Recent Posts
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Java – unable to resolve HttpServletRequest
I have imported the following I want to get the preferred language browser HttpServletRequest request = ServletActionC…… -
Java – cross reference and garbage collection
There is an extensive object graph application The graph mainly consists of a set of subgraphs connected to the rest o…… -
How to set tab order in swing Java?
I want to know how to adjust the Tab order in the Swing interface. I found an example that shows the trick this method…… -
Java – how do I find the JPA version?
How do I understand the JPA version I use in EJBs? to greet Solution Using the Java EE 5 container, you will get JPA 1…… -
Java annotation processing: how do I know that a round is the last?
When abstractprocessor is extended, it is possible to override init (...), but there is no "opposite" method, which wi…… -
Java – hibernate exception: unknown name value of enumeration class
When I try to retrieve a record from the DB, I get the unknown name value of the enumeration class Using JSF 2.0, JPA …… -
Java – joda time dateformatter displays milliseconds if non-zero
With joda time, I want to display a list of dates that may or may not have milliseconds If an entry has milliseconds, …… -
Java – why initialize a member object after the constructor of a superclass?
I encountered an interesting problem yesterday. Although the repair is very simple, I am still a little vague about it…… -
Java – how do I test the Maven prototype I just created?
I've created several prototypes for projects that work now, but I want to be able to verify that the code generated fr…… -
Java – how to improve applications to avoid heap space problems
I have an application that works with many custom objects created in methods and never needs to be outside of them The…… -
Java – struts 2 “%” and “#” login to ognl
Can someone tell me how to use the "%" and "#" numbers in Struts2 ognl? I'm around Google, but I can't find any valuab…… -
Java – HTTP header is used to “accept” httpurlconnection get request
I have read some related questions, but unfortunately they didn't answer my questions because I had specific requireme…… -
Is there any unordered and repeatable collection class in Java?
See English answers > does Java has multiset data structure like the one in C + + STL? 6 It seems that pool is a su…… -
Java – how do I use a JUnit parameterized runner with a varargs constructor?
I wrote a model example to illustrate this without divulging any confidential information This is a "virtual" example …… -
How to use $. Of jQuery in async / await and typescript Post() method
My await statement in the asynchronous function is $. For jQuery Call of post() method, which returns a valid promise,…… -
Java – use BigInteger multiply operator
I wonder if there is a way to multiply BigInteger variables because the * operator cannot be applied to BigInteger So …… -
Java – under what conditions do we need to use composite keys in the database
I've seen that we can use compound keys, where the primary key consists of a combined primary key of two tables Like p…… -
Java – stackoverflowerror when calling recursively
The problem is a strict theory, but I can't find the answer Consider this short procedure: public class SBtst { i…… -
Java – the difference between opencv and OpenCL
Anyone can explain the difference between opencv and OpenCL? What is suitable for Android image processing in Java? So…… -
Java – an efficient data structure to check whether a string exists
I'm writing a program that will add more and more numbers or unique strings to the data structure Once I'm done, I nee…… -
Java – how to open a Lucene 4.3 index?
I'm new to Lucene. I'm trying to open a Lucene 4.3 index using Luke (I created it with my simple Lucene 4.3.1 applicat…… -
Java – JPA: @ embeddable object how to get a reference to its owner?
I have a user class, @ embedded a profile class How to give an instance of a profile a user class reference to its own…… -
Java – gradle output jar does not have a main class
I have the following simple build Gradle file: apply plugin: 'application' apply plugin: 'java' mainClassName = 'com.…… -
Java – add new fields in body exception spring rest
I want to handle exceptions in the rest spring startup application I know that with @ controlleradvice and responseent…… -
Java – httpmediatypenotacceptableexception after upgrading to spring 3.2
After upgrading the spring MVC application to spring 3.2, when accessing some of my URLs, I receive the following exce…… -
Java – is BigInteger thread secure?
I need to update the global BigInteger value through multiple threads – is BigInteger thread safe? Solution BigInteger…… -
Java – Android canvas does not draw path. When the point of path is not present
I encountered some problems with Android canvas when drawing the path canvas.drawPath(polyPath,borderPaint); I also ha…… -
Java byte data type
In the sun tutorial, it says a byte: How does it save memory? What is 2's praise? Solution It saves memory by consumin…… -
Java library for creating straight skeletons?
I have a 2D polygon with holes as input. I need to find its straight skeleton, as shown in the figure: http://www.cgal…… -
Java – Import classes in JSP files
I wrote some code as a java servlet, and now I'm trying to convert it to JSP I wrote a class in a separate file and I'…… -
Java – why do I need to provide closed class objects instead of closed class objects
class OuterA { class OuterA { class InnerA { } } class SubclassC extends OuterA.InnerA { SubclassC(OuterA…… -
Java – spring asynchronous method called from another asynchronous method
I'm using spring 4 and I noticed a strange behavior... If I call asynchronous methods multiple times from a regular in……