Java
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Java – add parameters to the job context from the tasklet step and use them in subsequent steps of spring batch
Now, I use jobparameters to get the file names of my flatfileitemreader and flatfileitemwriter My batch can be tested,…… -
Java – servlet filter “proxy”, which only acts on the response of the remote endpoint
I need that some HTTP requests must be redirected to the spring boot web application / service, but on the requester s…… -
Java – what are the benefits of using “import static”?
What are the benefits of using "import static"? Solution In general, you should use the static import very sparingly O…… -
Java – replace El in JSP with spel from spring 3.0
Tired of old el, unable to call bean and other methods in JSP Can I use spiel from spring 3.0 in JSP? Solution Upcomin…… -
Multithreading – synchronous counter in clojure
If I want to keep a global counter (for example, count the number of incoming requests across multiple threads), the b…… -
Java – replace cutycapt
Is there any alternative to cutycapt... That can be accessed using the Java library In short, cutycapt is a cross plat…… -
How to set timeout on BufferedReader and printwriter in Java 1.4?
How do I set timeouts in BufferedReader and printwriter created using socket connections? This is my code for the serv…… -
Error when using logmanager (l4j2) and Java 8 (java.lang.reflect.annotatedelement cannot be resolved)
When I switched the JDK version of a new project from 7u45 to 8u20, I encountered a strange error At the beginning of …… -
Processing lists using rxjava and retrofit
I have several API calls (sequential, asynchronous), some of which return lists My API interface is as follows @GET("/…… -
Java – get the most common image colors
I want to get the most common colors from the image I use Java and I want to have the main color Is there any CBIR Jav…… -
The package imported by Java does not exist
I'm trying to use pdf@R_688_2419 @To write a simple PDF file, but the problem is that I received an error: cannot find…… -
Java – let actionlistener listen for changes in jtextfield instead of just entering?
So you may know that if you have a text field and add an actionlistener, it will only listen to the buttons However, I…… -
JPA best practices and Java 8 optional return?
I like the semantics of Java 8. I use a lot of such code in my Dao: public Optional<User> findBy(String username…… -
Accessing Gmail from Java
I need a library that allows me to use Java for email operations in Gmail (e.g. send / receive mail) Solution Have you…… -
Java – the best GWT codesplitting design encapsulates “modules”
At present, I am facing a challenging problem related to GWT code segmentation. I hope to provide some help I'm curren…… -
Write a pattern method in Java to find the most common elements in an array
The question is: Here's my code that almost works, except for single element arrays publicstaticintmode(int[]n) { Arra…… -
LRU caching in java with generics and O (1) operations
This is a question in the interview The idea is to define a data structure instead of using Java's built-in LinkedHash…… -
VHDL – why can’t I add this ` STD_ logic_ vector`
What happened here? Why do I get an 'operator parameter type mismatch', and what should I do to solve it? -- -- 32-bit…… -
Object pool for Java wrapper and string
As we all know, sometimes Java uses object pools as wrappers and string types, and sometimes it doesn't For example: I…… -
Java – partially ordered comparator
How to implement Java. Net that sorts its elements according to the partial order relationship util. Comparator？ For …… -
Java – how to compare the instance type of an object with a generic type?
How do I write this code in Java? public class ComponentsManager { private List<IComponent> list = …… -
Java – compare strings to JSTL
I have two strings that I need to compare, but even if they have the same value or different, it always enters the sta…… -
Java – can we call the service () method from the destroy () method in the servlet?
This is one of the questions I interviewed the other day: Can I call the service () method from destroy()? Thank you i…… -
Java – how do I go from XML spring scheduling configuration to annotation / code configuration?
I am trying to convert the following spring task XML configuration to a pure code / annotation version: <task:execu…… -
Java 8 extracts the first key from the matching value in the map
Suppose I have a map with a given name and last name pair, and I want to find the given name of the first entry in the…… -
Java ‘prototype’ mode – New vs clone vs class newInstance
In my project, some "prototype" factories create instances by cloning the final private instances The authors of these…… -
Java – Open Source improvement or replacement of swing components
I have developed many desktop Java applications using swing, and swing is very powerful (once you get its suspense). T…… -
Java – failed to start namenode in Hadoop?
I configure Hadoop in Windows 7 from tutorial 16/01/19 15:18:58 WARN namenode. Fseditlog: class not configured for C, …… -
Java – runtime dependency injection and spring
My current project is to use spring, and our architect decided to let spring manage services, repositories and factory…… -
Java – Apache POI uses HSSF much faster than xssf – what’s next?
I use Apache POI to parse There were some problems with xlsx files - I received Java Lang. outofmemoryerror: Java heap…… -
Multithreading – how to reliably pass a signal to another thread in a pthread?
I tried to write a simple thread pool program in pthread However, it seems that pthread_ cond_ Signal will not block, …… -
The Java – JAXB xmladapter method does not throw an exception
I am using JAXB xmladapter to organize and ungroup Boolean values The application's XML file will also be accessed by ……