[rules-users] Difference between Rule Base and Knowledge Base

[Mark Proctor]

drools-flow is now called jBPM5 and is in it's own maven module. You'll 
need to have that on your classpath if you wish to use processes.

I would move to the new knowledge-api as soon as you can, because we 
will start to refactor classees in core and compiler after 5.4.

Mark
On 01/02/2012 20:36, womuji wrote:
> We are upgrading Drools Core from 5.1.1 to 5.3.1 and stilling using the old
> RuleBase API, but we got Null Pointer Exception when running rules:
> -----------------
> Caused by: [Error: wm.startProcess($phase.id): null]
> [Near : {... WorkingMemory wm = drools.getW ....}]
> ...
> Caused by: java.lang.NullPointerException
> 	at
> org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1073)
> -----------------
>
> where our DRL file has content:
> -----------------
> rule "Set ruleflow"
>      salience 10
>      when
>          $phase : Phase()
>      then
>          WorkingMemory wm = drools.getWorkingMemory();
>          wm.startProcess($phase.id);
> end
> -----------------
> Do we have to switch to KnlowledgeBase API or sth wrong with our rule? ( it
> worked fine with 5.1.1)
>
> --
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