Hop Server

Hop Server is a lightweight, Jetty-based server for remote execution of workflows and pipelines.

Except for remote execution, Hop Server can also be accessed directly through a number of REST services.

Start Hop Server

Hop Server is available as a script in your Hop installation directory.

Run Hop Server without any parameters to display its usage options. On Windows, this is hop-server.bat, on Mac and Linux, run hop-server.sh.

The output you’ll get is similar to what is in the screenshot below.

Hop Server - Options

Hop Server takes a hostname or ip address and port number as unnamed arguments. All other arguments are named. Alternatively, the options can be provided in a configuration XML file. TODO: document XML configuration file structure.

hop-server <Interface address> <Port> [-h] [-p <arg>] [-s] [-u <arg>]


hop-server <Configuration File>

The Hop Server options are listed in detail in the table below:

Short Extended Description



This help text



The administrator password. Required only if stopping the Hop Server server.



Stop the running hopServer server. This is only allowed when using the hostname/port form of the command.



The administrator user name. Required only if stopping the Hop Server server.

Example startup commands are:

hop-server.sh 8080
hop-server.sh 8081
hop-server.sh /foo/bar/hop-server-config.xml
hop-server.sh http://www.example.com/hop-server-config.xml
hop-server.sh 8080 -s -u cluster -p cluster

Starting a Hop Server on the local machine on port 8081 will only take 1 or 2 seconds.

The console output will look similar to what is listed below:

2020/06/20 18:35:12 - HopServer - Installing timer to purge stale objects after 1440 minutes.
2020/06/20 18:35:12 - HopServer - Created listener for webserver @ address : localhost:8081

Connect to the Hop Server UI

To connect to the previously started server, point your browser to http://localhost:8081.

You’ll be prompted for your username and password. The default is cluster for both the username and password. The defaults obviously should be changed in any environment that goes beyond a simple local developer setup.

Click 'Show status' to move beyond the initial screen.

Hop Server - Index

Since no workflows or pipelines have been executed on this server yet, the workflow and pipelines lists will be empty.

Hop Server - No Tasks

TODO: explain UI for workflows, pipelines

Hop Server Web Services Overview

TODO: explain Hop Server web services.