JSP - The memory consumption

I'm not going to reiterate what most of the people already know about the difference between jsp include directive <%@ include... /> and jsp include action . One difference which struck to me and which, I want to share with you all is that action is good in terms of memory consumption. Before going into the details of what I've just mentioned, do remember that the jsp directive includes all the files at compile time, and when a request comes, the jsp (servlet) get's instantiated and is loaded into the heap memory. Similarly, for jsp action, the process happens at run time.

Now let’s take an example where, you have a member.jsp file. And you want to include another file permanentAddress.jsp, when permanentAddress flag is set to true. Similarly include memberDetails.jsp, when details flag is set to true, and planDetails.jsp, when plan flag is set to true.

In case of jsp directive, all the content of permanentAddress.jsp, memberDetails.jsp, and planDetails.jsp will get loaded into member.jsp at compile time and the entire jsp (servlet) will get instantiated and will use heap space accordingly. Then at run time it will execute the functions as per the checks (if statements).

In case of jsp action, if conditions will get evaluated first, and if it returns true, the if block will get executed and corresponding jsp will get included. As a result both the member.jsp and other jsp will get instantiated, and will use heap space accordingly. It won't use heap memory for all the jsps where if block is not getting executed and in a way it's saving some meomory on heap.

Not to mention that, jsp directive is faster to jsp action as it is including the content at compile time where as jsp action does it at run time.

 

Comments

  1. yakovgaeblerMarch 3, 2022 at 11:29 AM

    Lucky Eagle Casino and Hotel | Biloxi, MS - KTM
    LAS VEGAS 청주 출장마사지 (KPRC) -- Lucky Eagle Casino & 광주광역 출장마사지 Hotel is located just a short drive 김포 출장샵 from 청주 출장샵 Memphis International Airport. The casino and 경상남도 출장안마 hotel's 590

    ReplyDelete

Post a Comment

Popular posts from this blog

Spring Security - Adding more information to the authenticated user.

I was using spring Security to perform authentication against the database and I needed to load the user information once the user gets authenticated. However, the spring org.springframework.security.core.userdetails.User object was not allowing me add more details to the logged in User object. In my case, I had to add phone number to the authenticated user. In the following section I'll show as to how to add additional information to the authenticated user. Create an object to contain the additional information. We will first create a MediUser object which will extend the Spring org.springframework.security.core.userdetails.User object. The MediUser object contains additional information like first name, middle name, last name, phone number and alternative phone number. Following is the code for MediUser : import java.util.Collection; import org.springframework.security.core.GrantedAuthority; import org.springframework.security.core.
Read more

Hibernate Difference between update() and merge()

Image
In order to explain the difference between update and merge, I have created an example, which you can execute or just read it to understand the difference. 1. First Create a database medireports: (DB=MySQL) CREATE DATABASE `medireports` 2. Now Create a 'reports' table: CREATE TABLE `reports` ( `reportid` varchar(20) NOT NULL, `report` mediumblob, `phonenumber` bigint(20) NOT NULL, `labid` varchar(45) DEFAULT NULL, `retainreport` varchar(45) DEFAULT NULL, `reportdate` date DEFAULT NULL, `filename` varchar(65) DEFAULT NULL, PRIMARY KEY (`reportid`) ) 3. Insert data into the reports table: INSERT INTO `medireports`.`reports`(`reportid`,`phonenumber`,`retainreport`,`reportdate`,`filename`) VALUES ('ZL1234', '9999666222', '0', '2014-03-13', 'jqModal.js'); INSERT INTO `medireports`.`reports`(`reportid`,`phonenumber`,`retainreport`,`reportdate`,`filename`) VALUES ('ZL123456&
Read more

Running tomcat maven plugin in Debug mode (in STS, Eclipse and MyEclipse)

Image
Over here I'll explain, as to how to run a tomcat maven plugin in debug mode, in Eclipse and Spring Tool Source (STS). It will be a three step setup and once you are done with the setup, you can run the tomcat server in debug mode with just one click. Following are the setup steps: Step 1 : Entering maven dependency for tomcat in pom.xml file Step 2 : Creating debug configuration Step 3 : Running tomcat server in debug mode Step 1: Entering maven dependency for tomcat in pom.xml file Open your pom.xml file. Enter the tomcat plugin dependency, as shown in the following figure: Now right click on the pom.xml and select Run As à Maven Install . Step 2 :  Creating Debug Configuration Right click on pom.xml and select Debug As à Debug Configurations… A Debug Configurations window will open, as shown in the following figure: On the left hand window right click on Maven Build , as a result, following screen will get displayed:
Read more