[jboss-jira] [JBoss JIRA] Resolved: (JBRULES-1466) please bail if user is using an incompatible MVEL

[Geoffrey De Smet (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-1466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Geoffrey De Smet resolved JBRULES-1466.
---------------------------------------

    Resolution: Rejected


This is not a good idea: if we hard code the expected MVEL version inside drools
  if (MVEL.VERSION != "2.0" && MVEL.VERSION_SUB = "17") {...}
then we create 2 problems:
- drools would crash if a higher, backward-compatible version of mvel is used, for example because another dependency (ZK) needs a more up-to-date mvel version.
- maintenance problem to keep that version in sync
Furthermore, following the same logic, we'd have to check in drools-compiler if a compatible drools-core version is used. And so on for all modules and all dependencies.


Instead, your build system should protect you from the "throw all jars in a lib directory" mess.
Use a build system that understand transitive dependencies, such as maven, ant+ivy, gradle, ...

> please bail if user is using an incompatible MVEL
> -------------------------------------------------
>
>                 Key: JBRULES-1466
>                 URL: https://issues.jboss.org/browse/JBRULES-1466
>             Project: Drools
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 4.0.4, 4.0.5
>            Reporter: Godmar Back
>            Assignee: Geoffrey De Smet
>             Fix For: 5.2.0.CR1
>
>
> When using MVEL, please check String constants org.mvel.MVEL.VERSION and org.mvel.MVEL.VERSION_SUB to see if it's compatible. Bail if it isn't.
> Ignoring version mismatches leads to difficult to diagnose problems, see:
> http://lists.jboss.org/pipermail/rules-users/2008-February/004759.html
> http://lists.jboss.org/pipermail/rules-users/2008-February/004709.html
> Thanks.

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