B4J Question jrdc2 only recognizes versions up to 55

[Hamied Abou Hulaikah]

I'm try to using cassandra driver to connect, I got this error:

java.lang.UnsupportedClassVersionError: com/wisecoders/dbschema/cassandra/JdbcDriver has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 55.0

 

[jahswant]

Are you compiling with java 8?

 

[Hamied Abou Hulaikah]

It is not mine.
It is ready here.
Also this is source.

 

[Hamied Abou Hulaikah]

If you mean b4j compiling, i use jdk-11.0.1

 

[Chris2]

If you mean b4j compiling, i use jdk-11.0.1

Maybe you need to use a later version....

List of Java class file format major version numbers?

I saw this list of major version numbers for Java in another post: Java Major version 23 67 22 66 21 65 20 64 19 63 18 62 17 61 16 60 15 59 14 58 13 57 12 56 11 55 10 54 9 53 8 52...

stackoverflow.com

You can use any version you want or need to,

Update OpenJDK

I've been using OpenJDK 14 + OpenJFX 14 from Erels beta release post for a couple of years now for all my B4X projects, it works perfect. My wish is simply to hope that Anywhere Software updates to OpenJDK 18 + OpenJFX 18 sooner rather than later, especially as the B4A and B4J download pages...

www.b4x.com

 

[Hamied Abou Hulaikah]

Thank you for everyone

I googled & found something like this:

• ...
• 49 = Java 5
• 50 = Java 6
• 51 = Java 7
• 52 = Java 8
• 53 = Java 9
• 54 = Java 10
• 55 = Java 11
• 56 = Java 12
• 57 = Java 13
• ...

So, I solved it by downloading jdk 18 (latest up to today) & set it in B4J java path.
Cassandra now connected successfully.