Java
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Java – how to find the parent JSON node when parsing JSON
I'm using Jackson to parse JSON streams The API I'm using is objectmapper readTree(..) Consider the following flows: {…… -
What is the appropriate media type for Java – Hal JSON?
I'm using spring to create restful services, and I'm curious about the syntax of media types According to my understan…… -
Java – Liferay API / jsonws page can only be accessed by administrator users
Anyone can tell me how to restrict ordinary users from accessing Liferay API / jsonws pages The API / jsonws page can …… -
Write 3D games in Java
Hi, I started learning java this summer because I like creating games very much I managed to master the Java se core. …… -
Java – log4j: error with Tomcat 6
I wrote a web application in Java EE I use log4j and Tomcat 6.0 28. When I start my application in tomcat, an error me…… -
Java – log4j2: the location where the log4jcontextselector system property is set for asynchronous logging
I tried to set asynchronous logging in the rest web method currently running in the free profile server (for performan…… -
Select a Java Web Framework 2011
My question is based on the following question: choosing a java web framework now? The reason for my problem is that a…… -
How to make indexof case insensitive in Java
I have a simple question How to use @ L_ 419_ Make indexof case insensitive in 0 @ This question has been answered in …… -
Java: the reference to static context is similar to class self reference ‘this’, which is often used as the coding style
As mentioned in Python, I have been using class self - reference since the recent beginning of Java, whether it is man…… -
How do I find infinite loops in Java Web applications?
One day, the CPU utilization of our Java Web application reached 100% We try to find the problem by using kill - quit …… -
What methods can represent weighted directed graphs in Java?
I can't use any external libraries, so I try to think of some ways to build my own data structure I was thinking maybe…… -
Java EE – why are stateless beans considered pseudo scopes and cannot have circular dependencies?
Using wildfly 8.1, I have several beans, and I try to inject several EJBs into each other It can be said that I have t…… -
When to use ‘Java util. Objects.*’？
I'm browsing the seven functions of Java. They talked about Java util. Objects course What I can't understand is the f…… -
Java – file upload “multipart / form” exception org apache. commons. fileupload. FileUploadBase $InvalidContentTypeException
I tried to upload a file using Apache commons, but threw the following exception org. apache. commons. fileupload. Fil…… -
How do I type π (PI) in Java?
Is there a character in the math API that allows the character π to be represented? Solution You don't even need to us…… -
Java – with restlets, xStream annotations don’t seem to have any effect
Using @ xstreamomitfield in my POJO doesn't seem to have any impact Annotated fields are still exposed in XML or JSON …… -
Java – why is “. Concat (string)” much faster than “”?
See the English answer > string concatenation: concat() vs "+" operator11 for(int i = 0; i < 100000000L; i++) { …… -
Java – what dependencies are required for the embedded ActiveMQ proxy?
I am trying to use the embedded ActiveMQ agent for unit testing as follows: http://activemq.apache.org/how-to-unit-tes…… -
Java – values cannot be placed in MDC
I tried to record several values in onbeginrequest () of requestcycle () in the ticket Here are the codes: getRequestC…… -
Java – why does the scheduleatfixedrate – schedulewithfixeddelay method not use callable
I'm doing some experiments on Java 8 concurrency In the scheduledthreadpoolexecutor API I can see the following two si…… -
Java – set vs list vs array as return type of EJB method
I was recently told that collection should take precedence over list as the return value of EJB methods The argument i…… -
Java – JUnit Derby spring: the in memory database is discarded after each test
In my unit test, I automatically installed some data sources using URLs jdbc:derby:memory:mydb;create=true Create dB i…… -
Java – explains the behavior of automatically incrementing a composite ID sequence using hibernate mapping
I have a table CREATE TABLE `SomeEntity` ( `id` int(11) NOT NULL AUTO_INCREMENT,`subid` int(11) NOT NULL DEFAULT …… -
Is there OLE automation in Java?
Can OLE automation be used in Java? If not, why is it impossible in Java? I want to automatically export Excel spreads…… -
Array – call the constructor with array parameters from PowerShell
I am a beginner and know c# moderation Recently, I was writing this power shell script and wanted to create a HashSet …… -
What kind of Java syntax is “= = null? False: true;”
I'm looking at the code and wondering what this means: Boolean foo = request.getParameter("foo") == null? false:true; …… -
Java: how to check whether a lock can be acquired?
If I want to ensure exclusive access to objects in Java, I can write this: ... Zoo zoo = findZoo(); synchronized(zoo) …… -
Java – stores the contents of a text file line by line into an array
All, the problem I'm facing now is that I don't know how to store the contents of the text file in the array Is it pos…… -
Java generics and number classes
I want to create a method to compare a number, but can have an input of any subclass of a number I see this in the fol…… -
Haskell – parallel strategy using Monad
I often see the use and interpretation of Haskell's parallel strategy related to pure computing (such as FIB) However,…… -
Are the default values of Java annotations compiled into bytecode?
I tried to implement several static analyses for Java bytecode They try to calculate whether a method has specific pro…… -
Java – learn about spring boot
I try to understand the difference between spring boot and spring boot web Starting from this boot tutorial, POM inclu……