Yeah..more fun with functions. I have the following function function String getMyValue(){ return "value 1"; } I have declared it at the top of the rule file right after all imports and dialect statement but before any rules <imports> global Services services; global String currentProfilie; # setup dialect for the semantic code to be MVEL dialect "mvel" function String getMyValue(){ return "value 1"; } I then try to call the function from another rule consequence as a test: then System.err.println(getMapRouterAddress()); <other statements which work fine> Now as soon as I start up and the rule file is loaded, I get a null pointer exception that isn't really helpful as it simpoly points to one of my own external objects that references the session that failed to load. I have tried using functions many times and never successfully done so. How/where do I place a simple function like this and call it? Thanks Chris ________________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun Sent: Wednesday, October 14, 2009 8:15 AM To: Rules Users List Subject: Re: [rules-users] setting globals in rule file You could let the "user" write some functions such as function String parFoo(){ return "foo42"; } and evaluate them in a rule firing with high priority on eval(true). -W 2009/10/14 Chris Richmond <crichmond(a)referentia.com&gt; Hmm… Well..I have this rule file and it seems like a darn convenient place to set some configuration settings so the user could change them in the plain text file. Otherwise I have to implement another configuration settgin system then feed that to th setGlobal… Chris ________________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun Sent: Wednesday, October 14, 2009 7:50 AM To: Rules Users List Subject: Re: [rules-users] setting globals in rule file No, globals can only be set by calling the WorkingMemory method wm.setGlobal(String name, Object value) You could call this in a consequence (RHS), but it's usually not a good idea to do so. What do you want to achieve? -W 2009/10/14 Chris Richmond <crichmond(a)referentia.com&gt; Shouldn’t it be possible to set a global variable value within the rule file itself at the top. Something like? global String deviceName = “myDevice”; I thought you could do that, but consistently get an error saying illegal character ‘=’ expected “(“ Or something along those lines. This is possible and that syntax should work, shouldn’t it? Thanks, Chris _______________________________________________ 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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Great….. So, can I simply switch the dialect to not use MVEL? Chris ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wolfgang Laun *Sent:* Wednesday, October 14, 2009 8:50 AM *To:* Rules Users List *Subject:* Re: [rules-users] setting globals in rule file I've used functions with Drools 5, but not with MVEL. A recent thread seemed to indicate a problem with MVEL for functions, though. What you show of your code appears to be OK. -W On Wed, Oct 14, 2009 at 8:35 PM, Chris Richmond <crichmond(a)referentia.com&gt; wrote: Yeah..more fun with functions. I have the following function function String getMyValue(){ return "value 1"; } I have declared it at the top of the rule file right after all imports and dialect statement but before any rules <imports> global Services services; global String currentProfilie; # setup dialect for the semantic code to be MVEL dialect "mvel" function String getMyValue(){ return "value 1"; } I then try to call the function from another rule consequence as a test: then System.err.println(getMapRouterAddress()); <other statements which work fine> Now as soon as I start up and the rule file is loaded, I get a null pointer exception that isn't really helpful as it simpoly points to one of my own external objects that references the session that failed to load. I have tried using functions many times and never successfully done so. How/where do I place a simple function like this and call it? Thanks Chris ________________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun Sent: Wednesday, October 14, 2009 8:15 AM To: Rules Users List Subject: Re: [rules-users] setting globals in rule file You could let the "user" write some functions such as function String parFoo(){ return "foo42"; } and evaluate them in a rule firing with high priority on eval(true). -W 2009/10/14 Chris Richmond <crichmond(a)referentia.com&gt; Hmm… Well..I have this rule file and it seems like a darn convenient place to set some configuration settings so the user could change them in the plain text file. Otherwise I have to implement another configuration settgin system then feed that to th setGlobal… Chris ________________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun Sent: Wednesday, October 14, 2009 7:50 AM To: Rules Users List Subject: Re: [rules-users] setting globals in rule file No, globals can only be set by calling the WorkingMemory method wm.setGlobal(String name, Object value) You could call this in a consequence (RHS), but it's usually not a good idea to do so. What do you want to achieve? -W 2009/10/14 Chris Richmond <crichmond(a)referentia.com&gt; Shouldn’t it be possible to set a global variable value within the rule file itself at the top. Something like? global String deviceName = “myDevice”; I thought you could do that, but consistently get an error saying illegal character ‘=’ expected “(“ Or something along those lines. This is possible and that syntax should work, shouldn’t it? Thanks, Chris _______________________________________________ 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 _______________________________________________ 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