.setTargetObjectURI("urn:Connector");
> call.setMethodName("sendRequest");
> call.setEncodingStyleURI("http://schemas.xmlsoap.org/soap/encoding/";);
> Vector params = new Vector();
> params.addElement(new org.apache.soap.rpc.Parameter("sXML",
> String.class, sXML, null));
>
> call.setParams(params);
>
> (new TestThread(call, url)).start();
> }
> }
> }
>
>
> public class TestThread extends Thread
> {
> Call testCall = null;
> URL url = null;
>
> public TestThread(Call testCall, URL url)
> {
> this.testCall = testCall;
> this.url = url;
> }
>
> public void run()
> {
> try {
> org.apache.soap.rpc.Response resp = testCall.invoke(url, "");
>
> if (resp.generatedFault())
> {
> Fault fault = resp.getFault();
> System.out.println(this.getName() + "Fault Code = " +
> fault.getFaultCode());
> System.out.println(this.getName() + "Fault String = " +
> fault.getFaultString());
> }
> else
> {
> org.apache.soap.rpc.Parameter result = resp.getReturnValue();
> String res = result.toString();
> Object obj = result.getValue();
> String resp2 = obj.toString();
> System.out.println(this.getName()+" - Result: "+resp2);
> }
> }
> catch (Exception e)
> {
> System.out.println(this.getName() + " :Error! - " + e.getMessage());
> }
> }
> }
>
> , and I'm getting the following exception for most of the Threads (30 out of
> 50):
>
> Thread-i Error opening socket: Connection refused: connect
>
> Does anyone explain me why am I getting this? Is it because SOAP can only
> handle about 20 http connections?
>
> Tiago Fernandes Thomaz
>
