Java
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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 – if it doesn’t exist, add a new value to the map, or add it
I have a Java util. Map < foo, double > foo of a key class Let's call an example of a map I want to add {foo, f}…… -
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 – 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…… -
Java – can annotation processors be used for code generation?
Suppose I define an annotation named @ myannotation One class X is declared as: @MyAnnotation class X { .... } Now whe…… -
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…… -
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 – wicket & CSS resources
I've been looking for it. I can't find a virtual guide to add my CSS to the wicket website project But before I starte…… -
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 – 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…… -
Java – IntelliJ switch statement uses string error: use – source 7
I tried to use IntelliJ (on Mac OS X) to compile some code I wrote using eclipse I tried to run the following code: sw…… -
Java – how do i disable pop-up form based login for restful endpoints?
I use spring security configuration based on forms and authentication, according to auto config = 'true' I hope that t…… -
How to load Java property files and use them in spark?
I want to store spark parameters (such as input file and output file) in the Java properties file and pass the file to…… -
Exception in thread “main” Java lang.NoClassDefFoundError：org / apache / commons / codec / DecoderException
I try to query Solr through solrj This is my code public class ReadFromSolr { public static void main(String[] args) …… -
Java – how to build an executable jar from a multi module Maven project?
I'm a beginner and don't know much I can build simple executable jars, but how to build a multi module Maven project i……