Recent questions tagged Java

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java - JavaFX 2.0 + FXML. Updating scene values from a different Task

I want to get the controller from a scene that i've loaded with FXMLoader. The use case is: My JSON manager ... in this case) Thanks in advance 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 - If key in hashtable is a class object, how does containsKey work?

When we put a class Object (that has say three data members) in a hashtable, how can I prevent putting ... work around this problem ? 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 - File Upload to Server Directory Using Spring MVC

I am trying to upload a file to the server directory from client machine. I used the following codes : FileUpload. ... wrong thing i have done?? 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 - Sort Intervals in Joda-Time

I have list of Joda-Time Interval objects. List<Interval> intervals = new ArrayList<Interval>(); How can ... The intervals are not overlapping 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 it possible to use JSP/JSTL to generate dynamic css/javascript files?

If so how do you do this? (jboss/tomact embedded/jdk 1.5) not embedded js/css but an actual file... 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 - Activity reloads when orientation changes in Android

When my main activity starts after the splash screen it parses 4 big XML files. This takes a few seconds and ... seem to understand the docs.. 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 - Multithreading transactions hanging during persisting entity to postgresql via wildfly

I've got a bean definition with an entityManager like this: @Stateless public class JPABean<T> { private static final ... ')" "idle in transaction";"select nextval ('hibern...

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

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java - Changing ImageIcon to another picture with button click

So I want to replace an ImageIcon in a JLabel every time a button is pressed. I made it so the image, label, and ... right go to next card } } } 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 to set KEX on JSch Session when using Apache VFS

I am using Apache VFS 2.1 with JSch 0.1.54 (latest versions today) to upload files using SFTP. ... : Disconnecting from z1t1brmxpta022 port 22 See Question&Answers more detail:os...

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

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630 views

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java - Get title, meta description content using URL

I am trying to extract title and meta tag's description content from a URL, this is what I have: ... wiki/google description earth.google.com See Question&Answers more detail:os...

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

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630 views

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java - How can I tell Dozer to bypass mapping null or empty string values per field using the programming api?

The faq explains how to do this in XML. This shows how to do it per class using the API. The problem is you ... on one field? Is this 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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java - How is the return-value of SessionContext.getBusinessObject() different from 'this' keyword used in the bean?

The SessionContext.getBusinessObject() is described in the docs as follows, Obtain an object that can be used to ... How are these different ? 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 - Which data type or data structure to choose to calculate factorial of 100?

I thought of writing a program to evaluate factorial of a given integer. Following basics I wrote the below ... C programming language or Java. See Question&Answers more detail:os...

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

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527 views

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java - Tab between fields in TableViewer

What I'd like to do is be able to tab between elements in table. I currently am creating my table like ... pointing to those would be great. See Question&Answers more detail:os...

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

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447 views

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java - What do I have to do to avoid error of "out of memory", when connection by jdbc with sqlite3 database?

What do I have to do to avoid error of "out of memory", when connection by jdbc with sqlite3 database? java ... ("jdbc:sqlite:clients.db"); 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 - I want to inject an object in servlet using Spring

I have a two servlets in my application and I want an object of class A to be injected to both the servlets, ... </session-config> </web-app> See Question&Answers more detail:os...

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

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642 views

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java - How can I extract images and their metadata from PDFs?

Is it possible to use Java to extract images from a PDF file and export them to a specific folder without ... ideas or examples are welcome. See Question&Answers more detail:os...

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

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573 views

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java - Does 'volatile' guarantee that any thread reads the most recently written value?

From the book Effective Java: While the volatile modifier performs no mutual exclusion, it guarantees that any ... or counter-example code. See Question&Answers more detail:os...

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

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981 views

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java - How register Broadcast Receiver for media button in Oreo?

I have a problem with the new Android version, that is 8.0 (Oreo). I have to register a broadcast and I do ... /> </intent-filter> </receiver> See Question&Answers more detail:os...

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

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581 views

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java - "Cannot make a static reference to a non-static method" in Android

I'm having some issues with the old "Cannot make a static reference to a non-static method" error in my ... of you with similar issues!! See Question&Answers more detail:os...

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

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439 views

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java - Simple Xml - Element Declared Twice Error

I have been trying to wrap a set of classes based on Simple XML (Java Serializer) around a RSS Feed. The ... still points to the same error. See Question&Answers more detail:os...

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

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732 views

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java - Add values to arraylist use JSTL

is it possible to add values to an ArrayList instead of using a HashMap something like: <jsp:useBean id="animalList" ... <set>: "null" thx See Question&Answers more detail:os...

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

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622 views

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java - Firebase No properties to serialize found with object in release mode

I've written a method for pushing real-time location data to Firebase: private void writeNewMarker(int sessionType ... serialize found on class See Question&Answers more detail:os...

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

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740 views

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java - How to get text from this html tag by using jsoup?

I meet a position when i using jsoup to extracting data. The data like this: This is a <strong>strong</strong> ... do that? Can anyone help me? See Question&Answers more detail:os...

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

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725 views

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java - Getting the following build error: "the type {---} cannot be resolved. it is indirectly referenced from required .class files"

So, I have the following setup in Eclipse (Java): I have a project (lets call this "project 1") which provides ... the most recent JDK etc... See Question&Answers more detail:os...

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

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632 views

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java - Reverse method reverses elements of a queue

This is not a HW or assignment. This is something i'm practicing myself. Given a queue, write a Reverse method ... isEmpty(); int size(); See Question&Answers more detail:os...

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

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505 views

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java - SSL for specific pages/url-patterns in tomcat

I recently configured tomcat 6 with SSL and client authentication, but the only way I could do it was modifying ... do it, please tell me. See Question&Answers more detail:os...

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

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1.2k views

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java - Race conditions "check-then-act" and "read-modify-write"

Anyone can explain me about what is race condition, how to avoid it, and how to find it out in java codes ... your knowledge with me:) 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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