newKieSession("rules") takes 2 minutes in 6.2.0.Final - takes 20 minutes in 6.5.0.Final and 7.0.0.Final ------------------------------------------------------------------------------------------------------- Key: DROOLS-1631 URL: https://issues.jboss.org/browse/DROOLS-1631 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.5.0.Final, 7.0.0.Final Reporter: Mark Langford Assignee: Mario Fusco We are currently converting our iLog rule engine solution to a Drools based system with good success. The project is a Maven project using Spring Boot 1.5.2 and Java 1.8. We have converted 1800+ rules (including 83 decision tables) from their iLog format to Drools format. We were using version 6.2.0. The newKieSession method took approx 2 minutes on the first run to compile our rules and provide the kieSession: - KieContainer kieContainer = KieServices.Factory.get().newKieClasspathContainer(); KieSession kSession = kieContainer.newKieSession("ric-rules"); I decided to upgrade to version 6.5.0 by updating our pom.xml. When I ran the code again, the above newKieSession method took 20 minutes to complete. It also seems like our rule processing stalled or hung with no Exceptions being reported. I have the following dependencies in our pom.xml <drools.version>6.5.0.Final</drools.version> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-mail</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jms</artifactId> </dependency> <dependency> <groupId>org.kie</groupId> <artifactId>kie-api</artifactId> <version>${drools.version}</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-core</artifactId> <version>${drools.version}</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>${drools.version}</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-decisiontables</artifactId> <version>${drools.version}</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-templates</artifactId> <version>${drools.version}</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.6</version> </dependency> I also found someone else on Stackoverflow with the same/similar issue [ |http://example.com]