After installation try to open page is blank

Question

hello every one
i m new user of apex
i have install apex apex_4.2.2_en
ALTER USER ANONYMOUS ACCOUNT UNLOCK;
4. run EXEC DBMS_XDB.SETHTTPPORT(8080);
(5. Not documented but restart listener and database)
After all required configurations,
1. Log into to http://host:8080/apex/apex_admin
2. Create a workspace, and admin user for the workspace
3. Log into http://host:8080/apex using step2
4. Go to Application Builder, and run pre-installed Sample Application
5. Log into the sample application, and click a link
The dialog always displays when clicking link.
i m try to open http://host:8080/apex/apex_admin but it show blank screen
any idea

Answer 1

IF YOU ALREADY HAVE INSTALLED IMAGES USING apxldimg.sql then it could be the problem of XDB.
Please run the following script from your sys and let me know if that works,
DECLARE
l_configxml XMLTYPE;
l_value VARCHAR2(5) := 'true'; -- (true/false)
BEGIN
l_configxml := DBMS_XDB.cfg_get();
IF l_configxml.existsNode('/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access') = 0 THEN
-- Add missing element.
SELECT insertChildXML
l_configxml,
'/xdbconfig/sysconfig/protocolconfig/httpconfig',
'allow-repository-anonymous-access',
XMLType('<allow-repository-anonymous-access xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd">' ||
l_value ||
'</allow-repository-anonymous-access>'),
'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'
INTO l_configxml
FROM dual;
DBMS_OUTPUT.put_line('Element inserted.');
ELSE
-- Update existing element.
SELECT updateXML
DBMS_XDB.cfg_get(),
'/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access/text()',
l_value,
'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'
INTO l_configxml
FROM dual;
DBMS_OUTPUT.put_line('Element updated.');
END IF;
DBMS_XDB.cfg_update(l_configxml);
DBMS_XDB.cfg_refresh;
END;