3:25 a.m.
Hello everybody,
I would appreciate some help with the compilation of a rule that involves
dynamically generated POJOs (minimal example at the end of the mail).
When I add the packages of the generated POJOs manually to the imported
packages of my Eclipse plug-in that executes the knowledge session
everything works fine.
When I use my custom classloader (that successfully loads all involved
classes, I checked this thoroughly) I get the following errors:
Unable to generate rule invoker. lts cannot be resolved to a type
Rule Compilation error lts cannot be resolved to a type
Do I need to change my rules just because the involved classes are now
loaded using my custom classloader?
Thanks for your help!
M. Kramer
This is the rule that only works if the package "lts" is listed under
"Import-Package" in the MANIFEST.MF:
import java.lang.String;
import java.util.ArrayList;
import java.util.HashMap;
import org.eclipse.emf.ecore.EObject;
global java.lang.String output;
global java.util.List list;
global java.util.List pclist;
rule "Aspect"
when
$s0Decl: lts.State(name == "a")
$s0: lts.State(this == $s0Decl)
then
java.util.List param = new ArrayList<HashMap<String,EObject>>();
java.util.List ids = new ArrayList<String>();
param.add($s0);
ids.add("0");
list.add(param);
pclist.add(ids);
end
This is the code that I am using to execute the rule:
void executeKnowledgeSession(String droolsRules, URLClassLoader
urlClassLoader, Iterable<EObject> iterable) {
KnowledgeBuilderConfiguration kBuilderConfiguration =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,
urlClassLoader);
KnowledgeBuilder knowledgeBuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(kBuilderConfiguration);
Resource droolsRulesResource =
ResourceFactory.newByteArrayResource(droolsRules.getBytes());
knowledgeBuilder.add(droolsRulesResource, ResourceType.DRL);
if (knowledgeBuilder.hasErrors()) {
...
}
KnowledgeBaseConfiguration kBaseConfiguration =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null, urlClassLoader);
KnowledgeBase knowledgeBase =
KnowledgeBaseFactory.newKnowledgeBase(kBaseConfiguration);
knowledgeBase.getKnowledgePackages().clear();
knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages());
StatelessKnowledgeSession knowledgeSession =
knowledgeBase.newStatelessKnowledgeSession();
knowledgeSession.setGlobal(...);
// execute the knowledge session
knowledgeSession.execute(iterable);
}
These are the exact errors that I get:
Unable to generate rule invoker. lts cannot be resolved to a type
lts cannot be resolved to a type
Rule Compilation error lts cannot be resolved to a type
Unable to generate rule invoker. : [Rule name='Aspect']
defaultpkg/Rule_Aspect_0DefaultConsequenceInvoker.java (22:883) : lts
cannot be resolved to a type
defaultpkg/Rule_Aspect_0DefaultConsequenceInvoker.java (22:901) : lts
cannot be resolved to a type
Rule Compilation error : [Rule name='Aspect']
defaultpkg/Rule_Aspect_0.java (6:322) : lts cannot be resolved to a type
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9:25 a.m.
Hello,
could it be that the same rules compile with the standard classloader but
not with a custom one because of "declared types"? I found some pointers to
this in older posts but got no clue what it is or how I can use it to get my
apparently correct rules to compile. Any ideas?
Thanks,
M. Kramer
P.S. In case you consider my example incomplete because the code for the
business class State is missing: it is the plain code that is generated by
EMF for a metaclass with a single String attribute name:
public interface State extends EObject
{
String getName();
void setName(String value);
}
public class StateImpl extends EObjectImpl implements State
{
protected static final String NAME_EDEFAULT = null;
protected String name = NAME_EDEFAULT;
protected StateImpl()
{
super();
}
@Override
protected EClass eStaticClass()
{
return LtsPackage.Literals.STATE;
}
public String getName()
{
return name;
}
public void setName(String newName)
{
String oldName = name;
name = newName;
if (eNotificationRequired())
eNotify(new ENotificationImpl(this, Notification.SET,
LtsPackage.STATE__NAME, oldName, name));
}
public Object eGet(int featureID, boolean resolve, boolean coreType)
{
switch (featureID)
{
case LtsPackage.STATE__NAME:
return getName();
}
return super.eGet(featureID, resolve, coreType);
}
@SuppressWarnings("unchecked")
@Override
public void eSet(int featureID, Object newValue)
{
switch (featureID)
{
case LtsPackage.STATE__NAME:
setName((String)newValue);
return;
}
super.eSet(featureID, newValue);
}
@Override
public void eUnset(int featureID)
{
switch (featureID)
{
case LtsPackage.STATE__NAME:
setName(NAME_EDEFAULT);
return;
}
super.eUnset(featureID);
}
@Override
public boolean eIsSet(int featureID)
{
switch (featureID)
{
case LtsPackage.STATE__NAME:
return NAME_EDEFAULT == null ? name != null :
!NAME_EDEFAULT.equals(name);
}
return super.eIsSet(featureID);
}
@Override
public String toString()
{
if (eIsProxy()) return super.toString();
StringBuffer result = new StringBuffer(super.toString());
result.append(" (name: ");
result.append(name);
result.append(')');
return result.toString();
}
}
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M. Kramer