Recent questions tagged Java

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java - Safely open and close modal JDialog (using SwingWorker)

I needed a way to get some data from a database and prevent the user from modifying existing data for that ... it will actually get closed? 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 know the file size when uploading via multipart form-data?

I am exercising a simple application with HTML client that uploads a file to the server and must display a ... bytes from please? 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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703 views

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java - How to find a duplicate class on the class path?

How do I find a duplicate class on the class path? Background: I suspect to have a duplicate class (javax.mail. ... is. I am using Eclipse. 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 - some error while running spring mvc project

Springsource tool suite is the tool am using. these are the errors.. > Description Resource Path Location Type ... to listener instance of class org.springframework.web.context.Co...

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

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650 views

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java - Spring JPA entities not saving to database

I am facing some issues in Spring JPA. I successfully configured the Spring JPA project and am able to run the ... employee); return false; } } See Question&Answers more detail:os...

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

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878 views

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java - Swing - paintComponent method not being called

i simply implemented class that inherits JPanel like below public class Orpanel extends JPanel { .... @Override public ... Orpanel is same :) See Question&Answers more detail:os...

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

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962 views

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java - Reading double values from a file

I'm trying to read some numbers (double) from a file and store them in an ArrayList and an array (yes, I ... loop isn't executed a single time. See Question&Answers more detail:os...

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

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859 views

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java - Make JCheckbox bigger..?

i want to make my JCheckboxes in a JTable bigger (for Touchscreen), but it doesn't change the size. I tried it ... setSize What should I do?.. See Question&Answers more detail:os...

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

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660 views

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java - Loading JDBC Driver at Runtime

I'm using the following code to load a driver class: public class DriverLoader extends URLClassLoader { private ... can I fix 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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java - How to set fixed width but dynamic height on JTextPane?

I want to use a JTextpane with fixed width but dynamic height which should also allow wrapping. The height should ... to go about this problem? See Question&Answers more detail:os...

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

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999 views

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java Cannot delete file, being used by another process

I have this code import org.apache.commons.io.FileUtils; try { FileUtils.copyURLToFile(new URL(SHA1_LINK), new File(" ... How can I 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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943 views

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java - "non-static variable this cannot be referenced from a static context"?

I'm a Java newbie and I'm trying to deploy a fibonacci trail through recursive function and then calculate the ... what is the problem?! See Question&Answers more detail:os...

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

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707 views

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java - Removing Default JButton input map

I am having some trouble removing the default input map information on my components in a java swing application ... block? Thanks beforehand. See Question&Answers more detail:os...

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

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648 views

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java - Keeping the session Open in JUnit/JPA/Hibernate/Struts and Spring integration test - No Session or session closed - LazyInitialization Exception

My application uses Struts2(mvc), Spring (Dependency Injection), JPA with Hibernate, JUnit along with struts2-junit ... or setup this filter? 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 write JPA query where parameter is a set?

Assuming the following class, how do you find a Person with a particular email address? public class Person implements ... where p.email=:email See Question&Answers more detail:os...

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

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795 views

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java - Bytecode Scanning error on META-INF/versions/9/* and Elasticsearch 6.2.2+ with Jetty 9.2

Running GWT app in the Superdev mode with the latest versions of Elasticsearch (above 6.1.1) creates the ... .configure(WebAppContext.java:479) See Question&Answers more detail:os...

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

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535 views

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java - Using Jersey's Dependency Injection in a Standalone application

I have a interface here interface Idemo{ public int getDemo(int i); } And it's one implementation class DemoImpl ... web class using Jersey DI ? See Question&Answers more detail:os...

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

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599 views

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java - JTable Nimbus Look and Feel - how to make it clear which cell has focus

When editing data in a JTable (Nimbus L & F), as the user tabs from cell to cell, it is not obvious ... UIManager.put("Table.showGrid", true); See Question&Answers more detail:os...

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

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719 views

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java - setUndecorated(true) to a JDialog created from an instance of JOptionPane

I currently have a JDialog created by calling the createDialog() method from my instance of JOptionPane: JOptionPane pane ... ); dialog.show(); See Question&Answers more detail:os...

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

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682 views

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java - Short hand assignment operator, +=, True Meaning?

I learnt that i+=2 is the short-hand of i=i+2. But now am doubting it. For the following code, the ... more than I know. Please enlighten 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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765 views

1 answer

java - Swing timer persistence after main method finishes

I am trying to create a program to perform a simple task and produce an output every x seconds. I also ... than using Swing timers. 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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743 views

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java - Issue about casting object brackets

I have noticed that there are two ways to cast objects (the difference is the placement of the outer parenthesis) ... doing the same thing ? See Question&Answers more detail:os...

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

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773 views

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java - Is it OK to use AWT with JavaFx?

I need some functionality that I cannot find currently in JavaFX. Like the Robot or the Tray Icon. I know these ... that I should care of? See Question&Answers more detail:os...

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

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717 views

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java - Why is File.pathSeparatorChar a semicolon on Windows?

The javadoc states that File.pathSeparatorChar is: The system-dependent path-separator character. This field is initialized to ... , such as |. See Question&Answers more detail:os...

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

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528 views

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java - NoClassDefFoundError ProcessingException while migrating from jersey 1.x to jersey 2.x ( 2.8 )

I developed a web service application which was working fine with jersey 1.x ( 1.16 ) I recently tried to ... jersey 2.8 works 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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704 views

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java - Play Framework 2.2.1 - Compilation error: "method render in class index cannot be applied to given types;"

I am new to Play Framework, and attempting to build a Todo-list from this manual. When I try to run the ... return new ArrayList<Task>(); } See Question&Answers more detail:os...

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

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821 views

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java - Firestore - Why check if DocumentSnapshot is not null AND call exists?

Take a look at this code example from the Firestore documentation: DocumentReference docRef = db.collection("cities ... for nullity 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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635 views

1 answer

java - Can I apply a time limit for all the tests in the suite

Is there a way in JUnit to define a global timeout/limit for all the tests included in the suite. Well, let ... but none of the tests failed. See Question&Answers more detail:os...

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

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