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Solve org hibernate. HibernateException: identifier of an instance of com. ahd. entity. Order was altered from2 to 0
error message Causes: 1. eg. The type of ID in the mapping file is integer, that is, int, while the type o…… -
Java_ Properties
Java_ Properties class Differences between hashtable and HashMap HashMap thread is unsafe, asynchronous and efficient …… -
struts2_ Struts 2 basic configuration
Basic configuration 1. Create a new web project 2. Import the jar package. Download the jar package required by stru…… -
JSTL_ Core tag library
I explain 2： Core tag library The core tag library provides the general functions required for JSP page programming. …… -
struts2_ Is struts 2 thread safe?
Thread safety: multiple threads execute concurrently in a process. During thread execution, the variable values are th…… -
Java_ Bubble sorting_ Principle and optimization
Bubble sorting and its optimization I Principle and optimization principle 1. Principle explanation Bubble sorting…… -
struts2_ HelloWorld
First struts 2 program - Hello 1. Create web project struts2-01-hello 2. Import the jar package into the bin d…… -
Java_ IO stream_ abstract class
< p align = "left" > I concept III Character stream and byte stream and file 1. Byte stream Input stream Out…… -
JSTL_ XML tag library
JSTL_ XML 1： Explain 2： XML tag library The main function of XML tag library is to provide convenient support for op…… -
Java connection to MySQL database
Several methods of Java connecting to database *Explain 1. Take MySQL database as an example 2. There are fo…… -
struts2_ struts. Explanation of XML configuration file
1.bean Bean detailed explanation: https://www.cnblogs.com/lulu638/p/4340703.html 2.constant Constant attribute configu…… -
Java_ Queue interface
Queue interface 1. english A) queue B) deque, double Ender queue 2. Queue interface In addition to the basic c…… -
struts2_ Struts type conversion
I In the servlet, the non string type submitted by the form needs to be converted manually 1. In struts, the commo…… -
Java Web Series: JAAS authentication and authorization Foundation
1. Overview of certification and authorization (1) Authentication: authenticates the user's identity. . Net based RBS …… -
Java Web Series: JDBC Foundation
ADO. Net in Java is the enterprise library dataaccessapplicationblock module, the module in Java, and the orm of entit…… -
Basic use of Java enumeration classes
Enum type is a new feature in Java 5. It is a new type that allows constants to represent specific data fragments, and…… -
Java Web Series: Fundamentals of Java Web projects
1. Java web module structure JSP files are similar to axpx files. Paths and URLs correspond to each other one by one a…… -
JAVA Chinese garbled code
1. In MyEclipse, you can set the file encoding format, but when we use scanner to type, because Windows uses GBK encod…… -
Detailed summary of transaction in Java
< H4 id = "1 what is a Java transaction" > < span style = "color: #3366ff;" > 1. What is a Java transactio…… -
Hibernate reverse engineering principle_ Java version
In a "" article earlier, a friend asked this question: Source address: I have nothing to do these days. I thought abou…… -
Output stars (*) according to the number of layers of stars_ Java version
I looked at it myself and thought it was fun, so I wrote one myself -
Java development_ Quick search for local files_ Applet
This is an application running effect Then I had a whim. I had an application called: Why not modify its source code a…… -
Maven study notes
Study notes Select apache-maven-3.3 9-bin. Zip download and unzip. Configure environment variable: create a new enviro…… -
Common resource arrangement based on Java platform
Here is a collection of tools for building applications: Maven uses declarations to build and manage dependencies, pre…… -
Java programming_ socket_ Socket_ Network programming
For the server, use ServerSocket to listen to the specified port. The port can be specified at will (since ports below…… -
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java_ Free blocks (static and non static blocks)
There are two types of free blocks in Java: Static and non static blocks Static block: Non static block: Test Demo: Co…… -
Rookie growth
I suddenly found that yesterday (20-03-2016) was the fifth anniversary of my entering the circle. The time suddenly re…… -
Java Web Development_ Realization of shopping cart function
I haven't touched the shopping cart before, and I don't know what to do with the shopping cart, so I queried a lot of …… -
Hibernate learning notes
< p class = "L" > transferred from < a style = "font size: 14px;" href="%20http://blog.csdn.net/jiuqiyuliang/……