Java
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Java – firestore – objects with internal objects
Custom object with (documentsnapshot documentsnapshot) parameter It is also the internal object of firebsae. It retrie…… -
Java – spring security authorizes the requests value from the database
I want to configure the authorize requests value from the database when the server starts At present, I have given the…… -
Link to any online tutorial on JSR 330: dependency injection in Java?
I'm looking for some tutorials on JSR 330: dependency injection in Java Google search doesn't provide much information…… -
Java – is ThreadLocal better than HttpServletRequest setAttribute(“key”,“value”)？
The servlet specification (see my previous question) guarantees that the same thread will execute all filters and asso…… -
Java – how do I ensure that a given dependency is included in my application using the spring framework?
This will be an indescribable problem, but there are We are using Delphi spring framework ( http://code.google.com/p/d…… -
How wildcards work in Java
I'm reading a java tutorial on wildcards in generics In the following code: void printCollection(Collection<Object&…… -
Java – running Google App Engine applications on multiple client domains
I want our customers to integrate our Google App Engine Application into their domain For example, suppose a customer …… -
Java – hibernate conditions use group by and return entity list
I'm trying to use group by in my standard I need to do this: SELECT b FROM Book b GROUP BY volumeCode; I have the foll…… -
Java – Sam type optimization
The working document describing the status of project lambda refers to the so-called Sam (single abstract method) type…… -
Java – hibernate restricted result query
How does the maxresult property of a hibernate query work? In the following example: Query query = session.createQuery…… -
Java – any algorithm for the “flip all” (light out) game?
In this game: http://www.mathsisfun.com/games/allout.html OK, after reading some answers and comments (and taking a qu…… -
java – MethodHandles. lookup(). defineClass retention
MethodHandles. Lookup. Defineclass generates a new class from the byte array at run time Under what circumstances can …… -
Java – why can I assign a value to a char variable without explicit conversion?
I wonder why this clip works char ch1; ch1 = 'a' + 1; System.out.println(ch1); In line 2, instead of promoting the rig…… -
Java – short for bitwise operations
I use a technology called DDS. In IDL, it does not support int. therefore, I think I will use a short one I don't need…… -
Java – why can’t my JNI code successfully find the GetMessage method of jthrowable?
I'm trying to access the message in jthrowable and handle the exception generated when the class cannot be found Howev…… -
Java – how to sort the values of the HashMap freemaker template
I have this HashMap in Java: HashMap<String,String> map = new HashMap<String,String>(); map.put("k1"…… -
The JPA / Hibernate timestamp is not saved in the database / object entity
I'm using javax Persistence as my entity object MySQL for database @Column(name = "ENTRYDATE") private Date entryDa…… -
Java – how to resolve exceptions in bufferinputstream mule, the type of message payload
I've converted to a byte array, but I keep getting this error: ERROR 2015-02-25 11:12:30,517 [[ESR].HTTP_Request_Liste…… -
How do I detect completed resizing operations in JavaFX?
I have a stage, a scene and a WebView node When I expand the window to a larger size - things get very slow due to Web…… -
Java – find Net 3.5 / J2EE architecture concept comparison article / chart
We're thinking about bringing the Net technology combined with Java Technology (WCF, JBoss / ESB, mom, WPF, WF), I nee…… -
Java – disjoint set data structure that supports deletion
Suppose we have a set of N disjoint nodes {node1, node1,..., noden} What is the fastest data structure and algorithm f…… -
Java – override spring: message tags with database values
I use spring to display messages in the properties file I want to be able to override the < spring: Message > ta…… -
ANTLR V4, javalexer, and javaparser return null as a parse tree
I am using ANTLR V4 to extract the parse tree of Java programs for other purposes Let me start with this sample: ANTLR…… -
Java – cannot resolve any bean of type [org. GlassFish. Jersey. Message. Filtering. SPI. Objectprovider]
I tried to transfer from Moxy to Jackson JSON media provider to serve my jersey network, and found several problems I …… -
Java – meaning of crossing out breakpoints in eclipse [copy]
See English answers > what different breakpoint icons mean in eclipse? 5 Solution This means that you have chosen t…… -
Java – SSL debugging in eclipse
The following error occurred while running the eclipse application javax.net.ssl.SSLHandshakeException: sun.security.…… -
Java – custom sorting string list (following Chamorro language sorting rules)
I'm trying to sort the string list for the Pacific island language (Chamorro) In this language, Ng is considered a let…… -
Java Swing; How do I make it so that the program starts on the far right side of the screen?
By default, my swing program starts at the top left corner of the display Is there any way to make it pop up on the ri…… -
Java – who will automatically pack / unpack?
Does the compiler or runtime perform automatic boxing / unpacking? Consider the following example: public Integer get(…… -
Java – how to programmatically change the color selected in the check box
I use it in Android Check@R_88_2419 @View I want to change its color when checking Now it is the default dark green. W…… -
In Java, is there any way to read the file when it is locked by another thread?
So I use the following command to create a lock on the file so that I can edit it exclusively: File file = new File(fi…… -
Java – if the value in JSON is null, the default value is provided for the property
Suppose I have a class, that is private class Student { private Integer x = 1000; public Integer getX……