[rules-users] The Eclipse JDT Core jar is not in the classpath

[Christopher.Mathrusse at sybase.com]

Hi Mark,

After a bit of debugging I managed to resolve my issue. It appears the 
correct way to resolve this issue is to instantiate an instance of 
PackageBuilderConfiguration and pass into the constructor a Properties 
object where you specify your options.

Spring configuration:
  <bean id="packageBuilderConfig" class=
"org.drools.compiler.PackageBuilderConfiguration">
    <constructor-arg type="java.util.Properties">
      <props>
        <prop key="drools.dialect.java.compiler">JANINO</prop>
      </props>
    </constructor-arg>
  </bean> 

Next, this PackageBuilder must be set as a value in the Map that is passed 
into the method createRuleExecutionSet of the Provider (
javax.rules.admin.LocalRuleExecutionSetProvider). This can be accomplished 
in the Spring configuration as well using the following:
          <property name="properties">
            <map>
              <entry key=
"javax.rules.admin.RuleExecutionSet.packageBuilderConfiguration" value-ref
="packageBuilderConfig"/>
            </map> 
          </property>

Finally, the ruleSetProperties are passed into the createRuleExecutionSet 
method:
RuleExecutionSet ruleExecutionSet = provider.createRuleExecutionSet( 
sourceAsInputStream, rulesetProperties);

And voil! Drools is now using Janino. Sadly, the application server I am 
deploying to seems to be having a classloader  issue preventing Drools 
from being able to load the org.codehaus.janino.Parser class. But that is 
an issue that has nothing to do with Drools I am happy to say.

Thanks again for the help.

Chris 




Christopher.Mathrusse at sybase.com 
Sent by: rules-users-bounces at lists.jboss.org
06/12/2008 08:43 AM
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Re: [rules-users] The Eclipse JDT Core jar is not in the classpath







Hi Mark, 

Thanks for the reply. I created a packagebuilder.conf file that simply had 
name/value pairs in it as follows: 

drools.dialect.java.compiler=JANINO 

and I placed into one of each of the following locations: 

WEB-INF 
WEB-INF/classes 
META-INF 

I tried each one, one after the other but I still receive the same error 
message at application startup. Do I have the entries correct? Should I be 
placing this somewhere else? Is there something that I am still 
overlooking? 

Thanks for the help... 

Chris 


Mark Proctor <mproctor at codehaus.org> 
Sent by: rules-users-bounces at lists.jboss.org 
06/12/2008 03:43 AM 

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Rules Users List <rules-users at lists.jboss.org>


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Re: [rules-users] The Eclipse JDT Core jar is not in the classpath








Christopher.Mathrusse at sybase.com wrote: 

I'm using JBoss Rules 4.01 with Spring 2.5 and I'm utilizing the JSR-94 
interfaces provided by Spring Modules. When deploying my application I 
receive the error: 

The Eclipse JDT Core jar is not in the classpath 

I've searched through the postings and found that setting the compiler to 
drools.dialect.java.compiler should resolve the issue but I am having 
trouble figuring out where to set this property on the JSR_94 interfaces. 
I've tried passing a Map into 

ruleAdministrator.getLocalRuleExecutionSetProvider(providerProperties); 

with the following specified in my Spring configuration: 
       <prop key="drools.dialect.java.compiler">JANINO</prop> 

but I believe the initialization occurs long before this point. 

I've also tried dropping into the applications WEB-INF/lib directory a 
copy of the jasper-compiler-jdt.jar into the WEB-INF/lib directory, which 
should satisfy the dependency, but it didn't seem to resolve the issue. 
Either that's the wrong classpath location, or that jasper compiler isn't 
hte same thing, try the jdt.jar supplied with drools. 
I would prefer it if there was some way of setting this property without 
having to use the JDT libraries. 
This should be possible, have you tried adding a packagebuilder.conf to 
tbe WEB-INF directory as the propperties loader checks for one of those 
first. 

I saw that I can provide system properties to make Drools aware of the req
uested compiler setting but this is not really an option as I am running 
inside of a J2EE container and I am unable to modify the settings that are 
provided to the application server. Is there a default location in the 
classpath that Drools looks for a properties file that I can specify these 
values? Or better still, is there a way that I can supplied them to the 
JSR-94 interfaces to ensure proper initialization? 
no and it is for this reason that I tell people to stay away from the 
abomination that is JSR94. 

Thanks very much for the help.

Chris 


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