How to set a monitor to get the runtime message of a Java application

Question

There is a Java application to be tested. Are there some ways to set a monitor to get which functions are executed? Or are there some ways to set reflections to get some message of the application? Thanks.

Answer 1

There are few ways:

• Use code coverage tools which would generate a report of all executed methods / lines / branches.
  • jacoco [www.jacoco.org]
  • cobertura [cobertura.github.io/cobertura]
  • clover [www.atlassian.com/software/clover]
  • jcov [wiki.openjdk.java.net/display/CodeTools/jcov]
• Implement Java Instrumentation Agent. The following blog posts shows how to calculate method execution time. It should be trivial task to modify it for your needs.
  • http://blog.javabenchmark.org/2013/05/java-instrumentation-tutorial.html
  • http://javapapers.com/core-java/java-instrumentation