[play-scala-2.5.0] TypesafeConfig/SbtWeb Issue with Java 8 on Upgrade

[Neil Chaudhuri]

I have an existing Play 2.4.x app running on Java 8 that I am attempting to migrate to 2.5.0. When I make the changes to the build files, I get this exception in my IDE:

java.lang.UnsupportedClassVersionError: com/typesafe/config/ConfigException : Unsupported major.minor version 52.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:800)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

at java.net.URLClassLoader.access$100(URLClassLoader.java:71)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

at com.typesafe.sbt.web.SbtWeb$$anonfun$com$typesafe$sbt$web$SbtWeb$$load$1.apply(SbtWeb.scala:559)

...

It appears the SbtWeb class I currently have uses a version of TypesafeConfig that was compiled with an old Java version. How do I upgrade SbtWeb? I thought upgrading Play would do that, and I can't find anything in build.sbt or plugin.sbt that strikes me as obvious.

Thanks.

[p...@semlab.nl]

Did you try cleaning the project? Chances are there are bytecode compiled Java7 classes in the target folder that are reused.

Op zondag 20 maart 2016 18:24:44 UTC+1 schreef Neil Chaudhuri: