Perhaps for the benefit of the community, u could share the knowledge and list down the actions taken, eg which jar files u missed/misspelled etc. Just that it's kinda weird that 'null pointer' exceptions is displayed if jar files not found. Expecting more like 'class not found' exception
-----Original Message----- From: Khairul Anwar [mailto:[EMAIL PROTECTED] Sent: Friday, April 14, 2006 12:27 PM To: user@drools.codehaus.org Subject: Re: [drools-user] NullPointerException using builder.addPackagerFromDrl(source) Hi, just got it solved. Never thought that the exception caused by a missing package name. Very frustrating mistake. Thank you very much Michael and Ishafizan. On 4/14/06, Ishafizan Ishak <[EMAIL PROTECTED]> wrote: > > Hi, > Can u try a simple helloWorld rule call (or a rule that u worked on and > works) ? Ie public final static String AUTH_RULE_FILE_LOGIN = > "myHelloWorld.drl"...then do a readRule(), plus could use the eclipse > debugger to see where it fails too. > > > > -----Original Message----- > From: Khairul Anwar [mailto:[EMAIL PROTECTED] > Sent: Friday, April 14, 2006 11:20 AM > To: user@drools.codehaus.org > Subject: Re: [drools-user] NullPointerException using > builder.addPackagerFromDrl(source) > > Here it is. Is it any possibilities the exception is caused by drl file? > If > any object used in drl file is null, the exception will be thrown at > workingMemory.assertObject() right? > > Sorry, a total newbie here. > > #list any import classes here. > import com.Session > import com.SystemConfig > import com.AuthorizationStateManager > > #declare any global variables here > > > rule "If user is in session" > salience -1 > #include attributes such as "salience" here... > when > #conditions > asm : AuthorizationStateManager() > Session(cntUserIdInSession>0) > then > #actions > asm.setUserIsInSession(true); > //drools.modifyObject(asm); > end > > > rule "Login: To allow access or not" > when > #conditions > asm : AuthorizationStateManager() > AuthorizationStateManager(userIsInSession==true) > then > #actions > asm.setAccessAllowedBool(false); > end > > > On 4/13/06, Michael Neale <[EMAIL PROTECTED]> wrote: > > > > Can you also post the rule(s) you are trying to run? > > > > On 4/13/06, Khairul Anwar <[EMAIL PROTECTED]> wrote: > > > > > > here is the code > > > > > > private static RuleBase ruleBase; > > > public final static String AUTH_RULE_FILE_LOGIN = " > > > ruleAuthorization.drl > > > "; > > > > > > RuleAuthorization() > > > { > > > WorkingMemory workingMemory = null; > > > if (ruleBase != null) { > > > System.out.println("rulebase not null : "+ > ruleBase.toString > > > ()); > > > workingMemory = ruleBase.newWorkingMemory(); > > > } else { > > > ruleBase = readRule(); > > > workingMemory = ruleBase.newWorkingMemory(); > > > } > > > > > > > > > workingMemory.assertObject(asm); > > > workingMemory.assertObject(ss.getCntUserIdInSession()); > > > workingMemory.assertObject(ss); > > > // fire rules > > > workingMemory.fireAllRules(); > > > > > > } > > > > > > > > > > > > private static RuleBase readRule() throws Exception { > > > // read in the source > > > System.out.println("Enter readRule"); > > > > > > Reader source = new InputStreamReader(RuleAuthorization.class > > > .getResourceAsStream(AUTH_RULE_FILE_LOGIN)); > > > > > > if (RuleAuthorization.class.getResourceAsStream > > > (AUTH_RULE_FILE_LOGIN) > > > != null) { > > > System.out.println("not null"); > > > } else { > > > System.out.println("null"); > > > } > > > > > > PackageBuilder builder = new PackageBuilder(); > > > try { > > > // builder.addPackage(pdscr); > > > builder.addPackageFromDrl(source); > > > } catch (Exception ex) { > > > // System.out.println("So the builder is : " + > > > // builder.getPackage()); > > > ex.printStackTrace(); > > > } > > > > > > > > > Package pkg = builder.getPackage(); > > > > > > // add the package to a rulebase (deploy the rule package). > > > ruleBase = RuleBaseFactory.newRuleBase(); > > > ruleBase.addPackage(pkg); > > > > > > return ruleBase; > > > } > > > > > > > > > exception : > > > 15:49:44,796 INFO [STDOUT] [mTokens]: line 1:1 > > > 15:49:44,796 INFO [STDOUT] state 0 (decision=15) no viable alt line > > 1:1; > > > char='?' > > > 15:49:44,796 INFO [STDOUT] [mTokens]: line 1:19 > > > 15:49:44,796 INFO [STDOUT] state 0 (decision=15) no viable alt line > > > 1:19; > > > char='?' > > > 15:49:44,796 INFO [STDOUT] java.lang.NullPointerException > > > 15:49:44,796 INFO [STDOUT] at > > > org.drools.compiler.PackageBuilder.newPackage(PackageBuilder.java:130) > > > 15:49:44,796 INFO [STDOUT] at > > > org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:115) > > > 15:49:44,796 INFO [STDOUT] at > > > org.drools.compiler.PackageBuilder.addPackageFromDrl( > PackageBuilder.java > > > :90) > > > 15:49:44,796 INFO [STDOUT] at RuleAuthorization.readRule( > > > RuleAuthorization.java:93) > > > > > > > > > On 4/13/06, Michael Neale <[EMAIL PROTECTED]> wrote: > > > > > > > > can you post some more details? > > > > > > > > On 4/13/06, Khairul Anwar <[EMAIL PROTECTED]> wrote: > > > > > > > > > > yes, it is RC1. > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > Khairul Anwar > > > > > > > > > > > > > -- > Khairul Anwar > > > -- Khairul Anwar
