java debugging questions

line of code in the program or you write an assignment statement to change the value of variables and so on.9. Remote DebugRemote debug can be used to debug the remote server code, to ensure that your local code and remote deployment of code is consistent, you can debug the server code in this way, this is a great tool for Java Web development, or location server problem is simply a disaster.Remote Debug requires server-side startup JVM to do some op

Tomcat uses myeclipse remote debugging Java code to summarize the following:When you do remote debugging, the configuration under Windows and non-Windows systems is different in Tomcat, as follows: The first step, configure TomcatOne, in the Windows system:Open the file Catalina.bat under%cataline_home%/bin, and add the following line:Set Catalina_opts=-server-xd

Is it difficult or difficult to interview? It depends on the interviewer's background (gas field + skills), mentality and cognitive and communication skills. Interview can be understood as a chat and negotiation, in the process of psychological, ideological collision and game. In fact, you just need to figure out a logic: "Why does the interviewer ask?" What answer does he want to hear? "Then the targeted preparation and answer on the line, without him."Whether you are a new programmer or a vete

I. Linux tomcat configuration and startup1.catalina.sh the first line to addDeclare-x catalina_opts= "-xdebug-xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000"2. Start Jpda (This is the boot mode under Tomcat, other servers may be different, but the same is true)./catalina.sh JPDA Start3. Start the Web service./start.shTwo. In the Windows side of the MyEclipse in accordance with the configuration of Ip,port, etc.,Then select source in the diagram, select the code directory you want t

First, let's talk about the differences between final, finally, and finalize.　　Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )?　　Third, the difference between static nested class and inner class is that the more you say, the better (the more general the interview questions are ).　　Fourth, the difference between and.　　Fifth, the difference between has

(); } }Whether a return statement can be written in a 9.finally code blockYes, I can.10. Why Java programmers often silently ignore the handling of exceptionsThe following code snippet often appears in the program, and if exception handling is so important, why are so many developers doing it all the time? Try { ... Catch (Exception e) { e.printstacktrace (); }The code that often appears does not

This article describes how to debug Java Card applets in a simulation environment.Start the Jcop debugger by simulating debugging in eclipse with Jcop. We can see for example by:To simulate debugging, is to enter JCOP-related instructions in the command input box, by reading the JCOP help document, we see that JCOP provides a variety of commands, about 40.Here ar

Atitit. Design and implementation of breakpoint single-step debugging in scripting language attialx summary php references java1. Breakpoint Implementation: Manual breakpoint Die and exit are equivalent 12. The implementation of the variable table 13. Print_r ($vars _list); 14. Both Print_r and var_dump can output arrays and objects. 15. References 21. Implementation of breakpoints: manual breakpointsDie and exit are equivalent.2. Implementation of v

format. You can also customize the format, you need to extend the Formater class and overwrite the following method string format (LogRecord record) 5.8 logging description 1 for a simple application, select a logger, and name the logger the same as the application package. 2 The default log configuration logs all messages with levels equal to or above the info level to the console. Users can override the default configuration file. Messages with 3 levels of info, waring, severe are displayed

Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a

Logical Thinking interview questions-java backend interview-,-java backend(-1) Preface I recently participated in an interview and was very interested in the pen questions. I will return to Baidu. Thinking about these questions reminds me of the association in modeling. I fe

Here are some popular interview questions about Java threading, which you can use to prepare for the interview.1) What is a thread?A thread is the smallest unit that the operating system can perform operations on, which is included in the process and is the actual operating unit of the process. Programmers can use it for multiprocessor programming, and you can speed up operations-intensive tasks using multi

Simple Java: Nine Frequently Asked Questions about Java Maps, simplemaps In general, Map is a data structure composed of key-value pairs. The key cannot be repeated in Map; This article summarizes the nine most common problems (about Java Map and Its Implementation classes ); For the sake of simplicity, I will not use

Java Web Remote DebuggingTomcat Download Compressed Edition ServerEnvironment: Tomcat, Eclipse, remote debugging We don't need other special plugins.1, Configuration Tomcat/bin/startup.batAdd code in front: SET catalina_opts=-server-xdebug-xnoagent-djava.compiler=none-xrunjdwp:transport=dt_socket,server =y,suspend=n,address=80008000 is the port we are debugging r

variable, we can conveniently add it through Edit configuratio N dialog box.Back to top of 8. Drop to FrameThe second best feature I love. We can just return the control to any frame in the call stack during debug. Changes made to variables won't be reset. Choose the stack level which your want to go back and restart debug from there and click the drop to frame button from Debu G toolbar. Eclipse is cool!Back to top of 9. Step FilterWhen we are Step into (F5) a method we may go to external libr

The Java Platform Debugger architecture (Jpda:java Platform Debugging Architecture) consists of a Java virtual machine back-end and debug platform front-end tomcat can be debugged remotely through JPDA. Can be modified Startup.bat (Linux under the startup.sh) or to change the Catalia.bat (Linux under the catalia.sh) to achieve; Do not change the file for remote

Project to the Linux server, the server environment or data may be different from our local, this time we may need a remote breakpoint to debug, to see the value of each variable in the request process. Here our application server uses the tomcat5.5.17This time you need to know the concept of JPDA.Simply summarize the following JPDA:The Java Platform Debugger Architecture (Jpda:java Platform Debug architecture) consists of a

After JDK5, Java provides a more convenient security mechanism that uses lock locks for thread-locked operations and release operations without using synchronized . More clear. Example:Lock lock=new Reentrantlock ();Lock.lockCode that needs to be lockedLock.unlockWhy is lock more secure? Because synchronized may cause deadlock phenomenon, specifically about the deadlock phenomenon can refer to the operating system, there is no more to say.Summarize th

Atitit. Design and implementation of breakpoint single step debugging in scripting language attialx summary php reference java1. Breakpoint Implementation: Manual breakpoint Die and exit are equivalent 12. The implementation of the variable table 13. Print_r ($vars _list); 14. Both Print_r and var_dump can output arrays and objects, 15. Reference 21. Implementation of breakpoints: manual breakpointsDie and exit are equivalent.2. Implementation of var

the element you want to find. Take a look at the following animated demo Method Three: Mouse over the UI element you want, click the right mouse button, select the Inspect Element menu command We can also use Chrome to get the XPath of the element directly. Internet Explorer or Edge Microsoft's own browser also comes with "developer tools," Using the Tools menu or F12 to launch Firefox's Firebug Plugin Firefox is the best browser supported by selenium and recommends installing Fir