[jboss-jira] [JBoss JIRA] (DROOLS-4669) Scanner is not using container ClassLoader

[Pavel Tavoda (Jira)]

Pavel Tavoda created DROOLS-4669:
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             Summary: Scanner is not using container ClassLoader
                 Key: DROOLS-4669
                 URL: https://issues.jboss.org/browse/DROOLS-4669
             Project: Drools
          Issue Type: Bug
          Components: core engine
    Affects Versions: 7.28.0.Final
         Environment: Java 11, Java 8, Linux Debian
            Reporter: Pavel Tavoda
            Assignee: Mario Fusco


I had issue with standard Spring project. My configuration ended with following exception:
{code:java}
Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath
	at org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:117)
{code}
Because of this I have to setup KieSession this way:
{code:java}
KieServices kieServices = KieServices.Factory.get();
ReleaseId kieRelease = kieServices.newReleaseId("sk.f4s", "encounter-rule", "1.0.0-SNAPSHOT");
KieContainer kieContainer = kieServices.newKieContainer(kieRelease, this.getClass().getClassLoader());
kieSession = kieContainer.newStatelessKieSession();
{code}
After this everything works fine. However I want to reload my kBase with scanner. I add following two lines:
{code:java}
kieScanner = kieServices.newKieScanner(kieContainer);
kieScanner.start(1000l);
{code}
After this following exception is raised:
{code}
Exception in thread "Timer-0" java.lang.RuntimeException: Unable to load dialect 'org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration:java:org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration'
	at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.addDialect(KnowledgeBuilderConfigurationImpl.java:394)
	at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.buildDialectConfigurationMap(KnowledgeBuilderConfigurationImpl.java:380)
	at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.init(KnowledgeBuilderConfigurationImpl.java:235)
	at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.init(KnowledgeBuilderConfigurationImpl.java:187)
	at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.<init>(KnowledgeBuilderConfigurationImpl.java:155)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.getBuilderConfiguration(AbstractKieProject.java:302)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.createKnowledgeBuilder(AbstractKieProject.java:288)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:213)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:75)
	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:271)
	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieModule(KieBuilderImpl.java:264)
	at org.drools.compiler.kie.builder.impl.InternalKieModule.build(InternalKieModule.java:120)
	at org.kie.scanner.KieRepositoryScannerImpl.updateKieModule(KieRepositoryScannerImpl.java:200)
	at org.kie.scanner.KieRepositoryScannerImpl.internalUpdate(KieRepositoryScannerImpl.java:185)
	at org.kie.scanner.KieRepositoryScannerImpl.internalUpdate(KieRepositoryScannerImpl.java:55)
	at org.drools.compiler.kie.builder.impl.AbstractKieScanner.scanNow(AbstractKieScanner.java:147)
	at org.drools.compiler.kie.builder.impl.AbstractKieScanner$ScanTask.run(AbstractKieScanner.java:127)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)
Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath
	at org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:117)
	at org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:78)
	at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.addDialect(KnowledgeBuilderConfigurationImpl.java:390)
	... 18 more
{code}
I guess reason is that scanner is not using ClassLoader from KieContainer. Of course it will be better to fix reason why 'The Eclipse JDT Core jar is not in the classpath' is raised anyway because I'm using just standard Spring Web project with two Spring contexts (application and Web) what is very standard approach. Compiler IS awailable on classpath only Drools classloader doesn't see it.



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