Warning in logs: "No theme found for specified theme id" after uninstalling a theme

Issue

• After migrating, the following warning appears in the logs:

  2025-05-19 08:51:53,593 WARN  [ajp-nio-10.10.13.111-8009-exec-83][ThemeLocalServiceImpl:220] No theme found for specified theme id yourOld_WAR_theme. Returning the default theme.

• The theme yourOld_WAR_theme was uninstalled but the personal sites still have it associated.

Environment

• Liferay DXP 2024.Q3

Resolution

• Use a Groovy script to update the theme for the affected personal sites. When a theme is uninstalled, the theme for the pages or page sets using it is not automatically updated and must be modified manually or with a Groovy script.

  import com.liferay.portal.kernel.service.LayoutLocalServiceUtil
  import com.liferay.portal.kernel.service.LayoutSetLocalServiceUtil
  
  // Define the theme IDs
  def oldThemeId = "yourOld_WAR_theme"
  def newThemeId = "yourNew_WAR_theme"
  
  def dryRun = true
  
  def layouts = LayoutLocalServiceUtil.getLayouts(-1, -1)
  
  layouts.each { layout -
      def themeId = layout.getThemeId()
  
      if (themeId == oldThemeId) {
          println "Found layout using oldThemeId - Layout ID: ${layout.getPlid()}; friendlyURL: ${layout.getFriendlyURL()}; Theme ID: ${themeId}"
  
          if (!dryRun) {
              // Switch to the new theme
              layout.setThemeId(newThemeId)
  
              // Update the layout to save changes
              LayoutLocalServiceUtil.updateLayout(layout)
          }
     }
  }
  
  def layoutSets = LayoutSetLocalServiceUtil.getLayoutSets(-1, -1)
  
  layoutSets.each { layoutSet -
      def themeId = layoutSet.getThemeId()
  
      if (themeId == oldThemeId) {
          println "Found layoutSet using oldThemeId - LayoutSet ID: ${layoutSet.getLayoutSetId()}; Theme ID: ${themeId}"
  
          if (!dryRun) {
              layoutSet.setThemeId(newThemeId)
  
              LayoutSetLocalServiceUtil.updateLayoutSet(layoutSet)
          }
      }
  }