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java – Class. Getresource (classname) gave me NullPointerException
I have built a platform - independent library and I want to use it in J2SE and Android projects In this library, I hav…… -
Java – use the runtimemxbean instance and system Getproperties reads the difference between system properties
What is the difference between reading system properties in this different way RuntimeMXBean RuntimemxBean = Managemen…… -
Generics (and wildcards) in Java
I'm reading a book on Java. It tells me that the following two pieces of code are equivalent: public <T extends Ani…… -
Java – set password in sqlcipher
I want to create a new encrypted database with sqlcipher. Because of the following link, I don't really explain how to…… -
Is java 1.7 stable or beta?
I want to switch from 1.5 to Java 1.6, but I think it's best to use 1.7 instead of 1.6 Solution We are currently using…… -
Java – combines JPA and JDBC operations in a single transaction
So I have an application with some legacy JDBC calls that I need to update with some additional JPA operations I need …… -
Java – the storm collapsed 23 hours later
Hello, I have a basic storm application setup, which receives a tweet stream and stores them in the MySQL database The…… -
java – Scanner. Findinline() has a large memory leak
I am running a simple scanner to parse a string, but I find that if I call it often, I will get OUTOFMEMORY error This…… -
Java – handles schema changes when handling multiple functional branches
Is there another way or some tool to handle database schema changes in multiple parallel functional branches instead o…… -
Java – combines JPA and JDBC operations in a single transaction
So I have an application with some legacy JDBC calls that I need to update with some additional JPA operations I need …… -
Java pong game graphics or geom 2D
My first project was to create a game pong. Com in Java Here I calculate the angle of the ball after hitting the ball …… -
Android does not respect meta tag deletion?
You are actually deleting meta tags (you can verify through DOM - try reminding $("#metatag"). Length after deletion) …… -
Print vowels with words in Java
I'm a beginner of Java. I'm learning this course and need some help Basically, the user will enter a string and the pr…… -
Setopaque (true / false); Java
In Java 2D, when you use setopaque, I'm confused about some true and false For example, I know that swing opera means …… -
Java – string text, practice and reflection
I tried to find a third solution this question I don't understand why I don't print errors public class MyClass { …… -
Java – groovy version 2.4.0 for eclipse two
How to create a groovy project in eclipse and use a custom groovy library? I'm new to groovy and I'm confused about ho…… -
Java – inject null pointer
We try to refactor a project with Guice The idea is to bind all language interfaces to mixed objects such as French or…… -
Java – constant warning when running Tomcat from IntelliJ
Suddenly, when I run Tomcat from inside IntelliJ, the output console is constantly bombarded by mail@ H_ 502_ 2 @ (ver…… -
Java – how to sort by count () in JPA
I am using this JPA query: SELECT DISTINCT e.label FROM Entity e GROUP BY e.label ORDER BY COUNT(e.label) DESC I did…… -
Java – why does LinkedHashMap maintain iterations of two-way linked lists
Because there is no internal and reasonable explanation in any thread >For insertion order, it's enough to maintain…… -
Java – where are the auxiliary courses in Guice jar?
I downloaded Guice 2.0 and 3.0 through maven, and I couldn't find the whole com. Com in jar google. inject. Assistedin…… -
Java – how to add local library paths to JUnit tasks?
I have a java project that uses this driver for serial communication The driver uses DLL under windows to create seria…… -
Java 8 uses generic type method references
I have the problem of combining Java 8 method references with generic types I have simplified my problem and made it c…… -
Java – failed task ‘: app: compiledebugndk’ cannot run this command NDK build cmd
Error:Execution Failed for task ':app:compileDebugNdk'. Error:Execution Failed for task ':app:compileDebugNdk'. Error …… -
Java – given a 2D integer array, recursively find the path with the sum of the given number
Given a two-dimensional array, I need to recursively return a matrix whose path sum is a given number The path matrix …… -
Java – UUID randomly generated with duplicate
I use the following functions to generate UUIDs UUID.randomUUID().toString() In prod, we have 50 servers (application …… -
Java – real time collaboration in eclipse
See the English answer > is there an eclipse plugin for collaborative editing? [closed] 3 We have installed the lat…… -
Java – comma separated string of currency values
I have a string that contains formatted currency values, such as 45890.00 and multiple values separated by commas, 890…… -
How to make command-w close windows on Java or clojure’s Mac OS
I want to close a window / JFrame in the program I wrote in clojure How will this be achieved? Pure Java solutions are…… -
Java – how to use spaces in the parameters of Maven 2 exec plug-in
Related questions: Maven exec plugin not reading configuration In my configuration, I need a parameter, which is a fil…… -
Java – instantiationexception calls a class on newinstance for simple reflection?
I have an abstract class A, which is public abstract class A { private final Object o; public A(Object o) { ……