Java
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What is a good free tool for investigating unintentional object retention in Java?
My multithreaded Java program crashed because it ran out of heap space. I don't think it should Assuming that criminal…… -
Java – create a response using the location header in jax-rs
In NetBeans, I automatically generate classes with restful templates from entities and crud functions (annotated with …… -
Connection between Java string and operator
I'm confused about string connections String s1 = 20 + 30 + "abc" + (10 + 10); String s2 = 20 + 30 + "abc" + 10 + 10; …… -
Java – ehcache does not delete elements from memory during eviction
> ehcache 2.5 maxEntriesLocalHeap="10000" eternal="false" statistics="true" overflowToDisk="false" timeToIdleSecond…… -
Java – error: unable to initialize module treewalker – unable to instantiate junittestcase
After importing Maven project into eclipse Luna, the following error will pop up when saving after modifying the metho…… -
Java – how to initialize BigInteger after creating an instance (constructor cannot be called)
Imagine an instance of BigInteger, so how do you initialize it after you create it? For example: BigInteger t = new Bi…… -
Java – interfaces and concrete classes
Below I have a person interface, an implementation class and a driver class, which initializes person with a name and …… -
Java – create a directory, if it does not exist, and then create the files in that directory
The condition is that if a directory exists, you must create files in that specific directory and create a new directo…… -
Using “forbidden” classes in Java?
My employer needs an extension org eclipse. rse. core. subsystems. The Java class of subsystem for eclipse plug - ins …… -
Java – use the super keyword in subclasses to access private fields of superclasses
For coding projects, I have a class that contains nested classes Nested classes subclass in the same external class It…… -
Java – generics and classes >, EnumSet. allOf(class)vs class. getEnumConstants()
I have the following beanvalidation code that works properly and allows you to validate a bean annotation with: @EnumV…… -
Java – jcombobox itemstatechanged event is called twice at a time
@H_ 419_ 2@resultCombo = new JCombo@R_611_2419 @(); resultCombo. addItemListener(new ItemListener() { @Override public…… -
Java annotation values are provided dynamically
I want to provide comments for some values generated by some methods I've tried so far public @interface MyInterface {…… -
Java – passing subclass instances as superclasses using JAXB
I have a set of Java classes representing message types (close to 25) They all inherit the message class that they wan…… -
Java – is it OK to add the default implementation to the method representing the listener’s interface?
A library is used in my project This library has an interface with about 15 methods The purpose of this interface is t…… -
Strange default method behavior with different Java versions
Suppose I have the following class hierarchy: interface Collection<E> { Collection<E> $plus(E element)…… -
Java – annotation processor – how to get the class it is processing
I'm trying to write a custom annotation processor public class AnnotationProcessor extends AbstractProcessor { .....…… -
How do you feel about JavaFX?
I have done a lot of work in ActionScript 3.0, and I also like programming in Java Is JavaFX right for me? What is the…… -
Java – what happens to its iterator when I sort a list?
Suppose I have a list object and an iterator for that list Now I use Java util. Collections. Sort() sorts the list >…… -
java – Thread. Getid() global uniqueness problem
If multiple Java applications are running on the system, each thread ID is unique relative to all other Java threads, …… -
Java – could ThreadLocal be useful?
So I just saw someone try to use a ThreadLocal < atomicinteger > in some java code And it always seems useless: …… -
java – WebSphere 7. Inject EJBs from another application
I tried to inject EJB with @ EJB annotation: >When I inject an EJB into another EJB in the same ear, it works norma…… -
Java – dynamic change persistence unit – JPA
persistence. The persistence unit in XML is created during the construction of the application Since I want to change …… -
Zero padding and left padding integers in Java (non decimal format)
Has been answered for integers printed in decimal format, but I'm looking for an elegant way to do the same with integ…… -
Java – unable to create eclipse data source to Oracle 12C. Jar But 11g’s work
When I open the data source Explorer window and try to create a new connection profile, I select "oracle", Oracle thin…… -
Java GetClass () returns a class. How can we get a string?
When I use system out. Println (obj. Getclass()) it doesn't give me any errors Return a class type from getClass () as…… -
Java – Eclipse: hover and disconnect from the debugging Perspective
Due to the upgrade of eclipse (Galileo build 20090920-1017), the value of the variable is no longer displayed in hover…… -
Java – PDF report with embedded HTML
We have a Java based system that can read data from the database, merge various data fields with preset xsl-fo tags, a…… -
Set your own class as the key in Java HashMap
I have a class that I want to set as a key in HashMap I have implemented the CompareTo method of this class But when I…… -
Is time regression enabled in Java 9 EA?
I've heard of it >Each major version of the JVM becomes faster (in some ways) > 9 modularity will lead to faster…… -
Should I manually implement the spring data warehouse method using the Java 8 default method?
When using the new spring data Evans distribution, I'm glad to use some good things to use with Java 8 One is the defa…… -
Java – streaming audio from PC to smartphone?
For Christmas 2016, my father and I want to make a light for our community with lights and music We have light setting……