Re: JESS: dealing with shadow facts having null properties
I can't reproduce anything like this; can you show me a stack trace (run jess.Main with -stacktrace to see a full error trace). On Aug 2, 2007, at 6:12 PM, Skeptic 2000 wrote: When I add a shadow fact with a property having a null value, I get an exception (in updateMultiSlot IRRC). JFL From: [EMAIL PROTECTED] Subject: Re: JESS: dealing with shadow facts having null properties Date: Thu, 2 Aug 2007 15:57:55 -0400 To: jess-users@sandia.gov Jess has been able to handle null properties for a long time; 6.1p8 can handle them, as can the current versions. What problem are you having, exactly? On Aug 2, 2007, at 2:19 PM, Skeptic 2000 wrote: Hi, I need to add in the working memory some shadow facts with properties whose values are null. Currently, my workaround is to use a NullObject to prevent Jess from crashing upon finding a null value. Is it the recommended way to do it ? JFL Soyez parmi les premiers à essayer Windows Live Mail. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://www.jessrules.com To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify owner-jess- [EMAIL PROTECTED] Soyez parmi les premiers à essayer Windows Live Mail. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://www.jessrules.com To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
RE: JESS: dealing with shadow facts having null properties
Hi and thanks a lot for helping, the details are here :
That's the ShadowFact :
public class Test {
private Integer a = null;
private Integer b = 4;
public Test() {
}
public int getA() {
return a;
}
public int getB() {
return b;
}
}
That's the .CLP file :
(defclass Test xxx.yyy.zzz.Test)
(defrule testrule
(Test (a ?a) (b ?b))
=
(printout t testrule ok)
)
That's the java code :
void functionX() {
...
jessEngine.add(new Test());
...
}
That's the exception :
Jess reported an error in routine DefinstanceList.updateMultipleSlots.
Message: Called method threw an exception.
at jess.DefinstanceList.getSlotValueFromObject(DefinstanceList.java:371)
at jess.DefinstanceList.setAllSlotValuesFromObject(DefinstanceList.java:353)
at jess.DefinstanceList.createNewShadowFact(DefinstanceList.java:332)
at jess.DefinstanceList.definstance(DefinstanceList.java:111)
at jess.Rete.definstance(Rete.java:1903)
at jess.Rete.definstance(Rete.java:1883)
at jess.Rete.add(Rete.java:2023)
...
JFL
From: [EMAIL PROTECTED] Subject: Re: JESS: dealing with shadow facts having
null properties Date: Fri, 3 Aug 2007 10:48:15 -0400 To:
jess-users@sandia.gov I can't reproduce anything like this; can you show
me a stack trace (run jess.Main with -stacktrace to see a full error
trace). On Aug 2, 2007, at 6:12 PM, Skeptic 2000 wrote:When I add
a shadow fact with a property having a null value, I get an exception (in
updateMultiSlot IRRC). JFLFrom: [EMAIL PROTECTED]
Subject: Re: JESS: dealing with shadow facts having null properties
Date: Thu, 2 Aug 2007 15:57:55 -0400 To: jess-users@sandia.gov
Jess has been able to handle null properties for a long time; 6.1p8 can
handle them, as can the current versions. What problem are you having,
exactly? On Aug 2, 2007, at 2:19 PM, Skeptic 2000 wrote:
Hi, I need to add in the working memory some shadow
facts withproperties whose values are null. Currently, my workaround
is touse a NullObject to prevent Jess from crashing upon finding a
null value. Is it the recommended way to do it ?
JFL Soyez parmi les premiers à essayer Windows Live
Mail. -
Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL
PROTECTED] Livermore, CA 94550 http://www.jessrules.com
To
unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use
your own address!) List problems? Notify owner-jess- [EMAIL PROTECTED]
Soyez parmi les premiers à essayer Windows Live Mail.
- Ernest
Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia
National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
To
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the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own
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_
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Re: JESS: dealing with shadow facts having null properties
Look closely at your stack trace: it says Message: Called method
threw an exception. If you called getCause() on the JessException,
it would return a NullPointerException, and if you looked at that
NPE's stack trace, you'd see it was thrown by the getA() method of
your Test class. Here are the relevant lines from your code:
private Integer a = null;
...
public int getA() {
return a;
}
Note that the type of variable a is Integer, but getA() is
returning an int. That means that, due to auto-unboxing, the Java
compiler is going to emit code as if you had written something like
public int getA() {
return a.intValue();
}
and since a is null, this line throws a NullPointerException. It's
not Jess's fault if your getter methods throw NPEs when called!
On Aug 3, 2007, at 2:51 PM, Skeptic 2000 wrote:
Hi and thanks a lot for helping, the details are here :
That's the ShadowFact :
public class Test {
private Integer a = null;
private Integer b = 4;
public Test() {
}
public int getA() {
return a;
}
public int getB() {
return b;
}
}
That's the .CLP file :
(defclass Test xxx.yyy.zzz.Test)
(defrule testrule
(Test (a ?a) (b ?b))
=
(printout t testrule ok)
)
That's the java code :
void functionX() {
...
jessEngine.add(new Test());
...
}
That's the exception :
Jess reported an error in routine DefinstanceList.updateMultipleSlots.
Message: Called method threw an exception.
at jess.DefinstanceList.getSlotValueFromObject(DefinstanceList.java:
371)
at jess.DefinstanceList.setAllSlotValuesFromObject
(DefinstanceList.java:353)
at jess.DefinstanceList.createNewShadowFact(DefinstanceList.java:332)
at jess.DefinstanceList.definstance(DefinstanceList.java:111)
at jess.Rete.definstance(Rete.java:1903)
at jess.Rete.definstance(Rete.java:1883)
at jess.Rete.add(Rete.java:2023)
...
JFL
From: [EMAIL PROTECTED]
Subject: Re: JESS: dealing with shadow facts having null properties
Date: Fri, 3 Aug 2007 10:48:15 -0400
To: jess-users@sandia.gov
I can't reproduce anything like this; can you show me a stack trace
(run jess.Main with -stacktrace to see a full error trace).
On Aug 2, 2007, at 6:12 PM, Skeptic 2000 wrote:
When I add a shadow fact with a property having a null value, I
get
an exception (in updateMultiSlot IRRC).
JFL
From: [EMAIL PROTECTED]
Subject: Re: JESS: dealing with shadow facts having null
properties
Date: Thu, 2 Aug 2007 15:57:55 -0400
To: jess-users@sandia.gov
Jess has been able to handle null properties for a long time;
6.1p8
can handle them, as can the current versions. What problem
are you
having, exactly?
On Aug 2, 2007, at 2:19 PM, Skeptic 2000 wrote:
Hi,
I need to add in the working memory some shadow facts with
properties whose values are null. Currently, my workaround
is to
use a NullObject to prevent Jess from crashing upon
finding a
null value.
Is it the recommended way to do it ?
JFL
Soyez parmi les premiers à essayer Windows Live Mail.
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
To unsubscribe, send the words 'unsubscribe jess-users
[EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the
list
(use your own address!) List problems? Notify owner-jess-
[EMAIL PROTECTED]
Soyez parmi les premiers à essayer Windows Live Mail.
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
To unsubscribe, send the words 'unsubscribe jess-users
[EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify owner-jess-
[EMAIL PROTECTED]
Soyez parmi les premiers à essayer Windows Live Mail.
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED
RE: JESS: dealing with shadow facts having null properties
Well, I'm really sorry...JFL
From: [EMAIL PROTECTED] Subject: Re: JESS: dealing with shadow facts having
null properties Date: Fri, 3 Aug 2007 15:23:03 -0400 To:
jess-users@sandia.gov Look closely at your stack trace: it says Message:
Called method threw an exception. If you called getCause() on the
JessException, it would return a NullPointerException, and if you looked at
that NPE's stack trace, you'd see it was thrown by the getA() method of
your Test class. Here are the relevant lines from your code: private
Integer a = null; ... public int getA() { return a; } Note that the
type of variable a is Integer, but getA() is returning an int. That means
that, due to auto-unboxing, the Java compiler is going to emit code as if
you had written something like public int getA() { return a.intValue();
} and since a is null, this line throws a NullPointerException. It's
not Jess's fault if your getter methods throw NPEs when called! On
Aug 3, 2007, at 2:51 PM, Skeptic 2000 wrote:Hi and thanks a lot for
helping, the details are here : That's the ShadowFact : public
class Test { private Integer a = null; private Integer b
= 4; public Test() { } public int
getA() { return a; } public int getB() {
return b; }} That's the .CLP file : (defclass
Test xxx.yyy.zzz.Test)(defrule testrule (Test (a ?a) (b ?b))
= (printout t testrule ok) ) That's the java code
: void functionX() { ... jessEngine.add(new Test()); ... }
That's the exception : Jess reported an error in routine
DefinstanceList.updateMultipleSlots. Message: Called method threw an
exception. at
jess.DefinstanceList.getSlotValueFromObject(DefinstanceList.java: 371)
at jess.DefinstanceList.setAllSlotValuesFromObject
(DefinstanceList.java:353) at
jess.DefinstanceList.createNewShadowFact(DefinstanceList.java:332) at
jess.DefinstanceList.definstance(DefinstanceList.java:111) at
jess.Rete.definstance(Rete.java:1903) at
jess.Rete.definstance(Rete.java:1883) at jess.Rete.add(Rete.java:2023)
...JFLFrom: [EMAIL PROTECTED] Subject:
Re: JESS: dealing with shadow facts having null properties Date: Fri, 3
Aug 2007 10:48:15 -0400 To: jess-users@sandia.gov I can't
reproduce anything like this; can you show me a stack trace (run
jess.Main with -stacktrace to see a full error trace). On Aug 2,
2007, at 6:12 PM, Skeptic 2000 wrote: When I add a shadow
fact with a property having a null value, I getan exception (in
updateMultiSlot IRRC). JFLFrom: [EMAIL
PROTECTED] Subject: Re: JESS: dealing with shadow facts having null
properties Date: Thu, 2 Aug 2007 15:57:55 -0400 To:
jess-users@sandia.gov Jess has been able to handle null
properties for a long time; 6.1p8 can handle them, as can the
current versions. What problem are you having, exactly?
On Aug 2, 2007, at 2:19 PM, Skeptic 2000 wrote:
Hi, I need to add in the working memory
some shadow facts with properties whose values are null.
Currently, my workaround is to use a NullObject to prevent
Jess from crashing upon finding a null value.
Is it the recommended way to do it ? JFL
Soyez parmi les premiers à essayer Windows Live Mail.
-
Ernest Friedman-Hill Advanced Software Research Phone: (925)
294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box
969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550
http://www.jessrules.com
To unsubscribe, send the words 'unsubscribe jess-users[EMAIL
PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to
the list (use your own address!) List problems? Notify
owner-jess-[EMAIL PROTECTED]
Soyez parmi les premiers à essayer Windows Live Mail.
-
Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL
PROTECTED] Livermore, CA 94550 http://www.jessrules.com
To
unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use
your own address!) List problems? Notify owner-jess- [EMAIL PROTECTED]
Soyez parmi les premiers à essayer Windows Live Mail.
- Ernest
Friedman
JESS: dealing with shadow facts having null properties
Hi, I need to add in the working memory some shadow facts with properties whose values are null. Currently, my workaround is to use a NullObject to prevent Jess from crashing upon finding a null value.Is it the recommended way to do it ?JFL _ Soyez parmi les premiers à essayer Windows Live Mail. http://ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e-4911fb2b2e6d
Re: JESS: dealing with shadow facts having null properties
Jess has been able to handle null properties for a long time; 6.1p8 can handle them, as can the current versions. What problem are you having, exactly? On Aug 2, 2007, at 2:19 PM, Skeptic 2000 wrote: Hi, I need to add in the working memory some shadow facts with properties whose values are null. Currently, my workaround is to use a NullObject to prevent Jess from crashing upon finding a null value. Is it the recommended way to do it ? JFL Soyez parmi les premiers à essayer Windows Live Mail. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://www.jessrules.com To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
RE: JESS: dealing with shadow facts having null properties
When I add a shadow fact with a property having a null value, I get an exception (in updateMultiSlot IRRC). JFL From: [EMAIL PROTECTED] Subject: Re: JESS: dealing with shadow facts having null properties Date: Thu, 2 Aug 2007 15:57:55 -0400 To: jess-users@sandia.gov Jess has been able to handle null properties for a long time; 6.1p8 can handle them, as can the current versions. What problem are you having, exactly? On Aug 2, 2007, at 2:19 PM, Skeptic 2000 wrote:Hi, I need to add in the working memory some shadow facts with properties whose values are null. Currently, my workaround is to use a NullObject to prevent Jess from crashing upon finding a null value. Is it the recommended way to do it ? JFL Soyez parmi les premiers à essayer Windows Live Mail. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://www.jessrules.com To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] _ Soyez parmi les premiers à essayer Windows Live Mail. http://ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e-4911fb2b2e6d
