https://github.com/eclipse-vertx/vertx-sql-client: The Reactive MySQL Client (Eclipse) 
public final class io.vertx.mysqlclient.impl.protocol.Packets$ParameterFlag
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.vertx.mysqlclient.impl.protocol.Packets$ParameterFlag
  super_class: java.lang.Object
{
  public static final int UNSIGNED;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 128

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.vertx.mysqlclient.impl.protocol.Packets$ParameterFlag this
         0: .line 115
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.vertx.mysqlclient.impl.protocol.Packets$ParameterFlag this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/vertx/mysqlclient/impl/protocol/Packets$ParameterFlag;
}
SourceFile: "Packets.java"
NestHost: io.vertx.mysqlclient.impl.protocol.Packets
InnerClasses:
  public final ParameterFlag = io.vertx.mysqlclient.impl.protocol.Packets$ParameterFlag of io.vertx.mysqlclient.impl.protocol.Packets