包含标签：Java 的文章
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grails – java. Lang. illegalaccesserror: attempt to access class XYZ from class ZXY
I have a Grails application. If I start it through it, it works normally grails run-app In the early stage, I have dep…… -
Java – write lock to HashMap
I have an asynchronously updated HashMap I need to perform operations involving the map, which requires that the map d…… -
Java – NullPointerException when accessing array in class
I am new to this forum and Java The following code compiles, but when I try to enter a value for a variable, I get Nul…… -
Java – how many string objects are created for the following?
String summer = new String("Summer"); String summer = new String("Summer"); String summer2 = "Summer"; System.out.prin…… -
Java – spring MVC class suddenly cannot find dispatcherservlet
My webapp is running and everything is fine until I try to implement some fileUpload Feb 11,2014 4:11:35 PM org.apache…… -
Java – the best layout / nested layout for this structure
I'm new to swing. I'm trying to create an interface, such as: ——————————The text text of the information text 124124 1…… -
Java general Observer mode to achieve the original type is not selected.
I'm currently trying to take advantage of the general implementation of observer mode in Java. I find it seems to work…… -
Is it normal to put all Java Swing GUIs in one class?
I just started swing development and had problems Is it normal to put the whole GUI into a single class? The applicati…… -
Java – how to use selenium to record test cases in IE
I'm a beginner in selenium My application is only ie compatible I know that we can run test cases in any browser using…… -
Java – how to reverse a map
Let's look at a map: > A – > {1,2,3} > B – > {3,4,5} > C – > {2,3,5} I need to reverse this map and …… -
Java – jsonpath finds all objects (restassured)
This is my JSON: [ { "id": 9741962,"name": "getName","isActive": true },{ "id": 1,"name": "New","isActive": tr…… -
java. lang.NoSuchMethodError：org. apache. log4j. Logger
We use ivy to manage multi - Project Java applications, and recently this error began to appear when we built What cau…… -
An object can create multiple threads in Java
I am a novice in multithreading. I wrote the following code during practice I want to call the createthreaded method t…… -
Java – recursively sort ArrayLists into a tree
I have an ArrayList of objects But I need a tree with the following parameters: >Some objects should not have child…… -
Java – a data structure for saving the contents of the parsed CSV file
I'm trying to find the best way to parse CSV files in Java Now each line has x messages For example, the first line ca…… -
Java – public key encryption and private key encryption
I implemented asymmetric encryption in the project, using "public key" to "Encrypt" messages and "private key" to "dec…… -
Random int function behavior in Java
I have the following code: public class Main { private static final Random rnd = new Random(); private static int get…… -
Java – how to convert exchange attributes to uppercase in ‘simple’?
How do I convert attributes on Apache camel exchange to uppercase in the Apache camel expression language? for example…… -
Java do loop increment
int i = 10; int i = 10; int j = 0; do { j++; System.out.println("loop:" + j); while (i++ < 15) { …… -
Java – openshift Tomcat log: Catalina Out and localhost Out content
I have deployed my war application under the openshift tomcat7 cartridge In my application, I use log4j My log4j Prope…… -
The collection object cannot display the output of some undefined values in Java, ArrayList and collection
When I try to print a collection object, it prints employee @ 122392iie92 Why print this instead of the details of the…… -
Java – count (*) (asterisk) on querydsl / MySQL?
The initial function is MySQL query, which lists all providers of all tags: SELECT * FROM provider INNER JOIN provid…… -
Switch classes in Java?
I want to create a class for heap data structure in Java, allowing users to select minheap or maxheap @H_ 403_ 8@ The …… -
Java – special character encoding of errors using resteasy
I am using JBoss EAP 6.3 to develop a web application using resteasy rest framework. There is a bad coding problem wit…… -
Multithreading – Apache spark standalone mode: number of cores
I am trying to understand the basic knowledge inside spark and spark documents used to submit applications in local mo…… -
Java – how to crack this synchronization code?
I have the following code snippet synchronized (mObject) { if (mObject.variable != -1) { doThis(); …… -
Java – how to crack this synchronization code?
I have the following code snippet synchronized (mObject) { if (mObject.variable != -1) { doThis(); …… -
Java – how to change the chart generated by Apache POI to not use smooth lines and display empty cells as gaps?
I use poi 3.12-beta 1, and the code can create a line chart containing multiple data sets and named Series in the lege…… -
Java – implement a nondeterministic finite automata (NFA)
I am trying to develop a simulation of non - deterministic finite automata in Java The first command - line argument i…… -
Is it a Java RMI remote object (server) singleton?
I've been using Java RMI for some time, but I can't figure out whether RMI remote stubs (on the server side) is a sing…… -
java. sql. Sqlexception: user ‘admin’ login failed
Disclaimer: I have never used SQL server before I'm trying to connect to SQL Server Express using java code public cla…… -
Java – why does shadow affect ‘final’ behavior?
Here are three sscces. I think they should be compiled and behave the same The only thing I want to change is the firs……