[jboss-jira] [JBoss JIRA] Commented: (JBRULES-746) NPE when dumping XML

[Edson Tirelli (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-746?page=comments#action_12356925 ] 
            
Edson Tirelli commented on JBRULES-746:
---------------------------------------

Hey Edson,

I have narrowed it down . .

if i use null in the condition it fails ... if dont use null or if i use
null in strings it works .. thought the rule will not fire correctly as
itemStatusCode is null ...

Does not work
item : ItemVo( itemStatusCode == null) 

Works 
item : ItemVo( itemStatusCode == "null")  -- But the rule is wrong and
does not get fired even though itemStatusCode is null becoz it compares
with the literal "null" ..

Can we not check for nulls this way .. is there some different synatx
for checking nulls in DRL files ... 

thanks in advance 

Sanjay

> NPE when dumping XML
> --------------------
>
>                 Key: JBRULES-746
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-746
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Drl Parser/Builder
>    Affects Versions: 3.1-m1
>            Reporter: Edson Tirelli
>         Assigned To: Edson Tirelli
>             Fix For: 3.1-m2
>
>
> REPORTED BY SANJAY SINGH
> ---------------------------------------------
> What is wrong with this drl file ? When i try to create a xml out of it .. it keeps on failing on me .. while testing things out the rule works just fine .. its just the XmlDumper class which throws exception (InvocationTarget) .. Anybody else tried to generate xmls from drl files .. there are not many examples for the latest syntax of XML so i thought to create the DRL's first and then generate XML's off them .. but a very basic Drl failing is just killing my enthusiasm to go on with drools ..
> DRL
> package com.walmart.itemfile.item.rules
> import com.walmart.itemfile.item.vo.ItemVo;
> import com.walmart.itemfile.item.dao.ItemDao;
> import com.walmart.itemfile.item.dao.ItemValidationDao;
> import java.lang.String;
> global com.walmart.itemfile.item.dao.ItemValidationDao itemValidationDao;
> global com.walmart.itemfile.rules.ValidationErrorMap errors;
> rule "Item status sode cannot be null"
>         when
>                 item : ItemVo(itemStatusCode == null)
>         then
>                 errors.addValidationError("nullItemStatusCode","Item Status Code is null");
>                 System.out.println("Item Status Code is " + item.getItemStatusCode());
> end
> JAVA
>                         DrlParser parser = new DrlParser();
>                 final PackageDescr pkgOriginal = parser.parse( new InputStreamReader( getClass().getResourceAsStream( "testRules.drl" ) ) );
>                 final XmlDumper dumper = new XmlDumper();
>                 final String result = dumper.dump( pkgOriginal );
> EXCEPTION 
> ...
> Caused by: java.lang.NullPointerException
>         at org.drools.xml.XmlDumper.replaceIllegalChars(XmlDumper.java:309)
>         at org.drools.xml.XmlDumper.visitLiteralRestrictionDescr(XmlDumper.java:136)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
>         at java.lang.reflect.Method.invoke(Method.java:391)
>         at org.drools.util.ReflectiveVisitor.visit(ReflectiveVisitor.java:41)
>         at org.drools.xml.XmlDumper.processFieldConstraint(XmlDumper.java:216)
>         at org.drools.xml.XmlDumper.visitFieldConstraintDescr(XmlDumper.java:102) 
> ...

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