code: private synchronized void purgeJspRepository() {
  
          CmsJspLoader cmsJspLoader = (CmsJspLoader)OpenCms.getResourceManager().getLoader(
              CmsJspLoader.RESOURCE_LOADER_ID);
  
          cmsJspLoader.triggerPurge(new Runnable() {
  
              @SuppressWarnings("synthetic-access")
              public void run() {
  
                  clear();
              }
          });
      }
docs: This method purges the JSP repository dirs,
  i.e. it deletes all JSP files that OpenCms has written to the
  real FS.<p>
  
  Obviously this method must be used with caution.
  Purpose of this method is to allow
  a complete purge of all JSP pages on a machine after
  a major update of JSP templates was made.<p>