hi,thank you very much for helping me with the problem.nevertheless,I have got another error. I compile the program and get the errors as follows: [4,0]: [ERR 103] Line 4:0 rule 'rule_key' failed predicate: {(validateIdentifierKey(DroolsSoftKeywords.RULE))}? in rule [4,9]: [ERR 101] Line 4:9 no viable alternative at input 'com' in rule package I don't know how it happened, looking forward to your reply! thank you !!! > Try adding 'dialect "mvel"' (no single quotes) after the rule name to the top of each of the rules. I have seen this error before and doing this resolved the issue. > > >hello,everyone!I wrote a rule with Drools,but the error told me that the field Server.Message is not visible, I can't find how it happens. Please > >help me, I am almost exhausted with it. thank you. > >the rules are as follows: > > > >package com.sample > >import com.sample.Server; > > > >rule "system will execute 'tc' command" > > when > > eval(Server.Message>8388608) > > then > > System.out.println("The network is so crowd that it needs repairing."); > > Runtime.getRuntime().exec("tc");#execute the "tc" command end > > > >rule "caution" > > when > > eval(Server.Message==8388608) > > then > > System.out.println("caution!The network maybe will get blocked very soon."); end > > > >rule "fluent network" > > when > > eval(Server.Message<8388608)#conditions > > then > > System.out.println("the current network is very good"); > > #actions > >end > > > _______________________________________________ > 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