Java version problem with ckeditor 4.1.2

[netsrotr]

We try to compile our project, that use jdk 17.0.11 and make use of vaadin 24.5.7 with the ckeditor version 4.1.2 and did not get it started with the embedded tomcat:

java.lang.UnsupportedClassVersionError: com/wontlost/ckeditor/VaadinCKEditor has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
	at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
...

Our pom.xml is configured like this vaadin recommended in the upgrade guide:

<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>

With ckeditor 4.0.0 we did not encountered such a problem.

[jet-pang]

Please try to compile the upgrade branch (upgrade/vaadin_24.5.0-ckeditor_43.2.0), update pom as follows:

...
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
...
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.13.0</version>
    <configuration>
        <release>17</release>
    </configuration>
</plugin>
...

[netsrotr]

So why you specified

 <maven.compiler.release>21</maven.compiler.release>

in your mentioned branch?? We cannot use currently this java version because of other dependencies we have to use...

[jet-pang]

<maven.compiler.release> is recommended by Apache, I have published another version v4.1.2-8 for those who cannot use Java 21. Thanks.