I have problem importing import "javafx.util.Pair" into my program.
after searching the net I've found this answer cannot resolve symbol javafx.application in IntelliJ Idea IDE and I've installed desired jar file but still I've problem to import.
this is what I face to when open java jdk.
I don't know the why the "jfxrt.jar" is different.
note the black arrow on the folder icon
open the File | Project Structure dialog, there under Platform Settings select SDKs and then your JDK 1.8. On the right you then see all the jars that make up the classpath to your SDK. Make sure that your jfxrt.jar is in that list, if not, you can add it by clicking the '+' button at the bottom.
Update May 2020
JavaFX is no longer part of the Oracle or OpenJDK default distributions. Instead it is available as a seperate library or module set.
For instructions on using JavaFX in your application, see the documentation at:
https://openjfx.io
For instructions on working with a modern JavaFX installation and Idea, also see the related question:
IntelliJ can't recognize JavaFX 11 with OpenJDK 11
You don't need to "install the desired jar" (whatever that means).
You don't need to do that for JavaFX. You should not do anything explicitly with jfxrt.jar either in the filesystem or by adding it to a project classpath. If doing something on the filesystem, that is especially bad as jfxrt.jar is not made to be standalone and requires related native libraries shipped with the JDK in order to work.
The JavaFX code should be part of the JDK installation you are using. Perhaps you are using a Java version below 8 or an OpenJDK implementation that does not include JavaFX. If so, then install the Oracle JDK 8+ and set idea to use it. Everything should just work then and all of related JavaFX imports will resolve.
Related
We want to use both SWT and JavaFX in an Eclipse plugin within our RCP application. Unfortunately, we're experiencing problems integrating SWT with JavaFX under Java 11. The build environment uses e(fx)clipse 3.5. We're developing against the Community edition of Azul Systems' "Zulu" JDK 11, bundled with Azul's version of OpenJFX.
Formerly, we developed under Java 8. At that point, our build used a compile-time class path referring to jfxswt.jar, which lived in the jre/lib directory of the JDK. We didn't use any special class path settings at run-time.
We are now trying to move to Java 11. There, this JAR has become javafx-swt.jar and lives in the lib directory of the JDK. It no longer seems to be enough to set the class path to refer to this JAR at compile time: it seems to be necessary to do so at run time too. If we don't do this, we get an error (java.lang.NoClassDefFoundError: javafx/embed/swt/FXCanvas).
As a test, we experimentally embedded javafx-swt.jar within the JAR implementing our Eclipse plugin. We then referred to it in that plugin's .classpath file, and the code worked as expected. Unfortunately, we can't embed the JAR this way for legal and other reasons.
A note on Java modules: javafx.swt does not show up in the output when we issue the --list-module command. We tried running the application using parameters -p /path/to/JDK/lib/javafx-swt.jar --add-modules javafx.swt, but this doesn't seem to solve the problem.
My question: Is there a way to set up the class or module path to allow our Eclipse plugin to find this library in the JRE? Any solution would have to work with whatever JRE the code happens to be run against (I think it is all right to assume lib/javafx-swt.jar will live in that JRE).
Would it help to use a separately-downloaded version of OpenJFX rather than the copy of OpenJFX in our JDK?
Very many thanks ☺
I'm trying to run a program that uses the JavaFX scene object TextInputDialog. For some reason, it doesn't allow me to import javafx.scene.control.TextInputDialog (says "cannot be resolved").
I'm new to JavaFX, but here is what I tried. I thought it was my Java version, so I updated to the latest (1.8.0_91). I'm using Eclipse Neon 4.6.0. To install JavaFX it used the "install new software" option in the help menu, and put in the link found in step 4 of this: https://www.eclipse.org/efxclipse/install.html. After that, most of the JavaFX functions worked by adding the requisite import command. But this one doesn't.
I also found that some people have included the JavaFX library in the build path. I didn't change anything when I did that (though I'm not sure exactly what that would do since I already installed JavaFX in Eclipse).
Anyway, any suggestions would be very welcome. Thanks!
You need to make sure that eclipse is using the newer JRE for this project. You can do this by going to Project > Properties > Java Build Path and selecting the newer JRE from the list. I believe it needs to be 1.8.0_45 or newer.
I decided to learn JavaFX. I need to browse source code of classes like javafx.scene.layout.StackPane .
So I pressed F3 to go to source code. There is no source code and no button that allows to attach source code.
I looked in the Internet and din't find anything helpful.
I use eclipse kepler and java7.
I have jfxrt.jar in my classpath.
For Java SE 8, the JavaFX source code is distributed with the JDK. If Eclipse does not pick it up automatically, you need to select the zip file using the standard "Attach Source" approach. The file is called javafx-src.zip and is located alongside src.zip in the root of the unpacked Oracle JDK (on Windows).
Recommended - use Java 8 + e(fx)clipse
I believe if you use the recommended e(fx)clipse plugin for JavaFX development and a recent Oracle (Java 8+) JDK, then the Eclipse IDE will automatically be configured to be aware of the JavaFX sources.
Otherwise manually attach sources
If this doesn't work for you, then you can follow JodaStephan's suggestion of attaching sources manually.
For Java 7 users
If you must use Java 7 rather than Java 8, then full source won't be available as JavaFX was only fully open sourced for Java 8. However, you can view some of the source by manually downloading the source code as described at: Where can I download the JavaFX 2.2 source code?, then manually attaching sources. I do not recommend use of Java 7 for JavaFX development or runtime as there were many bug fixes and improvements in Java 8 which are not ported to Java 7.
Disclaimer
I'm not an Eclipse user and haven't tried some of these options.
I wanted to start learning java but Eclipse is giving me some trouble.
First of all I'm a beginner with Java with little to no knowledge about it. I want to use 'JavaSe-1.7'. I have no clear reason to use it besides using the latest version. After downloading Eclipse (Eclipse IDE for Java Developers) I created a new Java project and selected 'use an execution eviorment JRE : JavaSE-1.7'. This directly popped the notification saying 'The default compiler compliance level for the current workspace is 1.6. The new project will use a project specific compiler compliance level of 1.7.'. I finished creating the project and started following some tutorials.
However I noticed directly I have 2 errors which dont explain anything or have a source. I ignored it and started typing and tried to import 'java.io.console' however it said 'The import java.io cannot be resolved' and I have no idea what is the cause of it neither how to fix this.
Would like some instructions into the right direction.
Thanks in advance
Check your Eclipse preferences: Java -> Installed JREs. The one that you're using should be marked and it should be a JDK not just a JRE.
Also check your project's build path: Right click on the project -> Properties -> Java Build Path
Check in the "libraries" folder whether the JRE System Library is present and if not add it using "Add library"->"JRE System Library" and then select the correct one (from an installed JDK).
You may not have your JDK/JRE set up correctly.
Check the following:
Did you install a JDK or just the JSE? The JDK is needed to compile .java files to .class files. Without it, you can only run java programs, not develop them. If not, download and install it from Oracle website.
Check in Eclipse, if you have the JRE installed there as well. You just need to specify the path to the installation. You can reach this screen via the "Window->Prefrences" menu. see this screenshot:
The message you receive about project specific compiler compliance level is not a problem, it just means that your workspace is set up to comply to java 1.6 but your project will comply to java 1.7 standards. Also, Java 7 in general is no problem whatsoever.
Paths may differ, especially if you're not running a *nix OS. Just point the location to where you installed your JDK.
I have a code written in java. when i load it in eclipse it shows an error in the java code import line " The import com.sun.java.browser.plugin2 cannot be resolved"
import com.sun.java.browser.plugin2.*;
How can i fix this error..??
It's possible that it's to do with the version of Java you're building your project with, since the new applet class files were only introduced in Java 1.6 / 6.0. So, right click on your project on the left, go to Properties, Java Build Path, Libraries tab, and scroll down the list until you see JRE System Library. Note the version. If it reads less than 6.0 / 1.6, you're using an old version.
Click on JRE System Library, click Remove (make sure you have at least Java 1.6 installed!) then click Add Library. Select JRE System Library and select your Java version. If this isn't listed, go to Window > Preferences, Java > Installed JREs, click Add, and locate your JRE. Then repeat the same process and it should work.
(Edit: ignore what I said, the com.sun.* classes are hidden from the user. I don't think you can use it)
As far as I know, packages com.sun.* are implementation details of certain jvm and must not be used by application developers. They can be slightly different even between minor versions of jvm. Difference between major versions or jvms of different vendors can be sufficient. So IBM's and Sun's jvms have different structure of those packages. Only packages java.* and javax.* and org.* should be used. To fix this error correctly you must not use this package. To hack it around, you can try configure eclipse to use appropriate jvm though I don't know how to do it.
Update:
There's a FAQ entry about those packages. Thanks to R. Bemrose.
Did you type this in? Then the build path in incorrect. If not no sure what is going on.
Are you sure you are using the right JRE for your project? Like Java6?
See also JRE settings, and then make sure your project uses a Java6 JRE.
You have to add the plugin to the MANIFEST.MF dependency entry
Open MANIFEST.MF
Got to tab Dependencies
Add the plugin your referenced class is placed
You also have to be sure, that the package, the called class is lying, is added in the "Runtime" tab of the MANIFEST file.
EDIT:
The MANIFEST file you can find in the /META-INF directory