Java
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Java classloader authorization model?
When loadclass () is called on classloader, does classloader first check whether the class is loaded, or delegate this…… -
Cucumber JUnit runner Java lang.NoSuchMethodError：
Try to do some automated testing JUnit test I created two files and edited the pom.exe that came with the Maven projec…… -
Java EE – how can multiple requests (using wicket and JPA) attach entities (or their associations) to the current persistence context?
I am using wicket based web application on Java EE I'm trying to find a way to ensure that any entity used as a model …… -
Why can’t this java process terminate?
I have an intermittent problem on the build server, where the java process under construction cannot be terminated and…… -
Java – why can’t I Invokeexact() is here, even if the methodtype is OK?
For one of my projects, I have to make dynamic calls to constructors But since this is java 7 and uses the "classic" r…… -
Java – why is standard query not recommended in Hibernate 5?
As we already know, the standard query in Hibernate 5 has been deprecated In previous versions of hibernate, this was …… -
Write a tar file of unknown (large) size in Java
I want to write a large stream of unknown size with a tar file in Java I know Apache has handles tar files, but they a…… -
Java – is reloading webapp in Tomcat a simple and fast way in a development environment?
I run Tomcat 6.0 on windows I have the "monitor Tomcat" system tray icon, which allows me to start and close tomcat, b…… -
How to create a simple but well structured score table (score) in Java?
I'm using very basic sound synthesis to create audio and effects in my game Basically, I have some ways to make a freq…… -
Java: interface containing internal enumeration; Extend functionality in implementation classes
I have the following interface: @ h_ 502_ 2@package example; import java. awt. Point; public interface Thing { public …… -
Java – can I schedule messages using a custom algorithm instead of using rabbit MQ for looping?
I am using the looping function of rabbitmq to send messages among multiple consumers, but I can only receive one mess…… -
Java – extract files using junrar
I asked a question about extracting rar files in Java. Someone pointed me to junrar The official website has been clos…… -
Java – how to sort Horizontally Partitioned Data
I have a telco billing software system There are daily user telephone records Logs are divided by date (month) level E…… -
Java – can eclipse automatically generate interfaces for third-party library classes?
I work with Apache's ftpclient class in the Apache public network library Unfortunately, it does not implement interfa…… -
Java – cannot instantiate testexecutionlistener
When I run the following test from eclipse, I get a series of messages that cannot instantiate testexecutionlistener i…… -
Java – RGB to CMYK and return algorithm
I try to implement a solution to calculate the conversion between RGB and CMYK, and vice versa This is me so far publi…… -
Java – “illegalargumentexception: unmappable [1]” and compress the file with Greek characters
I want to use zipoutputstream to compress a file on windows (7) The problem is that the file name (and file content) a…… -
ORM – JPA 2.0: count any criteriaquery?
I try to achieve the following convenient methods: /** * Counts the number of results of a search. * @param criteria…… -
Java – need space between currency symbol and amount
I am printing currency in INR format as follows: NumberFormat fmt = NumberFormat.getCurrencyInstance(); fmt.setCurrenc…… -
Java – what does it mean in a collection?
What do you mean < E > in the code set < E >? Solution This is the use of generic drugs Check this intro o…… -
javax. mail. Authenticationfailedexception: connection failed, no password specified?
This program attempts to send an email but throws a runtime exception: javax.mail.AuthenticationFailedException: Faile…… -
Java – fatal error: content not allowed in 1:1: Prolog
I'm using Java and I'm trying to get XML documents from some HTTP links The code I use is: URL url = new URL(link); H…… -
Why not StringBuilder= (string) in scala?
This behavior seems to be broken (I'm using scala 2.9.1) var b= new StringBuilder All right: b+='a' b.append('b') b.a…… -
How does Java choose which constructor to use?
I can't understand the output of the following program public class Confusing { private Confusing(Object o) { …… -
What has been added to Java – outofmemoryerror and how?
I have a very long collection with 10K project that crashes when running a toString () on an object I need to use this…… -
java. io. Is buffer * stream different from ordinary stream?
1) How do buffered streams work in the background, how are they different from normal streams, and what are the advant…… -
java – MainActivity. This is not a closed class asynctask
I tried to create an asynctask for the first time, but I didn't have much luck My asynctask needs to get some informat…… -
java – CopyOnWriteArrayList throwing CurrentModificationException
When I traverse a list, I occasionally get a concurrentmodificationexception Google search informed me that this may b…… -
Java – DBCP and Hibernate do not reopen the dead connection on spring. Why?
I am using hibernate and DBCP to manage MySQL connections, both in the spring project Everything is normal The only pr…… -
Java – string literals and permanently generated memory areas
When we say that the actual string is stored in the permanent generation area, the same applies to string text? Or is …… -
Determines whether the current thread holds Java ` lock`
Suppose I have a Java util. concurrent. locks. Instance of lock Can I determine whether the current thread holds a loc……