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    <p>Managing your threads in application servers is not recommended. If you are using EJBs, the spec <a href="http://java.sun.com/blueprints/qanda/ejb_tier/restrictions.html#threads" rel="nofollow">disallows that</a>.</p> <p>Why don't you use use a caching solution to improve the performance? The first few requests will be slower, but once the cache is hot everything will be very fast.</p> <p>If caching the data is not feasible, what about changing the client to make multiple requests to the server, instead of splitting one request in multiple threads? You would need to change your web application, so that each method would call one web service. The client would call (in parallel) each method needed for the current page and assemble the final result (it may be possible to display partial results if you wish). By doing this you will do work in parallel and won't violate the spec. </p> <p>I assume you have something like this, in your server:</p> <pre><code>public Result retriveData(Long id) { Result myResult = new Result(); //... //do some stuff myResult.setSomeData(slowWebService1.retriveSomeData(id)); myResult.setSomeOtherData(slowWebService2.retriveSomeOtherData(id)); myResult.setData(slowWebService3.retriveData(id)); return myResult; } </code></pre> <p>In your client:</p> <pre><code>Result result = webApplication.retriveData(10); //use the result </code></pre> <p>My proposal, is to split the calls in multiple methods:</p> <pre><code> public SomeData retriveSomeData(Long id) { //do some stuff SomeData data = slowWebService1.retriveSomeData(id); //do more stuff return data; } public SomeOtherData retriveSomeOtherData(Long id) { //do some stuff SomeOtherData data = slowWebService2.retriveSomeOtherData(id); //do more stuff return data; } public Data retriveData(Long id) { //do some stuff Data data = slowWebService3.retriveData(id); //do more stuff return data; } </code></pre> <p>In your client:</p> <pre><code>//Call these methods in parallel, if you were using Swing, this could be done with //SwingWorker (I have no idea how to it with Flash :)). //You can either wait for all methods to return or show partial results. callInBackground(webApplication.retriveSomeData(10), useDataWhenDone); callInBackground(webApplication.retriveSomeOtherData(10), useDataWhenDone); callInBackground(webApplication.retriveData(10), useDataWhenDone); </code></pre> <p>By doing this you are calling only your web application, just like before, so there shouldn't be any security issues.</p> <p>I am not familiar with Websphere, so I can't tell if using its asynchronous beans are better than this, but <strong>IMHO</strong> you should avoid starting threads manually.</p>
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    1. POIs using threadpool in this multthreading case advisible?
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    1. COThank you for reply "iruediger". Do you mean caching the data retrieved from webservices?. We cannot do this, because the request from user is unique (eg: Input is SSN and output will be all the medical details from many services).. If your suggestion is not data caching, can you please explain a bit more. Thank you
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    2. COYes, I was thinking about data caching with something like [Ehcache](http://ehcache.org/). Since that's no feasible for your system, you could change the client to make multiple requests (check my answer).
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    3. COMy client application is a Flash application and all the webservices are external 3rd party services. Flash player has an internal security measure that would not allow to interact with other servers other than its hosting server. The only way it can happen is, all these 3rd party servers must have crossdomain.xml in their servers with access to our servers domain. No service provider will agree for it. Only option is to call these services from our app server. we are back at square one again.
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