5:35 p.m.
[
https://jira.jboss.org/browse/JBRULES-2527?page=com.atlassian.jira.plugin...
]
Mark Proctor commented on JBRULES-2527:
---------------------------------------
I could not recreate this problem using this unit test:
public void testFieldBindingOnWrongFieldName() {
String str = "";
str += "package org.drools\n";
str += "import org.drools.Person\n";
str += "global java.util.List mlist\n";
str += "rule rule1 \n";
str += "when\n";
str += "$a : Person( $f : invalidFieldName, name == \"a\"
)\n";
str += "then\n";
str += " mlist.add( $f );\n";
str += "end\n";
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ),
ResourceType.DRL );
if ( kbuilder.hasErrors() ) {
fail( kbuilder.getErrors().toString() );
}
Person a = new Person( "a" );
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
List mlist = new ArrayList();
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
ksession.setGlobal( "mlist",
mlist );
ksession.insert( a );
ksession.fireAllRules();
ksession.dispose();
}
I get this error:
junit.framework.AssertionFailedError: Unable to create Field Extractor for
'invalidFieldName' : [Rule name='rule1']
org.drools.RuntimeDroolsException: Field/method 'invalidFieldName' not found for
class 'org.drools.Person'Rule Compilation error : [Rule name='rule1']
org/drools/Rule_rule1_0.java (7:352) : $f cannot be resolved
at junit.framework.Assert.fail(Assert.java:47)
at
org.drools.integrationtests.MiscTest.testFieldBindingOnWrongFieldName(MiscTest.java:6309)
Can you recreate your problem by tweaking the above test?
NullPointerException during rule compilation on
entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable
compiler error because the getter doesn't exist
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Key: JBRULES-2527
URL: https://jira.jboss.org/browse/JBRULES-2527
Project: Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: drools-compiler (expert)
Affects Versions: 5.1.0.M2
Reporter: Geoffrey De Smet
Assignee: Edson Tirelli
Priority: Minor
Fix For: FUTURE
When adding this rule, I got a NullPointerException:
rule "myRule"
when
MyFact(
...
$myVariable : wrongGetterName
)
...
end
It crashes in
PatternBuilder.getDeclarationsMap(PatternBuilder.java:666) (With that line number it
must be evil! :))
on this line:
declarations.put( entry.getKey(),
entry.getValue().getExtractor().getExtractToClass() );
and in debug it shows that
entry.getValue() is $myVariable
and that
entry.getValue().getExtractor() is null
which makes .getExtractToClass() give the NPE
It turns out that MyFact.getWrongGetterName() doesn't exist (it should be
MyFact.getCorrectGetterName()).
Exception in thread "main" java.lang.NullPointerException
at org.drools.rule.builder.PatternBuilder.getDeclarationsMap(PatternBuilder.java:666)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:599)
at org.drools.rule.builder.PatternBuilder.buildConstraint(PatternBuilder.java:269)
at org.drools.rule.builder.PatternBuilder.buildConstraint(PatternBuilder.java:294)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:213)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:108)
at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:69)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:79)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1142)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:628)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:252)
at
org.drools.planner.config.localsearch.LocalSearchSolverConfig.buildRuleBase(LocalSearchSolverConfig.java:193)
at
org.drools.planner.config.localsearch.LocalSearchSolverConfig.buildSolver(LocalSearchSolverConfig.java:170)
at
org.drools.planner.config.XmlSolverConfigurer.buildSolver(XmlSolverConfigurer.java:77)
at
org.drools.planner.examples.nurserostering.app.NurseRosteringApp.createSolver(NurseRosteringApp.java:31)
at
org.drools.planner.examples.common.app.CommonApp.createSolutionBusiness(CommonApp.java:43)
at org.drools.planner.examples.common.app.CommonApp.<init>(CommonApp.java:22)
at
org.drools.planner.examples.nurserostering.app.NurseRosteringApp.<init>(NurseRosteringApp.java:18)
at
org.drools.planner.examples.nurserostering.app.NurseRosteringApp.main(NurseRosteringApp.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:110)
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