Hi all,
I'm trying to migrate my JBoss v3.0.6 rules to the latest v4.0.0
release. I could already resolve some issues but now I'm already stuck
for hours with a NullPointerException that I can't get rid of. I broke
the problem down to a relatively small set of test files that I'd like
to show you here:
/* SimpleTest.java */
package com.sample;
// ... imports removed for brevity
public class SimpleTest {
public static final void main(String[] args) throws Exception {
PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl(new InputStreamReader(SimpleTest.class
.getResourceAsStream("/rf1.drl")));
builder.addPackageFromDrl(new InputStreamReader(SimpleTest.class
.getResourceAsStream("/rf2.drl")));
RuleBase rb = RuleBaseFactory.newRuleBase();
rb.addPackage(builder.getPackage());
WorkingMemory wm = rb.newStatefulSession();
wm.insert(new Task()); // <-- crashes here
wm.fireAllRules();
}
}
/* Task.java */
package com.sample;
public class Task {
private String next = null;
public String getNext() {
return next;
}
public void setNext(String next) {
this.next = next;
}
}
// rf1.drl
package com.sample
rule "r0"
when
Task( next == null ); # <-- change to "x"
then
System.out.println("r0");
end
rule "r1"
when
Task( next == "1" );
then
System.out.println("r1");
end
// rf2.drl
package com.sample
rule "r2"
when
Task( next == "2" );
then
System.out.println("r1");
end
As you can see there are two Drools rule files and two Java classes. If
I run the SimpleTest class, I get the following exception:
Exception in thread "main" java.lang.NullPointerException
at
org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.equals(CompositeObjectSinkAdapter.java:608)
at
org.drools.util.AbstractHashTable$EqualityEquals.equal(AbstractHashTable.java:345)
at org.drools.util.ObjectHashMap.get(ObjectHashMap.java:86)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:295)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168)
at org.drools.reteoo.Rete.assertObject(Rete.java:168)
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:848)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:822)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:623)
at com.sample.SimpleTest.main(SimpleTest.java:22)
I've marked the position in the source code at which the run crashes.
Does anybody have an idea what's wrong here?
Some more strange things relating to this problem:
* If I change the 'null' in rf1.drl to '""' (empty string), the
problem remains.
* If I change the 'null' in rf1.drl to '"x"' (or some other non-empty
string), then the exception is gone.
* If I remove any of the two rule files, the exception is gone, too.
Any ideas? Should I file a bug?
Thanks in advance!
Cheers,
Christian
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fn:Christian Spurk
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org:DFKI GmbH;Language Technology Lab
adr;quoted-printable:;;Stuhlsatzenhausweg 3;Saarbr=C3=BCcken;;66123;Germany
email;internet:[EMAIL PROTECTED]
title:Dipl.-Ling. (Computerlinguistik)
tel;work:+49681/302-5354
note;quoted-printable:Deutsches Forschungszentrum f=C3=BCr K=C3=BCnstliche Intelligenz GmbH=0D=0A=
Firmensitz: Trippstadter Stra=C3=9Fe 122, D-67663 Kaiserslautern=0D=0A=
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Gesch=C3=A4ftsf=C3=BChrung:=0D=0A=
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Dr. Walter Olthoff=0D=0A=
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Vorsitzender des Aufsichtsrats:=0D=0A=
Prof. Dr. h.c. Hans A. Aukes=0D=0A=
=0D=0A=
Amtsgericht Kaiserslautern, HRB 2313=0D=0A=
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version:2.1
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