InvalidMonitorStateException

This exception is thrown when we call wait(), notify() or notifyAll() methods from any object when we are not having lock on that object.

This exception is a sub-class of RuntimeException. So we donot need to handle this.
Also this is the reason why the signatures of  wait(), notify() or notifyAll() do not have this exception declared .

Thread.run() and Thread.start()

Thread.start() essentially calls run() method only.
If we call Thread.run() directly, it will be executed in the same thread and a new thread would not be created.
So the purpose of multithreading is not fulfilled.

Defining priority / order of advice in Spring AOP

We can use @Order annotation to define the Order of advice

Webservices - Basics

1. Service over web
2. Language independent
3. Communicate mostly over HTTP, but can communicate over other transfer protocols as well
4. Two types : SOAP(Simple Object Access Protocol) based and REST(representational State Transfer) style
5. The client of webservices is generally an application without any user interface.
6. In a SOAP based webservice, a client generally sends SOAP document as request and gets SOAP based document as response. In a REST style WS, a client might send a standard http request and get an XML document as response.
7. Java 6 supports JAX-WS which supports both REST and SOAP webservices.