So I made a JPanel and a JFrame using the Design functions in NetBeans and when I try to drag the panel onto the JFrame, I get the error "The component cannot be instantiated. Please make sure it is a JavaBeans component."
What I did was create an empty Frame and then create the Panel and put it all together using the panels, buttons, and text fields. I didn't modify the source code or anything. Is there some kind of code I need to add into the panel to make it work with the JFrame? Or perhaps I missed a step in the design tab? I've included a picture that shows exactly what it is I made.
jpanel
Clean and build the project (and sub projects as required).
If you're using Netbeans 7+, you can check the messages.log found in C:/Users/{username}/AppData/Roaming/NetBeans/{Netbeans version}/var/log and check for the exception that caused the problem.
I think the new 7.2 beta reports the problems to the user now (thankfully).
Related
I am currently completely stuck with the following problem: I want an GUI with a cotrol panel at the right to type in some program parameters that should be used to draw multiple lines onto a graphic panel at the left side of my GUI. My approach was to use the Form Designer to arrange the Layout with all the Buttons, Lables and TextFields. Than I created a Class "GraphicPanel" that extends JPanel and I overrided the PaintComponent method of this class in order to draw the lines.
Now I want to add this custom created component via the form Designer to my UI. But when I try this via the Non-Palette-Component option: nothing happens and the component is not even shown in the hierarchy-tree. I have already serached the web for solutions and found that my class needs to be compiled and the ReloadCustomComponents-Button must be clicked after inserting custom stuff. My class is compiled but the ReloadCustomComponents-Button is not shown up in the UI-Designer Toolbar. I tried to configure the toolbar manually - and in the configuration setup Intellij is also listing the Button as a displayed icon - but it is not there when I apply the configuration. Did anyone had the same problem or does anyone have any suggestions what I can try or what else I can check out? I am actually wondering if this is a software bug or whether I missed something different. I am quite a beginner and especially working with UI's and Swing is new for me so I have no real idea how to go on with this. Thanks for any help!
(I am using Intellij Idea 2020.3.1 on Windows and JDK 15.0.1 and my output format for the UI-form code is set to binary class files)
UI component classes used in the UI Designer palette must be compiled for the same or lower Java target version as is used to run IntelliJ IDEA. IDE JDK version is available in Help | About dialog and is 11 for 2020.x IDE versions.
Change the target JDK version to 11 so that IDE can load the component classes. See this answer for the relevant places where JDK language levels are configured.
I'm beginner with Netbeans and GUI. I want to create JTabbedPane by click on one button and wants also that tabbed pane name will be the name of the button: I used this code but nothing appears!
JTabbedPane jtp1=new JTabbedPane();
jtp1.setVisible(true);
jtp1.addTab(jButton1.getName(), jPanel6);
I want also to add this tabbed pane to a panel and it will be the same size of the panel.
I highly recommend working through this tutorial from Oracle before you spend a lot of time figuring out how to make it work in netbeans. At some point you will have to understand what netbeans is doing to the code and why... it is a lot easier to get that info first and then use the IDE to help shortcut it then to try and figure out where in the mess of code the IDE generated you should start learning.
http://docs.oracle.com/javase/tutorial/uiswing/
I am trying to learn Java Swing with the aid of the Netbeans IDE. Following this tutorial, I find myself stuck when I try adding a Panel to a JFrame.
The Panel, or any other component from the Swing Container, does not add to my design view.
I have tried dragging and right-clicking the component without success.
When I right-click the Panel component, I get various menu options including "paste item" but it is greyed out and inactive.
Just click on the palette "Swing Containers" Panel button. In 7.2 and 7.2.1 it is a toggle switch. Then go to your JPanel and you will see your new JPanel moving along with your cursor. Move it to the location you want to have it and click again. Then you can resize it to the dimensions you like...
Netbeans IDE is an excellent production tool. If you are in the learning phase however, it is always better to avoid using powerful GUI-editors, in order to gain a better understanding of the concepts. You can do that using simple text editors.
You will find these links helpful: The Swing Tutorial, Java2s tutorial and Java Beginner Tutorial. And certainly you can ask Stackoverflow if you get stuck at some point, or want an opinion
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I have build an application using the Netbeans Wizard Framework as outlined here and here. I have my application working properly, but the problem I have is that the application does not show in the windows taskbar. I am pretty sure the problem is that the Wizard Framework uses a JDialog instead of a JFrame, but I can't figure out if that can be changed.
If anyone has experience with this framework, please let me know if it can be made to appear in the taskbar.
Changing is quite easy.
Open the form in NetBeans.
Change extends javax.swing.JDialog to extends javax.swing.JFrame.
Save the file and close it.
Reopen the file.
In designer mode, make a change. I usually just change the name of a component.
Save the file.
Undo the change and save the file again.
You should be all set.
Wizard Framework uses a JDialog instead of a JFrame, but I can't figure out if that can be changed.
don't use more than one JFrames, this's road to the hell, you cann't to setToFront, setOwner, iconify, etc ...
use JDialog or JWindow instead with parent to the one single JFrame
use undecorated JDialog, with setModal() or is possible to set various ModalityTypes too
If anyone has experience with this framework, please let me know if it can be made to appear in the taskbar.
this Swing Framework is long time depreciated
you can use SplashScreen repeatly instead of JDialog/JWindow
I'm trying to learn Java so sorry if this is a stupid question, but I seem to be unable to change the default close operation on my JFrame in NetBeans.
In NetBeans I created a JFrame and implemented some controls on it using the NetBeans GUI designer. However, I noticed that after I close the JFrame, my application would close even though I have another form that is supposed to appear afterwards.
After digging through the JFrame generated code I found:
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
From research it appears that this causes the application to close when the frame is closed. I would prefer to not have this happen. From looking around, it appears I either need to use DISPOSE_ON_CLOSE or DO_NOTHING_ON_CLOSE in order to get the window to close but still have additional code to run.
However, I can't figure out how to get NetBeans to change this value through the designer. I found the defaultCloseOperation in the Properties -> Bindings window, but every time I enter something into the text area and press enter my text disappears. The binding has an elipsis but I can't figure out what the binding window actually does.
How can I change my setDefaultCloseOperation() to a new value?
It is right there in the properties panel. Just make sure that the whole JFrame is selected. You can select your JFrame from Inspector panel.
Try to update defaultCloseOperation value from Properties -> Properties tab, not binding tab
If you open the file with a different editor (i.e. notepad) you will realize that netbeans puts some lines in the file to make specific sections read only.
You can always remove those lines, or even edit whatever you want with another editor.
You can always right-click on your frame, choose Customize Code and make your changes there.