List Info

Thread: Re: Re: JUnit testing
Re: Re: JUnit testing
user name
 2008-05-19 05:02:47 
Hi list,

I'm reviving this thread because I happen to have the same
problem.

On Sun, Mar 23, 2008 at 7:34 PM, Mike Dean <mdean77comcast.net> wrote:
>
> Thanks (months later!).  I have cut down my code
example below to show this
> issue more clearly:
>
>
> John J. Franey wrote:
>>
>> NullPointerException on line 146 means classLoader
is null.   That is odd.
>> I have no idea why the code that gets classLoader
won't work in eclipse's
>> junit runtime, but does when run in your eclipse
plugin.

 It seems indeed like during JUnit tests, the context
classloader of
the thread gets not set (null).

The code leading up to the problem is as follows:
PackageBuilderConfiguration conf = new
PackageBuilderConfiguration();
JavaDialectConfiguration javaConf =
(JavaDialectConfiguration)
conf.getDialectConfiguration("java");
javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
javaConf.setJavaLanguageLevel("1.5");
RuleBase ruleBase = RuleBaseFactory.newRuleBase();

The resulting stacktrace is:
java.lang.NullPointerException
	at
org.drools.RuleBaseConfiguration.instantiateClass(RuleBaseCo
nfiguration.java:569)
	at
org.drools.RuleBaseConfiguration.determineConsequenceExcepti
onHandler(RuleBaseConfiguration.java:561)
	at
org.drools.RuleBaseConfiguration.init(RuleBaseConfiguration.
java:220)
	at
org.drools.RuleBaseConfiguration.<init>(RuleBaseConfig
uration.java:133)
	at
org.drools.common.AbstractRuleBase.<init>(AbstractRule
Base.java:147)
	at
org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase
.java:124)
	at
org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase
.java:101)
	at
org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:
57)
	at
org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:
38)

Has anyone set up Drools and JUnit successfully? Maybe we
forgot to
set up the environment properly?

Best regards
Marcus
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Re: Re: JUnit testing
user name
 2008-05-19 08:09:25 

  


  

    
 &nbsp; All,

&nbsp;  I see that the code in that spot is weak and could be improved. Although, using drools 4.0.7, I successfully created a junit 4 test that I paste bellow. Also, the whole drools code is tested with junit 3 and we have no problems. For instance, look at our integration tests here:


http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/drools-compiler/src/test/java/org/drools/integrationtests/


 &nbsp; The code I used to create the junit 4 test is based on the default example create by the drools plugin + the snippet you showed bellow:

&nbsp;   Test
 ; &nbsp; public void testRuleBase() {
 &nbsp; &nbsp;   ; try {
 &nbsp; &nbsp;   ; &nbsp; &nbsp; 

 &nbsp;   ; &nbsp; &nbsp; &nbsp; //load up the rulebase
&nbsp;   ; &nbsp; &nbsp; &nbsp;  RuleBase ruleBase = readRule();
 &nbsp; &nbsp; &nbsp;   ; &nbsp; StatefulSession workingMemory = ruleBase.newStatefulSession();
&nbsp;   ; &nbsp; &nbsp; &nbsp;  
 &nbsp; &nbsp; &nbsp;   ; &nbsp; //go !
 &nbsp; &nbsp;   ; &nbsp; &nbsp; Message message = new Message();

 &nbsp; &nbsp;   ; &nbsp; &nbsp; message.setMessage(&nbsp; "Hello World"; );
 &nbsp;   ; &nbsp; &nbsp; &nbsp; message.setStatus( Message.HELLO );
 &nbsp;   ; &nbsp; &nbsp; &nbsp; workingMemory.insert( message );
 &nbsp;   ; &nbsp; &nbsp; &nbsp; workingMemory.fireAllRules();
&nbsp; &nbsp;   ; &nbsp; &nbsp;  workingMemory.dispose();

 ; &nbsp; &nbsp; &nbsp; &nbsp;   
 &nbsp; &nbsp; &nbsp;  } catch (Throwable t) {
 &nbsp; &nbsp;   ; &nbsp; &nbsp; t.printStackTrace();
  ; &nbsp; &nbsp; &nbsp; &nbsp;  Assert.fail("Something is wrong: "+t.getMessage());
 &nbsp; &nbsp;   ; }
 &nbsp;  }

 &nbsp;  /**
   ;  * Please note that this is the "low level"; rule assembly API.

&nbsp; &nbsp;  */
 &nbsp;  private RuleBase readRule() throws Exception {
 &nbsp; &nbsp;   ; //read in the source
&nbsp; &nbsp; &nbsp;   Reader source = new InputStreamReader( DroolsTest.class.getResourceAsStream( "/Sample.drl&quot; ) );
 &nbsp;   ; &nbsp; 

 &nbsp;   ; &nbsp; PackageBuilderConfiguration conf = new PackageBuilderConfiguration();
&nbsp;   ; &nbsp;  JavaDialectConfiguration javaConf = (JavaDialectConfiguration) conf.getDialectConfiguration(&quot;java&quot;);
   ; &nbsp; &nbsp; javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);

 &nbsp;   ; &nbsp; javaConf.setJavaLanguageLevel(&quot;1.5&quot;);
   ; &nbsp; &nbsp; 
 &nbsp; &nbsp; &nbsp;  PackageBuilder builder = new PackageBuilder( conf );
 &nbsp;   ; &nbsp; builder.addPackageFromDrl( source );
 &nbsp;   ; &nbsp; 
 &nbsp; &nbsp; &nbsp;  RuleBase ruleBase = RuleBaseFactory.newRuleBase();


 &nbsp; &nbsp; &nbsp;  ruleBase.addPackage( builder.getPackage() );
 &nbsp;   ; &nbsp; return ruleBase;
  ;  }

 &nbsp;  Hope it helps,
&nbsp; &nbsp; &nbsp; Edson


2008/5/19 Marcus Ilgner < marcus.ilgnergmail.com">marcus.ilgnergmail.com>:


Hi list,




I'm reviving this thread because I happen to have the same problem.





On Sun, Mar 23, 2008 at 7:34 PM, Mike Dean < mdean77comcast.net">mdean77comcast.net> wrote:

&gt;

> Thanks (months later!).  I have cut down my code example below to show this

>; issue more clearly:


>

>;

> John J. Franey wrote:

&gt;>

&gt;> NullPointerException on line 146 means classLoader is null.   That is odd.

>;> I have no idea why the code that gets classLoader won't work in eclipse9;s

>&gt; junit runtime, but does when run in your eclipse plugin.




 It seems indeed like during JUnit tests, the context classloader of

the thread gets not set (null).



The code leading up to the problem is as follows:


PackageBuilderConfiguration conf = new PackageBuilderConfiguration();


JavaDialectConfiguration javaConf = (JavaDialectConfiguration)

conf.getDialectConfiguration("java");

javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);

javaConf.setJavaLanguageLevel("1.5");


RuleBase ruleBase = RuleBaseFactory.newRuleBase();




The resulting stacktrace is:

java.lang.NullPointerException

        at org.drools.RuleBaseConfiguration.instantiateClass(RuleBaseConfiguration.java:569)

        at org.drools.RuleBaseConfiguration.determineConsequenceExceptionHandler(RuleBaseConfiguration.java:561)

        at org.drools.RuleBaseConfiguration.init(RuleBaseConfiguration.java:220)

        at org.drools.RuleBaseConfiguration.<init&gt;(RuleBaseConfiguration.java:133)

        at org.drools.common.AbstractRuleBase.<init>(AbstractRuleBase.java:147)


        at org.drools.reteoo.ReteooRuleBase.<init&gt;(ReteooRuleBase.java:124)

        at org.drools.reteoo.ReteooRuleBase.<init&gt;(ReteooRuleBase.java:101)

        at org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:57)


        at org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:38)




Has anyone set up Drools and JUnit successfully? Maybe we forgot to

set up the environment properly?



Best regards

Marcus


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-- 
 Edson Tirelli
 JBoss Drools Core Development
 Office: +55 11 3529-6000
 Mobile: +55 11 9287-5646
 JBoss, a division of Red Hat  www.jboss.com


  

  
  
   
     
    






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