Problem

The following error occurs when users try to access to composer GUI:

java.io.FileNotFoundException: http://<Composer_serverName>:<Port>/lib/ext/antlr-...
at sun.net.www.protocol.http.HttpURLConnection.getInputStream... Source)
at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)
at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)
at com.sun.deploy.net.BasicHttpRequest.doGetRequestEX(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.checkUpdateAvailable(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.isUpdateAvailable(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Resolution

This error is usually observed after a update of Composer. It is due to a dynchronization of the java libraries between the client and the server.
To solve this problem, it is necessary to clean the java cache on client side before to call the Composer GUI:

1.Click Start > Control Panel.
2.Locate and double click the Java icon in the Control Panel.
3.Click Settings under Temporary Internet Files.
4.Click Delete Files.
5.Select all boxes and click OK on Delete Temporary Files window.
6.Click OK on Temporary Files Settings window.
7.Click OK to close the Java Control Panel.