[rules-users] Drools and Guvnor 5.1M2 - Exception beingthrownin processChangeSet

Wed Jun 30 23:14:02 EDT 2010

Thanks.  I started going down that path.  It appears that even the
changeset xml file can't be found from the Guvnor.  So I will need to
pass authentication with the URL given to the applyChangeset method.

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Esteban
Aliverti
Sent: Wednesday, June 30, 2010 6:35 PM
To: Rules Users List
Subject: Re: [rules-users] Drools and Guvnor 5.1M2 - Exception
beingthrownin processChangeSet

The problem seams to happen because the kagent can't access the url. 

If you try to access the change set xml using a browser, does the
browser ask you for authentication? I don't know why, but guvnor protect
its urls since 5.1 I think. 

So, basically, the error is that guvnor can't read from the url. The
same error happens if you provide a non existent url. I need to open a
jira for this.

As a work around, try doing this:

<change-set xmlns='http://drools.org/drools-5.0/change-set
<http://drools.org/drools-5.0/change-set> '

    xmlns:xs='http://www.w3.org/2001/XMLSchema-instance
<http://www.w3.org/2001/XMLSchema-instance> '

    xs:schemaLocation='http://drools.org/drools-5.0/change-set
drools-change-set-5.0.xsd
<http://drools.org/drools-5.0/change-setdrools-change-set-5.0.xsd> ' >

    <add>

         <resource basicAuthentication='enabled' username='admin'
password='admin'
source='http://ruleserver/drools-guvnor/org.drools.guvnor.Guvnor/package
/my.rule.package/LATEST
<http://ruleserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rul
e.package/LATEST> ' type='PKG' />

    </add>

</change-set>

Remember to replace username and password.

Best,

2010/6/30 Jeffrey Schneller <jeffrey.schneller at envisa.com>

Here is the xml file I am getting:

<change-set xmlns='http://drools.org/drools-5.0/change-set'

    xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'

    xs:schemaLocation='http://drools.org/drools-5.0/change-set
drools-change-set-5.0.xsd
<http://drools.org/drools-5.0/change-setdrools-change-set-5.0.xsd> ' >

    <add>

         <resource
source='http://ruleserver/drools-guvnor/org.drools.guvnor.Guvnor/package
/my.rule.package/LATEST' type='PKG' />

    </add>

</change-set>

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Esteban
Aliverti
Sent: Wednesday, June 30, 2010 3:18 PM
To: Rules Users List
Subject: Re: [rules-users] Drools and Guvnor 5.1M2 - Exception being
thrownin processChangeSet

Could you please post the xml file you are getting from
http://rulerserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rul
e.package/LATEST/ChangeSet.xml
<http://rulerserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.ru
le.package/LATEST/ChangeSet.xml> ?

Best,

2010/6/30 Jeffrey Schneller <jeffrey.schneller at envisa.com>

I am trying to upgrade to the 5.1M2 build from 5.0.1 and am running into
some issues.  I have installed the new 5.1 Guvnor and imported the rules
from my 5.0.1 Guvnor instance.  

I then removed the old 5.0.1 drools jars from my app and replaced them
with the 5.1M2 drools jars.  I was also added all the dependent
libraries.  The code that worked with the 5.0.1 version does not work
with the 5.1M2 version.  In 5.0.1 I was constructing the xml and
streaming it into the applyChangeSet method.  With 5.1M2 I am just
pointing to the change set xml file that is in the Guvnor. 

I am seeing a NullPointerException being thrown  in the processChangeSet
method as shown below.

Caused by: java.lang.NullPointerException

                at
org.drools.agent.impl.KnowledgeAgentImpl.processChangeSet(KnowledgeAgent
Impl.java:171)

                at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm
pl.java:143)

                at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm
pl.java:130)

Did I miss something?  Am I doing something wrong?  Below is the code
that I have.

                 KnowledgeAgentConfiguration kaconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();

                 kaconf.setProperty( "drools.agent.scanDirectories",
"true" ); 

                 kaconf.setProperty("drools.agent.newInstance",
"false");

ResourceFactory.getResourceChangeScannerService().start();

ResourceFactory.getResourceChangeNotifierService().start();

                String url =
"http://rulerserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.ru
le.package/LATEST/ChangeSet.xml";

                KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent( "Configuration", kaconf );

                kagent.setSystemEventListener(new MyDroolsListener());

try {

kagent.applyChangeSet(ResourceFactory.newUrlResource(new URL(url)));
// ERROR IS OCCURING INSIDE OF applyChangeSet

                } catch (MalformedURLException e) {

                                e.printStackTrace();

                }

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