[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-3047) The version of the JVM impacts which version of mvel*.jar should be included.

Wed May 28 00:00:49 EDT 2008

    [ http://jira.jboss.com/jira/browse/JBSEAM-3047?page=comments#action_12414505 ] 

Christopher Brock commented on JBSEAM-3047:
-------------------------------------------

Let's be clear though: each MVEL version does not have any forward-compat problems.

If you are using the 1.4 version, it will work FINE on 1.5 and 1.6.  And the 1.5 version will work FINE on 1.5 and 1.6, etc.  But there is no backwards compatibility from say, 1.5 to 1.4.

The differences are strictly performance/optimization related due both bytecode and JDK changes throughout the 3 java versions.  But there is no problem with forward compatibility.

> The version of the JVM impacts which version of mvel*.jar should be included.
> -----------------------------------------------------------------------------
>
>                 Key: JBSEAM-3047
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-3047
>             Project: Seam
>          Issue Type: Task
>    Affects Versions: 2.0.2.GA
>         Environment: Seam and Java 1.4, 1.5 or 1.6
>            Reporter: Earl Baugh
>            Priority: Minor
>
> As described on the MVEL web site, MVEL has some "compiler specific" issues.   You can experience some odd behavior without the correct mvel*.jar that matches the JVM you are utilizing.  The set up scripts should take this into consideration and/or the Seam  package should include something to tell the developer that a different version may be required based on the JVM selected. 
> See : http://mvel.codehaus.org/Downloading+MVEL  for the different versions.
> They also state: "... if you are deploying to a specific environment, it is recommended you choose the build which matches your JRE version_"

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