Java
-
Multithreading – you can cancel qfuture and report progress
The qfuture class has some methods, such as cancel(), progressvalue(), and so on These can be monitored by qfuturewatc…… -
Java – @ createdby how does it work in spring data JPA?
I used @ createddate on the entity attribute, and I saw it insert the date in dB I don't understand the purpose of @ c…… -
Java – constant warning when running Tomcat from IntelliJ
Suddenly, when I run Tomcat from inside IntelliJ, the output console is constantly bombarded by mail@ H_ 502_ 2 @ (ver…… -
Java asymmetric encryption: the preferred way to store public / private keys
This code generates a pair of public / private keys: KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); ke…… -
Java – JUnit test inheritance does not work
public abstract class GenericTests<T extends Number> { public abstract class GenericTests<T extends Number>…… -
Java – use the Apache httpcomponents client to sign AWS HTTP requests
I am trying to send an HTTP request to the AWS elasticsearch domain protected by Iam access policy I need to sign thes…… -
Java – inject null pointer
We try to refactor a project with Guice The idea is to bind all language interfaces to mixed objects such as French or…… -
Java – hibernate tutorial – where to place the mapping file?
I'm here to focus on Hibernate, an interesting tutorial: http://www.tutorialspoint.com/hibernate/hibernate_native_sql.…… -
Java methods that reference singleton objects at the same time
I have a question about multithreaded method calls in Java Suppose we have a singleton object whose class declaration …… -
Java – shorten method / variable names?
Whether using long is considered a bad style, but descriptive method names such as "adjacetlocationsbystate()" if so, …… -
Java – groovy version 2.4.0 for eclipse two
How to create a groovy project in eclipse and use a custom groovy library? I'm new to groovy and I'm confused about ho…… -
java – org. hibernate. Annotationexception: the referencedcolumnnames reference is not mapped to a single property
I encountered the following exception when mapping one-to-one between two entities The first entity embeds a composite…… -
Java – use selenium to handle pop ups
I have a situation where I click on the link page to open a pop-up window When the pop-up window is opened, the focus …… -
Java – instantiationexception calls a class on newinstance for simple reflection?
I have an abstract class A, which is public abstract class A { private final Object o; public A(Object o) { …… -
Java – string text, practice and reflection
I tried to find a third solution this question I don't understand why I don't print errors public class MyClass { …… -
Java – how to avoid using exception flow control?
I was assigned a project to develop a set of classes that act as interfaces to storage systems One requirement is that…… -
Priority queue using Multimap – Java
I must use Multimap to implement priority queue I use Multimap in Google collections Multimap<Integer,String> mu…… -
Java – how to use spaces in the parameters of Maven 2 exec plug-in
Related questions: Maven exec plugin not reading configuration In my configuration, I need a parameter, which is a fil…… -
Setopaque (true / false); Java
In Java 2D, when you use setopaque, I'm confused about some true and false For example, I know that swing opera means …… -
Java – interpreting type classes in Haskell
I am a C / Java programmer. The main example I use in daily programming is OOP In some threads, I read a comment that …… -
Java – split main and test in gradle’s eclipse build
Today, I tried to switch integration testing from Maven to gradle Everything is fine except that I have a serious prob…… -
How to make command-w close windows on Java or clojure’s Mac OS
I want to close a window / JFrame in the program I wrote in clojure How will this be achieved? Pure Java solutions are…… -
Java – implement clone () for immutable classes
I am developing a class library >I have an abstract base class of matrix, which provides the implementation of some…… -
Use JDBC realm to authenticate Shiro
I'm trying to use Shiro to verify the servlet running in Tomcat 6 I have the following Shiro INI file: [main] ps = org…… -
Dataoutputstream gives me a ‘Java io. IOException: unexpected end of stream ‘?
I'm trying to use httpurlconnection to send a request from an Android application to WebService But sometimes it works…… -
Java – comma separated string of currency values
I have a string that contains formatted currency values, such as 45890.00 and multiple values separated by commas, 890…… -
Multithreading – how to minimize the cost of allocating and initializing nsdateformatter?
I noticed that using nsdateformatter can be quite expensive I find that allocating and initializing objects has taken …… -
Java code for converting country code alpha-2 (in) to alpha 3 (ind)
Using Java, is there a quick way to convert alpha-2 country codes (in or GB) I can get alpha-2 Code: String[] codes = …… -
Is the Java – bouncy castle API thread safe?
Is bouncy castle API thread safe? especially, org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher org.bouncycas…… -
Java – real time collaboration in eclipse
See the English answer > is there an eclipse plugin for collaborative editing? [closed] 3 We have installed the lat…… -
Using play framewok and akka to map diagnostic context records in Java
I'm trying MDC logging all requests in Java. I follow Scala in this tutorial and try to convert to Java http://yanns.g…… -
What is the best open source web crawler tool written in Java?
What is the best open source web crawler tool written in Java Solution Try crawler4j You only need to implement a simp……