UnsupportedClassVersionError on Robot Framework SwingLibrary: Unsupported major.minor version 51.0

[ndsulit]

I managed to launch the .jnlp application using Robot Framework with Remote Swing Library in which RemoteSwingLibrary 2.2.4 (which uses SwingLibrary 1.9.9 (supports Java version older than 8 as the .jnlp app uses Java SE 6). There's no problem with the application launch, everything works fine. But this internal error means SwingLibrary doesn't work with the .jnlp app.

Here's my environment:
OS:
Windows 10, 64-Bit

Java:
java version "1.8.0_271"
Java(TM) SE Runtime Environment (build 1.8.0_271-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.271-b09, mixed mode)

Robot Framework:
Robot Framework 3.2.2 (Python 3.7.9 on win32)

JNLP Application:
Java 6 SE

RemoteSwingLibrary:
RemoteSwingLibrary 1.9.9

[mihaiparvu]

Unfortunately RemoteSwingLibrary 2.2.4 is no longer supported. Please update your SUT to Java 8 and try with the latest version of remoteswinglibrary.

[Padmesh624]

Hi @ndsulit ,
I also need to automate jnlp application with Robot framework and RemoteSwingLibrary. But i not able to launch the application using start application keyword. Kindly help me to solve this problem.

I am using windows 11 machine.
Python version - 3.12.1
RemoteSwingLibrary-2.3.2
jnlp application java version - 1.8.351