Recent Posts
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Java – why this swing error occurs when using repaint () instead of GetParent () repaint()？
This problem is based on the problem I came back with a simple swing dice program The original question I posted is he…… -
Java – JPA and first level cache, what’s the point?
Entitymanager maintains the first level cache for retrieved objects, but if you want to have a thread safe application…… -
Java – pass some JUnit tests
Is there a simple way to tell JUnit that you only need to pass a certain percentage or a certain number of tests? I ma…… -
java – inflater. Inflate gives the nullpointer in the adapter getview method Why?
In my Android application, I'm building my first custom adapter. I now encounter a nullpointer in my expanded convertv…… -
Java – custom Jackson unmarshalling behavior
I use Jackson fasterxml to ungroup JSON There are two kinds of properties in my object: input properties and calculate…… -
Restrict Java generic parameter types to a list of final classes
T is not limited in the following statement abstract public class Defaults<T> However, my defaults class only ha…… -
Java – correct logic, select a card randomly from the card holder until all cards are selected
I need some advice here I want to create a logic that randomly selects one card from a deck of 52 cards until all card…… -
Java – transitive Maven dependency depends on: tree but not displayed in lib directory
I'm using Maven 3.0 Build a large java project My POM XML has a parent, which depends on spring context (compilation s…… -
In Java 8, how to reference a method without parameters and return void?
I have a bunch of methods with this signature: public void sideEffects() {...} public void foo() {...} public void bar…… -
Java – spring MVC class suddenly cannot find dispatcherservlet
My webapp is running and everything is fine until I try to implement some fileUpload Feb 11,2014 4:11:35 PM org.apache…… -
How to query bigquery through ODBC connection?
It would be nice to be able to use bigquery through ODBC I have used MySQL through ODBC, which allows me to switch to …… -
Concat two JSON objects in Java
I want to connect multiple JSON objects I have two JSON like this {"message":"test","status":"0"} And this {"message":…… -
How to automatically convert input characters to uppercase letters in Java
I'm using the scanner class to get input and want to convert the input to uppercase letters when displayed This is my …… -
Error: Java io. IOException: bad value class: org apache. hadoop. io. Text is not a MyClass class
I have my mapper and reducer as follows But I got some strange exceptions public static class MyMapper implements Mapp…… -
Java – is it a good habit to use atomicinteger as an alternative to variable integers?
I have the following situations: public void callMe() { AtomicInteger howManyOdds = new AtomicInteger(0); AtomicInte…… -
Java – why are the best practices for static classes different in OOP?
I'm currently reading about Java best practices. I find that according to this book, we must support non static static…… -
Java – how do I move all even numbers to the front of an array?
Here are the questions – Given an array of integers as input, returns an array containing the same numbers as the inpu…… -
Java – constructor printwriter (bufferedwriter) undefined
I'm trying to create a report that I show syntax errors be used for: new PrintWriter(new BufferedWriter(new FileWriter…… -
Java version for PMD, findbugs and checkstyle
I need to use PMD, findbugs and checkstyle as development projects in eclipse Is java 6 sufficient to use these tools?…… -
Java – generate a large stream for testing
We have a web service. We upload files and want to write an integration test to upload a slightly larger file The test…… -
Java – print out the elements in the array that occur the least
I get an array of size 10. I want to write a program to print out the elements with the least number of occurrences an…… -
Java – Hadoop: can you silently discard failed map tasks?
I am using Hadoop MapReduce to process a large amount of data The problem is, ocassionally, a corrupted file causes th…… -
Java – how do I receive multiple files in InputStream and process them accordingly?
I want to receive multiple files uploaded from the client I uploaded multiple files and requested my server (Java) usi…… -
How to add a date to the java simple date format
How can I add 120 days to the date I currently use simple date format? I've read very few posts about it, but I can't …… -
Java – use spring JSTL and spring form tags together
Can I mix JSTL and spring form tags in JSP pages of spring MVC applications? <form:form method="POST" action="<c…… -
Java – how many string objects are created for the following?
String summer = new String("Summer"); String summer = new String("Summer"); String summer2 = "Summer"; System.out.prin…… -
Java – spring MVC with JPA data binding
My problem is to bind the data obtained by spring from the form to the JPA entity Strangely, if I don't look at bindin…… -
Java – method of finding numeric factors
I'm trying to write a simple program that accepts a non - prime number and returns its first factor I must use a metho…… -
Java – how do I call this class?
I have my main class to call a custom JFrame class called mainframe public class App { public static MainFrame mf; p…… -
Multithreading – forces Perl programs to use threads to use all CPU capacity
I have a laptop equipped with Intel Core I3 CPU. I want to create a simple program in Perl to use 100% CPU capacity My…… -
Java – smack 4 throws “sslhandshakeexception: validatorexception: suncertpathbuilderexception” on the connection
For the integration test of my XMPP stack, I set up a vysper server (0.7) on localhost Question: Caused by: javax.net.…… -
Java – is delayed initialization using immutable data always thread safe?
I have two classes a and B: class A { private final String someData; private B b; public String getSomeDa……