I want to learn the internals of tomcat operation and understand the flow.

For this I created a servlet - 

```
public class TestServlet extends HttpServlet {
    //Breakpoint set on constructor
    public TestServlet() {
    }
}

```

I included the tomcat source code in source lookup directories and launched the server in debug mode. Following is the stack trace when debugger stops at my breakpoint - 

```
Daemon Thread [localhost-startStop-1] (Suspended (entry into method <init> in TestServlet)) 
    owns: StandardWrapper  (id=39)  
    owns: StandardContext  (id=40)  
    TestServlet.<init>() line: 12   
    NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not available [native method]   
    NativeConstructorAccessorImpl.newInstance(Object[]) line: 39    
    DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 27    
    Constructor<T>.newInstance(Object...) line: 513 
    Class<T>.newInstance0() line: 355   
    Class<T>.newInstance() line: 308    
    DefaultInstanceManager.newInstance(String) line: 138    
    StandardWrapper.loadServlet() line: 1144    
    StandardWrapper.load() line: 1088   
    StandardContext.loadOnStartup(Container[]) line: 5123   
    StandardContext.startInternal() line: 5407  
    StandardContext(LifecycleBase).start() line: 150    
    ContainerBase$StartChild.call() line: 1559  
    ContainerBase$StartChild.call() line: 1549  
    FutureTask$Sync.innerRun() line: 303    
    FutureTask<V>.run() line: 138   
    ThreadPoolExecutor$Worker.runTask(Runnable) line: 886   
    ThreadPoolExecutor$Worker.run() line: 908   
    Thread.run() line: 662

```

As you can see tomcat initiates a new daemon thread to handle initialization of `TestServlet`. If I step out from this position it would backtrace upto run and then stop. However I want to understand main server logic. **What should I do to step into the `org.apache.catalina.startup.Bootstrap` class?** (or some other class that is run on main startup thread)