I've read that Drools is compatible with jdk 1.4 but I get the error below in IRAD 6 which is jdk version: java version "1.4.2" Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2) Classic VM (build 1.4.2, J2RE 1.4.2 IBM Windows 32 build cn142ifx-20060307 (142S R4-1 + 98226) (JIT enabled: jitc)) I searched the archives but could not find anything about this. Any suggestions would be appreciated. The java class could not be loaded. java.lang.UnsupportedClassVersionError: org/drools/event/KnowledgeRuntimeEventManager (Unsupported major.minor version 49.0) Thanks Kent

Our application is stuck with Websphere 6/jdk 1.4. I want to use Guvnor for our rule management as we have business users editing rules. Would it be possible to use drools 4.0.7 compiler in the application which would read the rules from guvnor as source instead of compiled ? I realize that we would have to avoid rule semantics that are new in drools 5. Could that work or are we asking for trouble ? My fallback option is to stand up a jboss server as a rules server and make requests to it via webservice calls. But I was hoping to have tighter integration between our application and the rules engine. Thanks for any input. FYI: we trying to migrate away from our Pega rules engine to drools and I have found drools to be very refreshing in a number of ways. Thanks for your excellent work. Mark Proctor <mproctor(a)codehaus.org&gt; Sent by: rules-users-bounces(a)lists.jboss.org 01/23/2009 10:33 AM Please respond to Rules Users List <rules-users(a)lists.jboss.org&gt; To Rules Users List <rules-users(a)lists.jboss.org&gt; cc Subject Re: [rules-users] Drools 5 m4 in IRAD/Websphere kfs2(a)chryslerfinancial.com wrote: I've read that Drools is compatible with jdk 1.4 but I get the error below in IRAD 6 which is jdk version: java version "1.4.2" Drools 4 is JDK1.4 compatible, Drools 5.0 is JDK1.5+ we do not have plans to backport. Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2) Classic VM (build 1.4.2, J2RE 1.4.2 IBM Windows 32 build cn142ifx-20060307 (142S R4-1 + 98226) (JIT enabled: jitc)) I searched the archives but could not find anything about this. Any suggestions would be appreciated. The java class could not be loaded. java.lang.UnsupportedClassVersionError: org/drools/event/KnowledgeRuntimeEventManager (Unsupported major.minor version 49.0) Thanks Kent _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Take a look at Retroweaver (http://retroweaver.sourceforge.net/). It compiles Java 5 source to JRE 1.4 classes. I remember there being several open-source tools like this but I could not find them with a quick search. I have not used this myself but have plans to integrate it into my build scripts. --Faron. From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: Monday, February 02, 2009 12:23 PM To: Rules Users List Subject: Re: [rules-users] Drools 5 m4 in IRAD/Websphere kfs2(a)chryslerfinancial.com wrote: Our application is stuck with Websphere 6/jdk 1.4. I want to use Guvnor for our rule management as we have business users editing rules. Would it be possible to use drools 4.0.7 compiler in the application which would read the rules from guvnor as source instead of compiled ? I realize that we would have to avoid rule semantics that are new in drools 5. Could that work or are we asking for trouble ? It won't work out of the box. Given enough time and resources you could probably make it work. My fallback option is to stand up a jboss server as a rules server and make requests to it via webservice calls. But I was hoping to have tighter integration between our application and the rules engine. Thanks for any input. FYI: we trying to migrate away from our Pega rules engine to drools and I have found drools to be very refreshing in a number of ways. Thanks for your excellent work. Mark Proctor <mailto:mproctor@codehaus.org> <mproctor(a)codehaus.org&gt; Sent by: rules-users-bounces(a)lists.jboss.org 01/23/2009 10:33 AM Please respond to Rules Users List <mailto:rules-users@lists.jboss.org> <rules-users(a)lists.jboss.org&gt; To Rules Users List <mailto:rules-users@lists.jboss.org> <rules-users(a)lists.jboss.org&gt; cc Subject Re: [rules-users] Drools 5 m4 in IRAD/Websphere kfs2(a)chryslerfinancial.com wrote: I've read that Drools is compatible with jdk 1.4 but I get the error below in IRAD 6 which is jdk version: java version "1.4.2" Drools 4 is JDK1.4 compatible, Drools 5.0 is JDK1.5+ we do not have plans to backport. Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2) Classic VM (build 1.4.2, J2RE 1.4.2 IBM Windows 32 build cn142ifx-20060307 (142S R4-1 + 98226) (JIT enabled: jitc)) I searched the archives but could not find anything about this. Any suggestions would be appreciated. The java class could not be loaded. java.lang.UnsupportedClassVersionError: org/drools/event/KnowledgeRuntimeEventManager (Unsupported major.minor version 49.0) Thanks Kent _____ _______________________________________________ rules-users mailing list <mailto:rules-users@lists.jboss.org> rules-users(a)lists.jboss.org <https://lists.jboss.org/mailman/listinfo/rules-users> https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <https://lists.jboss.org/mailman/listinfo/rules-users> https://lists.jboss.org/mailman/listinfo/rules-users _____ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

I have two questions. First, has any progress been made on "full" backward chaining? I assume it is no longer expected in version 5. And second, where can I find information on the "from" keyword? Is that a new feature in Drools 5? -Brandon Mark Proctor wrote: -- View this message in context: http://www.nabble.com/Backward-chaining-in-drools-5--tp21624381p23061652.... Sent from the drools - user mailing list archive at Nabble.com.