An illegal reflective access operation has occurred

[bursauxa]

Play Version

2.8.8

API

Scala

JDK

Java 11

Expected Behavior

Running a basic Play project should not issue any warning

Actual Behavior

The following warning is produced at start:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:<omitted>/com/google/inject/guice/4.2.3/guice-4.2.3.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

Additional information

This warning starts with Java 9, it was not present in Java 8. The root cause is an issue in Guice (google/guice#1133) that is fixed in Guice 5.0.1.

However, despite the dependencies file (https://github.com/playframework/playframework/blob/master/project/Dependencies.scala) listing guice 5.0.1 since February 27th, play-guice 2.8.8 released on April 8th still pulls guice 4.2.3, as evidenced by the dependency graph below:

com.typesafe.play:play-guice_2.13:2.8.8
    com.google.inject.extensions:guice-assistedinject:4.2.3
        com.google.inject:guice:4.2.3
    com.google.inject:guice:4.2.3
    com.typesafe.play:play_2.13:2.8.8

[mkurz]

This got fixed in the master branch already. You have to wait for Play 2.9.

[bursauxa]

Thanks @mkurz, I will be waiting then 🎉

[fancellu]

Still waiting, nearly 2 years later...

[claytonjacobs]

Still waiting. Blocker for updating to Java 11.

[claytonjacobs]

Still waiting. Blocker for updating to Java 11.

Adding this to libraryDependencies (and leaving in guice) in build.sbt got rid of the errors.

"com.google.inject" % "guice" % "5.1.0"

[mkurz]

Still waiting, nearly 2 years later...

Still waiting. Blocker for updating to Java 11.

Play 2.9 release candidate available now finally fixing this problem: https://github.com/playframework/playframework/releases/tag/2.9.0-RC2

[bursauxa]

Thanks @mkurz, I will be waiting then 🎉

The wait is finally over 😄