8:05 p.m.
If I've the simple classes:
public class ObjectBar{ public String name; gets/sets}
public class ObjectFoo{ public ObjectBar bar; gets/sets }
... and ObjectFoo this in WorkingMemory.
It's not possible navigate in objectFoo for make constraint in objectBar?
Example:
rule "Teste"
no-loop true
when
$foo: ObjectFoo(objectBar.name != "foobar")
then
System.out.println($foo);
end
... but:
org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@18488ef
Caused by: org.mvel.CompileException: unable to resolve property: nome
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
nome
Thanks
Alessandro Lazarotti
10:56 p.m.
According to your error it appears you had a typo somewhere. The error you
pasted in was looking for the property nome instead of name.
Alessandro Lazarotti wrote:
If I've the simple classes:
public class ObjectBar{ public String name; gets/sets}
public class ObjectFoo{ public ObjectBar bar; gets/sets }
... and ObjectFoo this in WorkingMemory.
It's not possible navigate in objectFoo for make constraint in objectBar?
Example:
rule "Teste"
no-loop true
when
$foo: ObjectFoo(objectBar.name != "foobar")
then
System.out.println($foo);
end
... but:
org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@18488ef
Caused by: org.mvel.CompileException: unable to resolve property: nome
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
nome
Thanks
Alessandro Lazarotti
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12:24 a.m.
Okay, I wrote a test case around the following and it works fine so let me
know if this isnt what you are working with...
Foo Class
public class Foo {
private String m_name;
public String getName()
{
return m_name;
}
public void setName(String nm)
{
m_name = nm;
}
}
Bar Class
public class Bar {
private Foo m_foo;
public Foo getFoo()
{
return m_foo;
}
public void setFoo(Foo f)
{
m_foo = f;
}
public String toString()
{
return "I have a foo with a name of " + m_foo.getName();
}
}
DRL Rule
rule "FooBar Rule"
when
$bar : Bar( foo.name != "Wrong" )
then
System.out.println("Test Successful - " + $bar.toString());
end
Junit Test Case
public void testProperties()
{
try
{
final Reader source = new InputStreamReader(
FooBarTest.class.getResourceAsStream( "FooBar.drl" ) );
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl(source);
if ( builder.hasErrors() ) {
System.out.println( builder.getErrors().toString() );
throw new RuntimeException( "Unable to compile
\"FooBar.drl\".");
}
//get the compiled package (which is serializable)
final Package pkg = builder.getPackage();
//add the package to a rulebase (deploy the rule package).
ruleBase.addPackage( pkg );
final StatefulSession session = ruleBase.newStatefulSession();
Foo foo = new Foo();
foo.setName("Test");
Bar bar = new Bar();
bar.setFoo(foo);
session.insert(bar);
session.fireAllRules();
}
catch (Exception e)
{
System.out.println(e.getMessage());
e.printStackTrace();
fail(e.getMessage());
}
}
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1:09 a.m.
Alessandro:
I wrote a test case and some classes around your example and mailed them to
you, I was not able to get them to post on this list for some reason.
Thanks...Michael
Alessandro Lazarotti wrote:
Hi, Michael...
The code that I wrote has a property "name" and not "nome". Sorry,
the
example not is the same that the Exception.
But ocurr the same error.
org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@18488ef
Caused by: org.mvel.CompileException: unable to resolve property: name
Caused by: org.mvel.PropertyAccessException: unable to resolve
property:name
Michael B. escreveu:
According to your error it appears you had a typo somewhere. The error
you
pasted in was looking for the property nome instead of name.
Alessandro Lazarotti wrote:
If I've the simple classes:
public class ObjectBar{ public String name; gets/sets}
public class ObjectFoo{ public ObjectBar bar; gets/sets }
... and ObjectFoo this in WorkingMemory.
It's not possible navigate in objectFoo for make constraint in objectBar?
Example:
rule "Teste"
no-loop true
when
$foo: ObjectFoo(objectBar.name != "foobar")
then
System.out.println($foo);
end
... but:
org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@18488ef
Caused by: org.mvel.CompileException: unable to resolve property: nome
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
nome
Thanks
Alessandro Lazarotti
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2:04 a.m.
Thanks Michael, I simulate.. your rule fire with successful.
I discovered the problem. The object in property (like Foo in your
example), when null, it's not throws NullPointerException, but
"org.mvel.PropertyAccessException: unable to resolve property".
With that, I never imagined that the problem was nullPointer, but I
thought about any access visibility (duh!).
[]'s
Alessandro
Michael B. escreveu:
Okay, I wrote a test case around the following and it works fine so
let me
know if this isnt what you are working with...
Foo Class
public class Foo {
private String m_name;
public String getName()
{
return m_name;
}
public void setName(String nm)
{
m_name = nm;
}
}
Bar Class
public class Bar {
private Foo m_foo;
public Foo getFoo()
{
return m_foo;
}
public void setFoo(Foo f)
{
m_foo = f;
}
public String toString()
{
return "I have a foo with a name of " + m_foo.getName();
}
}
DRL Rule
rule "FooBar Rule"
when
$bar : Bar( foo.name != "Wrong" )
then
System.out.println("Test Successful - " + $bar.toString());
end
Junit Test Case
public void testProperties()
{
try
{
final Reader source = new InputStreamReader(
FooBarTest.class.getResourceAsStream( "FooBar.drl" ) );
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl(source);
if ( builder.hasErrors() ) {
System.out.println( builder.getErrors().toString() );
throw new RuntimeException( "Unable to compile
\"FooBar.drl\".");
}
//get the compiled package (which is serializable)
final Package pkg = builder.getPackage();
//add the package to a rulebase (deploy the rule package).
ruleBase.addPackage( pkg );
final StatefulSession session = ruleBase.newStatefulSession();
Foo foo = new Foo();
foo.setName("Test");
Bar bar = new Bar();
bar.setFoo(foo);
session.insert(bar);
session.fireAllRules();
}
catch (Exception e)
{
System.out.println(e.getMessage());
e.printStackTrace();
fail(e.getMessage());
}
}
4:34 p.m.
Alessandro Lazarotti wrote:
Thanks Michael, I simulate.. your rule fire with successful.
I discovered the problem. The object in property (like Foo in your
example), when null, it's not throws NullPointerException, but
"org.mvel.PropertyAccessException: unable to resolve property".
With that, I never imagined that the problem was nullPointer, but I
thought about any access visibility (duh!).
[]'s
Alessandro
Glad it is working for you now, looks like I have to be more patient when
posting to this board as I seem to have junked the thread up a bit lol
Michael B. escreveu:
> Okay, I wrote a test case around the following and it works fine so let
> me
> know if this isnt what you are working with...
>
> Foo Class
>
> public class Foo {
>
> private String m_name;
>
> public String getName()
> {
> return m_name;
> }
>
> public void setName(String nm)
> {
> m_name = nm;
> }
>
> }
>
>
> Bar Class
>
> public class Bar {
>
> private Foo m_foo;
>
> public Foo getFoo()
> {
> return m_foo;
> }
>
> public void setFoo(Foo f)
> {
> m_foo = f;
> }
>
> public String toString()
> {
> return "I have a foo with a name of " + m_foo.getName();
> }
>
> }
>
> DRL Rule
>
> rule "FooBar Rule"
>
> when
> $bar : Bar( foo.name != "Wrong" )
> then
> System.out.println("Test Successful - " + $bar.toString());
>
> end
>
>
> Junit Test Case
>
> public void testProperties()
> {
> try
> {
> final Reader source = new InputStreamReader(
> FooBarTest.class.getResourceAsStream( "FooBar.drl" ) );
> RuleBase ruleBase = RuleBaseFactory.newRuleBase();
> PackageBuilder builder = new PackageBuilder();
>
> builder.addPackageFromDrl(source);
>
> if ( builder.hasErrors() ) {
> System.out.println( builder.getErrors().toString() );
> throw new RuntimeException( "Unable to compile
> \"FooBar.drl\".");
> }
>
> //get the compiled package (which is serializable)
> final Package pkg = builder.getPackage();
>
> //add the package to a rulebase (deploy the rule package).
> ruleBase.addPackage( pkg );
> final StatefulSession session =
> ruleBase.newStatefulSession();
>
> Foo foo = new Foo();
> foo.setName("Test");
> Bar bar = new Bar();
> bar.setFoo(foo);
> session.insert(bar);
>
> session.fireAllRules();
> }
> catch (Exception e)
> {
> System.out.println(e.getMessage());
> e.printStackTrace();
> fail(e.getMessage());
> }
>
> }
>
>
>
>
>
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8:19 p.m.
Really? That is a surprise to me... we need to handle that...
Maybe you can open a JIRA for us?
Thanks,
Edson
2008/5/6 Alessandro Lazarotti <alessandro(a)siq.com.br>:
Thanks Michael, I simulate.. your rule fire with successful.
I discovered the problem. The object in property (like Foo in your
example), when null, it's not throws NullPointerException, but
"org.mvel.PropertyAccessException: unable to resolve property".
With that, I never imagined that the problem was nullPointer, but I
thought about any access visibility (duh!).
[]'s
Alessandro
Michael B. escreveu:
Okay, I wrote a test case around the following and it works fine so let
> me
> know if this isnt what you are working with...
>
> Foo Class
>
> public class Foo {
> private String m_name;
> public String getName()
> {
> return m_name; }
> public void setName(String nm)
> {
> m_name = nm;
> }
>
> }
>
>
> Bar Class
>
> public class Bar {
> private Foo m_foo;
> public Foo getFoo()
> {
> return m_foo;
> }
> public void setFoo(Foo f)
> {
> m_foo = f;
> }
> public String toString()
> {
> return "I have a foo with a name of " + m_foo.getName();
> }
>
> }
>
> DRL Rule
>
> rule "FooBar Rule"
>
> when
> $bar : Bar( foo.name != "Wrong" )
> then System.out.println("Test Successful - " +
> $bar.toString());
>
> end
>
>
> Junit Test Case
>
> public void testProperties() {
> try
> {
> final Reader source = new InputStreamReader(
> FooBarTest.class.getResourceAsStream( "FooBar.drl" ) );
> RuleBase ruleBase = RuleBaseFactory.newRuleBase();
> PackageBuilder builder = new PackageBuilder();
> builder.addPackageFromDrl(source);
> if ( builder.hasErrors() ) {
> System.out.println( builder.getErrors().toString() );
> throw new RuntimeException( "Unable to compile
> \"FooBar.drl\".");
> }
> //get the compiled package (which is
> serializable)
> final Package pkg = builder.getPackage();
>
> //add the package to a rulebase (deploy the rule package).
> ruleBase.addPackage( pkg );
> final StatefulSession session =
> ruleBase.newStatefulSession();
> Foo foo = new Foo();
> foo.setName("Test");
> Bar bar = new Bar();
> bar.setFoo(foo);
> session.insert(bar);
> session.fireAllRules();
> }
> catch (Exception e)
> {
> System.out.println(e.getMessage());
> e.printStackTrace();
> fail(e.getMessage());
> }
>
> }
>
>
>
>
>
>
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--
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JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
9:50 p.m.
Verified this, in my example if I change the line to Bar.setFoo(null) I get
the following error in my test case:
Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@6bade9
org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@6bade9
at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:216)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:132)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
at org.drools.reteoo.Rete.assertObject(Rete.java:175)
at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:682)
at mmg.cm.drools.FooBarTest.testProperties(FooBarTest.java:51)
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:585)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.mvel.CompileException: unable to resolve property: name
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:288)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:109)
at
org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:29)
at
org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:77)
at
org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:26)
at
org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel.MVEL.executeExpression(MVEL.java:235)
at
org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:36)
at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:210)
... 28 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
name
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:382)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 38 more
Edson Tirelli-3 wrote:
Really? That is a surprise to me... we need to handle that...
Maybe you can open a JIRA for us?
Thanks,
Edson
2008/5/6 Alessandro Lazarotti <alessandro(a)siq.com.br>:
> Thanks Michael, I simulate.. your rule fire with successful.
>
> I discovered the problem. The object in property (like Foo in your
> example), when null, it's not throws NullPointerException, but
> "org.mvel.PropertyAccessException: unable to resolve property".
> With that, I never imagined that the problem was nullPointer, but I
> thought about any access visibility (duh!).
>
> []'s
> Alessandro
>
>
>
> Michael B. escreveu:
>
> Okay, I wrote a test case around the following and it works fine so let
> > me
> > know if this isnt what you are working with...
> >
> > Foo Class
> >
> > public class Foo {
> > private String m_name;
> > public String getName()
> > {
> > return m_name; }
> > public void setName(String nm)
> > {
> > m_name = nm;
> > }
> >
> > }
> >
> >
> > Bar Class
> >
> > public class Bar {
> > private Foo m_foo;
> > public Foo getFoo()
> > {
> > return m_foo;
> > }
> > public void setFoo(Foo f)
> > {
> > m_foo = f;
> > }
> > public String toString()
> > {
> > return "I have a foo with a name of " + m_foo.getName();
> > }
> >
> > }
> >
> > DRL Rule
> >
> > rule "FooBar Rule"
> >
> > when
> > $bar : Bar( foo.name != "Wrong" )
> > then System.out.println("Test Successful - " +
> > $bar.toString());
> >
> > end
> >
> >
> > Junit Test Case
> >
> > public void testProperties() {
> > try
> > {
> > final Reader source = new InputStreamReader(
> > FooBarTest.class.getResourceAsStream( "FooBar.drl" ) );
> > RuleBase ruleBase = RuleBaseFactory.newRuleBase();
> > PackageBuilder builder = new PackageBuilder();
> > builder.addPackageFromDrl(source);
> > if ( builder.hasErrors() ) {
> > System.out.println( builder.getErrors().toString() );
> > throw new RuntimeException( "Unable to compile
> > \"FooBar.drl\".");
> > }
> > //get the compiled package (which is
> > serializable)
> > final Package pkg = builder.getPackage();
> >
> > //add the package to a rulebase (deploy the rule package).
> > ruleBase.addPackage( pkg );
> > final StatefulSession session =
> > ruleBase.newStatefulSession();
> > Foo foo = new Foo();
> > foo.setName("Test");
> > Bar bar = new Bar();
> > bar.setFoo(foo);
> > session.insert(bar);
> > session.fireAllRules();
> > }
> > catch (Exception e)
> > {
> > System.out.println(e.getMessage());
> > e.printStackTrace();
> > fail(e.getMessage());
> > }
> >
> > }
> >
> >
> >
> >
> >
> >
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
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JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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5839
days inactive
5840
days old
9 comments
3 participants
participants (3)
-
Alessandro Lazarotti -
Edson Tirelli -
Michael B.