destroy() gets executed and the initialization process continues. Servlet will not be destroyed.
For more Info check out below link :
What happens if you call destroy() from init() in java servlet?
Where do I start?
I’m a huge financial nerd, and have spent an embarrassing amount of time talking to people about their money habits.
Here are the biggest mistakes people are making and how to fix them:
Not having a separate high interest savings account
Having a separate account allows you to see the results of all your hard work and keep your money separate so you're less tempted to spend it.
Plus with rates above 5.00%, the interest you can earn compared to most banks really adds up.
Here is a list of the top savings accounts available today. Deposit $5 before moving on because this is one of th
Where do I start?
I’m a huge financial nerd, and have spent an embarrassing amount of time talking to people about their money habits.
Here are the biggest mistakes people are making and how to fix them:
Not having a separate high interest savings account
Having a separate account allows you to see the results of all your hard work and keep your money separate so you're less tempted to spend it.
Plus with rates above 5.00%, the interest you can earn compared to most banks really adds up.
Here is a list of the top savings accounts available today. Deposit $5 before moving on because this is one of the biggest mistakes and easiest ones to fix.
Overpaying on car insurance
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Pull up Coverage.com, a free site that will compare prices for you, answer the questions on the page, and it will show you how much you could be saving.
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If you’ve got $10K+ in debt (credit cards…medical bills…anything really) you could use a debt relief program and potentially reduce by over 20%.
Here’s how to see if you qualify:
Head over to this Debt Relief comparison website here, then simply answer the questions to see if you qualify.
It’s as simple as that. You’ll likely end up paying less than you owed before and you could be debt free in as little as 2 years.
Missing out on free money to invest
It’s no secret that millionaires love investing, but for the rest of us, it can seem out of reach.
Times have changed. There are a number of investing platforms that will give you a bonus to open an account and get started. All you have to do is open the account and invest at least $25, and you could get up to $1000 in bonus.
Pretty sweet deal right? Here is a link to some of the best options.
Having bad credit
A low credit score can come back to bite you in so many ways in the future.
From that next rental application to getting approved for any type of loan or credit card, if you have a bad history with credit, the good news is you can fix it.
Head over to BankRate.com and answer a few questions to see if you qualify. It only takes a few minutes and could save you from a major upset down the line.
How to get started
Hope this helps! Here are the links to get started:
Have a separate savings account
Stop overpaying for car insurance
Finally get out of debt
Start investing with a free bonus
Fix your credit
Hiii friends,
Before knowing servlet container you have to know about web container .
So i am going to demonstrate you all this :-
1. What is a Web Server?
To know what is a Servlet container, we need to know what is a Web Server first
A web server uses HTTP protocol to transfer data.So what the server does is sending a web page to the client. The transformation is in HTTP protocol which specifies the format of request and response message.
2. What is a Servlet Container?
As we see here, the user/client can only request static webpage from the server. This is not good enough, if the user wants to rea
Hiii friends,
Before knowing servlet container you have to know about web container .
So i am going to demonstrate you all this :-
1. What is a Web Server?
To know what is a Servlet container, we need to know what is a Web Server first
A web server uses HTTP protocol to transfer data.So what the server does is sending a web page to the client. The transformation is in HTTP protocol which specifies the format of request and response message.
2. What is a Servlet Container?
As we see here, the user/client can only request static webpage from the server. This is not good enough, if the user wants to read the web page based on his input. The basic idea of Servlet container is using Java to dynamically generate the web page on the server side. So servlet container is essentially a part of a web server that interacts with the servlets.
Servlet container is the container for Servlets.
3. What is a Servlet?
Servlet is an interface defined in javax.servlet package. It declares three essential methods for the life cycle of a servlet – init(), service(), and destroy(). They are implemented by every servlet(defined in SDK or self-defined) and are invoked at specific times by the server.
- The init() method is invoked during initialization stage of the servlet life cycle. It is passed an object implementing the javax.servlet.ServletConfig interface, which allows the servlet to access initialization parameters from the web application.
- The service() method is invoked upon each request after its initialization. Each request is serviced in its own separate thread. The web container calls the service() method of the servlet for every request. The service() method determines the kind of request being made and dispatches it to an appropriate method to handle the request.
- The destroy() method is invoked when the servlet object should be destroyed. It releases the resources being held.
From the life cycle of a servlet object, we can see that servlet classes are loaded to container by class loader dynamically. Each request is in its own thread, and a servlet object can serve multiple threads at the same time(thread not safe). When it is no longer being used, it should be garbage collected by JVM.
Like any Java program, the servlet runs within a JVM. To handle the complexity of HTTP requests, the servlet container comes in. The servlet container is responsible for servlets’ creation, execution and destruction.
4. How Servlet container and web server process a request?
- Web server receives HTTP request
- Web server forwards the request to servlet container
- The servlet is dynamically retrieved and loaded into the address space of the container, if it is not in the container.
- The container invokes the init() method of the servlet for initialization(invoked once when the servlet is loaded first time)
- The container invokes the service() method of the servlet to process the HTTP request, i.e., read data in the request and formulate a response. The servlet remains in the container’s address space and can process other HTTP requests.
- Web server return the dynamically generated results to the correct location
The six steps are marked on the following diagram:
5. The role of JVM
Using servlets allows the JVM to handle each request within a separate Java thread, and this is one of the key advantage of Servlet container. Each servlet is a Java class with special elements responding to HTTP requests. The main function of Servlet contain is to forward requests to correct servlet for processing, and return the dynamically generated results to the correct location after the JVM has processed them. In most cases servlet container runs in a single JVM, but there are solutions when container need multiple JVMs
Thanks
I think have also covered all the related topics.
For Example User Click on Logout Link To Perform Below Codes. See I apply comments how to destroy session object please read comments.
<a href="<%=request.getContextPath()%>/LogoutServlet">Logout</a>
Look LogoutServlet.java file
LogoutServet.java
public class LogoutServlet extends HttpServlet
{
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
HttpSession session = request.getSession(false); //getting to session object
if(session!=null) // check if condition the session not null
{
session.invalidate(); //using this method to destroy the
For Example User Click on Logout Link To Perform Below Codes. See I apply comments how to destroy session object please read comments.
<a href="<%=request.getContextPath()%>/LogoutServlet">Logout</a>
Look LogoutServlet.java file
LogoutServet.java
public class LogoutServlet extends HttpServlet
{
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
HttpSession session = request.getSession(false); //getting to session object
if(session!=null) // check if condition the session not null
{
session.invalidate(); //using this method to destroy the sesion object
request.setAttribute("errorMS", "Logged out successfully"); //send "errorMSG" object on client side. And get using request.getAttribute() method
RequestDispatcher requestDispatcher = request.getRequestDispatcher("login.jsp"); // using RequestDispatcher method forward to login page.
requestDispatcher.forward(request, response);
System.out.println("you can logged out successfully");
}
}
}
Let me describe you with clear cut picture. with details of servlet life cycle.
- Servlet container have the full responsible for creating and destroying servlet class object.
- Servlet life cycle have 3 method init(servletconfig), service(-,-), and destroy()
One misconception : everyone think that destroy ( ) method destroys the servlet class object, But this is totaly wrong.
Destroy method does not destroy our servlet class object , Servlet container takes the responsibility to create and destroy the srervelet class object,
Destroy method is called for cleanup operation like closing the jdbc con
Let me describe you with clear cut picture. with details of servlet life cycle.
- Servlet container have the full responsible for creating and destroying servlet class object.
- Servlet life cycle have 3 method init(servletconfig), service(-,-), and destroy()
One misconception : everyone think that destroy ( ) method destroys the servlet class object, But this is totaly wrong.
Destroy method does not destroy our servlet class object , Servlet container takes the responsibility to create and destroy the srervelet class object,
Destroy method is called for cleanup operation like closing the jdbc connection just before the servlet object going to destroy. Destroy method is one time executing life cycle method.
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Here’s the thing: I wish I had known these money secrets sooner. They’ve helped so many people save hundreds, secure their family’s future, and grow their bank accounts—myself included.
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Let's start from the beginning step wise
Step 1.declaration
x and y are declared as floating point numbers which mean 5 and 9 are considered as 5.00 nd 9.00
Step 2.declaration And assignment
z is decleared as an integer which means it cannot store floating point nos. Or simply numbers after the decimal point are ignored
In the above case external typecasting is done which is required when we want to convert a higher data type to a lower data type.
When x/y is done it produces a float number as output but to store this output into an integer typecasting is required where x/y=1.8 here is converted to
Let's start from the beginning step wise
Step 1.declaration
x and y are declared as floating point numbers which mean 5 and 9 are considered as 5.00 nd 9.00
Step 2.declaration And assignment
z is decleared as an integer which means it cannot store floating point nos. Or simply numbers after the decimal point are ignored
In the above case external typecasting is done which is required when we want to convert a higher data type to a lower data type.
When x/y is done it produces a float number as output but to store this output into an integer typecasting is required where x/y=1.8 here is converted to an integer and just 1 is stored
So now z=1
Step 3.executing the switch case
z is passed as a parameter so case 1 is executed.
Case 1 performs the following operation i.e x=x+2
So now value of x is 11 or x=11.0
Step 4.output is 11.0
Now dr is no break statement so the control goes to the next case statment
Step 5.case 2 is executed
X=x+3
Now x=14.0
Step 5.default is executed also
X=x+1
Now x=15.0
Languages like C,C++ and java supports the concept of fall through which means if you do not mention a break statement the case is executed and all the cases and default after that is executed too…
Thanx Varishta Das for pointing out the mistake
Thanx Ekesh Bahuguna for correction
The init method is a life cycle callback method of the Servlet class, it is called by the servlet container to initialize the servlet instance. After initialization the servlet instance is in the ready state, it is placed into service (the service method is invoked with each matching request).
The init method is called only once after the servlet class is loaded by the Java class loader, after a servlet instance is created in the servlet container and before the servlet class is used (service, doGet, doPost… methods are called)!
It is possible and a typical practice to override the init method i
The init method is a life cycle callback method of the Servlet class, it is called by the servlet container to initialize the servlet instance. After initialization the servlet instance is in the ready state, it is placed into service (the service method is invoked with each matching request).
The init method is called only once after the servlet class is loaded by the Java class loader, after a servlet instance is created in the servlet container and before the servlet class is used (service, doGet, doPost… methods are called)!
It is possible and a typical practice to override the init method in the Servlet implementation class. With the init method the ServletConfig object is available in the servlet instance, so that the servlet configuration parameter values can be read and used in the servlet implementation.
The init method actually does very little. According to Servlets Life Cycle, the init method:
“is designed to be called only once. It is called when the servlet is first created, and not called again for each user request. So, it is used for one-time initializations, just as with the init method of applets.
The servlet is normally created when a user first invokes a URL corresponding to the servlet, but you can also specify that the servlet be loaded when the server is first started.
When a user invokes a servlet, a single instance of each servlet gets created, with each user request resulting in
The init method actually does very little. According to Servlets Life Cycle, the init method:
“is designed to be called only once. It is called when the servlet is first created, and not called again for each user request. So, it is used for one-time initializations, just as with the init method of applets.
The servlet is normally created when a user first invokes a URL corresponding to the servlet, but you can also specify that the servlet be loaded when the server is first started.
When a user invokes a servlet, a single instance of each servlet gets created, with each user request resulting in a new thread that is handed off to doGet or doPost as appropriate. The init() method simply creates or loads some data that will be used throughout the life of the servlet.”
I’m assuming that you have written above code in main().
The output will be 15.0;
There is no break statement, so all case statement will be executed.
float x=9;
float y=5;
int z= (int)(x/y); // Z = 1
switch(z)
{
case 1: x=x+2; // x= 11.0
case 2: x=x+3; // x= 14.0
default: x=x+1; // x= 15.0 It will be output
}
System.out.println(x); // output x = 15.0
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What is Freecash all about?
Basically, it’s a platform that pays you for testing apps and games and completing surveys. This helps developers improve their appl
Like many of you reading this, I’ve been looking for ways to earn money online in addition to my part-time job. But you know how it is – the internet is full of scams and shady-grady stuff, so I spent weeks trying to find something legit. And I finally did!
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What is Freecash all about?
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to send your messages. the messages like HTML format.
the response work order on HttpServletRequest request and HttpServletResponse response object.
Note : - request and response are object of Http Services.
This will largely depend on the implementation of the servlet container. It will be called whenever the servlet container deallocates the servlet instance. The servlet spec does not specify when this should happen. The servlet instance may be active for the entire duration that the servlet container is up, or it may deallocate instances earlier for performance purposes
It is more like Garbage Collection activity if you can have an analogy. This method will be called when the Servlet Container puts the Servlet Instance out of memory once its life time is over. It is purely dependent on the Servlet Vendor with their implementation. As a programmer you be rest assured that whenever a Servlet instance needs to be taken off the memory ( be it during container shut down or the instance going away), this method will be called.
Lets move step-by-step in order to find the output of the your code :
float x=9; → float variable x is assigned value as: 9.0
float y=5; → float y is assigned value as: 5.0
int z = (int)(x/y); → first computes (9/5) i.e 1.8 and the result is converted into integer type i.e 1.
switch(z) →takes the above computed value i.e 1
{
case 1: x=x+2; → as it verifies the case condition, this would be ‘true’, giving value of x=9.0+2 = 11.0
case 2: x=x+3; → since there is no break statement encountered, the execution moves to this case as well, giving value of x=11.0+3 = 14.0
default: x=x+1; → again no break sta
Lets move step-by-step in order to find the output of the your code :
float x=9; → float variable x is assigned value as: 9.0
float y=5; → float y is assigned value as: 5.0
int z = (int)(x/y); → first computes (9/5) i.e 1.8 and the result is converted into integer type i.e 1.
switch(z) →takes the above computed value i.e 1
{
case 1: x=x+2; → as it verifies the case condition, this would be ‘true’, giving value of x=9.0+2 = 11.0
case 2: x=x+3; → since there is no break statement encountered, the execution moves to this case as well, giving value of x=11.0+3 = 14.0
default: x=x+1; → again no break statement encountered, the execution moves to this step, giving value of x=14.0+1 = 15.0
}
System.out.println(x); → prints 15.0 as output.
Hope this explains you the output and the reason for “WHY?” !! :)
Feel free to ask for any doubts.
You can use it to initialiaze anything as u wish. Servlet container will ensure that it calls init method when the container starts . That's all about it.