Java
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What does this Java generic paradigm do and what is it called?
I'm looking at some Java classes with the following forms: public abstract class A <E extends A<E>> imple…… -
Java – using thread Sleep() limits the frame rate
I'm making dynamic wallpaper, so don't worry about physical collision I just want to keep the frame rate as smooth as …… -
Java – how do I know if locale is in 12 or 24 hour format?
See English answers > How do I find out why a locale uses 12 or 24 hour time in Java? 3 I found this: if (android.t…… -
Log4j in Java – logils: how to log in to a file?
I'm in Grails config This log4j configuration is available in groovy log4j = { error 'org.codehaus.groovy.grails.…… -
Java – using PostgreSQL, why doesn’t hibernate / JPA create cascading constraints?
I have an entity: @OneToMany(cascade = CascadeType.ALL,mappedBy = "bar") private Set<Foo> fooSet; An entity foo:…… -
Java – spring batch: different job initiators for different jobs
I have two different jobs (actually more, but assume 2 for simplicity) Each job can run in parallel with another job, …… -
java. security. AccessControlException：access denied(“java.lang.RuntimePermission”“accessClassInPackage.sun.reflect.annotation”)Spring
I use Google application engine and spring security to create a simple spring MVC application When I run my applicatio…… -
Java – Apache POI docx – how to set the page size?
Does anyone know how to change the page size (from letter to A4) for X wpfdocument (docx)? I can't find any printsetup…… -
Java messaging service and Haskell
I wonder if there is any way to receive JMS messages from some providers in the Haskell program, such as ActiveMQ or w…… -
Java – Jackson Deserialize the missing attribute to null optional
Suppose I have such a class: public static class Test { private Optional<String> something; pu…… -
Java – sqlitedatabase ‘does not implement interface’
This error occurs when sqlitedatabase is used as closeable I have a sample project to recreate it: https://github.com/…… -
Java – convert simpledateformat to datetimeformatter
Therefore, when trying to replace some legacy code with simpledateformat and date, use Java time. Datetimeformatter an…… -
Java – types are created safely to be passed to comparator Function instance of comparing()
Suppose I have a method with the following signature: <T,U extends Comparable<? super U>> Comparator<T&…… -
Java – how to build and run birt source code in eclipse Mars
I can get birt source (4.2.2 branch) from here: https://github.com/eclipse/birt/ Use M2e (Maven integration of eclipse…… -
Should the Java – domain model mapper be static?
In many projects I participate in, we often have many classes to map content from one domain model to another For exam…… -
Java – the request method ‘post’ is not supported
According to spring documentation here: They have completed the latter and can be implemented using the following spri…… -
Obtain the IPv4 address of Ethernet adapter in windows using java 1.5
problem My windows system has multiple Ethernet adapters Given the name of the Ethernet adapter, I need to find its IP…… -
Java – use JAXB to ungroup XML into existing objects
I have an XSD generated from a set of existing Java classes. At present, it successfully ungroups XML messages into ob…… -
Java – scrolling composites with slow redrawing look ugly
I am implementing the Gantt chart component for SWT, which needs to be redrawn (for example, the whole visible part of…… -
Java – search for data in Web sites
I'm new to Java and have some problems The main idea is to connect to a website and collect information from it and st…… -
Debugging – what are the negative consequences of shutting down the debug heap? (_NO_DEBUG_HEAP == 1)
The initial stage of my program loads a large amount of data into the STL container I found it would take a few minute…… -
Java – use local EJBs in the same container but different ears
I'm trying to use local EJBs in the same GlassFish, but different ears But GlassFish cannot find the local EJB or use …… -
. Net – optimistic concurrent remove method of concurrent dictionary
I look for a method in the concurrentdictionary that allows me to press the key to delete an entry. If and only if the…… -
Java – how do I set a URL that contains the thymeleaf & symbol?
I have something similar: Locale defaultLocale = Locale.getDefault(); final Context ctx = new Context(defaultLocale); …… -
How do I prevent duplicate edges from being created between the same vertices in orientdb?
I have vertex "character" and edge "know" This is my SQL example of how to create it CREATE CLASS Person EXTENDS V; CR…… -
How to pass JSON and file to rest API in Java?
My main question is how to pass JSON and file to send the request to the rest API? What does the spring framework need…… -
Java – what is the purpose of using local variables to hold global variables?
I looked at string Hashcode () method source code This is the implementation of 6-b14 and has changed public int hashC…… -
The radio button in Java – struts 1 ActionForm does not have “selected”
I have a JSP page with many questions and an ActionForm with a map with input names and values When I load the page, t…… -
Is there any way to find the number of threads that the task manager runs in Java?
In Java, if I start 1000 threads using the loop shown below, is there any way to monitor the number of threads actuall…… -
Java – transfer privatekey from keystore and use JNI in OpenSSL
I have an Android application using webrtc Everything is perfect But now, the main problem is encryption In order to m…… -
Java – why is my quicksort performance worse than my mergeport?
Did I miss anything? The source is short and can be run and commented at any time for better understanding I need to k…… -
Java – EJB: using entitymanager in postconstruct method
After constructing the bean, I want to use the entitymanager to retrieve data from the database It is not possible in ……