[rules-users] Guvnor example how to access rules in database instead sample.drl file?

[richard]

Guvnor - Version 5.4.0.Final
\drools-examples\drools-examples-brms\mortgage-example

I get this error.

java.lang.RuntimeException: KnowledgeAgent exception while trying to
deserialize KnowledgeDefinitionsPackage  
	at
org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:776)
	at
org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1071)
	at
org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:824)
	at
org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:673)
	at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:203)
	at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:182)
	at
org.drools.guvnor.examples.mortgage.client.MortgageClientExample.readKnowledgeBase(MortgageClientExample.java:92)
	at
org.drools.guvnor.examples.mortgage.client.MortgageClientExample.main(MortgageClientExample.java:49)
Caused by: java.io.FileNotFoundException:
http://localhost:8080/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST
	at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1434)
	at org.drools.io.impl.UrlResource.grabStream(UrlResource.java:210)
	at org.drools.io.impl.UrlResource.getInputStream(UrlResource.java:146)
	at
org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:748)
	... 7 more
Exception in thread "main" java.lang.NullPointerException
	at java.util.AbstractCollection.addAll(AbstractCollection.java:303)
	at
org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1077)
	at
org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:824)
	at
org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:673)
	at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:203)
	at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:182)
	at
org.drools.guvnor.examples.mortgage.client.MortgageClientExample.readKnowledgeBase(MortgageClientExample.java:92)
	at
org.drools.guvnor.examples.mortgage.client.MortgageClientExample.main(MortgageClientExample.java:49)

/*
 * Copyright 2011 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.guvnor.examples.mortgage.client;

import javax.swing.JOptionPane;

import org.drools.KnowledgeBase;
import org.drools.agent.KnowledgeAgent;
import org.drools.agent.KnowledgeAgentFactory;
import org.drools.definition.type.FactType;
import org.drools.io.Resource;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;

public class MortgageClientExample {

    /**
     * Entry point demonstrating use of KnowledgeAgent and changesets
retrieving
     * a rule package from a running instance of Guvnor.
     * @param args
     */
    public static void main(String[] args) {

        JOptionPane.showMessageDialog(null, "This example makes a few
assumptions:\n" +
                "- Start the app server on localhost on port 8080.\n" +
                "- Rename the guvnor war to guvnor.war and deploy it to the
app server.\n" +
                "- Surf to Guvnor and log in.\n" +
                "- In the menu Administration, Import/Export, import
/exported-repositories/mortgage-sample-repository.xml\n" +
                "- Refresh the browser, open menu Package, click Rebuild all
packages.\n" +
                "Click OK when this is done.", "Preparation",
JOptionPane.INFORMATION_MESSAGE);

        StatefulKnowledgeSession ksession = null;
        try {
            // load up the knowledge base
            KnowledgeBase kbase = readKnowledgeBase();

            // Dynamic fact creation as the model was declared in the DRL
            FactType appType = kbase.getFactType("mortgages",
"LoanApplication");
            Object application = appType.newInstance();
            appType.set(application, "amount", 25000);
            appType.set(application, "deposit", 1500);
            appType.set(application, "lengthYears", 20);

            FactType incomeType = kbase.getFactType("mortgages",
"IncomeSource");
            Object income = incomeType.newInstance();
            incomeType.set(income, "type", "Job");
            incomeType.set(income, "amount", 65000);

            // Invoke the magic
            ksession = kbase.newStatefulKnowledgeSession();
            ksession.insert(application);
            ksession.insert(income);
            ksession.fireAllRules();

            // Voila!
            String message = "The loan application is now:\n" + application;
            System.out.println(message);
            JOptionPane.showMessageDialog(null, message, "Result",
JOptionPane.INFORMATION_MESSAGE);
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } finally {
            if (ksession != null) {
                ksession.dispose();
            }
        }
    }

    /**
     * Load KnowledgeBase using KnowledgeAgent configured with accompanying
changeset xml
     * @return A KnowledgeBase
     */
    private static KnowledgeBase readKnowledgeBase() {
        KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent("MortgageAgent");
        Resource changeset = ResourceFactory.newClassPathResource(
               
"org/drools/guvnor/examples/mortgage/mortgage-changeset.xml");
        kagent.applyChangeSet(changeset);
        KnowledgeBase kbase = kagent.getKnowledgeBase();
        kagent.dispose();
        return kbase;
    }

}




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