Can't use this on BungeeCord

[tomocrafter]

I am sorry for not following the template of Bug report.

I found why this error will occur in WebSocketServletFactory#Loader

// This code will occur error
Class<? extends WebSocketServletFactory> wsClazz = (Class<? extends WebSocketServletFactory>) Class.forName(DEFAULT_IMPL,true,Thread.currentThread().getContextClassLoader());

// This code won't error
Class<? extends WebSocketServletFactory> wsClazz = (Class<? extends WebSocketServletFactory>) Class.forName(DEFAULT_IMPL);

These two differences are whether Thread.currentThread().getContextClassLoader() does not walk.

[tomocrafter]

Duplicate of #232

[tipsy]

Thanks @tomocrafter. If you have a solution please submit a pull request.

[tomocrafter]

Finally, I found the solution to this problem.
Just replace class loader with default. I read BungeeCord source code on GitHub. and That replaces the class loader with customized. like

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(RemoteAPI.class.getClassLoader());
app = Javalin.create().start(PORT);
Thread.currentThread().setContextClassLoader(classLoader);

Thanks for supporting me. I close this issue.

[tipsy]

Thanks @tomocrafter !