Recent Posts
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Java – is entitymanager really thread safe?
I'm talking about the basic usage here: @Stateless public class BookServiceBean implements BookService { @Persistenc…… -
Java – Hibernate: standards and collections
I have a question about hibernate and criteria I have two classes: public class Place{ long id; String name; …… -
Java – IntelliJ and Maven source folder issues
I tried to create a simple java webapp using IntelliJ (v11.1.3) and integrate it with a simple Maven POM file to downl…… -
Java – how to disable speed logging
I've been trying to disable the velocity log, and the only way I've found so far is to set the positive result: runtim…… -
Java – how to create a copy of the same object using different references?
Friends, I'm facing a problem. I have a phonecontacts list, which contains names and phone numbers I want to copy it i…… -
Java – jetty: stopping programmatically causes “1 thread cannot be stopped”
I have an embedded jetty 6.1 26 examples @Override protected void doGet(HttpServletRequest req,HttpServletResponse res…… -
Java – cannot work with Jackson
I wonder why there is no definite way to work with Jackson I just want to parse JSON strings: ObjectMapper mapper = ne…… -
NoClassDefFoundError uses Jackson 2.2 X with gradle on Android
For my android project, I set gradle with Jackson 2.2 X is as follows: // build.gradle buildscript { repositories …… -
Java – why are the values of class HashSet sorted when I use iterators?
I have the following code on the main method. When I traverse set and print the value, the value has been sorted What'…… -
Java – non null attributes refer to null or instantaneous values of persistent values
I try to use JPA 1 to persist two different entities and use hibernate to implement it Parent entity class @Entity @Ta…… -
Java – is it effective to handle runtimeexceptions in some cases?
As I have understood from several tutorials, runtimeexceptions should not actually be caught because they should revea…… -
Java – find JDBC datasource in WebSphere 8.5
I want to use JDBC connection in my webapp, which is configured in WebSphere (like here: how to use JDBC in JavaEE?) I…… -
Reading JSON two-dimensional array in Java
Each news item has three contents: title, content and date To retrieve entries from the database, I want to use jsonob…… -
Java – get the current SVN revision in webapp
What is the best way to display / use revisions in Java webapp? We just use ant to build our War files, no buildserver…… -
Does Java – mockito have the same idiom as jmock’s country?
The book "object oriented software" provides several examples in jmock, in which the state is explicit and will not be…… -
Java – garbage collection and manual memory management
This is a very basic question I'll use C and Java to make it, but it's really language independent struct Obj { bo…… -
What is the main difference between the optional Scala option of Java 8 and Haskell’s may?
I've read several articles about the upcoming optional types in Java 8, and I want to know why people keep suggesting …… -
Java 8 – ternary operator return function not compiled
Can anyone tell me why not compile? public class TestClass { private boolean doThis = false; protected void …… -
It’s a ‘. ” Member access is considered an operator in Java?
In Java, I can access public members of a class You can see in the second line of the main method of the following exa…… -
Java – how to verify a secure password Regular expression on char []?
This question is a follow-up to this question: Why is char[] preferred over String for passwords? This is a good quest…… -
Open source JavaFX 2.0 component library [closed]
Do JavaFX 2.0 have any good component libraries / repositories? In particular, I am looking for open source projects t…… -
Java – reads and stores the contents of the file as a double array
I need to write a program to read and store input files with double arrays in Java The number of values in the file is…… -
Java – groupingby with collectingandthen – is there a faster / better / cleaner way?
I have the following courses (getters): public class AlgorithmPrediction { private final String algorithmName; …… -
Java – guava dependency on jar package size – is there a small version?
I just raised the version of guava library from 9 to 10 and noticed that the jar file size has increased 1.5MB just to…… -
What happens if you use deprecated methods / functions in Java?
Any problems with using deprecated features in Java? If so, why keep this function? Is it a bad habit to use disapprov…… -
File I / O: read from one file and write to another (Java)
I'm currently working in a lab in my CPE class. We have to create a simple program from Txt file and print them to dif…… -
Java – what is dot casting?
In this Code: c = (char)(c - 'A' + 'a'); Why do we need a char? Is that foundry right? Suppose that C on the right sid…… -
Java Apache spark: long conversion chain leads to secondary time
I have a java program that uses Apache spark The most interesting parts of the program are as follows: long seed = Sys…… -
Java – keep the dead line alive
In an interview with me, I raised the following questions (a few years ago) I have argued that there is no way But he …… -
Java – the order of automatically wrapped @ repeatable annotations
Before that, I used to manually declare the wrapper annotation using an array, and then call it like this: @Foos({ @Fo…… -
Java – numberofviewsinsession and multiple tags
I have a big problem with my application and memory The application (Java with JSF / RichFaces / facelet) is used by a…… -
java – android. permission. WRITE_ SECURE_ Settings error
Hello, my problem is that when I try to change the weather or no GPS settings are enabled, I get the following error 1……