Knowledge Base

Why do I need Java?

In order to access the simulation tools, you must have Java version 1.4 or later installed on your machine and enabled in your web browser. Note that Java is not the same as Javascript. Visit the Java website to verify which version of Java is installed on your browser. You can also upgrade to the latest release of Java. If you do not have access to install plug-ins, please contact your system administrator about installing or upgrading your Java.

Known Issues

  • KDE Konqueror
    To enable Java in the KDE Konqueror browser, make sure that the Java preferences are enabled and that Use KIO is checked. In the box that specifies the path to the java executable, simply typing java often works better than the full path to the executable.

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Debug Console

Close18 MBRequestSessionTimelineDatabase42Events21
$_GET
Array( ) Array(

)
$_POST
Array( ) Array(

)
$_COOKIE
Array( ) Array(

)
$_SERVER
Array( NO_PROXY => .s2.internal, https_proxy => http://10.8.63.5:3128, http_proxy => http:/... Array(
NO_PROXY => .s2.internal,
https_proxy => http://10.8.63.5:3128,
http_proxy => http://10.8.63.5:3128,
USER => apache,
HOME => /var/www,
FCGI_ROLE => RESPONDER,
REDIRECT_HTTP_AUTHORIZATION => ,
REDIRECT_SCRIPT_URL => /kb/misc/java,
REDIRECT_SCRIPT_URI => https://datacenterhub.org/kb/misc/java,
REDIRECT_HTTPS => on,
REDIRECT_STATUS => 200,
HTTP_AUTHORIZATION => ,
SCRIPT_URL => /kb/misc/java,
SCRIPT_URI => https://datacenterhub.org/kb/misc/java,
HTTPS => on,
HTTP_USER_AGENT => CCBot/2.0 (https://commoncrawl.org/faq/),
HTTP_ACCEPT => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8,
HTTP_ACCEPT_LANGUAGE => en-US,en;q=0.5,
HTTP_ACCEPT_ENCODING => br,gzip,
HTTP_HOST => datacenterhub.org,
HTTP_CONNECTION => Keep-Alive,
PATH => /sbin:/usr/sbin:/bin:/usr/bin,
SERVER_SIGNATURE => ,
SERVER_SOFTWARE => Apache,
SERVER_NAME => datacenterhub.org,
SERVER_ADDR => 10.111.11.100,
SERVER_PORT => 443,
REMOTE_ADDR => 10.111.11.10,
DOCUMENT_ROOT => /var/www/datacenterhub,
SERVER_ADMIN => root@localhost,
SCRIPT_FILENAME => /var/www/datacenterhub/index.php,
REMOTE_PORT => 25809,
REDIRECT_URL => /kb/misc/java,
GATEWAY_INTERFACE => CGI/1.1,
SERVER_PROTOCOL => HTTP/1.1,
REQUEST_METHOD => GET,
QUERY_STRING => ,
REQUEST_URI => /kb/misc/java,
SCRIPT_NAME => /index.php,
PHP_SELF => /index.php,
REQUEST_TIME_FLOAT => 1591201359.1302,
REQUEST_TIME => 1591201359,
argv => Array(

)
,
argc => 0
)
separator .
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tracker.sid 9ffbbed8f4b3750563a3b804b697eef9
tracker.ssid 9ffbbed8f4b3750563a3b804b697eef9
tracker.rsid 9ffbbed8f4b3750563a3b804b697eef9
session.token d4d122a1062eacbc1a7791c1ab8b69dd
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18 MB

42 Queries Logged: 0.010331869125366 seconds

  1. SELECT data
      FROM `jos_session`
      WHERE `session_id` = 'a236d16447e9023679262bffeeda1f95'
  2. DELETE
      FROM `jos_session`
      WHERE `session_id` = 'a236d16447e9023679262bffeeda1f95'
  3. SELECT data
      FROM `jos_session`
      WHERE `session_id` = '9ffbbed8f4b3750563a3b804b697eef9'
  4. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_languages'
  5. SELECT session_id
      FROM `jos_session`
      WHERE `session_id` = '9ffbbed8f4b3750563a3b804b697eef9'
      LIMIT 1
  6. INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('9ffbbed8f4b3750563a3b804b697eef9','0','1591201359','10.111.11.10')
  7. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_members'
  8. SELECT b.id
      FROM `jos_usergroups` AS `a`
      LEFT JOIN jos_usergroups AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
      WHERE `a`.`id` = '1'
  9. SELECT *
      FROM `jos_viewlevels`
  10. SELECT folder AS type,element AS name,protected,params
      FROM `jos_extensions`
      WHERE `enabled` >= '1'
      AND `type` = 'plugin'
      AND `state` >= '0'
      AND `access` IN ('1','1','4')
      ORDER BY `ordering` ASC
  11. SELECT m.id,m.menutype,m.title,m.alias,m.note,m.path AS route,m.link,m.type,m.level,m.language,m.browserNav,m.access,m.params,m.home,m.img,m.template_style_id,m.component_id,m.parent_id,e.element AS component
      FROM `jos_menu` AS `m`
      LEFT JOIN jos_extensions AS e
      ON e.extension_id = m.component_id
      WHERE `m`.`published` = '1'
      AND `m`.`parent_id` > '0'
      AND `m`.`client_id` = '0'
      ORDER BY `m`.`lft` ASC
  12. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_kb'
  13. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_tags'
  14. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_categories'
  15. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`extension` = 'com_kb'
      AND `jos_categories`.`alias` = 'misc'
      AND `jos_categories`.`published` = '1'
  16. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`extension` = 'com_kb'
      AND `jos_categories`.`alias` = 'java'
      AND `jos_categories`.`published` = '1'
  17. SELECT jos_template_styles.id,jos_template_styles.home,jos_template_styles.template,jos_template_styles.params,jos_extensions.protected
      FROM `jos_template_styles`
      INNER JOIN jos_extensions
      ON jos_extensions.element = jos_template_styles.template
      WHERE `jos_template_styles`.`client_id` = '0'
      AND `jos_extensions`.`enabled` = '1'
      AND `jos_extensions`.`type` = 'template'
      AND jos_extensions.`client_id` = `jos_template_styles`.`client_id`
      ORDER BY `home` DESC
  18. SELECT *
      FROM `jos_kb_articles`
      WHERE `jos_kb_articles`.`alias` = 'java'
      AND `jos_kb_articles`.`category` = '20'
  19. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`id` = '20'
  20. SELECT jos_tags_object.label,jos_tags.*
      FROM `jos_tags`
      INNER JOIN jos_tags_object
      ON jos_tags_object.tagid = jos_tags.id
      WHERE `jos_tags_object`.`tbl` = 'kb'
      AND `jos_tags_object`.`objectid` = '13'
      AND `jos_tags`.`admin` NOT IN ('1')
      GROUP BY jos_tags_object.label,jos_tags.id
  21. SELECT category,count(*) AS articles
      FROM `jos_kb_articles`
      WHERE `jos_kb_articles`.`state` = '1'
      AND `jos_kb_articles`.`access` IN ('1','1','4')
      GROUP BY category
  22. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`extension` = 'com_kb'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
      AND `jos_categories`.`parent_id` = '1'
      ORDER BY `title` ASC
  23. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '19'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  24. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '18'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  25. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '20'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  26. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '24'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  27. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '25'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  28. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '21'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  29. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '22'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  30. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '23'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1','4')
  31. SELECT *
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      WHERE `jos_kb_comments`.`entry_id` = '13'
      AND `jos_kb_comments`.`state` IN ('1','3')
  32. SELECT *
      FROM `jos_kb_comments`
      WHERE `jos_kb_comments`.`id` = '0'
  33. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_users'
  34. SELECT m.id,m.title,m.module,m.position,m.content,m.showtitle,m.params,mm.menuid,e.protected
      FROM `jos_modules` AS `m`
      LEFT JOIN jos_modules_menu AS mm
      ON mm.moduleid = m.id
      LEFT JOIN jos_extensions AS e
      ON e.element = m.module
      AND e.client_id = m.client_id
      WHERE `m`.`published` = '1'
      AND `e`.`enabled` = '1'
      AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= '2020-06-03 16:22:39' )
      AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= '2020-06-03 16:22:39' )
      AND `m`.`access` IN ('1','1','4')
      AND `m`.`client_id` = '0'
      AND (`mm`.`menuid` = '82' OR `mm`.`menuid` <= '0' )
      ORDER BY `m`.`position` ASC,`m`.`ordering` ASC
  35. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_content'
  36. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_resources'
  37. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_usage'
  38. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_groups'
  39. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_feedback'
  40. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_support'
  41. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_wishlist'
  42. UPDATE `jos_session`
      SET `data` = '__default|a:10:{s:15:\"session.counter\";i:1;s:19:\"session.timer.start\";i:1591201359;s:18:\"session.timer.last\";i:1591201359;s:17:\"session.timer.now\";i:1591201359;s:8:\"registry\";O:23:\"Hubzero\\Config\\Registry\":2:{s:7:\"\0*\0data\";O:8:\"stdClass\":1:{s:1:\"0\";s:7:\"session\";}s:9:\"separator\";s:1:\".\";}s:4:\"user\";C:17:\"Hubzero\\User\\User\":22:{a:1:{s:5:\"guest\";b:1;}}s:11:\"tracker.sid\";s:32:\"9ffbbed8f4b3750563a3b804b697eef9\";s:12:\"tracker.ssid\";s:32:\"9ffbbed8f4b3750563a3b804b697eef9\";s:12:\"tracker.rsid\";s:32:\"9ffbbed8f4b3750563a3b804b697eef9\";s:13:\"session.token\";s:32:\"d4d122a1062eacbc1a7791c1ab8b69dd\";}',`time` = '1591201359',`ip` = '10.111.11.10'
      WHERE `session_id` = '9ffbbed8f4b3750563a3b804b697eef9'

17 Query Types Logged, Sorted by Occurrences.

SELECT Tables:
  1. 13 × SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
  2. 12 × SELECT *
      FROM `jos_categories`
  3. 2 × SELECT data
      FROM `jos_session`
  4. 2 × SELECT *
      FROM `jos_kb_comments`
  5. 1 × SELECT m.id,m.title,m.module,m.position,m.content,m.showtitle,m.params,mm.menuid,e.protected
      FROM `jos_modules` AS `m`
      LEFT JOIN jos_modules_menu AS mm
      ON mm.moduleid = m.id
      LEFT JOIN jos_extensions AS e
      ON e.element = m.module
      AND e.client_id = m.client_id
  6. 1 × SELECT *
      FROM `jos_kb_articles`
  7. 1 × SELECT jos_tags_object.label,jos_tags.*
      FROM `jos_tags`
      INNER JOIN jos_tags_object
      ON jos_tags_object.tagid = jos_tags.id
  8. 1 × SELECT category,count(*) AS articles
      FROM `jos_kb_articles`
  9. 1 × SELECT m.id,m.menutype,m.title,m.alias,m.note,m.path AS route,m.link,m.type,m.level,m.language,m.browserNav,m.access,m.params,m.home,m.img,m.template_style_id,m.component_id,m.parent_id,e.element AS component
      FROM `jos_menu` AS `m`
      LEFT JOIN jos_extensions AS e
      ON e.extension_id = m.component_id
  10. 1 × SELECT session_id
      FROM `jos_session`
  11. 1 × SELECT b.id
      FROM `jos_usergroups` AS `a`
      LEFT JOIN jos_usergroups AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
  12. 1 × SELECT *
      FROM `jos_viewlevels
  13. 1 × SELECT folder AS type,element AS name,protected,params
      FROM `jos_extensions`
  14. 1 × SELECT jos_template_styles.id,jos_template_styles.home,jos_template_styles.template,jos_template_styles.params,jos_extensions.protected
      FROM `jos_template_styles`
      INNER JOIN jos_extensions
      ON jos_extensions.element = jos_template_styles.template
OTHER Tables:
  1. 1 × UPDATE `jos_session`
      SET `data` = '__default|a:10:{s:15:\"session.counter\";i:1;s:19:\"session.timer.start\";i:1591201359;s:18:\"session.timer.last\";i:1591201359;s:17:\"session.timer.now\";i:1591201359;s:8:\"registry\";O:23:\"Hubzero\\Config\\Registry\":2:{s:7:\"\0*\0data\";O:8:\"stdClass\":1:{s:1:\"0\";s:7:\"session\";}s:9:\"separator\";s:1:\".\";}s:4:\"user\";C:17:\"Hubzero\\User\\User\":22:{a:1:{s:5:\"guest\";b:1;}}s:11:\"tracker.sid\";s:32:\"9ffbbed8f4b3750563a3b804b697eef9\";s:12:\"tracker.ssid\";s:32:\"9ffbbed8f4b3750563a3b804b697eef9\";s:12:\"tracker.rsid\";s:32:\"9ffbbed8f4b3750563a3b804b697eef9\";s:13:\"session.token\";s:32:\"d4d122a1062eacbc1a7791c1ab8b69dd\";}',`time` = '1591201359',`ip` = '10.111.11.10'
  2. 1 × INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('9ffbbed8f4b3750563a3b804b697eef9','0','1591201359','10.111.11.10'
  3. 1 × DELETE
      FROM `jos_session`
  • onAfterInitialise Method plgSystemP3p::onAfterInitialise /core/plugins/system/p3p/p3p.php:21
  • onAfterInitialise Method plgSystemRemember::onAfterInitialise /core/plugins/system/remember/remember.php:20
  • onAfterInitialise Method plgSystemHubzero::onAfterInitialise /core/plugins/system/hubzero/hubzero.php:21
  • onAfterInitialise Method plgSystemXFeed::onAfterInitialise /core/plugins/system/xfeed/xfeed.php:21
  • onAfterInitialise Method plgSystemSupergroup::onAfterInitialise /core/plugins/system/supergroup/supergroup.php:113
  • onAfterInitialise Method plgSystemReferrerpolicy::onAfterInitialise /core/plugins/system/referrerpolicy/referrerpolicy.php:21
  • onAfterRoute Method plgSystemJquery::onAfterRoute /core/plugins/system/jquery/jquery.php:21
  • onAfterRoute Method plgSystemSpamjail::onAfterRoute /core/plugins/system/spamjail/spamjail.php:21
  • onAfterRoute Method plgSystemPassword::onAfterRoute /core/plugins/system/password/password.php:21
  • onAfterRoute Method plgSystemIncomplete::onAfterRoute /core/plugins/system/incomplete/incomplete.php:21
  • onAfterRoute Method plgSystemUnconfirmed::onAfterRoute /core/plugins/system/unconfirmed/unconfirmed.php:21
  • onAfterRoute Method plgSystemUnapproved::onAfterRoute /core/plugins/system/unapproved/unapproved.php:21
  • onContentPrepare Method plgContentLoadmodule::onContentPrepare /core/plugins/content/loadmodule/loadmodule.php:35
  • onContentPrepare Method plgContentEmailcloak::onContentPrepare /core/plugins/content/emailcloak/emailcloak.php:25
  • onContentPrepare Method plgContentPagebreak::onContentPrepare /core/plugins/content/pagebreak/pagebreak.php:35
  • onContentPrepare Method plgContentXhubtags::onContentPrepare /core/plugins/content/xhubtags/xhubtags.php:25
  • onContentPrepare Method plgContentFormathtml::onContentPrepare /core/plugins/content/formathtml/formathtml.php:105
  • onContentPrepare Method plgContentExternalhref::onContentPrepare /core/plugins/content/externalhref/externalhref.php:41
  • onAfterDispatch Method plgSystemDebug::onAfterDispatch /core/plugins/system/debug/debug.php:60
  • onAfterDispatch Method PlgSystemHighlight::onAfterDispatch /core/plugins/system/highlight/highlight.php:25
  • onAfterRender Method plgSystemSef::onAfterRender /core/plugins/system/sef/sef.php:21