Java
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Java – why Catalina home_ IS_ The undefined directory is generated by logback in the same project directory?
I wrote the logback configuration file for my application, but when I was doing Maven clean install (MVN clean install…… -
How do I use JNDI to pass parameters to an LDAP custom socket factory?
I am using JNDI to establish an LDAP connection Example: Hashtable env = new Hashtable(); env.put(Context.PROVIDER_URL…… -
Java – best practice for testing indexof return values
What do you usually write when testing the return value of indexof? if str.indexOf("a") < 0 VS if str.indexOf("a") …… -
Java – you cannot use expressions to increment byte values, but use the increment operator
See English answers > why byte + = 1 compile, but byte = byte + 1 not? 8 byte i=0; i++; The following is invalid by…… -
Strange behavior of Java scanner reading files
Therefore, I encountered an interesting problem when using the scanner class to read content from a file Basically, I'…… -
Java – starts the camera intent, but does not save the image
Is there any way to use the camera, but only save the image temporarily? I'm loading the camera using the following co…… -
Why Java Lang.void cannot be serialized?
By default, the primitive 'void' can be serialized. Why can't the object 'void' extend serializable? Add example: Root…… -
Populating an array with a common list using vendors in Java 8 throws classcastex B / C with type erasure
I want to use supplier and stream Generate populates an array with a generic list as elements It looks like this: supp…… -
Java – can ThreadLocal be safely used with Tomcat NiO connector
We thought of this when testing the Tomcat NiO connector during the load test I use ThreadLocal. In addition, I use sp…… -
Java – square retro fit client: how to enable / disable followredirects? How do I intercept redirected URLs?
I'm using square's Retro fit client to make a simple request from an Android application like this: RestAdapter restAd…… -
Java – convert resultset to excel (*. Xlsx) table using Apache poi
I'm trying to write the resultset to an excel (*. Xlsx) table using Apache poi Table object error in Office Excel inva…… -
How to use SQL Server Compact Edition (CE) of Java?
I want to access Microsoft SQL Server Compact Edition database from Java How can I do this? I searched the jdbc driver…… -
How do I get the current screen details in JavaFX?
I have multiple monitors connected to my computer I can get the home screen from JavaFX But I need to know the screen …… -
Recursive generic definition and stackoverflow in Java
I am writing implementations of deterministic finite automata for some research projects, and some arcs lead to the sa…… -
Java – is there a way for IntelliJ to warn me that this code may cause NullPointerException?
Is there any way for IntelliJ to warn me that this may lead to NullPointerException? URL resource = Main.class.getReso…… -
Java – is there any way to prevent hibernate from destroying Boolean text in @ where annotation?
I want to use the @ where annotation in hibernate to delete objects that have been marked "deleted" by the Boolean att…… -
JFrame retain() problem – Java
I want to be able to draw using java paint () on JFrame When I click on the JFrame (anywhere now), I want to redraw th…… -
How to use JUnit to get database connection in spring?
I am trying to use the correct logic of services and methods to test the correct information provided by dB In this si…… -
Java – string substitution in substring
I want to write a method for a Java class This method accepts the XML data string given below as input <?xml versio…… -
Java – observer mode with threads
I want to run several threads and join them at the end of my main method, so I can know when they are finished and pro…… -
Java – generates compiler warnings using user-defined annotations
Is it possible for the compiler to generate warnings when encountering user-defined comments? Something like the @ dep…… -
Java – how to handle exceptions of multiple routes
I'm mastering the spark framework, and I'm trying to understand the best way to handle exceptions in multiple paths At…… -
How to reduce the size of image file in Java
I want to reduce the image file size of uploaded images before saving to the server (to reduce loading time) How can I…… -
Failed to convert list to list in Java generics. Error
Here is my simplified diagram implementation import java.util.ArrayList; import java.util.List; public class TreeNode…… -
Calling order of overloaded methods in Java
I'm studying some Java exams. I've encountered this problem: //Write the output of this program: public static void m…… -
Automatic startup of java desktop applications?
I created a desktop application in Java using NetBeans 6.1 and created a jar file of the application Now I want it to …… -
With automatically generated classes Net ORM solution: subsonic, Castle AR?
I used to use custom data mapping libraries, and I'm trying to switch to a broader ORM solution After some experiments…… -
Java – why can’t @ safevarags be applied to instance methods in the final class?
According to the document of safevarargs, the @ safevarargs annotation can only be applied to static or final construc…… -
Unit test – parameterized JUnit test without changing the runner
Is there a clean way to run parameterized JUnit 4 tests without changing the runner, that is, without using I have uni…… -
Java – mapping multi-level inheritance in Hibernate
At present, I have such a structure: A | +--B | +--C It uses join tables to map one table per subclass For historical …… -
Java – jcombobox on JPopupMenu
I'm trying to use composite swing components as part of the menu Everything works well except for one detail: the comp…… -
Java – web client for Web Services
When I access it from a J2SE (desktop) application, I have a working web service To access this service, I will follow……