Recent Posts
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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…… -
When trying to read a file in HDFS from Java, “wrong FS… Expected: File: / /”
I can't read files from HDFS using Java: String hdfsUrl = "hdfs://<ip>:<port>"; Configuration configuratio…… -
Java – detect mouse entry / exit events anywhere in JPanel
Basically, there is a JPanel. I want to know when the mouse enters the JPanel area and exits the JPanel area So I adde…… -
DFA Based regular expression engine with captured Java
Is there any (free) regular expression engine for Java that can compile regular expressions into DFA and capture combi…… -
java – Spring Batch：org. springframework. batch. item. Reader notopenexception: the reader must open it before reading
I read about the problem, but the solution didn't work for me I got org springframework. batch. item. Reader not opene…… -
Java – play! The framework returns a JSON response
I use play! Framework 2.0 and I are new in this framework How to return only the JSON representation of my model in a …… -
How do I use selenium webdriver and Java to close a specific window?
I use selenium webdriver I open the first page and then the second - do something and go back to the first page Before…… -
Java – how to map a class to different tables using hibernate / JPA annotations
At present, my persistence seems to be a very simple problem, but I can't seem to find a way: I have two identical tab…… -
How to view memory allocation stacktrace in Java visual VM
This article describes how to use Java visualvm: http://rejeev.blogspot.de/2009/04/analyzing-memory-leak-in-java.html …… -
Java – JAXB, custom binding, adapter1 Class and joda time
I have a problem. JAXB is generating binding classes for XML schema (I can't modify them for precision) public class D…… -
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 – 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…… -
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 – 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 – 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<…… -
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 – 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 get crc64 distributed computing (using its linear properties)?
I need to spread over large files stored on distributed FS I can handle parts of the file better than the whole file, …… -
Rxjava / rxbinding: how to handle errors on rxview
I use RX Java and rxbindings to view in Android Here's an example of what I'm doing RxView.clicks(btMyButton).flatMap(…… -
Java – how to manually map enumeration fields in jax-rs
How to map a simple JSON object {"status": "successful"} to Java enum in jax-rs automatically? public enum Status { …… -
Learn Java, so I can get clojure
I have a history of hating Java. In the "slow ball" era, I often used it in the late 1990s Therefore, I never really u…… -
Java – use wildcards to create new generic objects
Please explain the compilation time error of this generic code wildcard: //no compile time error. List<? extends Nu…… -
Java – immutable objects and spring / sring MVC: the right choice?
I usually try to design my courses as immutable classes, so I have many advantages in programming stress However, when…… -
Java – unable to instantiate log4j appender
I'm following a tutorial on log4j logging in web applications This is my log4j Properties file: #log to console log4j.…… -
Java fallback mode
I try to find a good way to implement a service that depends on third-party library classes I also have a "default" im…… -
Java – do I need to call releaseintarrayelements on an array created using newintarray?
I have a local method to do some work on bitmaps Inside the method, I obtain image data through a method call, which w…… -
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…… -
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 – 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 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 – 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…… -
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……