Java
-
Java – system. Java in Servlet exit
If someone writes system. In the servlet Exit(), will the server or application crash? Solution Maybe! The container s…… -
Java – how to add Weblogic – application. Net to the war file xml
Can you tell me if I can add Weblogic - application. To the war file XML, if so, how to perform the same operation Sol…… -
Python regular expression for java package name
I have a problem using Python to determine a valid java package name This is the code: packageName = "com.domain.lala"…… -
Java – I encountered this exception: an unresolved compilation problem
I removed the jar from the project（ pdf@R_157_2419 @, bouncy castle, etc.) and move them to another folder, but I get…… -
JavaFX 2.0 activates menus, such as MenuItem
I'm making a menubar, and I can't press the menu function: "file" and perform an action It's like opening another fxml…… -
Java – why does m2eclipse complain about missing artifacts when the MVN command line is not available?
I have just set up a new installation of eclipse Helios and have configured m2eclipse to use Maven's external (V 2.2.1…… -
Is there a map with variable key length in the Java world?
I need a map, but when I call get (key, n), it should not only return all records with search key values, but also ret…… -
Java – groupingby with collectingandthen – is there a faster / better / cleaner way?
I have the following courses (getters): public class AlgorithmPrediction { private final String algorithmName; …… -
Java – cannot work with Jackson
I wonder why there is no definite way to work with Jackson I just want to parse JSON strings: ObjectMapper mapper = ne…… -
Java – gradle output jar does not have a main class
I have the following simple build Gradle file: apply plugin: 'application' apply plugin: 'java' mainClassName = 'com.…… -
Java – joda time dateformatter displays milliseconds if non-zero
With joda time, I want to display a list of dates that may or may not have milliseconds If an entry has milliseconds, …… -
How to query the M: n relationship with JPA2?
I have an object (blogpost), which contains a collection of M: n elements (tags) How to query an object (blogpost), in…… -
Grails – how do I maintain the order of keys in a Java properties file?
I have groovy code to read the properties file, change the value, and then write it to the same file def props = new P…… -
Is it safe to capture stackoverflowerror in Java?
I have two different function implementations (for example, tree size), one recursive and the other explicit stack Rec…… -
Java – how to upload files on the server folder using JSP
There is already an answer to this question: > recommended way to save uploaded files in a servlet application2 Her…… -
Is it still relevant to replace enumeration structures with classes in Java?
I'm reading the effective java written by Joshua Bloch in 2008. A hint is to replace enumeration structures with class…… -
Java – the portlet URL opens another portlet in a pop-up window
I have a create_ account. JSP hook The question is: how do I provide a portlet URL? How do I access it? In this portle…… -
Java – defines a global uncaughtexceptionhandler for all threads of the application
I want to define an application level uncaughtexceptionhandler in my java application. If an uncaught exception is thr…… -
Using the jigsaw module and jdk9 to run spring boot
What's wrong with this application I think the mixture of classpath jar and module jar is effective For all cans witho…… -
How to use JPA to enumerate the where clause in jpql?
I have an enumeration as an attribute of an entity When I try to use enumeration in jpql suqry, I give an error In add…… -
Java – how to upload to S3 through pause / resume support?
I want to know how to upload files to Amazon S3 through pause and resume support? (via web browser) Is there a sample …… -
Java – when to create a custom classloaders?
Why do you need to create a custom classloaders? A real-world example would be great! Solution Application servers suc…… -
The best way to analyze the HTTP traffic sent by my java code?
I have some new Java code (using Apache commons HTTP Library) and old (strictly using java 1.4 API), and try to rewrit…… -
Java – comments do not work
I'm working on an annotation that forces a class to be immutable Here is the processor code: @SupportedAnnotationTypes…… -
How to write windows software in Java?
I just studied Java in college However, I can only write programs that run on the command line How to use java to crea…… -
Java – what if you only reference objects from garbage?
Suppose there is an object a of class A, which holds a reference to another object B of class B This is the only refer…… -
Java – can eclipse evaluate expressions dynamically?
In some Java ides (such as BlueJ and drjava), users can open an interactive window where they can type Java expression…… -
Java Basics: static functions without names or return types
public class Main { public class Main { public static final Logger LOGGER = Logger.getLogger(Main.class.getName())…… -
Function style of Java 8 link
I have a map < < string, string >, which represents the link from a to B I want to link all possible routes F…… -
Java – how do I name repositories and service interfaces?
How do I name the repository and service interfaces and their implementation classes? For example, I have a model call…… -
Java – set up multi-directional – Android
I am a novice in Android programming. I have a problem with direction I hope my activities can only be viewed in portr…… -
Continuous integration – how do I test JavaFX 2 in a headless environment?
I tried to automatically test JavaFX 2 applications running on Java 7u6 through integrated JavaFX 2.2 As a next step, ……