Upgrade from 2.x to 3.x: No such var: encore/simple-date-format when compiling

[dkincaid]

Trying to upgrade from 2.x to 3.x. When I try to compile my project (with lein compile) I'm getting a compilation error:

Exception in thread "main" java.lang.RuntimeException: 
No such var: encore/simple-date-format, compiling:(taoensso/timbre.clj:278:27)

[ptaoussanis]

Hi Dave, thanks for getting in touch!

Just checked and [com.taoensso/timbre "3.1.2"] seems okay. It's possible you've got a dependency conflict.

Two things to try:

• lein deps :tree - you should have a [com.taoensso/encore "0.9.6"] dependency,
  or newer. If you don't (due to a conflict for example) - try add the dep directly to your project.clj.
• lein clean to clean out your Lein target dir (it can cause strange problems sometimes).

Please ping me again with your lein deps :tree output if those don't help and I'll try track down the problem.

Cheers! :-)

[dkincaid]

Thanks for the tip on lein deps :tree. That shows the problem:

Possibly confusing dependencies found:
[com.taoensso/faraday "1.2.0" :exclusions [org.apache.httpcomponents/httpclient org.apache.httpcomponents/httpcore]] -> [com.taoensso/encore "0.9.2"]
 overrides
[com.taoensso/timbre "3.1.2" :exclusions [junit]] -> [com.taoensso/encore "0.9.6"]

I put an exclusion into the faraday dependency for com.taoensso/encore and it's compiling now.

Thanks again.