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
>  
> 
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