Vaadin 8.12.1 and Java 11

Hello,

Even if Java 11 is not officially supported in Vaadin 8 it seems to work fine with tomcat 9. I have two issues which I would appreciate if anyone could provide some insights to.

  • gwt 2.8.2 and asm 5.03 does not support java 11, but still this does not cause any errors. Is it because I do not use any third party components?

  • I cannot get jetty 9.4.35 (nor jetty 11) to work with Vaadin 8 anymore. There are no errors, it only shows the WAR directory listing.

gwt 2.8.2 and asm 5.03 does not support java 11, but still this does not cause any errors. Is it because I do not use any third party components?

If you have custom widgets, I would recommend to isolate them in their own sub-module and set it to have source level 1.8 in its pom.xml.

I cannot get jetty 9.4.35 (nor jetty 11) to work with Vaadin 8 anymore.

I find it peculiar if Tomcat 9 works. Jetty 9.4.13+ should support Java 11 as they upgraded to Asm 7. But without more specific details it hard to say more about this.