I experienced some problems too when I tried to import the examples for the first time.
I can't remember what I exactly did to solve them, but I end up deleting the project dependencies, and instead I put them(drools compiler, core, and other required plugins - listed in maven, but unfortunately didn't work for me as well)  as referenced libraries. Try to clean and re-build your project and it should work

----- Original Message ----
From: Marcin Krol <mrkafk@gmail.com>
To: rules-users@lists.jboss.org
Sent: Tuesday, August 19, 2008 8:52:56 PM
Subject: [rules-users] new user - running examples

Hello everyone,

I am totally new to Drools (I have basic exposure to Java, nothing
more), hope that someone helps me with the following problem:

I have successfully imported Eclipse plugin and ran the DroolTest.java
example in Eclipse Europa (it worked OK). Then I imported Eclipse
example (4.0.7) project into Eclipse workspace.


But most of .drl files show error markers with messages like:

    Rule 01:Unable to resolve ObjectType 'Cashflow'  (example4.drl)

Now when I try to run Example4.java, I get the error:

    The project: drools-compiler which is referenced by the classpath,
does not exist.


In Eclipse: menu Project | Properties | Java Build Path | Projects tab
shows drools-core and drools-compiler with yellow warning icons. Button
Edit is grayed out, there's nothing I can do to fix those items.

I have added drools-core-4.0.7.jar and drools-compiler-4.0.7.jar in Add
External JARs on Libraries tab, but this does nothing to resolve the
problem.

How do I fix those problems so I can run examples?

Regards,
Marcin


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