cannot inherit from final class..

[stianSjoli]

Hey,
I am suddenly getting this error while trying to follow some of your code in the higher level server API. Any new changes making it a problem?

Exception in thread "main" java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at akka.http.impl.settings.ParserSettingsImpl$.fromSubConfig(ParserSettingsImpl.scala:63)
at akka.http.impl.settings.ParserSettingsImpl$.fromSubConfig(ParserSettingsImpl.scala:53)
at akka.http.impl.util.SettingsCompanion.apply(SettingsCompanion.scala:44)
at akka.http.scaladsl.settings.ParserSettings$.apply(ParserSettings.scala:122)
at akka.http.scaladsl.settings.ParserSettings$.apply(ParserSettings.scala:95)
at akka.http.scaladsl.settings.SettingsCompanion$class.apply(SettingsCompanion.scala:16)
at akka.http.scaladsl.settings.ParserSettings$.apply(ParserSettings.scala:95)
at akka.http.scaladsl.settings.SettingsCompanion$class.default(SettingsCompanion.scala:17)
at akka.http.scaladsl.settings.ParserSettings$.default(ParserSettings.scala:95)
at HttpAkka$.run(HttpAkka.scala:39)
at CmdUI$.main(CmdUI.scala:12)

[ktoso]

Please include your config and akka version

[stianSjoli]

I think maybe I got it to work after all. I will remove the issue, and resubmit if I get it again..

[ktoso]

Sure, thanks. Please explain though what the issue was – in case someone bumps into the same thing 😉

[ryanskinner]

I hit this exact same issue. How was it resolved? @stianSjoli

[ktoso]

Most likely you're mixing versions of Akka – please make sure all dependencies are of the same version, i.e. 2.4.3

[stianSjoli]

yes, I believe I changed my dependencies - dependencies are all over the
place (some experimental etc. etc.)

On Wed, Apr 6, 2016 at 6:58 PM, Konrad Malawski notifications@github.com
wrote:

Most likely you're mixing versions of Akka – please make sure all
dependencies are of the same version, i.e. 2.4.3

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#20153 (comment)

[ktoso]

Please keep "the akka version" consistent though, you can't pick and choose "version X actor, but version Y cluster" – that may end up on weird things.

We do guarantee binary compatibility between versions (which libraries care about mostly), but please don't use werid mixes of versions :)

[ryanskinner]

I was able to figure it out as well and it was that I needed to move off of some of the "experimental" jars. Thanks all for the help.