You have installed and configured the Oracle DB event collector but no events are collected. When you view the collector logs it shows an Oracle error for OAUTH marshaling failure.
The JDBC drivers used with the Oracle DB Event Collector is a higher version than the Oracle Database you are attempting to collect from.
Add -Doracle.jdbc.thinLogonCapability\=o3 to the System.AgentParams in the ses_work.properties file to prevent this error.
Example of line after modification:
System.AgentParams=-server -XX\:NewRatio\=3 -Xmx512m -Dnetworkaddress.cache.ttl\=300 -Doracle.jdbc.thinLogonCapability\=o3