Upgrade to Play 2.8 gone wrong

[afsilvasantos]

Hi.

I just upgraded a project form Play 2.7 to version 2.8. After some work changing method calls/interfaces that changed, I was able to compile and run tests, but now running the application I get the following error:

2023-02-08 17:07:10,928 [error] c.e.ErrorHandler - class java.util.HashMap cannot be cast to class java.util.Optional (java.util.HashMap and java.util.Optional are in module java.base of loader 'bootstrap')
java.lang.ClassCastException: class java.util.HashMap cannot be cast to class java.util.Optional (java.util.HashMap and java.util.Optional are in module java.base of loader 'bootstrap')
        at play.cache.DefaultSyncCacheApi.get(DefaultSyncCacheApi.java:38)
        at play.cache.SyncCacheApi.getOptional(SyncCacheApi.java:31)
        at org.pac4j.play.store.PlayCacheStore.internalGet(PlayCacheStore.java:49)
        at org.pac4j.core.store.AbstractStore.get(AbstractStore.java:25)
        at org.pac4j.play.store.PlayCacheSessionStore.get(PlayCacheSessionStore.java:95)
        at org.pac4j.play.store.PlayCacheSessionStore.get(PlayCacheSessionStore.java:26)
        at org.pac4j.core.matching.matcher.csrf.DefaultCsrfTokenGenerator.getTokenFromSession(DefaultCsrfTokenGenerator.java:32)
        at org.pac4j.core.matching.matcher.csrf.DefaultCsrfTokenGenerator.get(DefaultCsrfTokenGenerator.java:21)
        at org.pac4j.core.matching.matcher.csrf.CsrfTokenGeneratorMatcher.matches(CsrfTokenGeneratorMatcher.java:36)
        at org.pac4j.core.matching.checker.DefaultMatchingChecker.matches(DefaultMatchingChecker.java:102)

Whereas play.cache dependency is on version 2.8.17, org.pac4j.play is on version 2.13-10.0.2, and org.pac4j.core is on version 4.5.7. These versions match according to the compatibility table in https://github.com/pac4j/play-pac4j.

Has anyone got any problem like this before? I am using Play for the first time for 1 month now, so I don't fully understand everything of it yet.

The project is on Java 11 and runs on Scala, sbt version 1.6.2

[mkurz]

I recommend using sbt 1.7.2 (update that in project/build.properties).
For you problem not sure what's the problem. Run sbt clean and then try again.
You can also try the pac4j mailing list https://www.pac4j.org/mailing-lists.html

[HenningHeinz]

I am using a newer version of PAC4J.
The last version of Pac4J that worked for me was 5.4.5. Newer version cause trouble because slf4j was upgraded (and Play did not).
So my current (running) configuration is

• Play 2.8.19 (.17 should be fine too)
• Pac4J 5.4.5
• Pac4J-Play 11.1.0-PLAY2.8
• Java 11
• Scala 2.13.10
• sbt 1.6.2.

My projects are all Java based as I am too stupid for Scala.
Cheers

Henning

[mkurz]

You can also upgrade slf4j yourself when using Play 2.8, just add "ch.qos.logback" % "logback-classic" % "1.4.4" to your libraryDependencies, it will pull in slf4j 2.x as well (logback 1.4.x requires Java 11, so for logback 1.3 you need to use logback-classic 1.3.x)
Also here I recommend using sbt 1.7.2