web.xml configuration for servlet

Web.xml configuration for Servlet   Configure the servlet For configuring the servlet need to use <servlet> element. In this we will provide the servlet information such as Servlets name and class under the <servlet-name>, <servlet-class> tags respectively. Next step is mapping this servlet to the URL or URL pattern with the help of <servlet-mapping> <?xml…

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Load on Startup Servlet Example

Load on Startup    The <load-on-startup> tag which is present inside the <servlet> tag helps you to control when the servlet has to be loaded by the Container. This load-on-startup tag information present in the web.xml helps the container to load the mentioned servlets as soon as the servlet container starts. If you don’t specify…

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Servlet Life Cycle

Servlet Life Cycle   The Servlet’s life cycle is controlled by the servlet container or web container in which servlet has been deployed, resides in the Web server (most commonly used Web server is Apache tomcat). Whenever request comes from browser, the container performs the following steps Init() method First it checks for the existence…

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Java SE 8 features

Java SE 8 Features Some of the important Java se 8 features are Please click on each link for detailed explanation lambda expressions functional interface foreach method in java.lang.iterable Default methods and Static methods Method References Remaining features will be updated soon ………

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Maven

Maven Apache Maven, is an innovative software project management tool, provides new concept of a project object model (POM) file to manage project’s build, dependency and documentation. The most powerful feature is able to download the project dependency libraries automatically. Maven Local Repository is a local folder that is used to store all your project’s…

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How to create immutable class in Java?

How to create immutable class in Java? Immutable class is a class which once created, its contents cannot be modified. Immutable objects are the objects whose state cannot be modified once it is created. Best example to explain the difference between mutable and immutable is String and StringBuffer. String is immutable class (Refer String is…

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String is immutable or final in Java

String is immutable or final in Java? One of the Interviewers favourite question, How String plays an important role in every program, similarly in every interview questions on String will be there 🙂 😉 . Let’s check the reasons behind why String is immutable of final. Security: String is used in many places like in…

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String Pool

Almost in every program, String is being used. When we create a string, it is stored in String pool, as name indicates it is a pool of Strings stored in Java Heap Memory. We can create String in 2 ways By using new operator, String v1 = new String(“Test”); Directly assign the value using Double…

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Generics

Generics Java Generics features were introduced from Java Se 5 onwards. Before Java 5, we can store any type of objects in collection i.e. non generic. With inclusion of Generics we need to store only specific type of objects only. Let’s look at the benefits of generics Compile time checking: Generics allows you to check…

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Custom Annotation

Custom Annotation Similar to interface we can define Custom Annotations or user defined annotations simply by adding @interface in the declaration. For example: @interface CustomAnnotation{} Here, CustomAnnotationis the custom annotation name. While writing the custom annotations few points has to be considered. Method should not have any throws clauses, Similar to interface only declarations available…

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