We are running a simple stress test (whose code I will paste below) for a numbercompare rule file) We get the following error before the test finishes. Which seems odd for one rule javax.servlet.ServletException: java.lang.OutOfMemoryError: PermGen space This test is run against 3 loablanced tomcat servers Here is my JVM_OPTS for each of those tomcat JVM_OPTS="-Xms4096m -Xmx4096m -XX:NewSize=2048m -XX:PermSize=512m -XX:MaxPermSize=512m -Xss1024K -XX:+UseCodeCacheFlushing -XX:-UseSplitVerifier" Here is I have a simple rule file deployed on guvnor on my abc with JVM_OPTS on the guvnor being JVM_OPTS="-Xms4096m -Xmx4096m -XX:NewSize=2048m -XX:PermSize=512m -XX:MaxPermSize=512m -Xss1024K Here is my stress test that we are running package DroolsTest; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import confident.guppy.tools.Caller; public class DroolsSpeedTest { public static void main(String[] args) { HttpURLConnection httpURLConnection = null; InputStream inputStream = null; BufferedReader bufferedReader = null; long t1 = System.currentTimeMillis(); for (int i = 0; i < 10000; i++) { try { long start = System.currentTimeMillis(); // Three boxes String url = "https://abc-uat2.xyz.com/ces/v2.0/rules/10/compare/10"; httpURLConnection = (HttpURLConnection) ( new URL(url).openConnection()); if (httpURLConnection != null) { inputStream = httpURLConnection.getInputStream(); bufferedReader = new BufferedReader(new InputStreamReader( inputStream)); String results = ""; String info = ""; while ((info = bufferedReader.readLine()) != null) { results += info; } //caller.log(results); } else { System.out.println("Unable to create the HTTP connection with the required server..."); } if (i % 20 == 0 && i != 0 ) { System.out.println(" passing " + i + " ms " + ( System.currentTimeMillis() - start )); } } catch (Exception boom) { boom.printStackTrace(); System.out.println("It died on the " + i + " attempt because " + boom.getMessage()); } } long t2 = System.currentTimeMillis() - t1 ; System.out.println("I took ms : "+ t2 ); } } Here is my rules defined on guvnor package org.numbercompare; declare NumberCompare message : String numberone: Integer numbertwo: Integer end rule "numberone is equals to numbertwo" when n: NumberCompare(numberone == numbertwo); then n.setMessage("numberone is equals to numbertwo"); end rule "numberone is greater than numbertwo" when n: NumberCompare(numberone > numbertwo); then n.setMessage("numberone is greater than numbertwo"); end rule "numberone is less than numbertwo" when n: NumberCompare(numberone < numbertwo); then n.setMessage("numberone is less than numbertwo"); end Here is my code that updates the rule file public KnowledgeBase readKnowledgeBase() throws Exception { ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); ResourceChangeScannerConfiguration sconf = ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration(); sconf.setProperty("drools.resource.scanner.interval", "2"); ResourceFactory.getResourceChangeScannerService().configure(sconf); KnowledgeAgentConfiguration kaconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration(); kaconf.setProperty("drools.agent.scanDirectories", "true"); kaconf.setProperty("drools.agent.scanResources", "true"); kaconf.setProperty("drools.agent.newInstance", "false"); KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("CS", kaconf); kagent.applyChangeSet(ResourceFactory.newClassPathResource("ChangeSet.xml")); KnowledgeBase kbase = kagent.getKnowledgeBase(); return kbase; } @Override public DroolsDTO getDroolsDTO(int numberone, int numbertwo) throws Exception { DroolsDTO droolsDTO = new DroolsDTO(); KnowledgeBase kb = readKnowledgeBase(); FactType factType = kb.getFactType("org.numbercompare", "NumberCompare"); Object nc = factType.newInstance(); factType.set(nc, "numberone", numberone); factType.set(nc, "numbertwo", numbertwo); StatefulKnowledgeSession ksession = kb.newStatefulKnowledgeSession(); ksession.insert(nc); ksession.fireAllRules(); ksession.dispose(); droolsDTO.setMessage(factType.get(nc, "message").toString()); return droolsDTO; } My changeset.xml <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/... <add <resource source='http://abc:8082/guvnor/org.drools.guvnor.Guvnor/package/org.numbercompare/LATEST' type='PKG' basicAuthentication="enabled" username="admin" password="admin"/ </add</change-set Also in the guvnor logs during the test I see , I see thousands of these: WARN 28-01 11:50:55,551 (RulesRepositoryManager.java:getRulesRepository:70) Creating RulesRepository with default username. =============== session-guest-864931 and the session-guest numbers keep climbing. and admin user logging in about every second. -- View this message in context: http://drools.46999.n3.nabble.com/permgen-error-for-simple-rule-stress-te... 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