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What is ejisto?

Developing the "presentation" layer of a distributed web application is a hard life. You have to fight every day against database synchronization, binary data incompatibility, system integration failures and so on.

But do you really care...

  • if database is up to date?
  • if two systems are well interconnected?
  • if remote server is up and running?
  • if third-party web service is doing its job?

These things are not actually related with your job. You should focus on the front-end part of the application, but you should be also able to see (and test) your changes to a dynamic page.

How to do that?

There are two possible ways:

  • ask your colleagues to write tons of mock objects for each kind of connector, and keep them always up-to-date. For each release, for each little data model modification or remote interface change
  • use ejisto!!

ejisto is (or will be) a sandbox for your application. It moves the focus on the front-end side cutting all the links between your pages and the rest of the world.

How does it work?

No magic here: ejisto makes a full scan of your web application classes during configuration process, registering all the relevant classes and their fields (no source/binary files are modified during the scan) After that, you can start the embedded Servlet Container instance; then ejisto registers itself as instrumentation agent and dynamically modifies registered java classes at load time, giving you a fully featured application without worries about configuration, integration issues and so on.

how does it work

May I try it?

Of course! You can either download the latest release or the source code from github.


The Java runtime environment (JRE) version 8 or later is required to start the application. You can download it from To check the version of your JRE, you can use the following command on your favourite shell:

$ java -version

Ejisto should run on all systems already supported by the JRE. However, at the moment it is developed and tested only on Slackware Linux. Should you have problems on other systems, please create an issue describing what actually happened (an attached log file would be really helpful)

Download and launch the latest release

The latest release can be found on the bintray repository. After you downloaded and unzipped the application archive, launch the following command, depending on your platform:

linux / mac (?):

$ /your-installation-path/ejisto/


> C:\your-installation-path\ejisto\ejisto.bat

Build from sources

Please note that a JDK 8+ and Apache Maven are required in order to build and run the application. After cloning ejisto's repository, try to build the application:

$ mvn -am -pl application clean install

launch the application:

$ cd application
$ mvn exec:exec

and then open the following URL with your favourite browser


Of course, all registered names are Copyright of their respective owners.

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