We are currently in the middle of this migration process from 3.02 to 4.0.
We were impacted mainly because:
- some of our custom tag libraries were buggy but were working in 3.0
because tags were instantiated each time, starting from 3.1 tags can be
re-used so if you tag keep some state variables, it will impact next run.
- we had to completely review our configuration and installation doc due to
JRun switch from properties files to XML.
- some of our configuration have to be moved in other location due to new
war deployment.
- JNDI name space change.
Overall, this migration was more difficult because we skipped 3.1 but it
allowed us to improve our code quality and remove custom code.
Good luck,
Gael
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