I think that you can't. You should check the interfaces.. but I'm pretty sure that jbpm5.1 uses drools 5.2. You will have troubles with different interfaces and missing methods implementations.
Cheers

On Thu, Sep 8, 2011 at 6:06 PM, DroolersEye <sprabakkar@gmail.com> wrote:
can I use drools-5.1.1 jar fils with jbpm5.1 project. What I mean is can
replace the drools5.2 jars in the jbpm5.1 binary folder.

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with kind regards,

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