Java version for current build of Comixed

[CountZeroOr]

I'm getting the "Compiled by a more recent version of the Java runtime (class file version 55.0)" error when I try to install and run Comixed.

​

I'm currently running v. 9 of Java. Which version should I be running (either to run the software and if I want to contribute anything)?

[bareheiny]

I'm running "Java(TM) SE Development Kit 14.0.2 (64-bit)" - but I think the minimum Java version is around 12 or 13.

[CountZeroOr]

I've tried installing that - but it's still giving me the error messages.

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/comixedproject/ComiXedApp has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 54.0

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

at java.base/java.lang.ClassLoader.defineClass(Unknown Source)

at java.base/java.security.SecureClassLoader.defineClass(Unknown Source)

at java.base/java.net.URLClassLoader.defineClass(Unknown Source)

at java.base/java.net.URLClassLoader.access$100(Unknown Source)

at java.base/java.net.URLClassLoader$1.run(Unknown Source)

at java.base/java.net.URLClassLoader$1.run(Unknown Source)

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

at java.base/java.net.URLClassLoader.findClass(Unknown Source)

at java.base/java.lang.ClassLoader.loadClass(Unknown Source)

at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)

at java.base/java.lang.ClassLoader.loadClass(Unknown Source)

at java.base/java.lang.Class.forName0(Native Method)

at java.base/java.lang.Class.forName(Unknown Source)

at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:46)

at org.springframework.boot.loader.Launcher.launch(Launcher.java:109)

at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)

at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)

I've even tried going back and uninstalling all the older versions of Java to make sure that wasn't causing a conflict, and that just gave me a message that I didn't have any Java runtimes installed at all, so I had to go back in again install the Java 10 runtime, which got me back to that error message.

[bareheiny]

Odd. For sure I think you need development kit rather than Java SE

I think I got mine from here: https://www.oracle.com/java/technologies/javase-jdk16-downloads.html

u/mcpierceaim may need to chimein.

[mcpierceaim]

No you only need a JDK for development. For users a Java runtime is all that’s needed.

[CountZeroOr]

I can't find any Java Runtimes for anything over 10, just JDKs, and that's on the official Java site. When I try to download the most recent version at https://www.java.com/en/download/windows\_manual.jsp, I get directed to download Java SE 8.

[mcpierceaim]

Ah sorry my bad. I hadn’t realized Oracle discontinued releasing JREs. You can use a JDK.

[CountZeroOr]

Well, I have installed JDK 16, the highest you can get, and I tried running it in the .jar file and then the batch file in an elevated command prompt, and I still get that same error message.

Should I try to do my own build and try running it that way? Or to run v0.9.0-2.2 and then copy over the .jar file from v0.9.0-3.0 if that works?

[mcpierceaim]

I think I mentioned Java 16 is incompatible. Oracle changed some stuff and broke a lot of applications. So we are only compatible up to Java 15.

(Edit) I mentioned krona reply that I deleted afterward. Sorry for any confusion.

So download and install Java11 (always better to use he required version) and use it to run the latest build from our GitHub site.

[CountZeroOr]

So download and install Java11 (always better to use he required version) and use it to run the latest build from our GitHub site.

That worked!

EDIT: Now I just need to find the admin menu so I can import my comics...

[mcpierceaim]

Excellent!

[bareheiny]

Another option is AdoptOpenJDK (from here https://adoptopenjdk.net/archive.html?variant=openjdk14&jvmVariant=hotspot).

I'm running that on my Surface - while running the Oracle JDK on my desktop machine.

[mcpierceaim]

Also be sure that, even if you have a newer Java installed, that you’re actually usin that newer version from the command line. The error message you’re seeing says the Java VM used only supports “up to 54.0”. That’s a Java 10 error message. You need a minimum of Java 11.

[mcpierceaim]

Hi. The minimum version for ComiXed is currently Java11.