https://github.com/eclipse-vertx/vertx-sql-client: The Reactive MySQL client (Eclipse) 
public class io.vertx.mysqlclient.impl.command.DebugCommand extends io.vertx.sqlclient.impl.command.CommandBase<java.lang.Void>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.vertx.mysqlclient.impl.command.DebugCommand
  super_class: io.vertx.sqlclient.impl.command.CommandBase
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.vertx.mysqlclient.impl.command.DebugCommand this
         0: .line 5
            aload 0 /* this */
            invokespecial io.vertx.sqlclient.impl.command.CommandBase.<init>:()V
            return
        end local 0 // io.vertx.mysqlclient.impl.command.DebugCommand this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/vertx/mysqlclient/impl/command/DebugCommand;
}
Signature: Lio/vertx/sqlclient/impl/command/CommandBase<Ljava/lang/Void;>;
SourceFile: "DebugCommand.java"