Java
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Multithreading – is the method pointer assignment thread safe?
Example: Suppose I have the following clues (please do not consider the contents used in the thread context execution …… -
Java – = and =
I've been misplaced = many times, I think I've always forgotten, because I don't know the difference between the two. …… -
Java – hotswaping code to “mvndebug Tomcat: run”
Usually I use mvndebug Tomcat: run to start Tomcat After the code changes, I need to use MVN Tomcat: redeploy This is …… -
Java – how to pass map parameters or objects to post requests through transformation?
I encountered a problem passing a map parameter or object to a retrofit post request I follow square, kdubb labs tutor…… -
Java. Java in JDK class lang.ref. Memory leak of WeakReference object
The following simple code reproduces Java. Java in the heap lang.ref. Growth of WeakReference objects: public static v…… -
Glassfish 3.1. 2 JDBC realm has a new password encryption algorithm field what is it?
The GlassFish JDBC realm has several different properties that you can set I'm interested in digest algorithm and pass…… -
Java – Maven compilation dies of “kill”
I run a large java project compiled by Maven 2 on a Linux virtual machine [debug] source source: [debug] / home / {...…… -
Java – hibernate search, Lucene or any other option?
I have a query to do Ilike on the size of string or text field (500000) in Table 11, but Ilike is obviously too large,…… -
Concurrency – Sinatra websocket Celluloid ID
Do any of you know how to run a quick code example of a Sinatra application running on celluloid: IO and use websocket…… -
Java – I should call ugi. before every action on Hadoop. checkTGTAndReloginFromKeytab()？
In my server application, I am connecting from my java application to the Kerberos secure Hadoop cluster I am using va…… -
Java – use notnull annotation in method parameters
I just started using java 8's @ notnull annotation and got some unexpected results I have this method: public List<…… -
The fastest and most effective way to search for key value pairs in Java?
Disclaimer: What is the fastest and least memory drain method for searching key value pairs? I will store items in a k…… -
Java applet – was it wrong today?
I have some extraordinary computing code that needs to be applied to the data downloaded into the browser Dom and obta…… -
Java sorting based on two columns
Say I have such a watch: String | Int1 | Int2 "foo" 5 0 "faa" 4 1 "zaa" 0 1 "zoo" 4 …… -
Java – generate random IP address
I want to generate some random IP addresses But the generateipaddress function returns 0.0 0.0 string as IPAddress But…… -
Java: have you ever seen a compiler or tool re-enter the last comma in the array initializer?
My mystery starts by thinking about the code: import java.util.Set; import javax.annotation.processing.*; import javax…… -
Is there a Perl implementation in Java?
I am looking for a Perl implementation in Java Jython is similar to python I need to run some Perl code in a Java clas…… -
java – Hibernate Session. Save() does not return a value?
The following code will throw a conversion error I'm new to hibernate Do not know why? Solution session. The return va…… -
Java How to synchronize getters and setters correctly?
If there are several mutable properties in an object that will be executed by multiple threads, I understand that they…… -
Java – there is no such method. There is an error when creating JUnit test
I have tried to find out this problem in the past two days, and I have no luck I'm just trying to create an annotation…… -
Java – pass parameters using GWT history?
I have a page called orders and a page called orderdetails As described in the excellent MVP tutorial, I am using hist…… -
Java – use write Xlsx replace the existing worksheet with R package xlsx
I am using package xlsx version: 0.0 7 date: August 1, 2014 In R version 3.0 1 (May 16, 2013) – good sport platform: i…… -
Java – collection removeAll ignore case?
OK, that's my problem I have to use HashSet. I use the removeAll method to delete existing values from another collect…… -
Why do you need to “and” some character conversions in Java bit by bit?
Here, I am using java to c# sample application translation, involving encryption (AES, RSA, etc...) At some point in t…… -
Bad use of very large strings? (JAVA)
Is there any negative creation of huge strings? For example, if we read text from a potentially large text file: while…… -
Java – after upgrading from 12 to IntelliJ 13.1, the Maven project will not compile
My code will not compile after upgrading Importing from a library containing dependencies for Maven shows a compilatio…… -
Format the PowerShell string containing the hash table value
The answer may be simple, but it took me half an hour to solve the problem Suppose I have the following hash table: @ …… -
Java – variable or immutable classes?
I have read some design books. Immutable classes improve scalability and write immutable classes as much as possible B…… -
Java – JPA best practice: statically finding entities
Imagine that an event entity references a state entity: @Entity @Table(name = "event") public class Event() { @Id …… -
Java – handling custom exceptions in spring security
We are using spring MVC spring security hibernate to create a restful API Authentication can occur in a variety of way…… -
Do java blocked threads consume more CPU resources?
I want to ask if Java will use more CPU resources when a thread is blocked, that is, waiting to lock the monitor curre…… -
Java – spring crudrepository exception
I have this spring data crudrepository to handle CRUD operations on DB @Repository public interface IUserRepository ex……