8:09 a.m.
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-compi...
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(a)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(a)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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Edson Tirelli
JBoss Drools Core Development
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