Java
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Java settings have multiple equality criteria
I have a special request. I need to delete the object list repeatedly according to the combination of equal standards …… -
Java – hibernate manytoone n 1 select id
N 1 select query I encountered a strange problem My mapping looks like this: @Entity @IdClass(MyTablePK.class) @Table(…… -
Java – how to export the DDL of all objects (such as tables, indexes, etc.) in Sybase IQ / Sybase ASE without using any tools?
I've created a sample program, and I want to use get_ The DDL method obtains the DDL of all objects, such as table, tr…… -
Multithreading – multiple UI threads on the same window
I don't want multiple windows. Each window has its own UI thread. I don't need to raise events on a single UI thread i…… -
Java – how to enable reasonable default caching for public files in Grails 3 applications?
I have a Grails 3 application with images, CSS and JS files under Src / main / resources / public These use the 'no ca…… -
Java – repeated input errors when using POI with gradle
I started a project that needed the Apache POI library I pasted them in my build Everything seems to be fine in the gr…… -
Java – one to many one-way parent-child ID cascade saving
When I try to save the ID from the parent class to the child class, I keep getting errors I tried all types of mapping…… -
When a decimal point is given, the Java program crashes, but int is used
When the user enters an integer, the program runs smoothly, but when the user enters the last decimal number, the prog…… -
How to substring a string to the second point (.) in Java?
I have a string with many segments by dots (.) Separate as follows: I want to get a substring up to the second point, …… -
Java – handling 401 errors (spring security)
I can handle 404 errors @ResponseStatus(value = HttpStatus.NOT_FOUND) @ExceptionHandler(NoHandlerFoundException.cl…… -
Java – bubble sort 2D array
I need to build a bubble sort 2D array code The trick here is that I can't use the one-dimensional array helper or mov…… -
Java-8 – disadvantages of the javac – parameters flag
I want to try some framework functions that require parameter names at run time, so I need to compile my application w…… -
JavaFX tableview does not display content
I'm trying to insert some values in tableview, but it doesn't display the text in the column, even if they are not emp…… -
Java – sqlnestedexception: unable to create poolableconnectionfactory (user ‘< >‘ @ ServerIP ‘denied access (use password: Yes))
I have an openshift site that tries to connect to an external MySQL server Here is my code so far public class BaseDAO…… -
Declare the initial value of BigDecimal array in Java
I want to declare a BigDecimal array with an initial value of 0, as follows: BigDecimal[] val = {0,0}; But it doesn't …… -
Multithreading – I don’t understand multithreading programming
Someone can explain to me how a multithreaded application can be faster when a core CPU can only do one thing at a tim…… -
How to convert an existing Java Import class file into Android studio project
I need to know how to convert existing Java The class file is correctly added to the Android studio project My goal is…… -
Java – repeated input errors when using POI with gradle
I started a project that needed the Apache POI library I pasted them in my build Everything seems to be fine in the gr…… -
Java – delete the lowest bit
Given a binary number, what is the fastest way to delete the lowest bit? 01001001010 – > 01001001000 It will be use…… -
Java – static variables, patterns and Android performance
I am doing some major refactoring operations. Compared with some performance improvements in Android applications, it …… -
Java – duplicate resource error using Duplicate Finder plug-in
I have a project consisting of many subprojects Consider the three modules a, B, C. B depends on a and C, depends on a…… -
Java – use Jackson JSON parsing to convert true or false to Boolean values
I'm using the Jackson annotation to parse the JSON response into a POJO object I use Boolean variables in POJO to map …… -
Why am I on 1.8 0_ 45, Java Lang. nosuchmethoderror: createimageusingnativesize error
In some cases, the code used to process a single image dragged and dropped from some webrowsers (Firefox) is in 1.8 0_…… -
Java cannot find method main
I have a simple hello world plan trouble ha ha! I hope someone can understand this Therefore, the errors received are …… -
Java – type set is not universal; It cannot be parameterized
My eclipse faces this strange problem Type set is not universal; It cannot be parameterized with the parameter < in…… -
Java – manage MySQL partitions using hibernate
We are currently evaluating the use of MySQL partitions for our small applications The application is basically at the…… -
Java – JPA onetomany list cannot find mappedby attribute that should be inherited
We are currently making some requirements. We must add some similar entities (car pictures, pet pictures, holiday pict…… -
Java – access modifiers and methods for superclass references [copy]
See English answers > understanding Java's protected modifier 6 package pet; public class Dog { protected void…… -
Java – simulation server for spring OAuth endpoint
I'm trying integration testing to see how my registered endpoint behaves when it fails My registered endpoint is an AP…… -
Java – Grails overrides default email authentication
I found that Grails authentication also rejected some valid email addresses I opened a question on GitHub here Is ther…… -
Java – matrices does not work in OpenGL
I am trying to create an orthogonal matrix and an appropriate model and view matrix to view a simple triangle just to …… -
Java – generics: input variables?
In order to be able to replace a specific implementation, it is usually known to write List<AnyType> myList = ne……