[rules-users] Newbie question / NoSuchMethodError error

Edson Tirelli tirelli at post.com
Thu May 8 13:56:11 EDT 2008 

   Carl,

   Drools 4.0.x is indeed JDK 1.4+ compatible.

   Can you please share your complete stack trace?
   The snippet you showed:

Caused by: java.lang.NoSuchMethodError: java.lang.Integer.valueOf(I
)Ljava/lang/Integer;
   at AL_Calculation.Rule_ setSelecte_10_0.consequence(Unknown Source)

   Says that the problem is happening the consequence of a rule called
something like:

"setSelecte_10_0"

   Where _ is any non-valid character for classnames.

   That is not the rule you showed before.

   []s
   Edson


2008/5/8 Cabou, Carl <Carl.Cabou at prima-solutions.com>:

> So Does anybody know how I can make Drools 4 API works in JAVA1.4 ??
>
> Carl
>
> -----Message d'origine-----
> De : rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] De la part de Cabou, Carl
> Envoyé : jeudi 8 mai 2008 10:41
> À : Rules Users List
> Objet : RE: [rules-users] Newbie question / NoSuchMethodError error
>
> Thomas,
>
> I can not move the headings since I do receive "0 - 50" as a String and
> then I have to return an Integer.
>
> I've made a little program beside this to test my rule, I've launched it
> using java5, it worked fine, but it does crash using java1.4.
> I just found out the Integer.valueOf(int) is a new feature of java5.
>
> So I guess I must try to run my web application using java5.
>
> Carl.
>
> -----Message d'origine-----
> De : rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] De la part de Hehl, Thomas
> Envoyé : jeudi 8 mai 2008 10:20
> À : 'Rules Users List'
> Objet : RE: [rules-users] Newbie question / NoSuchMethodError error
>
> No, really, java uses the valueOf methods internally to try to convert the
> object specified (a String) into an Integer so it can do the comparison.
> You
> can't do selected == "0 - 50" because "0 - 50" is a String and you cant
> compare it to an Integer.
>
> So what are you trying to do? If you want selected to be in the range
> between 0 and 50 inclusive, then you need to change the heading in your
> decision table. Here's an example:
>
> daysBeforeSummons >= $1, daysBeforeSummons <= $2
>
> and then you specify the data in your column as 0,50.
>
> Good luck!
>
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Cabou, Carl
> Sent: Thursday, May 08, 2008 10:12 AM
> To: Rules Users List
> Subject: RE: [rules-users] Newbie question / NoSuchMethodError error
>
> Thank you for answering Thomas.
>
> Here is the code below, nothing fancy:
>
>
> public void setSelected (Integer calculatedSetSelected)
> {
>                this. calculatedSetSelected = calculatedSetSelected;
> }
>
> In fact, the problem IS that it is taking an Integer and some Drools
> Internal method want to convert it using Integer.valueOf, but there is no
> Integer.valueOf taking Integer.
>
> There is something weird, in the stack trace, I get :
>
> Caused by: java.lang.NoSuchMethodError:
> java.lang.Integer.valueOf(I)Ljava/lang/Integer;
>    at AL_Calculation.Rule_ setSelecte_10_0.consequence(Unknown Source)
>
> There is a missing "d" before "_10" ...
>
> Carl
>
>
> -----Message d'origine-----
> De : rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] De la part de Hehl, Thomas
> Envoyé : jeudi 8 mai 2008 09:35
> À : 'Rules Users List'
> Objet : RE: [rules-users] Newbie question / NoSuchMethodError error
>
> Yep. Post the code for setSelected(). I'm guessing it takes an Integer or
> int and you're passing it a String.
>
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Cabou, Carl
> Sent: Thursday, May 08, 2008 9:23 AM
> To: rules-users at lists.jboss.org
> Subject: [rules-users] Newbie question / NoSuchMethodError error
>
> Greetings,
>
> I'm new to Drools and I've written a decision table based rule using excel.
> The rule validates ok and I've deployed my package fine.
>
> I've written a piece of code to test my rules, I want to set the
> calculatedRate to 125 when I get selected field equal to "0 - 50" :
>
> ...
> StatelessSession statelessSession = rb.newStatelessSession(); Data data=new
> Data(); data.setSelected("0 - 50"); statelessSession.execute(data); // set
> private Integer field ...
>
> When I run the code I get a exeption :
>
> java.lang.NoSuchMethodError:
> java.lang.Integer.valueOf(I)Ljava/lang/Integer;
>
> I don't understand why Drools tries to convert to Integer something which
> is
> already Integer !!!!
>
> -----------
> Here is the rules code.
>
>
> rule "setCalculateRate_11"
>
>        salience 65525
>        when
>                Data(selected == "0 - 50")
>        then
>                object.setCalculatedRate(125);
> end
>
>
> --------------
> The CalculatedRate field is a java.lang.Integer object.
>
> Does anybody has an idea ??
>
> Regards,
> Carl.
>
>
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-- 
Edson Tirelli
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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