BRMS 6.2 throws NullPointerException when configuring RETEOO via system property

Issue

• When we set a reteoo algorithm, we got Nullpointer exception. It worked on 6.1.0 correctly. It seems this behavior have relevant with https://issues.jboss.org/browse/DROOLS-986 .

  public static final void main(String[] args) {
    try {           
      System.setProperty("drools.ruleEngine", "reteoo");
      KieServices ks = KieServices.Factory.get();
      KieContainer kContainer = ks.getKieClasspathContainer();
      KieSession kSession = kContainer.newKieSession("ksession-rules");

Console Error

java.lang.NullPointerException
    at org.drools.core.RuleBaseConfiguration.configureReteComponentFactory(RuleBaseConfiguration.java:953)
    at org.drools.core.RuleBaseConfiguration.setPhreakEnabled(RuleBaseConfiguration.java:791)
    at org.drools.core.RuleBaseConfiguration.init(RuleBaseConfiguration.java:495)
    at org.drools.core.RuleBaseConfiguration.init(RuleBaseConfiguration.java:429)
    at org.drools.core.RuleBaseConfiguration.<init>(RuleBaseConfiguration.java:420)
    at org.drools.core.impl.KnowledgeBaseFactoryServiceImpl.newKnowledgeBaseConfiguration(KnowledgeBaseFactoryServiceImpl.java:38)
    at org.kie.internal.KnowledgeBaseFactory.newKnowledgeBaseConfiguration(KnowledgeBaseFactory.java:125)
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.getKnowledgeBaseConfiguration(KieContainerImpl.java:516)
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.createKieBase(KieContainerImpl.java:497)
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.getKieBase(KieContainerImpl.java:440)
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:597)
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:568)
    at com.sample.DecisionTableTest.main(DecisionTableTest.java:20)