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1, business log related If the system is abnormal or the business is abnormal, the first thought is to view the business log To View the log tool: Less or more Grep tail-f filename to see what's new in real time PS: Avoid vim directly open large log file, because will be loaded directly into the memory of the Java application of many bottlenecks in the database, a SQL is not written to cause slow query, may bring the application of fatal harm. If th

use of change, keep editing records, any restore history template) Online Code Editor, imitation developer tool Editor, with line number, color distinction, code foldingBackground Section Introduction 8. code Generation : Generate complete module code, and keep the generated record template, reusable ( Super strong development tool ) forward generation: Generate complete modules, pages, processing classes, service tiers, SQL scripts for myabaits XM

First, for many Java Web beginners difficult to get started, the author uses a small Web project, a step-by-step demonstration of the Java Web development approach, each chapter introduces some key knowledge of Java Web development, so that students can be Java Web Development knowledge points in series together, Learn

Common online documents for Java developers Document Name Version J2se API docs 1.3.1 1.4.2 1.5 Jdk sdk docs 1.3.1 1.4.2 1.5 The J2EE 1.4 tutorial 1.4 The javatm tutorial Javatm tutorial)

527814231, fault phenomenonCustomer Service colleague Feedback platform system runs slowly, the webpage is serious, the problem persists after restarting the system several times, using the top command to view the server situation, found that the CPU occupancy rate is too high.2, high CPU consumption problem location 2.1, positioning problem processUse the top command to view resource usage, and find that the PID 14063 process consumes a lot of CPU resources, CPU usage is up to 776.1%, and memor

pk1936-three-terminal separation Java SSM rapid development of online education platform of imitation mu-netThe beginning of the new year, learning to be early, drip records, learning is progress!Essay background: In a lot of times, many of the early friends will ask me: I am from other languages transferred to the development of the program, there are some basic information to learn from us, your frame fee

operations, the first set-up, that is, the so-called Tombstone , and the addition of the node to echo, after the mark is over, after the second CAs execution, the addition to this node is unsuccessfulThis CAS failure indicates that there are additional threads to delete operations or CAS before there are add operations to Cur's next (succ change), which returns to try againThe second time the original point to cur pred.next point to succ, physical deletion , where SUCC has not changed, because

42 21.917 219 1496.567 1518.484 0.00 0.00 100.00 99.99 26.31 42 21.917 220 1505.439 1527.355 0.00 0.00 100.00 99.99 26.31 42 21.917 220 1505.439 1527.355 0.00 0.00 100.00 99.99 26.31 42 21.917 220 1505.439 1527.355From the output information, it can be seen that the Eden area memory occupies the 100%,old area memory occupies 99.99%,full GC up to 220 times, and the frequent full Gc,full GC duration is also particularly long, the average time spent 6

Sometimes ourProgramYou need to connect to the server to detect the new version. If you find the new version, you need to automatically download and upgrade it. But in windows, how can I replace a running program file?Of course there is a way, the steps are as follows: 1. Package and release our program using Java program proxy (here we need to use its advanced version instead of the free version, click to

Java + FlexPaper + swfTools Online Preview demo, flexpaperswftools 1. Overview Principle 1. Use a third-party openoffice tool to convert files such as word, excel, ppt, and txt to PDF files. 2. Use swfTools to Convert PDF files into swf files 3. Use the FlexPaper document component to display on the page 2.Download the installation package 1. openoffice is an open and f