Re: [rules-users] rule parse error for null check

Thanks! Wolfgang --- On Sun, 28/8/11, Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; wrote: From: Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; Subject: Re: [rules-users] rule parse error for null check To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Sunday, 28 August, 2011, 11:33 PM See JBRULES-3064, dialect "mvel" flouts generic parameters. If you omit "<String,Integer>" after "new HashMap" all is well. Of course, this is another MVEL bug or restriction - who knows. But don't try to work around this by then    if($u.subjectGradeMap == null){       $u.subjectGradeMap = new HashMap/*<String,Integer>*/();    } You'll just run into another MVEL bug. -W 2011/8/28 Neel <neeleshdev(a)yahoo.co.in&gt; Hi,I'm using drools-5.3.0.Beta1. I've following rule file: import java.util.*; declare Student    name : String @key    subjectGradeMap : HashMap    end   rule "Subject grade points" dialect "mvel" when    $u : Student() then    if($u.subjectGradeMap == null)    {       $u.subjectGradeMap = new HashMap<String,Integer>();    }    $u.subjectGradeMap["CompSc"] += 100;    System.out.println("Marks added"); end I get following error while rule compilation: Unable to Analyse Expression if($u.subjectGradeMap == null);    {       $u.subjectGradeMap = new HashMap<String,Integer>();    };    $u.subjectGradeMap["CompSc"] += 100;    System.out.println("Marks added");: [Error: was expecting type: java.lang.Object; but found type: <Unknown>] [Near : {... if($u.subjectGradeMap == null) ....}]              ^ [Line: 1, Column: 1] : [Rule name='Subject grade points'] Please let me know if this is correct usage in the above scenario. Thanks, Neel _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users