How can I find the version of XWiki I'm running?

Several possibilities:

• Check the bottom of any page and if you haven't overwritten the default skin/templates you should see something like:

  

• Create a new page or edit any existing page in wiki model, put the following and click the 'preview' button, it will display your XWiki version:
  {{velocity}}
  $xwiki.version
  {{/velocity}}

  or

  {{velocity}}
  $services.extension.core.repository.environmentExtension.id.version
  {{/velocity}}
• Access your server's filesystem and inside XWiki's WEB-INF/lib directory look for JARs using the format xwiki-*-<version>.jar. The <version> part will be your version.
• From Java:
  @Inject
  private CoreExtensionRepository coreExtensionRepository;
  ...
  CoreExtension distributionExtension = this.coreExtensionRepository.getEnvironmentExtension()
  Version version = distributionExtension.getId().getVersion()