It's not problem with KnowledgeAgentImpl Try to increase permgen space in tomcat Catalina.bat. Thanks, Bharadwaj nakka On Wed, Mar 19, 2014 at 10:01 PM, Davide Sottara <dsotty(a)gmail.com&gt; wrote:

is it this problem a known bug? We have noticed this problem in our production system. We can not change Drools version easily. -- View this message in context: http://drools.46999.n3.nabble.com/KnowledgeAgentImpl-memory-leak-5-5-0-Fi... Sent from the Drools: User forum mailing list archive at Nabble.com.

First of all thank you very much for your helpWe have downloaded drools-5.5.x source code and tried your patch and we have noticed:- When our resources (guvnor) are not accessible KnowledgeAgent does not rebuild kbase- When our resources (guvnor) are accessible and we made some change then KnowledgeAgent rebuild kbase after every loop because guvnor responses LastModified (((HttpURLConnection) conn).getLastModified) as GMT datetime but it is not (it depends of the timezone)We have done more changes in drools-core.5.5.0.FINAL in the class UrlResource.java version to fix this private long grabLastMod() throws IOException { // use File if possible, as http rounds milliseconds on some machines, this fine level of granularity is only really an issue for testing // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4504473 if ("file".equals(url.getProtocol())) { File file = getFile(); return file.lastModified(); } URLConnection conn = openURLConnection(getURL()); if (conn instanceof HttpURLConnection) { ((HttpURLConnection) conn).setRequestMethod("HEAD"); }.......* long date = 0; try { date = Long.parseLong(conn.getHeaderField("lastModified")); } catch (Exception e) { /* well, we tried ... */ } if (date == 0) { date = conn.getLastModified(); }*....... return date; }On the other hand if cache file is updated KnowledgeAgent keeps rebuilding kbase, so to fix this we update lastRead variablepublic InputStream getInputStream() throws IOException { try { long lastMod = grabLastMod(); if (lastMod == 0) { //we will try the cache... if (cacheFileExists()) { *this.lastRead = getCacheFile().lastModified();* return fromCache(); } }......Finally, all these changes do not solve the problem of memory leak with incremental kbase changes because resource changes generate a kbase rebuilding (guvnor up). This causes a kbase memory increase -- View this message in context: http://drools.46999.n3.nabble.com/KnowledgeAgentImpl-memory-leak-5-5-0-Fi... Sent from the Drools: User forum mailing list archive at Nabble.com.

Did you finally get any solution to avoid memory leak in kbase building.. I am using drools/Guvnor 5.2 version. Coud you please list all the changes i have to do in source code to avoind all the issues which you were facing like 1) avoid rebuilding kbase from Cache, 2) avoid rebuilding cache when resource chnages in Guvnor etc.. Thank you -- View this message in context: http://drools.46999.n3.nabble.com/KnowledgeAgentImpl-memory-leak-5-5-0-Fi... Sent from the Drools: User forum mailing list archive at Nabble.com.

Ok, thanks for the reply. One more question. So what are the issues which you still have? I guess one is memory leak issue. Apart from this do you have any other issue? Thank you Santhosh From: alineasol [via Drools] [mailto:ml-node+s46999n4028986h75@n3.nabble.com] Sent: Thursday, March 27, 2014 3:59 PM To: Ajekar, Santhosh Hegde (HP-IT) Subject: Re: [rules-users] KnowledgeAgentImpl memory leak (5.5.0.Final) We only have resolved the rebuild from cache problem when resources are down You have the changes in the class UrlResource.java in our previous post in bold and also the patch posted by Toshiya Kobayashi: https://github.com/droolsjbpm/drools/commit/34d7d2c7de1ce55cea93f7317a7c6... ________________________________ If you reply to this email, your message will be added to the discussion below: http://drools.46999.n3.nabble.com/KnowledgeAgentImpl-memory-leak-5-5-0-Fi... To start a new topic under Drools: User forum, email ml-node+s46999n47000h9@n3.nabble.com<mailto:ml-node+s46999n47000h9@n3.nabble.com> To unsubscribe from KnowledgeAgentImpl memory leak (5.5.0.Final), click here<http://drools.46999.n3.nabble.com/template/NamlServlet.jtp?macro=...;. NAML<http://drools.46999.n3.nabble.com/template/NamlServlet.jtp?macro=... -- View this message in context: http://drools.46999.n3.nabble.com/KnowledgeAgentImpl-memory-leak-5-5-0-Fi... Sent from the Drools: User forum mailing list archive at Nabble.com.