Recent questions tagged java

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java - link between private key and signed certificate in keystore

I am doing the jetty SSL configuration. I have created CSR using keytool which has added a private key to ... to establish chain from reply 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 - Can't add image using ImageIcon to jTable cell

I trying to add image using ImageIcon class to jTable cell , but i get in the cell sun.awt.image.ToolkitImage@196a4632 ... ); frame.add(jps); } 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 - Array of Classes NullPointerException

This is Element class: public class Element { private String elementName; private int atomicNumber; private String Symbol; ... able to 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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java - How to make an make a web request in an async manner

I need to make a web request to a RESTful server from Java. I would like for my Java code to handle ... looking for a callback upon completion. 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 - Selenium implicit and explicit wait, timeout exception element not found

I am new to selenium (but experienced java developer). I am using something like below: WebElement searchBasket = ... wait as well? Please 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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java - What can break an android build without code changes?

I am working on a react-native app that uses react-native-firebase. I've setup a CI build on travis ... only causes further (different) errors. 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 - JLabel won't show with JPanel.setLayout(null). Why?

I want to show many different labels over a map, so I'm using null layout in my panel, and calling setLocation for ... (); } }); } } 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 can I tell Selenium to press cancel on a print popup in Chrome 75?

I have been using the the suggested solution from : https://stackoverflow.com/a/41670021/4633408 And it worked ... property 'shadowRoot' of null 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 - JavaFX: Running a Task in a separate thread doesn't allow anything else to run

I need constant data updating in my program, so I thought that through the use of JavaFX's Task that I would ... this and not run like intended? 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 - Bug in using Object.clone()

I have the next scenario: I define an int[][] variable in my main class. int[][] matrix1 = new int[10][10] ... confused as it's not working :(. 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 - Adding ChartPanel to CardLayout

I have a pretty basic GUI organized with a GridBagLayout. The most complex portion is the bottom where West is ... frame.setVisible(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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java - ObjectInputStream/ObjectOutputStream work not right

I have classes: Client, Server and Background is working with Player class. I really don't understand why my ... .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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java - Simple Swing Delay

In a swing application, I have a popup jDialog which pops up with a jlabel that says "Hang on 5 seconds." After ... out what I need to 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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java - Unable to get CallableThread in RejectionHandler

I have thread pool, which will take Callable worker thread with a RejectionHandler. I need to get this ... in getting WorkerThread 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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java - No marker displayed on the map in my route tracking activity with Google Play Services version 9.0.83

In the following code the content of my if(map!=null && mapIsReady==true) {...} in my updateLocation ... .android.gms.maps.SupportMapFragment" /> See Question&Answers more detail:...

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 - Using DateTimeFormatter on january first cause an invalid year value

When i'm using a DateTimeFormatter (code bellow) on a LocalDate set to January 1st 2017 i am ending with a ... any idea why this is happening? 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 - Using abstract factory with Spring framework

I have some Abstract Factory public interface AbstractViewersFactory { IAbstractShapeViewer createRectangle(BaseOperationsListener< ... 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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121 views

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java - How to set content-length in android?

I want to get content size by request.getContentLength() in server client JSP page. But request.getContentLength() ... )); conn.connect(); 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 contents are made translucent in a JPanel?

I am confused regarding the display of components in a JPanel. Suppose if I create a custom JPanel with ... Swing's painting mechanism.) 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 - Display file(s) name and select it under the folder in JTree

I managed to come this far using stackoverflow examples, JTree displays all the system drives and folders, wanted to ... worker.execute(); } } See Question&Answers more detail:os...

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

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168 views

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java - Drag and Drop with JTable on Mac OS X

i have a problem with DnD and JTable on macs. If you start the following program and click (fast) around in the table, ... (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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java - GridBagLayout is not working

this.rootComponent.setLayout(new GridBagLayout()); GridBagConstraints gbc=new GridBagConstraints(); //gbc.gridwidth=2; gbc. ... how to fix it? 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 - facing trouble launching spoon.sh on amazon ec2 linux

I am quit new to linux and Amazon EC2. i configure JAVA_HOME by following below two link How to know ... suggest that what is wrong? See Question&Answers more detail:os...

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

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278 views

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java - tomcat8 at 100% cpu when trying https on port 80

When trying to connect to tomcat 8 using https://localhost:8080/ tomcat get stuck at 100% cpu with ip - - ... to fix the 100% cpu utilization See Question&Answers more detail:os...

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

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133 views

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java - Service times directly proportional to number of threads

My system is i5-Dual core with hyper-threading. Windows show me 4 processors. When i run a single optimized cpu ... Service Time(ms)=10.272689 See Question&Answers more detail:os...

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

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309 views

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java - Overriding toString method

I am using .toString to return a string representation of an object, i.e. jcb.engineMove(move.toString()); will ... get the text of the object? 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 - Collision detection only works when object hits right in the centre

Hi so i have here a 'falling' style game where i have homer simpsons head falling through the sky avoiding the ... }// end of alien 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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java - Json object returning null against given key

I'm trying to read JSON from string (obtained from web), but it returns null. Specifically, result.append(name ... Thanks for Sufian and Ved! See Question&Answers more detail:os...

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

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