Recent questions tagged java

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java - javax.ws.rs.NotFoundException: Could not find resource for full path with RESTEasy and Wildfly 8.1.0.Final

I am facing following problem. I have spent more than 3 days on this but cannot find a ... undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [u...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - try catch exception always returns null

I got problem with Android. I develop on device and have problem with catching exceptions. I'm running some code in ... isn't null anymore... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Inject HttpServletRequest into Controller

As I know per default are controllers in Spring MVC singletons. HttpServletRequest passed offen to the controller ... into a singleton? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Does the JVM give back free memory to the OS when no longer needed?

I have an application that temporarily needs some certain amount of memory/heap for some processes. Given a ... when not needed anymore. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Jackson filtering out fields without annotations

I was trying to filter out certain fields from serialization via SimpleBeanPropertyFilter using the following ( ... use Jackson annotations. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring Controller to handle all requests not matched by other Controllers

I have a series of Controllers with Request Mappings that match certain URL's. I also want a Controller that ... way to achieve this behaviour? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Migration to JDK 11 + JavaFX 11 giving RuntimeException

I've got an application on Java 8 + JavaFX that I want to migrate to Java 11. The basis aim is to give a .jar ... must?). Any idea to fix that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Programmatically Turn Off USB Storage on Android Devices

On many android devices, when the device is plugged into the USB port of a computer or even on some USB ... g., Android: Detecting USB). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Gson, JSON and the subtleties of LinkedTreeMap

I've recently started playing around with JSON strings, and was told that Google's own library, Gson, is the new and ... ); ... print out null? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - BigInteger to byte[]

I need to convert a Java BigInteger instance to its value in bytes. From the API, I get this method toByteArray(), ... to get a byte[16] array? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Block scope variables

This will compile class X { public static void main(String args[]) { { int a = 2; } { int a = 3; } ... the same name of one in the outer block? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is there a way to obtain the bytecode for a class at runtime?

In Java, is there a way (at runtime) to obtain the bytecode which defined a particular class? Put another ... prefer a more canonical solution. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Invalid escape sequence d

I'm trying to check if a password contain at least one lower case letter, one upper case letter, one digit ... with a string like Paul%88 why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is there any instruction reordering done by the Hotspot JIT compiler that can be reproduced?

As we know, some JIT allows reordering for object initialization, for example, someRef = new SomeObject(); ... caused an unsafe publication. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - ZonedDateTime with MongoDB

Trying to use ZonedDateTime with MongoDB. I'm able to save ZonedDateTime in MongoDB but when i look at ... getMongoDbFactory(), converter); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - assign instance field to local variable

This is keySet() method on HashMap class from JDK. Why did the author assign the field keySet to local variable ks? ... KeySet()) : keySet; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JSCH - Invalid private key

I am running JDK 1.7 & Windows 7 using netbeans 7.2 I have generated a SSH private & public key pair (SSH2- ... e) { e.printStackTrace(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Dynamic vs XML layout in Android?

I'm new to Android development and have started creating my own UI. I see that you can either create it ... XML layouts in Android development? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to send and receive JSON data from a restful webservice using Jersey API

@Path("/hello") public class Hello { @POST @Path("{id}") @Produces(MediaType.APPLICATION_JSON) @Consumes(MediaType. ... -stream, was not found See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Displaying a number in 2 point decimal format in jsf

I am using JSF 2 and RichFaces 3. Here in the picture shown below, numbers are being displayed as what they are in ... and how can I solve it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Bug or feature: Swing default gui font incorrect for Win6+

just (astonishingly ;-) noticed the reason why apps look so cramped on my win6+ machines (same for Vista and ... to scale your icons as well See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - what is the difference between ? and T in class and method signatures?

why does public interface ArrayOfONEITEMInterface <T extends ONEITEMInterface>{ public List<T> getONEITEM(); } ... and method signatures? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Jersey + Json media type application/json was not found

I am trying with simple Jersey + JSON example but I get following error message body writer for Java class com. ... I am doing something wrong. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - TimeZone.setDefault changes in JDK6

I just noticed that JDK 6 has a different approach to setting a default TimeZone than JDK5. Previously the new ... { defaultZoneTL.set(zone); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How does marking a variable as final allow inner classes to access them?

An inner class defined inside a method cannot access the method's local variables unless these local variables ... different fields/variables. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Failed to change locale for db '/data/data/my.easymedi.controller/databases/EasyMediInfo.db' to 'en_US'

In my Android application there is a pre-defined database which is in the assets folder. I've created a table ... and how can I fix it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to launch JUnit 5 (Platform) from the command line (without Maven/Gradle)?

I'd like to run a class containing JUnit 5 tests from the command line. Unfortunately, I have some outside dependencies ... 0).getAge()); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring-Boot @Autowired in main class is getting null

I want to connect to a Sonic Broker Topic and Listen for any incoming XML message. I did something like ... .lang.Thread.run(Unknown Source) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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