dcdh opened a new issue, #6248:
URL: https://github.com/apache/incubator-kie-drools/issues/6248
Hello,
I am dynamically loading a rule at runtime this way:
```java
@Path("/shouldServerBeValid")
@POST
public boolean shouldServerBeValid() {
final KieServices kieServices = KieServices.Factory.get();
final KieFileSystem kieFileSystem = getKieFileSystem(kieServices);
kieServices.newKieBuilder(kieFileSystem).buildAll();
final KieContainer kContainer =
kieServices.newKieContainer(kieServices.getRepository().getDefaultReleaseId());
final KieBase kieBase = kContainer.getKieBase();
for (final KiePackage kp : kieBase.getKiePackages() ) {
for (final Rule rule : kp.getRules()) {
Log.info("kp " + kp + " rule " + rule.getName());
}
}
try (final KieSession session = kieBase.newKieSession()) {
final Server s1 = new Server("rhel7", 2, 1024, 2048);
session.insert(s1);
session.fireAllRules();
return s1.isValid();
}
}
private KieFileSystem getKieFileSystem(final KieServices kieServices) {
final KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
// language=drl
final String externalDrl = """
import org.acme.Server
dialect "java"
rule "Check Server Configuration"
when
$server : Server( processors < 2 || memory<=1024 ||
diskspace <= 2048)
then
$server.setValid(false);
System.out.println("Server "+ $server.getName() + "
configuration does not meet requirements!");
end
""";
kieFileSystem.write("src/main/resources/rules/external.drl",
externalDrl);
return kieFileSystem;
}
```
With these maven dependencies:
```xml
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-quarkus</artifactId>
<version>10.0.0</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-ruleunits-engine</artifactId>
<version>10.0.0</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>10.0.0</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-mvel</artifactId>
<version>10.0.0</version>
</dependency>
```
Running it will lead to this exception:
```
Suppressed: java.lang.NullPointerException: Cannot invoke
"org.drools.compiler.compiler.Dialect.analyzeExpression(org.drools.compiler.rule.builder.PackageBuildContext,
org.drools.drl.ast.descr.BaseDescr, Object,
org.drools.compiler.compiler.BoundIdentifiers)" because the return value of
"org.drools.compiler.rule.builder.RuleBuildContext.getDialect()" is null
at
org.drools.compiler.rule.builder.PatternBuilder.buildAnalysis(PatternBuilder.java:1585)
at
org.drools.compiler.rule.builder.PatternBuilder.buildEval(PatternBuilder.java:1508)
at
org.drools.compiler.rule.builder.PatternBuilder.createAndBuildPredicate(PatternBuilder.java:1390)
at
org.drools.compiler.rule.builder.PatternBuilder.buildExpression(PatternBuilder.java:998)
at
org.drools.compiler.rule.builder.PatternBuilder.buildCcdDescr(PatternBuilder.java:957)
at
org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:767)
at
org.drools.compiler.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:611)
at
org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:179)
at
org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:145)
at
org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:127)
at
org.drools.compiler.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:68)
at
org.drools.compiler.rule.builder.RuleBuilder.build(RuleBuilder.java:100)
at
org.drools.compiler.builder.impl.processors.ImmutableRuleCompilationPhase.internalAddRule(ImmutableRuleCompilationPhase.java:342)
at
org.drools.compiler.builder.impl.processors.ImmutableRuleCompilationPhase.addRule(ImmutableRuleCompilationPhase.java:337)
at
org.drools.compiler.builder.impl.processors.ImmutableRuleCompilationPhase.compileRulesLevel(ImmutableRuleCompilationPhase.java:301)
at
org.drools.compiler.builder.impl.processors.ImmutableRuleCompilationPhase.process(ImmutableRuleCompilationPhase.java:85)
at
java.base/java.util.Arrays$ArrayList.forEach(Arrays.java:4305)
at
org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileKnowledgePackages(KnowledgeBuilderImpl.java:457)
at
org.drools.compiler.builder.impl.KnowledgeBuilderImpl.buildRules(KnowledgeBuilderImpl.java:1016)
at
org.drools.compiler.builder.impl.KnowledgeBuilderImpl.doFirstBuildStep(KnowledgeBuilderImpl.java:990)
at
org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:119)
at
org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:109)
at
org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:280)
at
org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:220)
at
org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:84)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:285)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:251)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:198)
at
org.acme.RuntimeEndpoint.shouldServerBeValid(RuntimeEndpoint.java:53)
at
org.acme.RuntimeEndpoint$quarkusrestinvoker$shouldServerBeValid_91e5a3b77fe1b0322ebde70ff08c3aabb2e3173b.invoke(Unknown
Source)
at
org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
```
The getDialect() returns null from this point because it will define it to
"mvel"
https://github.com/kiegroup/drools/blob/ee4c7c6a6c3753cc5e6abc76c5f5e0ebca62c9a1/drools-compiler/src/main/java/org/drools/compiler/rule/builder/PatternBuilder.java#L1386
```java
protected Constraint createAndBuildPredicate(RuleBuildContext context,
Pattern pattern,
BaseDescr base,
String expr,
Map<String, OperatorDescr>
aliases) {
Dialect dialect = context.getDialect();
context.setDialect(context.getDialect("mvel"));
PredicateDescr pdescr = new
PredicateDescr(context.getRuleDescr().getResource(), expr);
pdescr.copyParameters(base);
pdescr.copyLocation(base);
Constraint evalConstraint = buildEval(context, pattern, pdescr,
aliases, expr, false);
// fall back to original dialect
context.setDialect(dialect);
return evalConstraint;
}
```
To fix this exception I had to a dependency on mvel even if I do not use it.
```xml
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-mvel</artifactId>
<version>10.0.0</version>
</dependency>
```
Regards,
Damien
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