5:31 a.m.
hi ,
i have a class called Event which is as follows:
public class Event {
private String name;
private File source;
private Date timeStamp;
public static List<Event> listOfEvents;
public Event(String name, File source, Date timeStamp) {
this.name = name;
this.source = source;
this.timeStamp = timeStamp;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public File getSource() {
return source;
}
public void setSource(File source) {
this.source = source;
}
public Date getTimeStamp() {
return timeStamp;
}
public void setTimeStamp(Date timeStamp) {
this.timeStamp = timeStamp;
}
public void display()
{
System.out.println(name +" " + "in folder: " + source + " on
" + timeStamp
);
}
there are also some other classes associated with my project.. i have a
rules file which computes the size of a folder and creates an object of
Event class. every time this object of Event class is created i wwant to
put it in a List<Event>.. how can i do this..
my rules is as follows:
rule "size"
when
$p: RuleContext($size: getOldContext().getParent().getUsableSpace() >
(30*1024*1024))
then
Event event = new Event("folder almost full",
$p.getOldContext().getParent(), new Date());
event.display();
......here i want to put this event into the List<Event> declared in
Event Class.....
end
thanks,
Sandhya
5:35 a.m.
Can you please elaborate about why do you want to do that? what's the point
of having a list inside of the Event class that will contain the same event?
The "Then" side of the rule is pure java.. so you just do
event.getEvents().add(event);
but I don't see the point of doing that.
Regards
On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
<sandhyachinnaraj(a)gmail.com>wrote:
hi ,
i have a class called Event which is as follows:
public class Event {
private String name;
private File source;
private Date timeStamp;
public static List<Event> listOfEvents;
public Event(String name, File source, Date timeStamp) {
this.name = name;
this.source = source;
this.timeStamp = timeStamp;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public File getSource() {
return source;
}
public void setSource(File source) {
this.source = source;
}
public Date getTimeStamp() {
return timeStamp;
}
public void setTimeStamp(Date timeStamp) {
this.timeStamp = timeStamp;
}
public void display()
{
System.out.println(name +" " + "in folder: " + source + " on
" +
timeStamp );
}
there are also some other classes associated with my project.. i have a
rules file which computes the size of a folder and creates an object of
Event class. every time this object of Event class is created i wwant to
put it in a List<Event>.. how can i do this..
my rules is as follows:
rule "size"
when
$p: RuleContext($size: getOldContext().getParent().getUsableSpace() >
(30*1024*1024))
then
Event event = new Event("folder almost full",
$p.getOldContext().getParent(), new Date());
event.display();
......here i want to put this event into the List<Event> declared in
Event Class.....
end
thanks,
Sandhya
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
5:41 a.m.
Actually, il have to use this List<Event> in another class and then print
list<Event> after every rule execution cycle.
On Mon, Mar 10, 2014 at 4:05 PM, Mauricio Salatino <salaboy(a)gmail.com>wrote:
Can you please elaborate about why do you want to do that? what's
the
point of having a list inside of the Event class that will contain the same
event?
The "Then" side of the rule is pure java.. so you just do
event.getEvents().add(event);
but I don't see the point of doing that.
Regards
On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree <sandhyachinnaraj(a)gmail.com
> wrote:
> hi ,
>
> i have a class called Event which is as follows:
>
> public class Event {
> private String name;
> private File source;
> private Date timeStamp;
> public static List<Event> listOfEvents;
>
> public Event(String name, File source, Date timeStamp) {
> this.name = name;
> this.source = source;
> this.timeStamp = timeStamp;
> }
> public String getName() {
> return name;
> }
> public void setName(String name) {
> this.name = name;
> }
> public File getSource() {
> return source;
> }
> public void setSource(File source) {
> this.source = source;
> }
> public Date getTimeStamp() {
> return timeStamp;
> }
> public void setTimeStamp(Date timeStamp) {
> this.timeStamp = timeStamp;
> }
>
>
> public void display()
> {
> System.out.println(name +" " + "in folder: " + source + "
on " +
> timeStamp );
> }
>
>
>
> there are also some other classes associated with my project.. i have a
> rules file which computes the size of a folder and creates an object of
> Event class. every time this object of Event class is created i wwant to
> put it in a List<Event>.. how can i do this..
>
> my rules is as follows:
>
> rule "size"
> when
> $p: RuleContext($size: getOldContext().getParent().getUsableSpace() >
> (30*1024*1024))
>
> then
> Event event = new Event("folder almost full",
> $p.getOldContext().getParent(), new Date());
> event.display();
> ......here i want to put this event into the List<Event> declared in
> Event Class.....
>
> end
>
>
>
> thanks,
> Sandhya
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
5:46 a.m.
Seeing that the list is static you can use the usual way for accessing
a static class member:
Event.listOfEvent.add( ... );
@Mauricio: It's not unusual to maintain a static collection (even
though there may be better ways, esp. with Drools).
On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
Can you please elaborate about why do you want to do that? what's
the point
of having a list inside of the Event class that will contain the same
event?
The "Then" side of the rule is pure java.. so you just do
event.getEvents().add(event);
but I don't see the point of doing that.
Regards
On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
<sandhyachinnaraj(a)gmail.com>wrote:
> hi ,
>
> i have a class called Event which is as follows:
>
> public class Event {
> private String name;
> private File source;
> private Date timeStamp;
> public static List<Event> listOfEvents;
>
> public Event(String name, File source, Date timeStamp) {
> this.name = name;
> this.source = source;
> this.timeStamp = timeStamp;
> }
> public String getName() {
> return name;
> }
> public void setName(String name) {
> this.name = name;
> }
> public File getSource() {
> return source;
> }
> public void setSource(File source) {
> this.source = source;
> }
> public Date getTimeStamp() {
> return timeStamp;
> }
> public void setTimeStamp(Date timeStamp) {
> this.timeStamp = timeStamp;
> }
>
>
> public void display()
> {
> System.out.println(name +" " + "in folder: " + source + "
on " +
> timeStamp );
> }
>
>
>
> there are also some other classes associated with my project.. i have a
> rules file which computes the size of a folder and creates an object of
> Event class. every time this object of Event class is created i wwant to
> put it in a List<Event>.. how can i do this..
>
> my rules is as follows:
>
> rule "size"
> when
> $p: RuleContext($size: getOldContext().getParent().getUsableSpace() >
> (30*1024*1024))
>
> then
> Event event = new Event("folder almost full",
> $p.getOldContext().getParent(), new Date());
> event.display();
> ......here i want to put this event into the List<Event> declared in
> Event Class.....
>
> end
>
>
>
> thanks,
> Sandhya
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
8:29 a.m.
im getting the following error on doing that
Exception in thread "pool-2-thread-1" Exception executing consequence for
rule "size" in com.net: java.lang.NullPointerException
what might be the problem?
On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
Seeing that the list is static you can use the usual way for
accessing
a static class member:
Event.listOfEvent.add( ... );
@Mauricio: It's not unusual to maintain a static collection (even
though there may be better ways, esp. with Drools).
On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
> Can you please elaborate about why do you want to do that? what's the
point
> of having a list inside of the Event class that will contain the same
> event?
>
> The "Then" side of the rule is pure java.. so you just do
> event.getEvents().add(event);
>
> but I don't see the point of doing that.
>
> Regards
>
>
> On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
> <sandhyachinnaraj(a)gmail.com>wrote:
>
>> hi ,
>>
>> i have a class called Event which is as follows:
>>
>> public class Event {
>> private String name;
>> private File source;
>> private Date timeStamp;
>> public static List<Event> listOfEvents;
>>
>> public Event(String name, File source, Date timeStamp) {
>> this.name = name;
>> this.source = source;
>> this.timeStamp = timeStamp;
>> }
>> public String getName() {
>> return name;
>> }
>> public void setName(String name) {
>> this.name = name;
>> }
>> public File getSource() {
>> return source;
>> }
>> public void setSource(File source) {
>> this.source = source;
>> }
>> public Date getTimeStamp() {
>> return timeStamp;
>> }
>> public void setTimeStamp(Date timeStamp) {
>> this.timeStamp = timeStamp;
>> }
>>
>>
>> public void display()
>> {
>> System.out.println(name +" " + "in folder: " + source +
" on " +
>> timeStamp );
>> }
>>
>>
>>
>> there are also some other classes associated with my project.. i have a
>> rules file which computes the size of a folder and creates an object of
>> Event class. every time this object of Event class is created i wwant to
>> put it in a List<Event>.. how can i do this..
>>
>> my rules is as follows:
>>
>> rule "size"
>> when
>> $p: RuleContext($size: getOldContext().getParent().getUsableSpace() >
>> (30*1024*1024))
>>
>> then
>> Event event = new Event("folder almost full",
>> $p.getOldContext().getParent(), new Date());
>> event.display();
>> ......here i want to put this event into the List<Event> declared in
>> Event Class.....
>>
>> end
>>
>>
>>
>> thanks,
>> Sandhya
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
> - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
> - Co-Founder @ http://www.jugargentina.org
> - Co-Founder @ http://www.jbug.com.ar
>
> - Salatino "Salaboy" Mauricio -
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
8:38 a.m.
Please copy the entire stack trace.. what you have copied doesn't mean
anything besides that there is something wrong.
On Mon, Mar 10, 2014 at 1:29 PM, Sandhya Sree <sandhyachinnaraj(a)gmail.com>wrote:
im getting the following error on doing that
Exception in thread "pool-2-thread-1" Exception executing consequence for
rule "size" in com.net: java.lang.NullPointerException
what might be the problem?
On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
> Seeing that the list is static you can use the usual way for accessing
> a static class member:
>
> Event.listOfEvent.add( ... );
>
> @Mauricio: It's not unusual to maintain a static collection (even
> though there may be better ways, esp. with Drools).
>
>
>
> On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
> > Can you please elaborate about why do you want to do that? what's the
> point
> > of having a list inside of the Event class that will contain the same
> > event?
> >
> > The "Then" side of the rule is pure java.. so you just do
> > event.getEvents().add(event);
> >
> > but I don't see the point of doing that.
> >
> > Regards
> >
> >
> > On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
> > <sandhyachinnaraj(a)gmail.com>wrote:
> >
> >> hi ,
> >>
> >> i have a class called Event which is as follows:
> >>
> >> public class Event {
> >> private String name;
> >> private File source;
> >> private Date timeStamp;
> >> public static List<Event> listOfEvents;
> >>
> >> public Event(String name, File source, Date timeStamp) {
> >> this.name = name;
> >> this.source = source;
> >> this.timeStamp = timeStamp;
> >> }
> >> public String getName() {
> >> return name;
> >> }
> >> public void setName(String name) {
> >> this.name = name;
> >> }
> >> public File getSource() {
> >> return source;
> >> }
> >> public void setSource(File source) {
> >> this.source = source;
> >> }
> >> public Date getTimeStamp() {
> >> return timeStamp;
> >> }
> >> public void setTimeStamp(Date timeStamp) {
> >> this.timeStamp = timeStamp;
> >> }
> >>
> >>
> >> public void display()
> >> {
> >> System.out.println(name +" " + "in folder: " + source +
" on " +
> >> timeStamp );
> >> }
> >>
> >>
> >>
> >> there are also some other classes associated with my project.. i have a
> >> rules file which computes the size of a folder and creates an object of
> >> Event class. every time this object of Event class is created i wwant
> to
> >> put it in a List<Event>.. how can i do this..
> >>
> >> my rules is as follows:
> >>
> >> rule "size"
> >> when
> >> $p: RuleContext($size: getOldContext().getParent().getUsableSpace()
> >
> >> (30*1024*1024))
> >>
> >> then
> >> Event event = new Event("folder almost full",
> >> $p.getOldContext().getParent(), new Date());
> >> event.display();
> >> ......here i want to put this event into the List<Event> declared
in
> >> Event Class.....
> >>
> >> end
> >>
> >>
> >>
> >> thanks,
> >> Sandhya
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users(a)lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> >
> >
> > --
> > - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
> > - Co-Founder @ http://www.jugargentina.org
> > - Co-Founder @ http://www.jbug.com.ar
> >
> > - Salatino "Salaboy" Mauricio -
> >
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
8:43 a.m.
Exception in thread "pool-2-thread-1" Exception executing consequence for
rule "size" in com.net: java.lang.NullPointerException
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at com.net.RuleExecutor.execute(RuleExecutor.java:18)
at com.net.DirectoryMonitor.run(DirectoryMonitor.java:39)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496.defaultConsequence(Rule_size_dc2a47e2812648e69eb9581eda931496.java:9)
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvoker.evaluate(Unknown
Source)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
On Mon, Mar 10, 2014 at 7:08 PM, Mauricio Salatino <salaboy(a)gmail.com>wrote:
Please copy the entire stack trace.. what you have copied doesn't
mean
anything besides that there is something wrong.
On Mon, Mar 10, 2014 at 1:29 PM, Sandhya Sree <sandhyachinnaraj(a)gmail.com>wrote:
> im getting the following error on doing that
>
> Exception in thread "pool-2-thread-1" Exception executing consequence for
> rule "size" in com.net: java.lang.NullPointerException
>
> what might be the problem?
>
>
>
> On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
>
>> Seeing that the list is static you can use the usual way for accessing
>> a static class member:
>>
>> Event.listOfEvent.add( ... );
>>
>> @Mauricio: It's not unusual to maintain a static collection (even
>> though there may be better ways, esp. with Drools).
>>
>>
>>
>> On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
>> > Can you please elaborate about why do you want to do that? what's the
>> point
>> > of having a list inside of the Event class that will contain the same
>> > event?
>> >
>> > The "Then" side of the rule is pure java.. so you just do
>> > event.getEvents().add(event);
>> >
>> > but I don't see the point of doing that.
>> >
>> > Regards
>> >
>> >
>> > On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
>> > <sandhyachinnaraj(a)gmail.com>wrote:
>> >
>> >> hi ,
>> >>
>> >> i have a class called Event which is as follows:
>> >>
>> >> public class Event {
>> >> private String name;
>> >> private File source;
>> >> private Date timeStamp;
>> >> public static List<Event> listOfEvents;
>> >>
>> >> public Event(String name, File source, Date timeStamp) {
>> >> this.name = name;
>> >> this.source = source;
>> >> this.timeStamp = timeStamp;
>> >> }
>> >> public String getName() {
>> >> return name;
>> >> }
>> >> public void setName(String name) {
>> >> this.name = name;
>> >> }
>> >> public File getSource() {
>> >> return source;
>> >> }
>> >> public void setSource(File source) {
>> >> this.source = source;
>> >> }
>> >> public Date getTimeStamp() {
>> >> return timeStamp;
>> >> }
>> >> public void setTimeStamp(Date timeStamp) {
>> >> this.timeStamp = timeStamp;
>> >> }
>> >>
>> >>
>> >> public void display()
>> >> {
>> >> System.out.println(name +" " + "in folder: " +
source + " on " +
>> >> timeStamp );
>> >> }
>> >>
>> >>
>> >>
>> >> there are also some other classes associated with my project.. i have
>> a
>> >> rules file which computes the size of a folder and creates an object
>> of
>> >> Event class. every time this object of Event class is created i wwant
>> to
>> >> put it in a List<Event>.. how can i do this..
>> >>
>> >> my rules is as follows:
>> >>
>> >> rule "size"
>> >> when
>> >> $p: RuleContext($size:
>> getOldContext().getParent().getUsableSpace() >
>> >> (30*1024*1024))
>> >>
>> >> then
>> >> Event event = new Event("folder almost full",
>> >> $p.getOldContext().getParent(), new Date());
>> >> event.display();
>> >> ......here i want to put this event into the List<Event>
declared
>> in
>> >> Event Class.....
>> >>
>> >> end
>> >>
>> >>
>> >>
>> >> thanks,
>> >> Sandhya
>> >>
>> >> _______________________________________________
>> >> rules-users mailing list
>> >> rules-users(a)lists.jboss.org
>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >>
>> >
>> >
>> >
>> > --
>> > - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
>> > - Co-Founder @ http://www.jugargentina.org
>> > - Co-Founder @ http://www.jbug.com.ar
>> >
>> > - Salatino "Salaboy" Mauricio -
>> >
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
8:48 a.m.
If the list inside Event has never being initialised it will throw a null
point exception.. so you need to make sure that the list
is initialised properly.
Regards
On Mon, Mar 10, 2014 at 1:43 PM, Sandhya Sree <sandhyachinnaraj(a)gmail.com>wrote:
Exception in thread "pool-2-thread-1" Exception executing
consequence for
rule "size" in com.net: java.lang.NullPointerException
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at com.net.RuleExecutor.execute(RuleExecutor.java:18)
at com.net.DirectoryMonitor.run(DirectoryMonitor.java:39)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496.defaultConsequence(Rule_size_dc2a47e2812648e69eb9581eda931496.java:9)
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvoker.evaluate(Unknown
Source)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
On Mon, Mar 10, 2014 at 7:08 PM, Mauricio Salatino <salaboy(a)gmail.com>wrote:
> Please copy the entire stack trace.. what you have copied doesn't mean
> anything besides that there is something wrong.
>
>
> On Mon, Mar 10, 2014 at 1:29 PM, Sandhya Sree <sandhyachinnaraj(a)gmail.com
> > wrote:
>
>> im getting the following error on doing that
>>
>> Exception in thread "pool-2-thread-1" Exception executing consequence
>> for rule "size" in com.net: java.lang.NullPointerException
>>
>> what might be the problem?
>>
>>
>>
>> On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun
<wolfgang.laun(a)gmail.com>wrote:
>>
>>> Seeing that the list is static you can use the usual way for accessing
>>> a static class member:
>>>
>>> Event.listOfEvent.add( ... );
>>>
>>> @Mauricio: It's not unusual to maintain a static collection (even
>>> though there may be better ways, esp. with Drools).
>>>
>>>
>>>
>>> On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
>>> > Can you please elaborate about why do you want to do that? what's
the
>>> point
>>> > of having a list inside of the Event class that will contain the same
>>> > event?
>>> >
>>> > The "Then" side of the rule is pure java.. so you just do
>>> > event.getEvents().add(event);
>>> >
>>> > but I don't see the point of doing that.
>>> >
>>> > Regards
>>> >
>>> >
>>> > On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
>>> > <sandhyachinnaraj(a)gmail.com>wrote:
>>> >
>>> >> hi ,
>>> >>
>>> >> i have a class called Event which is as follows:
>>> >>
>>> >> public class Event {
>>> >> private String name;
>>> >> private File source;
>>> >> private Date timeStamp;
>>> >> public static List<Event> listOfEvents;
>>> >>
>>> >> public Event(String name, File source, Date timeStamp) {
>>> >> this.name = name;
>>> >> this.source = source;
>>> >> this.timeStamp = timeStamp;
>>> >> }
>>> >> public String getName() {
>>> >> return name;
>>> >> }
>>> >> public void setName(String name) {
>>> >> this.name = name;
>>> >> }
>>> >> public File getSource() {
>>> >> return source;
>>> >> }
>>> >> public void setSource(File source) {
>>> >> this.source = source;
>>> >> }
>>> >> public Date getTimeStamp() {
>>> >> return timeStamp;
>>> >> }
>>> >> public void setTimeStamp(Date timeStamp) {
>>> >> this.timeStamp = timeStamp;
>>> >> }
>>> >>
>>> >>
>>> >> public void display()
>>> >> {
>>> >> System.out.println(name +" " + "in folder: " +
source + " on " +
>>> >> timeStamp );
>>> >> }
>>> >>
>>> >>
>>> >>
>>> >> there are also some other classes associated with my project.. i
>>> have a
>>> >> rules file which computes the size of a folder and creates an
object
>>> of
>>> >> Event class. every time this object of Event class is created i
>>> wwant to
>>> >> put it in a List<Event>.. how can i do this..
>>> >>
>>> >> my rules is as follows:
>>> >>
>>> >> rule "size"
>>> >> when
>>> >> $p: RuleContext($size:
>>> getOldContext().getParent().getUsableSpace() >
>>> >> (30*1024*1024))
>>> >>
>>> >> then
>>> >> Event event = new Event("folder almost full",
>>> >> $p.getOldContext().getParent(), new Date());
>>> >> event.display();
>>> >> ......here i want to put this event into the List<Event>
declared
>>> in
>>> >> Event Class.....
>>> >>
>>> >> end
>>> >>
>>> >>
>>> >>
>>> >> thanks,
>>> >> Sandhya
>>> >>
>>> >> _______________________________________________
>>> >> rules-users mailing list
>>> >> rules-users(a)lists.jboss.org
>>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>>> >>
>>> >
>>> >
>>> >
>>> > --
>>> > - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
>>> > - Co-Founder @ http://www.jugargentina.org
>>> > - Co-Founder @ http://www.jbug.com.ar
>>> >
>>> > - Salatino "Salaboy" Mauricio -
>>> >
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users(a)lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
> - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
> - Co-Founder @ http://www.jugargentina.org
> - Co-Founder @ http://www.jbug.com.ar
>
> - Salatino "Salaboy" Mauricio -
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
8:51 a.m.
Thanks :)
i got it :-)
On Mon, Mar 10, 2014 at 7:18 PM, Mauricio Salatino <salaboy(a)gmail.com>wrote:
If the list inside Event has never being initialised it will throw
a
null point exception.. so you need to make sure that the list
is initialised properly.
Regards
On Mon, Mar 10, 2014 at 1:43 PM, Sandhya Sree <sandhyachinnaraj(a)gmail.com>wrote:
> Exception in thread "pool-2-thread-1" Exception executing consequence for
> rule "size" in com.net: java.lang.NullPointerException
> at
>
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
> at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
> at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
> at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
> at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
> at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
> at
>
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
> at com.net.RuleExecutor.execute(RuleExecutor.java:18)
> at com.net.DirectoryMonitor.run(DirectoryMonitor.java:39)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> Caused by: java.lang.NullPointerException
> at
>
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496.defaultConsequence(Rule_size_dc2a47e2812648e69eb9581eda931496.java:9)
> at
>
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvokerGenerated.evaluate(Unknown
> Source)
> at
>
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvoker.evaluate(Unknown
> Source)
> at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
>
>
> On Mon, Mar 10, 2014 at 7:08 PM, Mauricio Salatino <salaboy(a)gmail.com>wrote:
>
>> Please copy the entire stack trace.. what you have copied doesn't mean
>> anything besides that there is something wrong.
>>
>>
>> On Mon, Mar 10, 2014 at 1:29 PM, Sandhya Sree <
>> sandhyachinnaraj(a)gmail.com> wrote:
>>
>>> im getting the following error on doing that
>>>
>>> Exception in thread "pool-2-thread-1" Exception executing
consequence
>>> for rule "size" in com.net: java.lang.NullPointerException
>>>
>>> what might be the problem?
>>>
>>>
>>>
>>> On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun <wolfgang.laun(a)gmail.com
>>> > wrote:
>>>
>>>> Seeing that the list is static you can use the usual way for accessing
>>>> a static class member:
>>>>
>>>> Event.listOfEvent.add( ... );
>>>>
>>>> @Mauricio: It's not unusual to maintain a static collection (even
>>>> though there may be better ways, esp. with Drools).
>>>>
>>>>
>>>>
>>>> On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
>>>> > Can you please elaborate about why do you want to do that?
what's
>>>> the point
>>>> > of having a list inside of the Event class that will contain the
same
>>>> > event?
>>>> >
>>>> > The "Then" side of the rule is pure java.. so you just do
>>>> > event.getEvents().add(event);
>>>> >
>>>> > but I don't see the point of doing that.
>>>> >
>>>> > Regards
>>>> >
>>>> >
>>>> > On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
>>>> > <sandhyachinnaraj(a)gmail.com>wrote:
>>>> >
>>>> >> hi ,
>>>> >>
>>>> >> i have a class called Event which is as follows:
>>>> >>
>>>> >> public class Event {
>>>> >> private String name;
>>>> >> private File source;
>>>> >> private Date timeStamp;
>>>> >> public static List<Event> listOfEvents;
>>>> >>
>>>> >> public Event(String name, File source, Date timeStamp) {
>>>> >> this.name = name;
>>>> >> this.source = source;
>>>> >> this.timeStamp = timeStamp;
>>>> >> }
>>>> >> public String getName() {
>>>> >> return name;
>>>> >> }
>>>> >> public void setName(String name) {
>>>> >> this.name = name;
>>>> >> }
>>>> >> public File getSource() {
>>>> >> return source;
>>>> >> }
>>>> >> public void setSource(File source) {
>>>> >> this.source = source;
>>>> >> }
>>>> >> public Date getTimeStamp() {
>>>> >> return timeStamp;
>>>> >> }
>>>> >> public void setTimeStamp(Date timeStamp) {
>>>> >> this.timeStamp = timeStamp;
>>>> >> }
>>>> >>
>>>> >>
>>>> >> public void display()
>>>> >> {
>>>> >> System.out.println(name +" " + "in folder:
" + source + " on " +
>>>> >> timeStamp );
>>>> >> }
>>>> >>
>>>> >>
>>>> >>
>>>> >> there are also some other classes associated with my project..
i
>>>> have a
>>>> >> rules file which computes the size of a folder and creates an
>>>> object of
>>>> >> Event class. every time this object of Event class is created i
>>>> wwant to
>>>> >> put it in a List<Event>.. how can i do this..
>>>> >>
>>>> >> my rules is as follows:
>>>> >>
>>>> >> rule "size"
>>>> >> when
>>>> >> $p: RuleContext($size:
>>>> getOldContext().getParent().getUsableSpace() >
>>>> >> (30*1024*1024))
>>>> >>
>>>> >> then
>>>> >> Event event = new Event("folder almost full",
>>>> >> $p.getOldContext().getParent(), new Date());
>>>> >> event.display();
>>>> >> ......here i want to put this event into the
List<Event>
>>>> declared in
>>>> >> Event Class.....
>>>> >>
>>>> >> end
>>>> >>
>>>> >>
>>>> >>
>>>> >> thanks,
>>>> >> Sandhya
>>>> >>
>>>> >> _______________________________________________
>>>> >> rules-users mailing list
>>>> >> rules-users(a)lists.jboss.org
>>>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>>>> >>
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > - MyJourney @ http://salaboy.com
<http://salaboy.wordpress.com>
>>>> > - Co-Founder @ http://www.jugargentina.org
>>>> > - Co-Founder @ http://www.jbug.com.ar
>>>> >
>>>> > - Salatino "Salaboy" Mauricio -
>>>> >
>>>> _______________________________________________
>>>> rules-users mailing list
>>>> rules-users(a)lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users(a)lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
>>
>>
>> --
>> - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
>> - Co-Founder @ http://www.jugargentina.org
>> - Co-Founder @ http://www.jbug.com.ar
>>
>> - Salatino "Salaboy" Mauricio -
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
- MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
- Co-Founder @ http://www.jugargentina.org
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
9:22 a.m.
Initializing references to objects is always a good idea to avoid NPE.
-W
On 10/03/2014, Sandhya Sree <sandhyachinnaraj(a)gmail.com> wrote:
im getting the following error on doing that
Exception in thread "pool-2-thread-1" Exception executing consequence for
rule "size" in com.net: java.lang.NullPointerException
what might be the problem?
On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun
<wolfgang.laun(a)gmail.com>wrote:
> Seeing that the list is static you can use the usual way for accessing
> a static class member:
>
> Event.listOfEvent.add( ... );
>
> @Mauricio: It's not unusual to maintain a static collection (even
> though there may be better ways, esp. with Drools).
>
>
>
> On 10/03/2014, Mauricio Salatino <salaboy(a)gmail.com> wrote:
> > Can you please elaborate about why do you want to do that? what's the
> point
> > of having a list inside of the Event class that will contain the same
> > event?
> >
> > The "Then" side of the rule is pure java.. so you just do
> > event.getEvents().add(event);
> >
> > but I don't see the point of doing that.
> >
> > Regards
> >
> >
> > On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
> > <sandhyachinnaraj(a)gmail.com>wrote:
> >
> >> hi ,
> >>
> >> i have a class called Event which is as follows:
> >>
> >> public class Event {
> >> private String name;
> >> private File source;
> >> private Date timeStamp;
> >> public static List<Event> listOfEvents;
> >>
> >> public Event(String name, File source, Date timeStamp) {
> >> this.name = name;
> >> this.source = source;
> >> this.timeStamp = timeStamp;
> >> }
> >> public String getName() {
> >> return name;
> >> }
> >> public void setName(String name) {
> >> this.name = name;
> >> }
> >> public File getSource() {
> >> return source;
> >> }
> >> public void setSource(File source) {
> >> this.source = source;
> >> }
> >> public Date getTimeStamp() {
> >> return timeStamp;
> >> }
> >> public void setTimeStamp(Date timeStamp) {
> >> this.timeStamp = timeStamp;
> >> }
> >>
> >>
> >> public void display()
> >> {
> >> System.out.println(name +" " + "in folder: " + source +
" on " +
> >> timeStamp );
> >> }
> >>
> >>
> >>
> >> there are also some other classes associated with my project.. i have
> >> a
> >> rules file which computes the size of a folder and creates an object
> >> of
> >> Event class. every time this object of Event class is created i wwant
> >> to
> >> put it in a List<Event>.. how can i do this..
> >>
> >> my rules is as follows:
> >>
> >> rule "size"
> >> when
> >> $p: RuleContext($size: getOldContext().getParent().getUsableSpace()
> >> >
> >> (30*1024*1024))
> >>
> >> then
> >> Event event = new Event("folder almost full",
> >> $p.getOldContext().getParent(), new Date());
> >> event.display();
> >> ......here i want to put this event into the List<Event> declared
> >> in
> >> Event Class.....
> >>
> >> end
> >>
> >>
> >>
> >> thanks,
> >> Sandhya
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users(a)lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> >
> >
> > --
> > - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
> > - Co-Founder @ http://www.jugargentina.org
> > - Co-Founder @ http://www.jbug.com.ar
> >
> > - Salatino "Salaboy" Mauricio -
> >
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
4409
days inactive
4409
days old
9 comments
3 participants
participants (3)
-
Mauricio Salatino -
Sandhya Sree -
Wolfgang Laun