[rules-users] JUnit testing

[Mike Dean]

Sorry to ask question and then figure it out!  I just substituted the actual
name of my suite class instead of saying this.class and it works
beautifully.  I am now testing Drools with JUnit 4 with no problems, after
nearly six months!  THANK YOU.

- Mike

Mike Dean wrote:
> 
> Thanks to both of you for pursuing this problem.  I have worked around it
> by putting my business classes and rules in a separate Drools project,
> testing everything there, and then copying them to my RCP.  I look forward
> to a better solution!
> 
> I must confess Java ignorance, but I use a test suite and try to
> instantiate the engine once and then run a series of tests.  My crash
> occurs before I get to the individual tests.  However, the setUp routine
> is static, and your code work around cannot be executed in a static
> context.  Where exactly to you put the test for a null classloader?
> 
> Thanks again.  I thought this issue simply died.
> 
> 
> Marcus Ilgner wrote:
>> 
>> Hi Edson,
>> 
>> thank you very much for testing this! Since I could not discern any
>> differences between your approach and mine, I decided to resolve the
>> issue manually by inserting a work-around in my test routine which
>> sets the context class loader for the current thread before calling
>> the method under test.
>> 
>> if (Thread.currentThread().getContextClassLoader() == null) {
>> 
>> Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
>> }
>> 
>> My guess is that the custom JUnit 4 class runner
>> (SpringJUnit4ClassRunner) somehow is responsible for the faulty
>> behaviour.
>> 
>> Thanks again
>> Marcus
>> 
>> 
>> On Mon, May 19, 2008 at 3:09 PM, Edson Tirelli <tirelli at post.com> wrote:
>>>
>>>    All,
>>>
>>>    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/
>>>
>>>    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:
>>>
>>>     @Test
>>>     public void testRuleBase() {
>>>         try {
>>>
>>>             //load up the rulebase
>>>             RuleBase ruleBase = readRule();
>>>             StatefulSession workingMemory =
>>> ruleBase.newStatefulSession();
>>>
>>>             //go !
>>>             Message message = new Message();
>>>             message.setMessage(  "Hello World" );
>>>             message.setStatus( Message.HELLO );
>>>             workingMemory.insert( message );
>>>             workingMemory.fireAllRules();
>>>             workingMemory.dispose();
>>>
>>>         } catch (Throwable t) {
>>>             t.printStackTrace();
>>>             Assert.fail("Something is wrong: "+t.getMessage());
>>>         }
>>>     }
>>>
>>>     /**
>>>      * Please note that this is the "low level" rule assembly API.
>>>      */
>>>     private RuleBase readRule() throws Exception {
>>>         //read in the source
>>>         Reader source = new InputStreamReader(
>>> DroolsTest.class.getResourceAsStream( "/Sample.drl" ) );
>>>
>>>         PackageBuilderConfiguration conf = new
>>> PackageBuilderConfiguration();
>>>         JavaDialectConfiguration javaConf = (JavaDialectConfiguration)
>>> conf.getDialectConfiguration("java");
>>>         javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
>>>         javaConf.setJavaLanguageLevel("1.5");
>>>
>>>         PackageBuilder builder = new PackageBuilder( conf );
>>>         builder.addPackageFromDrl( source );
>>>
>>>         RuleBase ruleBase = RuleBaseFactory.newRuleBase();
>>>         ruleBase.addPackage( builder.getPackage() );
>>>         return ruleBase;
>>>     }
>>>
>>>     Hope it helps,
>>>       Edson
>>>
>>>
>>> 2008/5/19 Marcus Ilgner <marcus.ilgner at gmail.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 <mdean77 at comcast.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(RuleBaseConfiguration.java:569)
>>>>        at
>>>> org.drools.RuleBaseConfiguration.determineConsequenceExceptionHandler(RuleBaseConfiguration.java:561)
>>>>        at
>>>> org.drools.RuleBaseConfiguration.init(RuleBaseConfiguration.java:220)
>>>>        at
>>>> org.drools.RuleBaseConfiguration.<init>(RuleBaseConfiguration.java:133)
>>>>        at
>>>> org.drools.common.AbstractRuleBase.<init>(AbstractRuleBase.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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>> 
>> 
> 
> 

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