9:14 a.m.
If I have a rule that has an error in it, the error isn't being caught by the
compiler and the error doesn't happen as the Object is inserted into the
session, it only happens after a time period completes, then Drools silently
fails.
How can I catch these silent failures.
See below for test case.
Notice in the After5 rule there is a mistake in the then part.
m.status=$m.status;
$m doesn't exist.
If i change this to $m.status=m.status, the compiler detects the error, but
this way of m.status=$m.status is not found.
When the rule fires it just dies.
I need to be able to catch the Exception somehow and report it..
Any help really appreciated..
Thanks
Ric
----------
sample.drl:-
----------
package com.sample
import com.sample.DroolsTest.Message;
declare Message
@role ( event )
end
rule "Hello"
dialect "mvel"
when
m : Message( status == Message.HELLO, myMessage : message )
then
System.out.println( "Hello added" );
end
rule "After5"
dialect "mvel"
when
m : Message( status == Message.HELLO, myMessage : message )
not( Message( status == Message.GOODBYE , this after [0s,5s] m ))
then
System.out.println( "After5 then start" );
m.status=$m.status;
System.out.println( "After5 then stop" );
retract(m);
end
----------
DroolsTest.java:
----------
package com.sample;
import org.drools.KnowledgeBase;
/**
* This is a sample class to launch a rule.
*/
public class DroolsTest {
public static final void main(String[] args) {
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase
.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory
.newFileLogger(ksession, "test");
// go !
Message message = new Message();
message.setMessage("Hello World");
message.setStatus(Message.HELLO);
System.out.println("Inserting message");
ksession.insert(message);
System.out.println("Fire all rules");
ksession.fireAllRules();
System.out.println("Sleep 10");
Thread.sleep(10000);
System.out.println("End sleep");
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBaseConfiguration conf = KnowledgeBaseFactory
.newKnowledgeBaseConfiguration();
conf.setOption(EventProcessingOption.STREAM); // STREAM mode as we are
// dealing with Events
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(conf);
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static class Message {
public static final int HELLO = 0;
public static final int GOODBYE = 1;
private String message;
private int status;
public String getMessage() {
return this.message;
}
public void setMessage(String message) {
this.message = message;
}
public int getStatus() {
return this.status;
}
public void setStatus(int status) {
this.status = status;
}
}
}
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9:42 a.m.
Take a look at this open jira:
https://issues.jboss.org/browse/JBRULES-2079
ruleBase.addPackage(packageBuilder.getPackage()); should fail-fast
with a clear error message if the packageBuilder has any errors
And take a look at PackageBuilder.hasErrors()
Op 05-09-12 15:14, RichardAmbridge schreef:
If I have a rule that has an error in it, the error isn't being
caught by the
compiler and the error doesn't happen as the Object is inserted into the
session, it only happens after a time period completes, then Drools silently
fails.
How can I catch these silent failures.
See below for test case.
Notice in the After5 rule there is a mistake in the then part.
m.status=$m.status;
$m doesn't exist.
If i change this to $m.status=m.status, the compiler detects the error, but
this way of m.status=$m.status is not found.
When the rule fires it just dies.
I need to be able to catch the Exception somehow and report it..
Any help really appreciated..
Thanks
Ric
----------
sample.drl:-
----------
package com.sample
import com.sample.DroolsTest.Message;
declare Message
@role ( event )
end
rule "Hello"
dialect "mvel"
when
m : Message( status == Message.HELLO, myMessage : message )
then
System.out.println( "Hello added" );
end
rule "After5"
dialect "mvel"
when
m : Message( status == Message.HELLO, myMessage : message )
not( Message( status == Message.GOODBYE , this after [0s,5s] m ))
then
System.out.println( "After5 then start" );
m.status=$m.status;
System.out.println( "After5 then stop" );
retract(m);
end
----------
DroolsTest.java:
----------
package com.sample;
import org.drools.KnowledgeBase;
/**
* This is a sample class to launch a rule.
*/
public class DroolsTest {
public static final void main(String[] args) {
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase
.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory
.newFileLogger(ksession, "test");
// go !
Message message = new Message();
message.setMessage("Hello World");
message.setStatus(Message.HELLO);
System.out.println("Inserting message");
ksession.insert(message);
System.out.println("Fire all rules");
ksession.fireAllRules();
System.out.println("Sleep 10");
Thread.sleep(10000);
System.out.println("End sleep");
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBaseConfiguration conf = KnowledgeBaseFactory
.newKnowledgeBaseConfiguration();
conf.setOption(EventProcessingOption.STREAM); // STREAM mode as we are
// dealing with Events
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(conf);
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static class Message {
public static final int HELLO = 0;
public static final int GOODBYE = 1;
private String message;
private int status;
public String getMessage() {
return this.message;
}
public void setMessage(String message) {
this.message = message;
}
public int getStatus() {
return this.status;
}
public void setStatus(int status) {
this.status = status;
}
}
}
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9:46 a.m.
@Geoffrey: But Richard's code does check for errors and aborts by
throwing an Exception.
And it works - see my other email.
-W
On 05/09/2012, Geoffrey De Smet <ge0ffrey.spam(a)gmail.com> wrote:
Take a look at this open jira:
https://issues.jboss.org/browse/JBRULES-2079
ruleBase.addPackage(packageBuilder.getPackage()); should fail-fast
with a clear error message if the packageBuilder has any errors
And take a look at PackageBuilder.hasErrors()
Op 05-09-12 15:14, RichardAmbridge schreef:
> If I have a rule that has an error in it, the error isn't being caught by
> the
> compiler and the error doesn't happen as the Object is inserted into the
> session, it only happens after a time period completes, then Drools
> silently
> fails.
> How can I catch these silent failures.
>
> See below for test case.
>
> Notice in the After5 rule there is a mistake in the then part.
> m.status=$m.status;
>
> $m doesn't exist.
>
> If i change this to $m.status=m.status, the compiler detects the error,
> but
> this way of m.status=$m.status is not found.
>
> When the rule fires it just dies.
> I need to be able to catch the Exception somehow and report it..
>
> Any help really appreciated..
> Thanks
> Ric
>
>
> ----------
> sample.drl:-
> ----------
>
> package com.sample
>
> import com.sample.DroolsTest.Message;
>
> declare Message
> @role ( event )
> end
> rule "Hello"
> dialect "mvel"
>
> when
> m : Message( status == Message.HELLO, myMessage : message )
>
> then
> System.out.println( "Hello added" );
> end
>
> rule "After5"
> dialect "mvel"
>
> when
> m : Message( status == Message.HELLO, myMessage : message )
> not( Message( status == Message.GOODBYE , this after [0s,5s] m ))
>
> then
> System.out.println( "After5 then start" );
> m.status=$m.status;
> System.out.println( "After5 then stop" );
> retract(m);
> end
>
> ----------
> DroolsTest.java:
> ----------
> package com.sample;
>
> import org.drools.KnowledgeBase;
>
> /**
> * This is a sample class to launch a rule.
> */
> public class DroolsTest {
>
> public static final void main(String[] args) {
> try {
> // load up the knowledge base
> KnowledgeBase kbase = readKnowledgeBase();
> StatefulKnowledgeSession ksession = kbase
> .newStatefulKnowledgeSession();
> KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory
> .newFileLogger(ksession, "test");
> // go !
> Message message = new Message();
> message.setMessage("Hello World");
> message.setStatus(Message.HELLO);
> System.out.println("Inserting message");
> ksession.insert(message);
> System.out.println("Fire all rules");
> ksession.fireAllRules();
> System.out.println("Sleep 10");
> Thread.sleep(10000);
> System.out.println("End sleep");
> logger.close();
> } catch (Throwable t) {
> t.printStackTrace();
> }
> }
>
> private static KnowledgeBase readKnowledgeBase() throws Exception {
> KnowledgeBaseConfiguration conf = KnowledgeBaseFactory
> .newKnowledgeBaseConfiguration();
> conf.setOption(EventProcessingOption.STREAM); // STREAM mode as we are
> // dealing with Events
>
> KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
> .newKnowledgeBuilder();
> kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
> ResourceType.DRL);
> KnowledgeBuilderErrors errors = kbuilder.getErrors();
> if (errors.size() > 0) {
> for (KnowledgeBuilderError error : errors) {
> System.err.println(error);
> }
> throw new IllegalArgumentException("Could not parse knowledge.");
> }
> KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(conf);
> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
> return kbase;
> }
>
> public static class Message {
>
> public static final int HELLO = 0;
> public static final int GOODBYE = 1;
>
> private String message;
>
> private int status;
>
> public String getMessage() {
> return this.message;
> }
>
> public void setMessage(String message) {
> this.message = message;
> }
>
> public int getStatus() {
> return this.status;
> }
>
> public void setStatus(int status) {
> this.status = status;
> }
>
> }
>
> }
>
>
>
> --
> View this message in context:
>
http://drools.46999.n3.nabble.com/Drools-fusion-how-to-I-catch-an-Excepti...
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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9:44 a.m.
Works for me, i.e., the DRL compiler flags an error.
Checked with 5.2.0, 5.3.0, 5.4.0.
-W
On 05/09/2012, RichardAmbridge <richard.ambridge(a)gmail.com> wrote:
If I have a rule that has an error in it, the error isn't being
caught by
the
compiler and the error doesn't happen as the Object is inserted into the
session, it only happens after a time period completes, then Drools
silently
fails.
How can I catch these silent failures.
See below for test case.
Notice in the After5 rule there is a mistake in the then part.
m.status=$m.status;
$m doesn't exist.
If i change this to $m.status=m.status, the compiler detects the error, but
this way of m.status=$m.status is not found.
When the rule fires it just dies.
I need to be able to catch the Exception somehow and report it..
Any help really appreciated..
Thanks
Ric
----------
sample.drl:-
----------
package com.sample
import com.sample.DroolsTest.Message;
declare Message
@role ( event )
end
rule "Hello"
dialect "mvel"
when
m : Message( status == Message.HELLO, myMessage : message )
then
System.out.println( "Hello added" );
end
rule "After5"
dialect "mvel"
when
m : Message( status == Message.HELLO, myMessage : message )
not( Message( status == Message.GOODBYE , this after [0s,5s] m ))
then
System.out.println( "After5 then start" );
m.status=$m.status;
System.out.println( "After5 then stop" );
retract(m);
end
----------
DroolsTest.java:
----------
package com.sample;
import org.drools.KnowledgeBase;
/**
* This is a sample class to launch a rule.
*/
public class DroolsTest {
public static final void main(String[] args) {
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase
.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory
.newFileLogger(ksession, "test");
// go !
Message message = new Message();
message.setMessage("Hello World");
message.setStatus(Message.HELLO);
System.out.println("Inserting message");
ksession.insert(message);
System.out.println("Fire all rules");
ksession.fireAllRules();
System.out.println("Sleep 10");
Thread.sleep(10000);
System.out.println("End sleep");
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBaseConfiguration conf = KnowledgeBaseFactory
.newKnowledgeBaseConfiguration();
conf.setOption(EventProcessingOption.STREAM); // STREAM mode as we are
// dealing with Events
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(conf);
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static class Message {
public static final int HELLO = 0;
public static final int GOODBYE = 1;
private String message;
private int status;
public String getMessage() {
return this.message;
}
public void setMessage(String message) {
this.message = message;
}
public int getStatus() {
return this.status;
}
public void setStatus(int status) {
this.status = status;
}
}
}
--
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9:48 a.m.
What is flagging an error for you?
Eclipse plugin shows error, but it compiles.
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
*KnowledgeBuilderErrors errors = kbuilder.getErrors();*
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
The getErrors() doesn't return any errors.
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9:52 a.m.
This is what I get on standard output when I run your code with 5.4.0
(only renamed the main class and the package):
Unable to Analyse Expression System.out.println( "After5 then start" );
m.status=$m.status;
System.out.println( "After5 then stop" );
drools.retract(m);:
[Error: unable to resolve method using strict-mode:
org.drools.spi.KnowledgeHelper.$m()]
[Near : {... m.status=$m.status; ....}]
^
[Line: 19, Column: 0] : [Rule name='After5']
java.lang.IllegalArgumentException: Could not parse knowledge.
at baddrl.Main.readKnowledgeBase(Main.java:66)
at baddrl.Main.main(Main.java:29)
On 05/09/2012, RichardAmbridge <richard.ambridge(a)gmail.com> wrote:
What is flagging an error for you?
Eclipse plugin shows error, but it compiles.
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
*KnowledgeBuilderErrors errors = kbuilder.getErrors();*
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
The getErrors() doesn't return any errors.
--
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9:53 a.m.
Perhaps do a "clean project"?
On 05/09/2012, RichardAmbridge <richard.ambridge(a)gmail.com> wrote:
What is flagging an error for you?
Eclipse plugin shows error, but it compiles.
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
*KnowledgeBuilderErrors errors = kbuilder.getErrors();*
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
The getErrors() doesn't return any errors.
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10:08 a.m.
I have tried with 5.3.0 and 5.4.0, each time I run it the getErrors is blank
(and hasErrors() is false)
So the compile is always passing for me.
However, when I run it under 5.4.0 (was using 5.3.0) I now get in the
output:
Inserting message
Fire all rules
Hello added
Sleep 10
After5 then start
Unable to execute timer job!
Exception executing consequence for rule "After5" in com.sample: [Error:
unable to resolve method: org.drools.base.DefaultKnowledgeHelper.$m()
[arglength=0]]
[Near : {... System.out.println( "After5 th ....}]
^
[Line: 1, Column: 1]
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at
org.drools.common.DefaultAgenda.fireTimedActivation(DefaultAgenda.java:1330)
.....etc...
So in 5.4.0 the exception is caught someplace inside drools and printed to
the output.
My question still remains, how can I get notified in my code that an
exception has happened?
Thanks for the replies,
Ric
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11:01 a.m.
There's another thing I changed which might have an impact: I changed
Message to be a class on its own Message.java file. It's possible that MVEL
is
confused by that and runs into a bug.
Try this, please.
-W
On 5 September 2012 16:08, RichardAmbridge <richard.ambridge(a)gmail.com>wrote:
I have tried with 5.3.0 and 5.4.0, each time I run it the getErrors
is
blank
(and hasErrors() is false)
So the compile is always passing for me.
However, when I run it under 5.4.0 (was using 5.3.0) I now get in the
output:
Inserting message
Fire all rules
Hello added
Sleep 10
After5 then start
Unable to execute timer job!
Exception executing consequence for rule "After5" in com.sample: [Error:
unable to resolve method: org.drools.base.DefaultKnowledgeHelper.$m()
[arglength=0]]
[Near : {... System.out.println( "After5 th ....}]
^
[Line: 1, Column: 1]
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at
org.drools.common.DefaultAgenda.fireTimedActivation(DefaultAgenda.java:1330)
.....etc...
So in 5.4.0 the exception is caught someplace inside drools and printed to
the output.
My question still remains, how can I get notified in my code that an
exception has happened?
Thanks for the replies,
Ric
--
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11:11 a.m.
OK, using exactly the same static class Message - I get an error returned
from the builder.
Only thing I can think of is some error in the Eclipse setup, Drools
runtime, classpath,...
I compile and run such small samples from a Linux shell command line, so I
avoid all such possible problems.
-W
On 5 September 2012 17:01, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
There's another thing I changed which might have an impact: I
changed
Message to be a class on its own Message.java file. It's possible that
MVEL is
confused by that and runs into a bug.
Try this, please.
-W
On 5 September 2012 16:08, RichardAmbridge <richard.ambridge(a)gmail.com>wrote:
> I have tried with 5.3.0 and 5.4.0, each time I run it the getErrors is
> blank
> (and hasErrors() is false)
>
> So the compile is always passing for me.
>
>
> However, when I run it under 5.4.0 (was using 5.3.0) I now get in the
> output:
> Inserting message
> Fire all rules
> Hello added
> Sleep 10
> After5 then start
> Unable to execute timer job!
> Exception executing consequence for rule "After5" in com.sample: [Error:
> unable to resolve method: org.drools.base.DefaultKnowledgeHelper.$m()
> [arglength=0]]
> [Near : {... System.out.println( "After5 th ....}]
> ^
> [Line: 1, Column: 1]
> at
>
>
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
> at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
> at
>
> org.drools.common.DefaultAgenda.fireTimedActivation(DefaultAgenda.java:1330)
> .....etc...
>
>
> So in 5.4.0 the exception is caught someplace inside drools and printed to
> the output.
>
> My question still remains, how can I get notified in my code that an
> exception has happened?
>
> Thanks for the replies,
> Ric
>
>
>
>
> --
> View this message in context:
>
http://drools.46999.n3.nabble.com/Drools-fusion-how-to-I-catch-an-Excepti...
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
4249
days inactive
4249
days old
9 comments
3 participants
participants (3)
-
Geoffrey De Smet -
RichardAmbridge -
Wolfgang Laun