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eHour is mainly developed in Java 7 and Scala. As of eHour 1.4.2, the intention is not to to add any new Scala code but quickly migrate to Java 8 for quicker compile times, better IDE support, readable syntax and stacktraces that don't an enigma to decypher.


eHour has a classic 3-tier architecture with a persistence layer (eHour-persistence), service layer (eHour-service) and view layer (eHour-wicketweb).

Complete stack

  • Hibernate
  • Spring
  • Apache Wicket
  • AOP
  • JQuery
  • Highcharts
  • Selenium
  • Maven
  • Java 7
  • Scala


eHour's source is versioned at Github:

Gitflow is loosely followed: the current released version is in master while the version being developed is in the develop branch. The nightly builds are build from the develop branch. Any features that take a considerable amount of time to develop lives in a feature/<feature name> branch. After the feature is finished that branch is merged into the develop branch.


The code is divided in a number of modules:

Maven module nameDescription
eHour-auditContains the aspect for the audit log. Only one annotation is in this module but the annotation is used by the service and web tier
eHour-commonContains common functionality and all the domain objects. Domain objects are shared between the 3 tiers.
eHour-jettyThe embedded Jetty server as used by the standalone version and the selenium end-to-end tests
eHour-persistenceThe data access objects for all supported databases, the Derby (embedded DB) validator and Derby native SQL queries.
eHour-persistence-mysqlThe MySQL native SQL queries plus MySQL SQL scripts.
eHour-persistence-postgresqlDitto for Postgresql
eHour-seleniumEnd-to-end tests with Selenium
eHour-serviceThe service tier with all the business logic
eHour-standaloneThe assembly package and install4j scripts for building the standalone executables
eHour-warThe assembly package for building the WAR
eHour-webContains static HTML, CSS and Javascript
eHour-wicketwebThe view tier


The reason for splitting out eHour-web and eHour-wicketweb is the different packaging for the standalone and WAR distribution.

Building with Maven

To build with Maven 3, use the standard "mvn clean install".


Apart from the default build there are two profiles:

prodmvn clean install -PprodBuilds the ehour-<version> The standalone executables are built with install4j 5 however the license file cannot be shared.
e2emvn clean install -Pe2eBuilds and executes the end-to-end Selenium tests.


Speeding up compile time

The Scala classes take a while to compile. To speed up compile time over multiple iterations, you might want to run a Zinc compile server. Download Zinc from and run it in before compiling with Maven. In Maven's output you will see a message that the Zinc compile server is being used.

Developing in IntelliJ

Clone the source and open the POM file as a project. For Scala support you want to have the Scala plugin installed.

To run eHour from IntelliJ, create a runtime configuration like:

Developing in Eclipse



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