This has nothing to do with Drools. It looks like you are giving Writer bad input perhaps??
Exception in thread "main" *java.lang.NullPointerException* at java.io.Writer.write(Unknown Source) at com.org.RulesTest.main(*RulesTest.java:58*) 2010/6/7 Fnu Mahalakshmi <fmahalaks...@nyx.com> > Hi, > > > > I am trying out this example from the book : > > public class Room { > > private String name > > // getter and setter methods here > > } > > public classs Sprinkler { > > private Room room; > > private boolean on; > > // getter and setter methods here > > } > > public class Fire { > > private Room room; > > // getter and setter methods here > > } > > > > I load 2 input files: 1. with data of fire and Room { f1, r1;f2, r2} > > 2. with data of sprinkler and Room { “ “, r1; “ > “ , r2} > > > > I am writing rule “ if fire exists in room start sprinkler” { so if f1 and > r1 in this case: I should get s1, r1 } > > when > > Fire($room : room) > > $sprinkler : Sprinkler( room == $room, modified == false ) > > Then > > $sprinkler.setmodified(true); > > modify( $sprinkler ) { setSprinkle( “s1” ) }; > > end > > > > But this gives me error: > > Exception in thread "main" *java.lang.NullPointerException* > > at java.io.Writer.write(Unknown Source) > > at com.org.RulesTest.main(*RulesTest.java:58*) > > > > From what I observed this rule is not getting fired at all. > > I want this rule to be fired on the data in my second input file. > > The rules for my first input file get executed properly. > > > > Can any1 tell me where I am going wrong?? > > Is there any way in which we can use the modified data { after rules are > fired on the first input data and it is modified}to fire another set of > rules on the same input depending on the next input file??? > > > > Thank you. > > > > -M > > ------------------------------ > > *Please consider the environment before printing this email.* > > *Visit our website at http://www.nyse.com > ***************************************************************************** > > Note: The information contained in this message and any attachment to it is > privileged, confidential and protected from disclosure. If the reader of > this message is not the intended recipient, or an employee or agent > responsible for delivering this message to the intended recipient, you are > hereby notified that any dissemination, distribution or copying of this > communication is strictly prohibited. If you have received this > communication in error, please notify the sender immediately by replying to > the message, and please delete it from your system. Thank you. NYSE > Euronext. * > > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > >
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