| Title: Apache Velocity Tools Dependencies |
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| ## Dependencies |
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| VelocityTools requires certain external jar dependencies at different times. These charts should help you determine which jars you need and when. |
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| Since VelocityTools relies on Velocity Engine, please also check [Engine dependencies](/engine/2.0/dependencies.html). |
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| Note: Java version 1.7+ is required for compilation, testing and use of VelocityTools 3.x. |
| {.note} |
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| ### GenericTools |
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| Jar Name | Version | Compile | Tests | Runtime | Notes |
| ---------|---------|---------|-------|---------|------ |
| velocity | 2.0+ | Yes | Yes | Yes | Required for core infrastructure and several tools |
| commons-beanutils | 1.9.4 | Yes | Yes | Yes | Required for core infrastructure and several tools |
| commons-digester3 | 3.2 | Yes | Yes | Yes | Required for [xml configuration](config-xml.html) (and [UIDependencyTool](apidocs/org/apache/velocity/tools/view/UiDependencyTool.html) view tool) |
| com.github.cliftonlabs.json-simple | 1.1.1 | Yes | No | No | Required for [JsonTool](apidocs/org/apache/velocity/tools/generic/JsonTool.html) |
| junit | 4.13.1 | No | Yes | No | Only required for tests. |
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| ### VelocityView |
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| Jar Name | Version | Compile | Tests | Runtime | Notes |
| ---------|---------|---------|-------|---------|------ |
| velocity-tools-generic | 3.0 | Yes | Yes | Yes | |
| servletapi | 3.1.0 | Yes | Yes | No | Required for most view tools (provided by the J2EE container) |
| junit | 4.13.1 | No | Yes | No | Only required for tests |
| easymock | 4.2 | No | Yes | No | Only required for tests |
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| ## SLF4J Binding |
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| At runtime, Velocity Tools will require an SLF4J binding to be present in the path. Typically, one of: |
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| + [AVSL](http://software.clapper.org/avsl/) - “A Very Simple Logger” |
| + [SLF4J JDK14 Adapter](http://www.slf4j.org/api/org/slf4j/impl/JDK14LoggerAdapter.html) - redirect logs towards Java 1.4+ logging framework |
| + [SLF4J Log4J Adapter](http://www.slf4j.org/api/org/slf4j/impl/Log4jLoggerAdapter.html) - redirects logs towards Log4J |
| + [SLF4J Simple Logger](http://www.slf4j.org/api/org/slf4j/impl/SimpleLogger.html) - minimalistic logger |
| + [SLF4J Android](http://www.slf4j.org/android/) - logger for Android platforms |
| + [LogBack](http://logback.qos.ch/) - full featured logging framework |
| + [WebApp SLF4J Logger](https://github.com/arkanovicz/webapp-slf4j-logger) - redirects logs towards the J2EE container log |
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