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Published Jul. 2, 2025

Unable to reindex the search as "Resource" option under Server Administration is blank

Written By

Sivakumar Perumal

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Issue

  • The "Resource" option (Control Panel → Configuration → Server Administration → Resource) is blank due to which "Execute Reindex all searches" is not possible and the below error is observed on the server console.

    ERROR [default task-98][IncludeTag:128] Current URL /group/control_panel/manage?p_p_id=com_liferay_server_admin_web_portlet_ServerAdminPortlet&p_p_lifecycle=0&p_p_state=maximized&p_p_mode=view&_com_liferay_server_admin_web_portlet_ServerAdminPortlet_mvcRenderCommandName=%2Fserver_admin%2Fview&_com_liferay_server_admin_web_portlet_ServerAdminPortlet_tabs1=resources&_com_liferay_server_admin_web_portlet_ServerAdminPortlet_tabs2= generates exception: java.lang.NullPointerException
    java.lang.NullPointerException
     at com.liferay.portal.kernel.backgroundtask.display.BaseBackgroundTaskDisplay.getBackgroundTaskStatusAttributeLong(BaseBackgroundTaskDisplay.java:133)
     at com.liferay.portal.search.internal.background.task.display.ReindexBackgroundTaskDisplay.getPercentage(ReindexBackgroundTaskDisplay.java:37)
     at com.liferay.portal.kernel.backgroundtask.display.BaseBackgroundTaskDisplay.hasPercentage(BaseBackgroundTaskDisplay.java:77)
     at org.apache.jsp.resources_jsp._jspService(resources_jsp:900)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

Environment

  • Liferay DXP 7.0

Resolution

  • "Resource" option will show blank when there is some data present in the lock_ and backgroundtask table related to reindexing and clearing the same would help to access the Resource option.
  • Steps to clear the data present in both tables:
    Go to Control Panel > Configurations > Server Administration > Script, paste the below groovy script one by one and execute.

    a) Remove the reindex lock entry using the following groovy script: 

    com.liferay.portal.lock.service.LockLocalServiceUtil.deleteLock(long lockId)
    out.println(Deleted Lock Entry);
    Replace the lockId with the respective Id present in the database.

    b) Remove the reindex BackgroundTask entry using following groovy script: 

    com.liferay.portal.background.task.service.BackgroundTaskLocalServiceUtil.deleteBackgroundTask(long backgroundTaskId)
    out.println(Deleted BackgroundTask Entry);

    Replace the backgroundTaskId with the respective Id present in the database.

Additional information

Important Note: Taking a complete back up of the environment before doing any changes would help if anything unexpected happens.

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