We try to switch to Drools 6 with the all new KIE workbench (formerly known as Guvnor) and the new maven-based artifacts.
Now I'd like to use the the system described in this blog post in the second image ("Deployment"): Loading the rules via HTTP from the workbench repository (the dotted arrow, going from HTTP on the left directly into the application).
The problem is, that I have no idea how to load the artifact into my KieServices/KieModule object. I basically do not want to use maven, I also cannot provide the path to maven's settings.xml
globally as a Java parameter, so this option is out.
I think that a similar issue is this one. As mentioned there, I also tried to load an URL resource but the problem seems to be that the system cannot determine, what kind of ResourceType
the given URL (http://localhost:8080/kie-drools/maven2/.../-1.0.0.jar
) is. And yes, I can access the .jar from the repository directly from the browser, without authentication.
Any ideas or tutorials how to do this?
My testing code:
public static void main(String[] args) {
KieServices ks = KieServices.Factory.get();
KieRepository repo = ks.getRepository();
String url = "http://localhost:8080/kie-drools/maven2/de/test/test/1.0.0/test-1.0.0.jar";
Resource urlResource = ks.getResources().newUrlResource(url);
KieModule kModule = repo.addKieModule(urlResource); // this already fails
}
The error:
Exception in thread "main" java.lang.RuntimeException: Unable to fetch module from resource :[UrlResource path='http://localhost:8080/kie-drools/maven2/de/itm/Herma400/1.0.1/Herma400-1.0.1.jar']
at org.drools.compiler.kie.builder.impl.KieRepositoryImpl.getKieModule(KieRepositoryImpl.java:205)
at org.drools.compiler.kie.builder.impl.KieRepositoryImpl.addKieModule(KieRepositoryImpl.java:161)
at kieTest.MainKieTest.main(MainKieTest.java:24)
Caused by: java.lang.NullPointerException
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.getPomProperties(ClasspathKieProject.java:197)
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.fetchKModule(ClasspathKieProject.java:148)
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.fetchKModule(ClasspathKieProject.java:109)
at org.drools.compiler.kie.builder.impl.KieRepositoryImpl.getKieModule(KieRepositoryImpl.java:190)
... 2 more
Thanks in advance!
I finally managed to get this solved. Below is a working example which loads the Drools artifact from the KIE-repository via HTTP and executes the rules:
package kieTest;
import java.util.Scanner;
import org.drools.compiler.kproject.ReleaseIdImpl;
import org.kie.api.KieServices;
import org.kie.api.builder.KieScanner;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.StatelessKieSession;
public class MainKieTest {
public static void main(String[] args) {
// works even without -SNAPSHOT versions
String url = "http://localhost:8080/kie-drools/maven2/de/test/Test/1.2.3/Test-1.2.3.jar";
// make sure you use "LATEST" here!
ReleaseIdImpl releaseId = new ReleaseIdImpl("de.test", "Test", "LATEST");
KieServices ks = KieServices.Factory.get();
ks.getResources().newUrlResource(url);
KieContainer kieContainer = ks.newKieContainer(releaseId);
// check every 5 seconds if there is a new version at the URL
KieScanner kieScanner = ks.newKieScanner(kieContainer);
kieScanner.start(5000L);
// alternatively:
// kieScanner.scanNow();
Scanner scanner = new Scanner(System.in);
while (true) {
runRule(kieContainer);
System.out.println("Press enter in order to run the test again....");
scanner.nextLine();
}
}
private static void runRule(KieContainer kieKontainer) {
StatelessKieSession kSession = kieKontainer.newStatelessKieSession("testSession");
kSession.setGlobal("out", System.out);
kSession.execute("testRuleAgain");
}
}
When searching for the solution, I found the following links helpful:
- http://www.skills421.com/tutorials-drools-components.jsp
- http://blog.athico.com/2013/12/deployment-with-drools-60.html
I hope someone finds this useful when getting SO as first search result ;-)
The code above uses maven and kie-ci. The URLResource you create is not used.
Here's a working sample :
String url = "http://localhost:8080/kie-drools-wb/maven2/groupId/artifactId/1.0/artifactId-1.0.jar";
KieServices ks = KieServices.Factory.get();
KieRepository kr = ks.getRepository();
UrlResource urlResource = (UrlResource) ks.getResources()
.newUrlResource(url);
urlResource.setUsername("admin");
urlResource.setPassword("password");
urlResource.setBasicAuthentication("enabled");
InputStream is = urlResource.getInputStream();
KieModule kModule = kr.addKieModule(ks.getResources()
.newInputStreamResource(is));
KieContainer kContainer = ks.newKieContainer(kModule.getReleaseId());
kContainer.newStatelessKieSession();
Note that you still need to tweak a bit to allow this to work with the KieScanner.
Here are the steps, All the steps are mandatory
Add kie-clie dependency in your pom
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-ci</artifactId>
<version>6.2.0.Final</version>
</dependency>
Add your KIE workbench maven repo to your pom.xml
<repository>
<id>guvnor-m2-repo</id>
<name>Guvnor M2 Repo</name>
<url>http://localhost:8080/drools/maven2wb/</url>
</repository>
Add the dependency to your pom.xml
<dependency>
<groupId>groupId</groupId>
<artifactId>artifactId</artifactId>
<version>LATEST</version>
</dependency>
Provide your repo credentials into settings.xml
<server>
<id>guvnor-m2-repo</id>
<username>admin</username>
<password>@dmin</password>
</server>
Java code
KieServices ks = KieServices.Factory.get();
ReleaseId releaseId = ks.newReleaseId("groupID", "artifactID", "LATEST");
KieContainer kieContainer = ks.newKieContainer(releaseId);
KieSession kieSession = kieContainer.newKieSession();
kieSession.insert(object);
kieSession.fireAllRules();