This developer documentation is outdated, but provides historical context.

It is not user documentation and should not be treated as such.

Documentation is available here.

Backend modules compat

compat (Meaning compatibility) stems from the previous iteration in oVirt’s life. oVirt (Then Solid Ice) was originally written in C#. Following Redhat’s 2008 purchase of Qumranet, the engine was re-written in Java. The compatibility module fills in the gaps of Java, as the re-write originally targeted Java 5 which lacked several features then existing in C#. The compat module is essentially a collection of utility classes that exist in C# and do not in Java.


  • TimeSpan
  • DateTime
  • Event and EventArgs

Deprecation: Many of these classes have been deprecated since the re-write, and recommended classes are to be used instead. StringHelper, for example, is to be avoided and org.apache.commons.lang.StringUtils used instead.