[jboss-jira] [JBoss JIRA] (DROOLS-920) DRL compiler throws NPE if you import a class from default package

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-920.
--------------------------------
    Resolution: Rejected


This is not a Drools bug but a well known Java limitation. From the Java language spec:

"It is a compile time error to import a type from the unnamed package."

See http://stackoverflow.com/questions/2193226/how-to-import-a-class-from-default-package


> DRL compiler throws NPE if you import a class from default package
> ------------------------------------------------------------------
>
>                 Key: DROOLS-920
>                 URL: https://issues.jboss.org/browse/DROOLS-920
>             Project: Drools
>          Issue Type: Bug
>            Reporter: David Weir
>            Assignee: Mario Fusco
>         Attachments: DroolsLoopingTest.java, MyMessage.java
>
>
> I am working on a looping problem and built the attached test case. It gives me this error when I run it:
> Running DroolsLoopingTest
> Creating new session 
> SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
> SLF4J: Defaulting to no-operation (NOP) logger implementation
> SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
> Exception in thread "main" java.lang.NullPointerException
> 	at org.drools.compiler.builder.impl.ClassHierarchyManager.inheritFields(ClassHierarchyManager.java:164)
> 	at org.drools.compiler.builder.impl.TypeDeclarationBuilder.createBean(TypeDeclarationBuilder.java:214)
> 	at org.drools.compiler.builder.impl.TypeDeclarationBuilder.processTypeDeclarations(TypeDeclarationBuilder.java:128)
> 	at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildTypeDeclarations(CompositeKnowledgeBuilderImpl.java:274)
> 	at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackages(CompositeKnowledgeBuilderImpl.java:116)
> 	at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:104)
> 	at org.drools.compiler.kie.builder.impl.AbstractKieModule.buildKnowledgePackages(AbstractKieModule.java:238)
> 	at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:64)
> 	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:225)
> 	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:196)
> 	at DroolsLoopingTest.createInMemoryKieSystem(DroolsLoopingTest.java:146)
> 	at DroolsLoopingTest.runTest(DroolsLoopingTest.java:106)
> 	at DroolsLoopingTest.main(DroolsLoopingTest.java:40)



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