4:54 a.m.
Accumulate with from chaining fails with Rule Compilation Error when reverse is used
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Key: JBRULES-2403
URL: https://jira.jboss.org/jira/browse/JBRULES-2403
Project: Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: drools-compiler
Affects Versions: 5.0.1.FINAL
Environment: Eclipse Galileo, JDK 1.6 (64-bit), Drools 5.0.1, Vista 64-bit
Reporter: hoogenbj
Assignee: Mark Proctor
Hi,
While trying to upgrade from Drools 4.0.7 to Drools 5.0.1 I noticed a problem with the
rules that use accumulate-with-from-chaining.
If there is a reverse action, then I get a Rule Compilation error:
java.lang.RuntimeException: Rule Compilation error : [Rule name='Accumulate with From
Chaining']
org/drools/Rule_Accumulate_with_From_Chaining_0.java (11:62) : File
org/drools/Rule_Accumulate_with_From_Chaining_0.java, Line 11, Column 62: Operator
"[" expected
at org.drools.TestKnowledgeBuilder.test(TestKnowledgeBuilder.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
It works fine with Drools 4.0.7.
If the "reverse" is removed, then the rule compiles fine. So I guess that is the
workaround - but only if you don't need the reverse.
I have an eclipse project that demonstrates the problem but there does not seem to be a
way to upload it.
Here's what the rule looks like:
package org.drools;
import java.util.List;
import java.util.ArrayList;
global java.util.List results;
rule "Accumulate with From Chaining" salience 80
when
$cheesery : Cheesery()
$person : Person( $likes : likes )
$list : List( size > 2 )
from accumulate( $cheese : Cheese( type == $likes ) from
$cheesery.getCheeses(),
init( List l = new ArrayList(); ),
action( l.add( $cheese ); ),
reverse( l.remove( $cheese ); ),
result( l ) )
then
results.add( $list );
end
I modified test_AccumulateWithFromChaining.drl in
drools-5.0\src\drools-compiler\src\test\resources\org\drools\integrationtests for my
test.
Here is my test code:
Properties props = new Properties();
props.setProperty("drools.dialect.java.compiler", "JANINO");
KnowledgeBuilderConfiguration config =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props,
this.getClass().getClassLoader());
KnowledgeBuilder knowledgeBuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(config);
knowledgeBuilder.add(ResourceFactory.newInputStreamResource(getClass().getResourceAsStream(
"test_AccumulateWithFromChaining.drl" )), ResourceType.DRL);
if (knowledgeBuilder.hasErrors()) {
throw new RuntimeException(knowledgeBuilder.getErrors().toString());
}
which results in a RuntimeException.
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