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@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@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@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
>>
>> _______________________________________________
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>> rules-users@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 -
>

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