Tests fail on Java 11

[sideeffffect]

It seems like tests fail on Java 11.
Try adding adopt@1.11 to the .github/workflows/ci.yml matrix. Possibly even adopt@1.16 to test on the newest version of Java.

[info] - insert complete mail *** FAILED ***
[info]   ClassCastException: class com.sun.mail.handlers.text_plain cannot be cast to class javax.activation.DataContentHandler (com.sun.mail.handlers.text_plain is in unnamed module of loader sbt.internal.LayeredClassLoader @4d924b5f; javax.activation.DataContentHandler is in unnamed module of loader sbt.internal.LayeredClassLoader @795978fc)
[info]     javax.activation.MailcapCommandMap.getDataContentHandler(MailcapCommandMap.java:601)
[info]     javax.activation.MailcapCommandMap.createDataContentHandler(MailcapCommandMap.java:555)
[info]     javax.activation.DataHandler.getDataContentHandler(DataHandler.java:600)
[info]     javax.activation.DataHandler.writeTo(DataHandler.java:299)
[info]     javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:316)
[info]     javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1551)
[info]     javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1148)
[info]     javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:498)
[info]     javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1509)
[info]     javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1148)
[info]     javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:498)
[info]     javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1509)
[info]     javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2247)
[info]     javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2207)
[info]     emil.javamail.conv.BasicEncode.assemble$1(BasicEncode.scala:148)
[info]     emil.javamail.conv.BasicEncode.$anonfun$mailEncode$10(BasicEncode.scala:156)
[info]     map @ emil.javamail.conv.BasicEncode.$anonfun$bodyEncode$4(BasicEncode.scala:83)
[info]     flatMap @ emil.javamail.conv.BasicEncode.$anonfun$bodyEncode$1(BasicEncode.scala:82)
[info]     map @ emil.javamail.conv.BasicEncode.$anonfun$mailEncode$9(BasicEncode.scala:154)
[info]     map @ emil.javamail.conv.BasicEncode.$anonfun$mailEncode$9(BasicEncode.scala:154)
[info]     map @ fs2.internal.CompileScope.$anonfun$close$9(CompileScope.scala:246)
[info]     flatMap @ fs2.internal.CompileScope.$anonfun$close$6(CompileScope.scala:245)
[info]     map @ fs2.internal.CompileScope.fs2$internal$CompileScope$$traverseError(CompileScope.scala:222)
[info]     flatMap @ fs2.internal.CompileScope.$anonfun$close$4(CompileScope.scala:244)
[info]     map @ fs2.internal.CompileScope.fs2$internal$CompileScope$$traverseError(CompileScope.scala:222)
[info]     flatMap @ fs2.internal.CompileScope.$anonfun$close$2(CompileScope.scala:242)
[info]     flatMap @ fs2.internal.CompileScope.close(CompileScope.scala:241)
[info]     rethrow$extension @ fs2.Stream$Compiler$.$anonfun$compile$2(Stream.scala:4220)
[info]     flatMap @ fs2.internal.CompileScope.$anonfun$openAncestor$2(CompileScope.scala:261)
[info]     flatMap @ fs2.internal.FreeC$.$anonfun$compile$17(Algebra.scala:545)
[info]     map @ fs2.internal.CompileScope.$anonfun$close$9(CompileScope.scala:246)

[eikek]

That's interesting; can't reproduce it with openjdk11.

[sideeffffect]

Maybe if tried to re-run in?? Could you open a PR that adds Java 11 and 16 to the matrix?

[eikek]

Maybe if tried to re-run in??

Oops, correct! Running +test again without reloading sbt triggers this 😮

Could you open a PR that adds Java 11 and 16 to the matrix?

Yes, I'm going to have a deeper look on all of this later. Then I will add more jdks to the matrix.

[eikek]

A strange thing. Since upgrade to jakarta mail 2.0.1, I can't reproduce it on my machine. Travis ci is also fine. But on github actions, it is triggered for jdk11 and sometimes for jdk8.

[eikek]

Fixed by #188

Another try could be to use sbt's ClassLoaderLayeringStrategy.Flat for javamail tests.