public class KeyLoaderListener implements ServletContextListener {
   private ServletContext context = null;
   private Dotenv dotenv;

   public KeyLoaderListener() {
      this.dotenv = Dotenv.load();   // Line 30 where error occurs
   }
   ...
}

java.lang.NoSuchMethodError: java.lang.String.isBlank()Z
at io.github.cdimascio.dotenv.internal.DotenvParser.parse(DotenvParser.java:33)
at io.github.cdimascio.dotenv.DotenvBuilder.load(DotenvBuilder.java:81)
at io.github.cdimascio.dotenv.Dotenv.load(Dotenv.java:33)
at com.mytest.KeyLoaderListener.<init>(KeyLoaderListener.java:30)