Java
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Check is not empty in Java
Imagine that I generated an XML generated entity in Java, which contains some data I need <Car> <Engine>…… -
Java – inject EJB into eclipse link sessioncustomizer to provide Oracle schema name
In the Java EE 6 application running on GlassFish (3.1.2.2b5), suppose you have a configurationservice, which will rea…… -
How to control the width of jtextfields in Java swing?
I try to have several jtextfields on a single line, but I don't want them to have the same width How do I control the …… -
jsf – FacesContext. Getcurrentinstance() returns null in the runnable class
I tried to call FacesContext. in the run () method of the Runnable class. Getcurrentinstance() to get facescontext, bu…… -
Java-8 – why doesn’t map extend functions?
While using the new Java 8 stream API, I want to know why not: public interface Map<K,V> extends Function<K,V…… -
Java – how do I use the onejar Maven plug-in to set additional class path entries in the manifest?
Is there any way to use the onejar Maven plugin to add arbitrary classpath entries to the jar file manifest? I found t…… -
Multithreading – lockless memory reclamation with dangerous pointers
Hazard pointers is a technique for safely reclaiming memory without garbage collection and lock - free code The idea i…… -
Java – database design, without passing JDBC
I have a database design problem and I am facing one of my projects I try to implement a service, and part of this ser…… -
Java – the best way to implement a large state machine?
Basically, I have a state machine that controls the attack of game characters, and its time is based on the length of …… -
Java – can you write a constructor that does nothing?
To use class methods, I need to instantiate a class At present, this class has no constructor (so I want to write it) …… -
Java – how to clear jtextfield when the mouse clicks jtextfield
When the mouse clicks on the text field, I need to make the program clear the text from the text field I've tried some…… -
JPA – missing descriptor for the native query result of eclipse link POJO – [class]
I use eclipse link to run some native SQL I need to return the data to POJO I followed the instructions of eclipse lin…… -
Java – how to get the activity editor in the Eclipse Plug-in?
In my eclipse plug - in, I need to know if the editor visible on the screen has changed I'm getting the following acti…… -
Align text with java graphics 2D
Can anyone tell me how to find text in Java 2D? This is the code that draws a list of naturally aligned text Font yFon…… -
Java – is Google Guice active?
It hasn't been released for a year, even without small mistakes Commitment to the repository is uncommon and has not b…… -
Java – random can be obtained from the distribution of different mean and standard deviation Nextgaussian() sample value?
This is a combination of Java and basic mathematical problems From random The documentation of nextgaussian () shows t…… -
Java – how to attach written data to a file?
I'm Android I's new developer wants to write some files. I've used a method to write files, as shown below public void…… -
Java – the custom Jackson httpmessageconverter is no longer applicable to spring 4.2
I'm starting from spring platform version 1.1 3. Release update the application to 2.0 1. Release, which changes the S…… -
What is the range of variables declared in static blocks in Java?
Can variables declared within static blocks be accessed elsewhere? Solution Usually, programmers do not need to declar…… -
Java – the same method in the interface and abstract classes
I came to the situation: public interface Intr { public void m1(); } public abstract class Abs { public void …… -
Operating legacy MDB with Java 8 (access 2.0)
Java 8 no longer supports JDBC - ODBC bridges Is there a way to access old MDB files without a bridge in Java 8? Accor…… -
Java – use JDBC to insert slowly on PostgreSQL
I work on a system that downloads data from a cloud system to a local database (PostgreSQL, mysql,...) Now I have a Po…… -
Java 8 method signature inconsistency
Java 8 gives us a new method. It's really a long signature, like this: static <T,K,U,M extends Map<K,U>> C…… -
Java7 watchservice – how to detect renaming / moving of the actual monitoring directory
I am using watchservice to synchronize data files with the application workbench When I rename / move a monitored dire…… -
Connect mongodb created in mongolab through Java application
I created a mongodb instance in Mongolian mongodb://<dbuser>:<dbpassword>@ds041177.mongolab.com:41177/mycl…… -
. Net – number of CLR and GC instances running on the machine?
I created 2 Net application and running on one machine – how many CLRs and GC will there be? Also: I want to have some…… -
Java – akka: how to schedule retry failures when the delay interval is extended?
What is a good way for an actor to try again and fail, but the time interval between retries is getting longer and lon…… -
Change the default button in Java to make it look better
I tried to imitate the default Windows XP simple calculator When I change the background color of buttons in Java, it …… -
Type safe flattening of nested sets / structures in Java
I want to smooth the collection / structure of some T-class elements nested arbitrarily deep in Java >Only live vie…… -
Java: return class (not an instance)
Can I return a class as a static method? I'll explain I have: public class A { public static void blah(){} } public cl…… -
Java – why is meta-inf called meta-inf?
I'm trying to explain the basic principles of web applications I encountered this problem on Meta - inf and Web - inf …… -
Parsing Facebook signed using java_ Request will return malformed JSON
I'm trying to parse Facebook signed in dopost of java servlet_ request. I use Base64 of Commons - codec - 1.3 to decod……