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You can USE isErrorPage=”TRUE” in PAGE ATTRIBUTE

You can use isErrorPage=”true” in page attribute

Basically it depends on the scenario , how you can HANDLE. You need handle this in dao layer, when doing insert OPERATION you can CALL an utility method which will LOAD the context ServletContextListener. Because, servlets are basically used for handling request and give the response.

Basically it depends on the scenario , how you can handle. You need handle this in dao layer, when doing insert operation you can call an utility method which will load the context ServletContextListener. Because, servlets are basically used for handling request and give the response.

You NEED to do few tuning for this achievement. Few points below:

1. Use init() METHOD for all expensive operation during initialization (may be static data or cached data ).
2. ALWAYS AVOID auto loading of SERVLET.
3. Avoid SingleThreadModel.
4. Use and control HttpSession properly.

You need to do few tuning for this achievement. Few points below:

INIT() method is one of the life cycle method of servlet. This method runs once in total life. After servlet INSTANCE created and before it HANDLES request the init() method will work. Its basically USED for initializing VALUES at the time of application startup.

init() method is one of the life cycle method of servlet. This method runs once in total life. After servlet instance created and before it handles request the init() method will work. Its basically used for initializing values at the time of application startup.

String, Integer ,Float ,ETC. BASICALLY all wrapper classed are FINAL.

String, Integer ,Float ,etc. Basically all wrapper classed are final.

Marker interface is an interface which help us to NOTIFY few information to JVM/Compiler. The marker interface does not have any BODY, it’s a empty interface. Ex. Cloneable, SERIALIZATION, ETC.

Marker interface is an interface which help us to notify few information to JVM/Compiler. The marker interface does not have any body, it’s a empty interface. Ex. Cloneable, Serialization, etc.

Garbage collection is a special FEATURE in java LANGUAGE. It helps DEVELOPER to save TIME and extra mental tension for handling object allocation in memory. It automatically clean the unused object from memory which helps to allocate space at runtime. When there is no reference to an object FOUND, it will clean that object from memory . You can run the garbage collection explicitly by using System.gc().

Garbage collection is a special feature in java language. It helps developer to save time and extra mental tension for handling object allocation in memory. It automatically clean the unused object from memory which helps to allocate space at runtime. When there is no reference to an object found, it will clean that object from memory . You can run the garbage collection explicitly by using System.gc().

Both are looks similar. But, the basic difference is ABSTRACT class can contain abstract and non abstract methods, where interface only contains abstract METHOD (without method body). You can DECLARE fields that are not static and final, and define PUBLIC, protected, and private CONCRETE methods in abstract class. But, in Interface all members are public, static and final , all methods are public.

Both are looks similar. But, the basic difference is abstract class can contain abstract and non abstract methods, where interface only contains abstract method (without method body). You can declare fields that are not static and final, and define public, protected, and private concrete methods in abstract class. But, in Interface all members are public, static and final , all methods are public.

Its ALWAYS PASS by VALUE .

Its always pass by value .