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

[womuji]

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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