[jboss-jira] [JBoss JIRA] Created: (JBRULES-1034) NullPointerException in a simple test
NullPointerException in a simple test
-------------------------------------
Key: JBRULES-1034
URL: http://jira.jboss.com/jira/browse/JBRULES-1034
Project: JBoss Rules
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 4.0.0.GA
Reporter: Christian Spurk
Assigned To: Mark Proctor
Priority: Blocker
I have the class and rule files setup listed below and 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)
Following the setup of four files:
/* 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
I've marked the position in the source code at which the run crashes.
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.
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