Here is a link to a webcast about the Classloader Analysis Tool (CAT) that can be helpful for weird behaviour or getting a better insight about ClassNotFound Exceptions. I did it a while ago and it almost got lost. It all applies to Java Cloud Service (JCS) too.
Note that JCS also comes with the Java Flight Recorder (JFR), which is a cool feature and even allows you to drill down to the JDBC level an see SQL statements with exceedingly long execution times.
Oracle WebLogic Server 12c Book
Oracle Middleware and Cloud Computing Book
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