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 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 7 51 ...

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.