Java
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Java – how to understand Maven dependency tree
Please forgive me if this is a dump problem, but I searched a lot and didn't understand how to actually read Maven dep…… -
Java – the error message “attempt to split long or double on the stack” indicates?
The following error occurred in my code: I am ignorant of the origin of this error and do not know how to debug it Wha…… -
Java – how to create docker image files and value parameters for local applications
I have a Java application (jar file) that I want to be able to run from the dock image I created a docker file to crea…… -
How to configure Java imported organizations in NetBeans
At present, NetBeans (I use version 7.3.1) has the built-in function of organizing java file import through the menu s…… -
Java – deploying spring boot applications in Weblogic
I deployed a spring boot application in Weblogic 12C 10.4. 4 403 prohibit the server from understanding the request, b…… -
Java – “with private access” errors and generics
I have a problem I can solve myself, but I still don't understand why my original code doesn't work, or if there is a …… -
Java – is this object mutable?
If I have such a class: @ h_ 301_ 2@public class MyObject { private int myField = 2; public void setMyField(int f) { t…… -
Java – have I implemented equals and hashcode correctly using Google guava?
I am using hibernate and need to rewrite equals and hashcode () I chose to use Google guava's equals and hashcode assi…… -
Java – what about Dagger’s custom range?
How to create a custom range with dagger? Are there any guidelines? I didn't find them I am developing vaadin applicat…… -
java – WSContext. Getuserprincipal() returns null for password digest validation
In my web service, I need to record the caller's ID, but wscontext Getuserprincipal() returns null, even if the user a…… -
Java – comparison of positive and negative zeros
Why is java inconsistent when comparing - 0.0 and 0.0? What is the Java standard way to compare numbers to - 0 / 0? I …… -
Java – best practices for controlling access to “. Internal” packages
I write eclipse plug-ins and export some classes as APIs, while I want to restrict access to other classes I follow ec…… -
Java – the best way to compare enumerations
See the English answer > comparing Java enum members: = = or equals()? 16 Color c1 = Brown,c2 = Red What is the bes…… -
java. Lang.illegalstateexception: cannot perform this operation after onsaveinstancestate: – fragment error
Hi, I use segment a and the second segment B. call B and use the asynctask method, but I use this first time, it works…… -
What’s the difference between Java’s equals () and C’s operator = =?
When a question regulating the use of typeID is C, I suggest it can be used to compare types in objects I don't see it…… -
Java – does explicit locking automatically provide memory visibility?
Example code: class Sample{ private int v; public void setV(){ Lock a=new Lock(); a.lock(); …… -
Java error when combining Lambdas and multiple catch clauses?
import java.io.*; import java.io.*; import java.net.*; public class Test { …… -
How to specify the encoding of Java source files?
I used strange Unicode strings in java test cases The compiler seems to interpret the file as ISO - 8859 - 1, causing …… -
Java – jarscan, which scans all jar files of a specific class in all subfolders
We are seeing an older version of the class being used, although we have the latest deployment To scan all jar files i…… -
Java – the deleted entity is passed to the persistent exception
I have such entities: I'm just trying to delete a file, such as entitymanager Remove (file); However, an error occurre…… -
What is the preferred way to get the frame rate of a JavaFX application?
This is a very simple question: What is the preferred way to get the frame rate of a JavaFX application? Google showed…… -
Java – change string constants in compiled classes
I need to change the string constants in the deployed Java program, that is, compiled Class file It can be restarted, …… -
Java – bypassing generatedvalue in Hibernate
It is possible to bypass the ID of @ generatedvalue in hibernate. We have a case where we want to use generatedvalue t…… -
How to delete data using sets in Magento ORM?
Now I'm deleting data $deleteCCL = Mage::getModel('crossdata/customccitem'); $deleteCCL->load($itemId); $delete…… -
Java jar ant include folder
My question is: how can I put files into subdirectories into my jar through ants? Now my code is: <jar destfile="${…… -
Can two Java interfaces be mutually exclusive?
I have two interfaces that should be excluded: interface Animal{} interface Cat extends Animal{} interface Bird extend…… -
Java – log4j2 why log4j?
I must miss something, but now I've been watching it for a few days, but why can you use log4j2 (not performance) befo…… -
Java – JUnit test passed, but pit indicates that the suite is not green
When trying to run pit mutation test, I received the following error: When I do the normal test build, the tests run w…… -
Java – spring: exception start filter springsecurityfilterchain
I'm using spring 3.1 Write an application with 2 - release The app server is Tomcat 7 This is my profile: web.xml <…… -
Java – how to use GridLayout to set component size? Is there a better way?
I'm using java to develop a bigger GUI, and I'm getting angry with the layout manager I have a "settings panel" that c…… -
How do I change the default class loader in Java?
Suppose I have three classes, classA, example ClassB and example ClassLoader. ClassA prints out HelloWorld and ClassB …… -
What are the security implications of deserializing untrusted data in Java?
Can I safely deserialize untrusted data if my code has no assumptions about the state or class of the deserialized obj……