Thanks Jim! I'd really like to see this in HiveMind! Marcus
> -----Original Message----- > From: Jimr [mailto:[EMAIL PROTECTED] > Sent: Friday, December 01, 2006 12:28 AM > To: user@hivemind.apache.org > Subject: HiveMind 1.1.1 / jar locking / XMLResourceProcessor > > > I am writing this to document a resolution to a problem I > have found while running HiveMind within a servlet container > on Windows and the way that HiveMind searches for xml files > within jars on the classpath (hivemodule.xml, etc) > > This is specific to windows, and its file locking behaviour. > > Environment: Windows XP SP2, JDK 1.5.0_05, HiveMind 1.1.1, > Tomcat 5.5.12 > > Problem: When undeploying a webapp that uses HiveMind, the > Hivemind-1.1.1.jar, Hivemind-lib-1.1.1.jar (and any other > jars that contain Hivemind module descriptors) within the > webapp are locked and cannot be deleted. This results in a > failure to undeploy the webapp. If the servlet container > (Tomcat) is shut down, the lock is released and the jars can > be deleted. > > XMLResourceProcessor involvement: This class appears to be > involved in searching for module descriptors on the classpath > using a url. However it does not set caching to false before > doing the url.openStream() call. This means that all the jars > that it opens get locked by windows. > > Root cause: Jar access using a URL with caching enabled. See: > [url]http://forum.springframework.org/archive/index.php/t-1951 6.html[/url] > [url]http://tomcat.apache.org/faq/windows.html#lock[/url] > > Resolution: > Make sure the following code is ran before instantiating > HiveMind (can use ServletContextListener for example): > [code] > try > { > if(System.getProperty("os.name").contains("Windows")) > new > URL("http://This-is-just-to-get-the-URLConnection";).openConnec tion().setDefaultUseCaches(false); > } > catch (IOException e) > { > e.printStackTrace(); > } > [/code] > > This is a vm-wide setting so it will affect all url > connections. Why isn't this code cleaner? See: > [url]http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4851466[/url] > [url]http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4405789[/url] > > I hope this helps anyone else in the same situation! > Maybe the code could also be in HiveMind itself? I'll leave > that to the dev team. > There are three files in total that contain this type of code: > XMLResourceProcessor.java, MessageFinderImpl.java, and > URLResource.java > > Jim > -- > View this message in context: > http://www.nabble.com/HiveMind-1.1.1---jar-locking---XMLResour ceProcessor-tf2735127.html#a7630408 > Sent from the Hivemind - User mailing list archive at Nabble.com. > >
