Java verbose class loading

I guess your best bet is to do the following:

• Output some fixed text once your main method starts and right before it ends.
• Pipe the verbose output into a file
• Use things like less or grep to find the classes loaded between the two tags from the main method.

There's a similar question and some answers here: Is there a way to get which classes a ClassLoader has loaded?

Did you try -verbose:class?

Here's a sed expression that will parse the output of java -verbose:class to produce pairs of loaded class name and its jar file. You can further pipe through a sort to get unique jar files. For example,

java -verbose:class -version 2>/dev/null |
  sed -ne 's/\[Loaded \(.\+\) from \(.\+\)\]/\2/p' | 
  sort -u

outputs

/usr/local/jdk1.7.0_67/jre/lib/rt.jar