Java
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Java – volatile variables that will never be assigned null will never contain null?
You can use the following concepts in java examples: public class X implements Runnable { public volatile Object x…… -
Java – foreign key mapping in the embeddable class
I'm using eclipse link for JPA I have an entity that has a compound key consisting of two fields The following are the…… -
Java – how to create a curve between 2 points in 2D and return the points that generate the curve every d distance?
I'm not good at math I have two points in 2D, a (x1, Y1) and B (X2, Y2) I need to create a virtual path from point a b…… -
Java – how does HashSet handle hashcode()?
I'm trying to get a deeper understanding of Java util. Collection and Java util. Map, but I have some questions about …… -
Xdebug, how to disable a single Remote debugging of PHP files?
I am using the eclipse ide to remotely Xdebug There are some PHP scripts run by cron on the server So every cron that …… -
Java – open and close hibernate sessions
This is how I get hibernate session and create a query HSession.getSession().createQuery("query here").executeUpdate()…… -
Java – the best way to avoid code duplication using fragments
I have an application ready to run in the Google play store, and now I'm executing the fragment Therefore, I already h…… -
Java – rfc3986 – which pchars require percentage encoding?
I need to generate a href to a URI Link to / some / path when it comes to reserved characters requiring percentage enc…… -
Java 8 error: interface inherits abstraction and default
I'm trying to write a collection interface library using the new default method syntax in Java 8 to implement most of …… -
Java – localdate minus period gets the wrong result
Subtract a period from localdate (such as "28 years, 1 month and 27 days") to get the wrong result But subtracting a p…… -
Java – JAXB, CXF: elements without objectfactory and @ xmlelementdecl
I am using JAXB and CXF to create a WSDL first web service I don't own WSDL, so I can't modify it I use ftp://ftp.ihe.…… -
Why do Java objects have to be multiples of 8?
I know Java uses padding; The object must be a multiple of 8 bytes But I don't see its purpose What is it for? What is…… -
Java – using OSGi declarative services in the context of JUnit testing
I'm trying to figure out how to use JUnit to implement multi - bundle integration testing in OSGi By integration testi…… -
Java – Magento rest “admin role not found” error
I'm playing with the transcription library（ https://github.com/fernandezpablo85/scribe-java ）, I tried to access Mag…… -
Java – handles unhandled exceptions in the GUI
I mainly write a small tool for technical proficient people, such as programmers, engineers and so on Since these tool…… -
In the Java installation directory, why are there multiple Java Exe file?
Just curious about the directory layout of JDK So there are two separate Java Exe file – one in: C:\Program Files (x86…… -
java. Lang. unsupported operationexception: the application must provide a JDBC connection
I wrote some code to test my hibernate configuration But I encountered this error message: java.lang.UnsupportedOperat…… -
Java – why is it not allowed to narrow the scope while covering it
In Java, when I rewrite a method, the compiler flags any attempt to reduce visibility to an error For example: I can't…… -
Java – the difference between row oriented and column oriented databases in processing information retrieval
Recently, I began to study HBase (a column oriented database) When I passed the source code, a problem kept popping up…… -
Java – handling enumerations in 2.0
This question refers to 1.2 Version 1, it does not compile in different parts, so it is not repeated I want to use enu…… -
How do I automatically upgrade Java applications during startup?
I deployed a Java 1.6 application (~ 30) on several machines and started it as a Windows service My main problem is ma…… -
Java: if you don’t know how to initialize the array size?
I asked the user to enter numbers between 1 and 100 and assign them to the array The array size is not initialized bec…… -
JSF – using javax faces. PROJECT_ STAGE
I want to understand the impact of the "javax. Faces. Project_stage" attribute of a JSF application The following link…… -
Java – how to reduce the processing time of weak references in GC?
At present, the problem I face is that my application occasionally shows long GC time, but these are only due to weak …… -
Java – ActiveMQ connection denied
I tried to use ActiveMQ in my application, but when I tried to connect to the local host, an error continued to appear…… -
Java Web Services / JAXB – Abstract superclasses
I have a package containing JAXB annotation classes and an abstract superclass I want to use this superclass in the we…… -
String… Parameter in Java
See the English answer > varargs and the '...' argument 3 public void method(String... strs); What does "..." mean?…… -
System sound in Java
I'm trying to write an error dialog that I want to call the correct system specified sound Is there any way to access …… -
Java – save data in an XML file
I have an application. I need to save data input as a user in an XML file at a specified location. I need to use java …… -
Java – how to compile multiple proto files in a single command?
I have two proto files in a single directory, and I'm looking for a way to generate classes from these files in a sing…… -
Deployment – clojure / ring: how do I integrate my clojure application with a Java build process beyond my control?
I have a unique build situation I am using lein uberwar to build a war from my ring application and deploy it to beans…… -
Java – if it doesn’t exist, add a new value to the map, or add it
I have a Java util. Map < foo, double > foo of a key class Let's call an example of a map I want to add {foo, f}……