Error :
When we logged in to EM, there was an error “java.lang.Exception: Exception in sending Request :: null” and the page was not displayed properly.
Reason:
Timezone settings are not set correctly.
Solution:
Find the timezone knowledge of the operating system.
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						bash-3.00$ echo $TZ Europe/Istanbul  | 
					
Stop EM services.
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						$emctl stop dbconsole  | 
					
Make the agentTZRegion = XXXXX line in the “$ORACLE_HOME/<servername>_<sid>/sysman/config/emd.properties” file the same as the timezone information of the operating system.
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						agentTZRegion=Europe/Istanbul  | 
					
Restart EM services.
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						$emctl start dbconsole  |