Velocity dependencies

Velocity has a number of external jar dependencies. However, not all of these are needed every time. This document should help you do decide which jars must also be present if you want to integrate Velocity into your application.

All of these jars must be present when building Apache Velocity. The build process downloads all of them automatically from the Internet.

jar nameRequiredExplanation
commons-collectionsYes Needed for all parts of Velocity
commons-langYes Needed for all parts of Velocity
commons-loggingNo Must be present if log system is configured to use CommonsLogLogChute. Otherwise, it is not needed.
oroYes Must be present if you have Velocity configured to automatically escape references. Otherwise, it is not needed.
log4jNo Must be present if log4j Logging has been selected. Not needed if any other logging style has been selected.
logkit (or avalon-logkit)No Must be present if Avalon Logging has been selected. Not needed if any other logging style has been selected.
servletapiNo Only needed when the ServletLogChute is used. Should normally be supplied by the servlet container.

The most common case is the integration of the Velocity runtime into your application. In this case, you must add commons-collections and commons-lang to your application (and optional Oro or commons-logging if required). If you already have one or more of these libraries in your application, you should check if you need to update their versions.

Take a look at each module documentation to see all dependencies in detail