Recent Posts
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Java – how to understand Maven dependency tree
Please forgive me if this is a dump problem, but I searched a lot and didn't understand how to actually read Maven dep…… -
Java – hibernate criteria: different entities and then restrictions
I have a standard to return all the data required by the application, basically: Criteria criteria = session.createCri…… -
Java – how to convert jsonobject to gson JsonObject？
I have an org json. Jsonobject object Create gson. From What is the simplest method of jsonobject object? thank you So…… -
Java – how to identify whether a string contains special characters that cannot be stored using utf8-mb4 character sets
Please refer to this tweet and the thread below. We are trying to store similar tweets to the database I can't store t…… -
Java generics and return types
I've just come across something I don't understand Why is every loop illegal when the second is the same? public inter…… -
Java’s better way to delete files (if any)
We need to be in file Delete () before calling file. Exists() before deleting the file File file = ...; if (file.exis…… -
Java – hide the program in the windows system tray
I want my program to display an icon in the taskbar status area near the clock in windows and find a way The thing is,…… -
Java – how to use in Net?
Lucene is a good search engine, but Net version is the official JAVA version (the latest stable. Net version is 2.0, b…… -
Java: socket read timeout exception
I tried to call a very heavy process When I execute this process, I set a ridiculously large number of timeout times: …… -
Java – where do I sort?
I have a database, I query, I don't know where to perform the sorting of results, so far, I have the following options…… -
Java – how to call super (…) and this (…) in the case of overloaded constructors?
I never needed to do this before, but since both must be the "first line" in the constructor, what should I do with it…… -
Reading HTML files into DOM trees using java
Is there a parser / library that can read HTML documents into DOM trees using Java? I want to use the standard DOM / X…… -
Java – how to use hibernate to insert data as soon as possible
I read the file and create an object from it and store it in the PostgreSQL database My file has 100000 files. I read …… -
What’s the difference between Java’s equals () and C’s operator = =?
When a question regulating the use of typeID is C, I suggest it can be used to compare types in objects I don't see it…… -
java – WSContext. Getuserprincipal() returns null for password digest validation
In my web service, I need to record the caller's ID, but wscontext Getuserprincipal() returns null, even if the user a…… -
Java – deploying spring boot applications in Weblogic
I deployed a spring boot application in Weblogic 12C 10.4. 4 403 prohibit the server from understanding the request, b…… -
Java – spring: file upload restful Web Service
I am using spring 4.0 to create a PoC for restful web services @RequestMapping(value="/getcontent/file",method=Request…… -
Java: datainputstream replaced with byte order
The following is my code to replace datainputstream to wrap an InputStream, but in addition to the common method of re…… -
Java – relative to the current date in the Dbunit dataset
I wonder if there is any way to specify, for example, tomorrow as the date in the Dbunit XML dataset Sometimes the cod…… -
Java – simulate a spring validator when unit testing the controller
When coding the unit test postmortem into the code created by another project, I encountered the problem of how to use…… -
Java – how to get int values from a spinner
I use NetBeans 7.1 to write Java I have a JFrame. I have a spinner with integer value on it. I want to know how to get…… -
Java – how to clear bad characters that are not suitable for utf8 encoding in MySQL?
I have dirty data Sometimes it contains characters like this I use this data to query WHERE a.address IN ('mydatahere'…… -
Java – thread exit and uncapped exception: no stack trace
My application is causing a forced shutdown somewhere instead of using the usual (and very informative) stack trace in…… -
Can I use two Java classes with the same name and the same package?
Can I import and use two different classes with the same name and package in Java? For example, suppose I have two cla…… -
Java – configure spring security to use custompasswordauthenticationfilter
I have implemented my own lowercaseusernamepasswordauthenticationfilter, which is just a subclass of usernamepassworda…… -
Do a “memory dump” Java application?
I have Java applications that unfortunately start consuming considerable memory after a period of time To complicate t…… -
Java – can I register a receiver in a test case?
I want to test whether the alarm programmed with AlarmManager is triggered in the unit test. If so, it will be trigger…… -
JavaFX in enterprise web applications – a good alternative to traditional web pages?
We have developed several web applications for different customers, from a simple and boring crud style GUI to a favor…… -
Java – who defines state transitions in state patterns?
I understand that the state pattern can be used to simulate objects that change behavior according to States and vario…… -
java. Lang.illegalstateexception: cannot perform this operation after onsaveinstancestate: – fragment error
Hi, I use segment a and the second segment B. call B and use the asynctask method, but I use this first time, it works…… -
Java – what about Dagger’s custom range?
How to create a custom range with dagger? Are there any guidelines? I didn't find them I am developing vaadin applicat…… -
How to configure Java imported organizations in NetBeans
At present, NetBeans (I use version 7.3.1) has the built-in function of organizing java file import through the menu s……