Java 8, drools 5.x and drools 7.x

Question

0.00/5 (No votes)

See more:

am using Drools 5.x (drools-compiler 5.2.1.Final, drools-decisiontables 5.4.0.Final, and drools-templates 5.4.0.Final; jbpm-flow 5.1.1.Final, jbpm-bmpn2 5.1.1.Final and with their respective dependencies) for my Java job, I build/run it with Java 1.7.0_21. My current set up works properly. I am using a decision table (spreadsheet).

I am able to build/run my project with Java 1.8.0_162 using drools 5.x as described above; however, when the java job runs it loads the decision table (spreadsheet) but it does not fire up any of the rules, I am not getting an exception in the last line that gets executed:

Java

Properties props = new Properties();
    
    KnowledgeBuilderConfiguration configuration = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props);
    
    KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newDecisionTableConfiguration(configuration);
    
    DecisionTableConfiguration config = KnowledgeBuilderFactory.newDecisionTableConfiguration();
    
    config.setInputType(DecisionTableInputType.XLS);
    
    kbuilder.add(ResourceFactory.newClassPathResource(spreadsheetFile), ResourcType.DTABLE, config);  // last line executed and then job exists and completes successfully.

Prior to the last line getting executed I put some debug logs and they show the following:

>> Properties (props):  {}

>> KnowledgeBuilderConfiguration (configuration): org.drools.compiler.PackageBuilderConfiguration@630cb4a4

>> KnowledgeBuilder (kbuilder):  org.drools.builder.impl.KnowledgeBuilderImpl@239bof9d

>> ResourceFactory.newClassPathResource(spreadsheetFile):  [ClassPathResource path='spreadsheet.xls']

>> ResourceType.DTABLE:  ResourceType = 'Decision Table'

>> DecisionTableConfiguration (config):  org.drools.builder.conf.impl.DecisionTableConfigurationImpl@150ab4ed

>> DecisionTableConfiguration (config.getInputType()):  XLS

So I decided to upgrade from drools 5.5.0 to 7.5.0 and use kie-api/kie-ci; I had to do some refactoring because now drools is part of the KIE (Knowledge Is Everything) umbrella, see the code below:

Java

KieServices ks = KieServices.Factory.get();
KieContainer kc = ks.getKieClasspathContainer();
KieSession ks = kc.newKieSession("ksession-dtables");  //stateful session
FactHandle fh = ks.insert(fact);
ks.fireAllRules();

....

The packages and rules are loaded into the Knowledge Base but only the first rules fire up and then it stops, do I need to upgrade my decision table (spreadsheet) in order to work for drools 7.5.0 with Java 8?

Any suggestions are welcome.

Thanks!!

What I have tried:

Figuring out if I need to modify my decision table (spreadsheet) and debug the code to find the culprit.

Posted 24-May-18 5:18am

Gibran Castillo

Updated 3-Aug-20 9:36am

Richard MacCutchan

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Gibran Castillo · Answer 1 · 2018-06-14T06:47:00

Solution 1

I used drools 6.5.0 and everything seems to work properly. It seems like drools 7.0.0 and higher use a different decision table (spreadsheet) format.

Posted 14-Jun-18 6:47am

Gibran Castillo

Updated 14-Jun-18 7:07am

Member 14905745 · Answer 2 · 2020-08-03T09:36:00

I worked on Drools on 2012 and again working on it now with 7 version.
Seems like Im able to make it work with this code

private void getKieRepository() {
if(kieServices == null) {
kieServices = KieServices.Factory.get();
}
final KieRepository kieRepository = kieServices.getRepository();
kieRepository.addKieModule(new KieModule() {
public ReleaseId getReleaseId() {
return kieRepository.getDefaultReleaseId();
}
});
}

@Bean
public KieSession getKieSession() {
System.setProperty("drools.dateformat","MMddyyyy");
getKieRepository();
generateDrl();
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_PATH + "rules.xlsx"));
KieBuilder kb = kieServices.newKieBuilder(kieFileSystem);
kb.buildAll();
Results results = kb.getResults();
if(results.hasMessages(Message.Level.ERROR)) {
for(Message message : results.getMessages()) {
System.out.println(message.getText());
}
throw new IllegalStateException("###errrors###");
}
KieModule kieModule = kb.getKieModule();
KieContainer kContainer = kieServices.newKieContainer(kieServices.getRepository().getDefaultReleaseId());
KieSession kieSession = kContainer.newKieSession();
return kContainer.newKieSession();
}