Recent questions tagged JAVA

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java - How to turn off logging from slf4j

It's a third party application generating huge amounts of logentries on our appserver. Like this: [03.03.10 ... website didn't help either See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I get the @RolesAllowed annotation to work for my Web application?

I am making a Web application using Backbone.js, Bootstrap, NetBeans IDE 8.0, Java EE 7, JDK 8, WildFly server ... Final.jar:1.0.15.Final] at io.undertow.security.handlers.Securit...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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254 views

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java - Type mismatch for Class Generics

I have the following code that won't compile and although there is a way to make it compile I want to ... cast warning and runs perfectly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is OOP & completely avoiding implementation inheritance possible?

I will choose Java as an example, most people know it, though every other OO language was working as well. Java ... use code in an easy fashion? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I convert a StringReader to a String?

I'm trying to convert my StringReader back to a regular String, as shown: String string = reader.toString(); ... in reading the string back? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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463 views

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java - Eclipse JDT: Is there a refactoring to replace direct field accesses with setter/getter methods?

I know I can generate setters and getters for fields in the Eclipse source menu, but I'm very surprised ... manual search and replace? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - convert two-dimensional array to string

I'm trying to convert a String[][] to a string for display in a GUI. Here's my code: String[][] ... How can I get something more readable? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - NullPointerException | `this` inside enum constructor causing NPE

public class Test { public static void main(String[] args) { Platform1 p1=Platform1.FACEBOOK; //giving ... the object is constructed? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Return file from Spring @Controller having OutputStream

I want to return a file from a Spring controller. I already have API that can give me any implementation of ... user, how to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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327 views

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java - Difference between preference and shared preference in Android

The concept of preferences and shared preferences in Android are mixed up for me. What is the difference? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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266 views

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java - Spring cache all elements in list separately

I'm trying to add caching to a CRUD app, I started doing something like this: @Cacheable("users") List< ... a collection as individual keys? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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591 views

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java - why does Files.probeContentType return null

i am using java se7 on mac, the oracle preview. My problem is that "Files.probeContentType" returns null...is it ... Unis-path(id:145)" is red See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - H2 postgresql mode seems not working for me

my application accesses Postgres database and I have many predefined queries (Rank,Parition,complex join etc) I ... to fire Postgres queries. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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290 views

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java - Check if back key was pressed in android?

Say I'm on my main activity and I start a new activity MainActivity > NewActivity And from NewActivity I press ... know if this is possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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220 views

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java - What's the meaning of the '&' character in the returned value?

public static <T, U extends Comparable<? super U>> Comparator<T> comparing( Function<? super T, ? ... Serializable) Thanks for your help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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182 views

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java - How to configure additional classpath in SpringBoot?

I want to make a standalone web application. I have some problems with SpringBoot. My application is one jar ... SpringBoot. Is it available? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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396 views

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java - TestNG by default disables loading DTD from unsecure Urls

I'm using testng maven and selenium to run my tests, currently I have the following testng.xml ... resolveEntity(TestNGContentHandler.java:102) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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293 views

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java - How to get NumberFormat instance from currency code?

How can I get a NumberFormat (or DecimalFormat) instance corresponding to an ISO 4217 currency code (such as " ... to a NumberFormat instance... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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160 views

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java - Using Lists Instead of Decorator Pattern?

A Decorator Pattern use case from "Head First: Design Patterns" book made me have this question. I'll try to ... to know and discuss it further. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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441 views

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java - Spring prototype beans in combination with singleton beans and dependency injection. Is there an approach that is configuration only?

I have a singleton bean which needs for each call of a function to return a reference to a different (new) prototype ... protoBean"); } .... } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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250 views

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java - How to disable pom.xml validation in IntelliJ IDEA

I'm using buildnumber-maven-plugin to get Mercurial changeset as project build number: <plugin> <groupId>org ... Server VM by Oracle Corporation See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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550 views

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java - Spring data save vs saveAll performance

I'm trying to understand why saveAll has better performance than save in the Spring Data repositories. ... transactional batching internally? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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279 views

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java - Swing: set JFrame content area size

I'm trying to make a JFrame with a usable content area of exactly 500x500. If I do this... public MyFrame( ... titlebar. How can I achieve this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.6k views

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java - Content type 'multipart/form-data;boundary=----...;charset=UTF-8' not supported

I want to send an object to the controller that has several lists with files and several fields with plain ... no multipart boundary was found See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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593 views

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java - How to convert an address from IPv4 to IPv6

Is this possible? How can you convert an ipv4 to an ipv6 address? a few example from here: 0.0.0.0 -> ... searching a solution in Java. Thanks, See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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321 views

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java - GCM unregister causing the application to crash

I've implemented GCM notifications on my app. I am now trying to un-register the app when the user logs out. I ... ()); e.printStackTrace(); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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216 views

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java - New features in JDK 1.6 and 1.7

I know JDK 1.5 pretty well. As we all know, besides new API (such as AtomicInteger, for example), there ... Changes, but it is incomplete list. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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239 views

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java - Is it possible to have an interface method defined with a generic return type and a concrete implementation define the return type?

I have would like to create an interface: public interface OperandValue { <T> T getValue(); } I would then ... get this to work if possible. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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