[rules-users] Using Java Rule Engine JSR-94

[Geoffrey De Smet]

The last release revision of JSR-94 was in 2004.
   http://www.jcp.org/en/jsr/detail?id=94

On 16-05-13 11:39, Stephen Masters wrote:
> JSR-94 is just an API, not an implementation. A bit like if you use JPA, you still need to have an implementation layer such as Hibernate, and DB-specific drivers underneath.
>
> The theoretical benefit is that you should be able to swap rule engine implementations such as Drools, JRules, or Blaze, without changing your API code.
>
> The reality is that most of these rules engines have a lot of functionality additional to the JSR-94 spec, and may not even be a particularly good fit to it. So using the JSR-94 API means that you need to accept a cut-down interface to the rules engine, which prevents you from accessing much of the functionality that you really need.
>
> To evaluate whether it's worth it, take a look at your code. What is the ratio of Drools API code to actual Drools DRL? I'm pretty sure that in any real-world application, re-writing the API code to an alternative platform is trivial in comparison to re-writing all of the rules code.
>
> Steve
>
>
> On 16 May 2013, at 10:09, abhinay_agarwal <abhinay_agarwal at infosys.com> wrote:
>
>> Hey,
>>
>> I read about JSR-94 and found it quite useful, so was trying to do a POC on
>> its usage. These are the steps which i followed.
>>
>> 1. Made a new java application.
>> 2. Added the JSR-94 api jars in its build path.
>> 3. Made a rule as myRuleFile.drl
>> 4. Wrote a RuleAdapter class as shown in drools expert document Chapter 5.
>> The Java Rule Engine
>> API (JSR94).
>>
>> But when i tried to run the piece of code, it kept giving me errors related
>> to Class missing related to drools.
>>
>> Are are the drools jar required to run this example,if yes, then what is the
>> avantage of using jsr-94 api ?
>>
>> If any specific jars, can you please list them out?
>>
>> If I am doing anything wrong, then, can you please point me to the correct
>> direction.
>>
>> Thanks,
>> Abhinay
>>
>>
>>
>> --
>> View this message in context: http://drools.46999.n3.nabble.com/Using-Java-Rule-Engine-JSR-94-tp4023852.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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>
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