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Overview of Java class loaders and class loading process

1. The class loading process loads the fully qualified name of the class (package name + class name), obtains the .class file of the class, and loads it into the metaspace. Link verification: Verify the security of the .class file. Preparation: Allocate memory for static type variables and set default values. Resolution: Convert symbol references in the constant pool into direct references. The symbol references point to an unloaded class, or an unloaded class. field or method, then the parsing will trigger the process of loading, initializing and executing the constructor method init() of the class. If the class has a parent class, jvm will ensure that the init of the parent class is executed first, and then the init of the subclass is executed. . 2. Class loader startup class loader startup class loader is implemented in C/C++ language and is used to load Java core classes

Apr 24, 2023 am 10:13 AM

Java

How to use and implement Java multithreading

1. Application scenarios (1) Ordinary browsers and network services (the network now written is an intermediate component that helps you complete thread control), network processing requests, various dedicated servers (such as game servers) (2) servlet multi-threading. (3) FTP download, multi-threaded file operation. (4) Multi-threading used in the database. (5) Tomcat and tomcat use multi-threading internally. Hundreds of clients access the same WEB application. After tomcat accesses, the subsequent processing is put into a new thread for processing. The new thread finally calls our servlet program (6) Background Tasks: For example, regularly send emails to a large number of users (more than 1 million); regularly update configuration files and task scheduling (such as quart

Apr 23, 2023 pm 05:04 PM

Java

How to deploy java project in pagoda panel

1. Install the Java project manager. In the software store of the Pagoda panel, we enter "Java". Note that the first letter must be capitalized. 2. Click "Install" in the operation, and then click the "OK" button. The installation process is very fast. After the installation is successful, let the home page display. 3. Click the setting operation and install tomat8 in the version management in the Java Project Manager. After "Installation Complete", at the same time, in the tomcat version drop-down box, tomcat8 is also displayed as installed. 4. In the project management of the Java Project Manager, click "Add Project". The domain name has been resolved in advance. Select the tomcat version. After filling in the project domain name, click the "OK" button. 5. After adding the project, proceed with the operation

Apr 20, 2023 pm 03:10 PM

Java

How to use Java IO stream and network to make a simple image crawler

Simple Application of JavaIO Streaming and Network Recently I saw the usage of URL class and simply made a Java version of the crawler. I found it quite interesting, so I shared it. Crawling Baidu pictures through keywords is the same as using a search engine to search for Baidu pictures, except that you can learn the use of technology through crawlers. (This program is only for learning and use, no other use!) JavaIO stream and URL class JavaIO stream Java's IO stream is the basis for realizing input/output. It can conveniently realize data input/output operations. In Java, Different input/output sources (keyboard, files, network connections, etc.) are abstractly expressed as "stream", and Java is run through the stream method.

Apr 20, 2023 pm 12:49 PM

Java io

How to access services in docker from the external network

With the popularity and development of container technology, Docker has become a leader in containerization technology and an indispensable tool for many developers and operation and maintenance personnel. In practical applications, we often need to expose the services in Docker to the external network for access. In this case, we need to use Docker's network configuration and port mapping. 1. Docker network configuration There are four types of Docker networks: bridge network, host network, none network and custom network. When using Docker for service development

Apr 19, 2023 pm 02:12 PM

How to view tomcat logs with docker

How Docker Views Tomcat Logs When running Tomcat in a Docker container, it is very important to view the log files generated by the application. When using Tomcat, the generated logs are usually located in the Tomcat log directory, and Tomcat in the Docker container also has its own log directory. This article will introduce how to view Tomcat logs in a Docker container. Step 1: Enter the Docker container. First, we need to use the following command to enter the Docker container: ```dock

Apr 19, 2023 am 09:16 AM

what is linux middleware

In Linux, middleware is an independent system software or service program that allows communication between multiple applications and a database. Its main function is to abstract multiple applications or databases into a whole to simplify Development and maintenance of system applications, such as database connection management, network storage management, network communication management, etc. Middleware is widely used in Linux systems, such as Apache, Tomcat, etc. on the server side; MPlayer, Exaile, Amarok, etc. on the client side.

Apr 18, 2023 am 11:27 AM

linux

How to start tomcat in docker

Docker is a lightweight virtualization technology that can isolate one or more applications or services. Among them, Docker containers are widely used to develop, test, deliver and deploy applications. Tomcat is a common Java web server that can run in a Docker container. This article will introduce how to start Tomcat in Docker. 1. Download the Tomcat image Docker image. The Docker image is a read-only template that contains

Apr 18, 2023 am 10:20 AM

How to integrate Axis1.4 in java projects

1. Server (project name: server) 1.1. Axis1.4 environment construction 1) Download the axis1.4 file [click to download], copy all jar packages of axis-1_4\lib to server\WebRoot\WEB-INF\lib2) Add server- under server\WebRoot\WEB-INF The content of the config.wsdd file is as follows 3) Add the content to server\WebRoot\WEB-INF\web.xml: index.jspAxisServletorg.apache.axis.transport.http.AxisServlet

Apr 17, 2023 pm 08:07 PM

Java axis

How does nodejs request tomcat

Node.js and Tomcat are two different servers, suitable for front-end and back-end development respectively. Front-end developers often use Node.js to build applications and websites, and back-end developers often use Tomcat to build Java web applications. There is no direct connection between the two servers, so some special setup is required when requesting Tomcat via Node.js. First, to request Tomcat using Node.js, you need to use ht

Apr 17, 2023 pm 03:00 PM

What is the most commonly used technology stack for Java?

Commonly used technology stacks in Java include: 1. JDK; 2. Web framework; 3. Web container; 4. ORM framework; 5. Spring; 6. Database; 7. Search engine; 8. Back-end template engine; 9. Workflow ; 10. Other language middleware, such as Kafka, RocketMQ or RabbitMQ, etc. Inventory of commonly used technology stacks for Java development 1. Introduction Recently, many people have privately asked me about the commonly used Java development technology stacks, so today I will summarize a wave of commonly used Java technology stacks. 2. Most of the JDK versions of JDK have been moved to 8. Those who use 11 are ahead of the curve. Please look for the LTS version! No

Apr 14, 2023 pm 09:43 PM

Java

How to use projects downloaded from gitee

If you are a programmer or like open source projects, I believe you have heard of gitee, a project hosting platform, where you can find many open source projects you need. However, for many people, how to use these open source projects after downloading them is a problem. This article will introduce how to use the projects downloaded from gitee. First of all, we need to make it clear that the projects downloaded from gitee refer more to open source source code. If you need to use these codes for development, you need to compile, package and other operations. Below we take the Java project as an example

Apr 11, 2023 am 09:07 AM

How to use docker on ecs (tutorial)

How to use Docker on ECS Tutorial Background With the development of cloud computing technology, cloud servers (ECS) have become an indispensable part of Internet enterprise operation and maintenance. As a fast and convenient containerization technology, Docker has gradually become a popular choice for enterprise development and operation and maintenance. This article will introduce how to use Docker on Alibaba Cloud ECS. 1. Purchase ECS First, you need to purchase an ECS instance in the Alibaba Cloud console. You need to select an operating system when purchasing. It is recommended to choose CentOS here.

Apr 10, 2023 pm 02:18 PM

What should I do if github does not display the newly added jsp files?

GitHub is a popular code hosting platform. Developers can use the platform's version control function to manage code, collaborate on writing documents and code, etc. However, some developers found that when submitting jsp files, the newly added jsp files were not displayed on GitHub. This is because jsp files are generally compiled before they can be run on the server, and Git only recognizes text files. Therefore, when submitting a jsp file, specific operations must be taken to correctly display the jsp file on GitHub. 1. Use .gitignore

Apr 10, 2023 am 09:41 AM