Example source.

Hi! We are studying Drools 5.0 in order to use..
But a curious problem has happened, while executeing an example in documentation.

It is 3.1.3. Defining Processes Using the Process API in drools-5.0-docs\drools-flow\html_single\index.html.
Actually, 3.1.3.1. Example 1 is working normally, but 3.1.3.2. Example 2 and 3.1.3.3. Example 3 occur error.
I 'll tell you what we grasp the reason for error, so far.

When it's working normal, <ActionNode> exists.
The other way, when it is not working normal, <ActionNode> doesn't exist.
For example, in case of 3.1.3.2. Example 2

RuleFlowProcessFactory factory =
RuleFlowProcessFactory.createProcess("org.drools.HelloWorldJoinSplit");
factory
// Header
.name("HelloWorldJoinSplit")
.version("1.0")
.packageName("org.drools")
// Nodes
.startNode(1).name("Start").done()
.splitNode(2).name("Split").type(Split.TYPE_AND).done()
.actionNode(3).name("Action 1")
.action("mvel", "System.out.println(\"Inside Action 1\")").done() < -here, NullPointerException occurs.
.actionNode(4).name("Action 2")
.action("mvel", "System.out.println(\"Inside Action 2\")").done()
.joinNode(5).type(Join.TYPE_AND).done()
.endNode(6).name("End").done()
// Connections
.connection(1, 2)
.connection(2, 3)
.connection(2, 4)
.connection(3, 5)
.connection(4, 5)
.connection(5, 6);
RuleFlowProcess process = factory.validate().getProcess();

Please, let me know entire source I can execute this example well.

Thank you for your consideration.

I am waiting for you answer.