I'm working on a project in Eclipse where I use the JavaSE-14 Modulepath and JavaSDK Classpath. However, every time I try to import a class from JavaFX it says the import javafx cannot be resolved. Any help? I'm new to programming in Java so please elaborate your answer.
JavaFX is now a separate bundle to JDK so if you wish to use JDK14 with Eclipse then download a compatible JavaFX SDK. JavaFX 15.0.1 requires JDK 11 or later.
Then set up your project build path - right mouse on project: Build Path > Configure Build Path.
In Libraries tab it is easier to define a variable: Add Variable JAVAFXLIB and pick the lib dir of your JavaFX release - example: set JAVAFXLIB to C:/java/javafx-sdk-15/lib.
Then use the variable in the Module Path or Class Path of your project - example JAVAFXLIB/javafx.base.jar.
If you plan to release your application you may want to get hold of the JavaFX jmods release as well. Then you can use jlink to package Java runtime with your JavaFX dependencies as one unit - this will simplify your runtime-environment.
Related
I am just starting with JavaFX and for some reason, Eclipse does not suggest to import JavaFX stuff so I have to type it in manually. Example: javafx.scene.Group I typed in Group as a type and it suggested other things such as javax.swing.GroupLayout.Group
image of suggestions
I'm not exactly sure, but I think maybe the fact that the JavaFX library is under Modulepath instead of Classpath has to do with it, but it only works if it is under Modulepath.
Help would be greatly appreciated, thanks!
I'm rewriting this answer, as #kleopatra pointed out it was inexact
For suggestions to work, you need to have JavaFX on your project's build path.
If you've created a plain Java project in Eclipse, with a module-info.java at it's source path root, then you need to add all the required jars to the module path:
JavaFX SDK should already be installed on your system, or download it from Gluon and unzip it
Right-click your Java project, got to Build Path -> Configure Build Path...
Go to Libraries tab, point to the Modulepath section
Click [Add External JARs...] button, pick all the jars from JavaFX SDK, hit [Apply and close]
Then suggestions should work as expected, and imports will be automatically inserted at the top of your java files, but they will appear in error the first time you import anything from a given library module, as this module must also be required in your module-info.java. You can do that automatically with a quick fix ("Add 'requires javafx.something' to module-info.java") when hovering the import.
Now there's a more straightforward way to create a JavaFX modular project in Eclipse, using Maven:
Create a new Maven Project
Check and pass the first wizard screen
Select archetype org.openjfx:javafx-archetype-fxml
On the next screen, you can select the JavaFX version of your choice (currently 13 by default)
After the wizard terminates, you've got a nice little project already setup with an application window and two FXML sample displays. You can start from there to build your own project.
I'm having an issue with my JavaFX imports and the extends application portion of my main method.
I've tried cycling through all the SDK and programming level features on my IntelliJ and still no luck
Screenshot of the issue on IntelliJ
Sorry for the low-quality image but any help on this would be greatly appreciated
It seems the javafx library is not added to your classpath. This can be done by adding the folloging to your VM options:
--module-path [path\to\your\javafx\home\lib] --add-modules ALL-MODULE-PATH
where [path\to\your\javafx\home\lib] must point to the location where you downloaded javafx as it does not come with the jdk as of version 11: download
You can also add it as an external library in IntelliJ within the module settings (Dependencies).
If you hover the mouse over one of the red marks on the right-hand size, it should tell you what's wrong with the import. It seems that the IDE is complaining about all your javafx imports, but the other java imports are fine, so my guess is that you are using a JDK version that does not include JavaFX. If that is the case, you need to add it as an extrernal library to your project.
To do that, click on File->Project Structure, then select Libraries, click on the "+" icon, browse to the "lib" sub-folder of the JavaFX SDK folder, and add it.
I'm running Netbeans 11 with JDK 12. I'm trying to create a JavaFX project - following all the steps in the openjfx documentation here:
https://openjfx.io/openjfx-docs/
Specifically: JavaFX and Netbeans - Non-modular with maven
I got the project setup fine and it can run and display whatever components I add to it via SceneBuilder. However, if I add any other dependencies, I can't import anything from those dependencies. I can drill down within the added jar in the dependencies list and see the classes defined that I'm trying to add, but the only options I have when trying to fix imports is to create a class for whatever I'm trying to use. Though everything works fine for javafx-controls and javafx-fxml.
What am I missing?
I just installed Eclipse Oxygen and tried to open an existing project into the workbench but I get this error:
The project was not built since its build path is incomplete. Cannot
find the class file for java.lang.Object. Fix the build path then try
building this project
I tried right clicking on the project - went to Properties - Java Build Path - Libraries - Add Library - JRE System Library and selected Workbench default JRE (jre1.8.0_60).
I then cleaned and rebuilt the project but it then causes more errors to come up like:
ActionBar cannot be resolved to a type
Activity cannot be resolved to a variable
AdapterView cannot be resolved to a type
ArrayAdapter cannot be resolved to a type
Here is what made the error disappear for me:
Close eclipse, open up a terminal window and run:
$ mvn clean eclipse:clean eclipse:eclipse
Are you using Maven? If so,
Right-click on the project, Build Path and go to Configure Build Path
Click the libraries tab. If Maven dependencies are not in the list, you need to add it.
Close the dialog.
To add it:
Right-click on the project, Maven → Disable Maven Nature
Right-click on the project, Configure → Convert to Maven Project.
And then clean
Edit 1:
If that doesn't resolve the issue try right-clicking on your project and select properties. Select Java Build Path → Library tab. Look for a JVM. If it's not there, click to add Library and add the default JVM. If VM is there, click edit and select the default JVM. Hopefully, that works.
Edit 2:
You can also try going into the folder where you have all your projects and delete the .metadata for eclipse (be aware that you'll have to re-import all the projects afterwards! Also all the environment settings you've set would also have to be redone). After it was deleted just import the project again, and hopefully, it works.
In Eclipse, Right click Project -> Maven -> Update Project. It fixed errors in my project.
I'm also using Eclipse Oxygen, migrated from Mars. I faced the same error. I deleted .metadata, .recommenders folders and added projects from archive and issue is solved. I also use Android Studio but i like Eclipse much more.
At my system the Java Runtime JAR file jrt-fs.jar was not found because it was in the wrong directory. This file should be located in the "lib" subfolder. If you installed Java at "C:\Temp\java" the file should be here at C:\Temp\java\lib\jrt-fs.jar .
These are the steps to make jrt-fs.jar available to Eclipse:
Window / Preferences -> the "Preferences" Window opens
Select in the left menu: Java / Installed JREs
Press the [Add...] Button -> A window opens
Select "Standard VM" - The window "JRE Definition" opens.
Enter your path information:
JRE home = "C:\Temp\java"
JRE name = "MyJRE"
Select [Add External JARs...] to link the jrt-fs.jar
JRE system libaries: "C:\Temp\java\lib\jrt-fs.jar"
It worked for me with OpenJDK12 and Eclipse 2019-09 (4.13.0).
Eclipse reported me this error:
The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object. Fix the build path then try building this project
I had faced this problem. I added the C:\Users\Office 2\android-sdks\platforms\android-19\android.jar to the Java Build Path's Library. And the project started to run again.
The problem occurred due to my carelessness. Yesterday night I was updating the Android SDK, and at the same time I tried to run the project, while the SDK Manager was uncompressing the system image. The Project couldn't start and the error occurred.
I tried all the methods given by others. But nothing worked. It solved when I added the android.jar to the library.
I guessed it that android library is missing. not the Java, when I saw the errors only at the android methods and imports. But when I read the posts, I got confused and wasted some time trying wrong way.
I had faced the same issue and tried different solutions, I have reinstalled my JDK 11 and restarted the machine, after that the issue gets resolved.
I got this out of the blue in a workspace that was working properly before. This problem seems to indicate that the project configuration somehow got corrupted.
Restarting Eclipse didn't help, but in the same vein as the answers dealing with Maven, regenerating the Eclipse project config with:
./gradle eclipse
or
./gradlew eclipse
if you use the wrapper, solved this problem for me.
I have similar issue when importing Spring Boot, jdk 11 (using
inside docker) project to Eclipse 2019 (2021), in Ubuntu, instead when
importing to Inteelij IDEA Community or NetBeans IDEs they do
not produce the same set of after-import errors as in Eclipse.
The Spring Boot is multimodule maven projects and two child
modules give such 2 "problems" in appropriate problems tab:
The project was not built since its build path is incomplete.
Cannot find the class file for java.lang.Object. Fix the build
path then try building this project
Next 2 errors are produced in two classes of aforementioned
maven modules:
The type java.lang.Object cannot be resolved. It is
indirectly referenced from required .class files
Manipulation with adding JDK 11 to submodules buildpath
just leads to the thousands of problems. Also it is
got when I use Eclipse-File-Maven-Update.
Moreover when I try to edit most of existing classes or add new ones
I got red underline that tells
Implicit super constructor Object() is undefined for default
constructor. Must define an explicit constructor
. So almost no opportunity to use Eclipse
even at prebuild stage as docker-compose should run build and
run. Indeed I noted that such issue is produced just when project
also uses modules (module-info files introduced in java9).
When I import project on jdk 8 (even not installed on
system), or even on jdk11 without module-info files all
is fine in Eclipse after import.
Another difference is that of when I use problem old no module
project the Build Path is composed with jre environment 8 and
maven dependency items, but when using
"module-info" project the Build path contains -module path,
and -classpath. So I even do not know where to add jre 11,
indeed adding does not resolve issue, just make more errors.
So what is the resolution of the case??? What settings to do
in Eclipse?
I'm opening new JavaFX project in IntelliJ, I have all necessary files of JDK installed, but in fxml file there are multiple errors "Unexpected token". This error shows immediately after opening new javafx project and fxml file (meaning there's nothing I add or remove from the basic fxml tags). What can I do?
You have to follow IntelliJ instructions here.
Download and install JDK 7 or a later version (earlier JDK versions don't include the JavaFX SDK necessary for JavaFX application development).
If you are going to use JavaFX Scene Builder, download and install it as well.
Make sure that the JavaFX plugin is enabled. (JavaFX support in IntelliJ IDEA in based on the JavaFX plugin. This plugin is bundled with the IDE and enabled by default.) See To make sure that the JavaFX plugin is enabled.
Define the JDK in IntelliJ IDEA. You can do that separately (see To define JDK 7 in IntelliJ IDEA) or when creating a project or module (see Creating a project for JavaFX development).
If necessary, specify the path to the JavaFX Scene Builder executable file. If you do so, you'll be able to open your FXML files in the Scene Builder right in IntelliJ IDEA. See To specify the path to the JavaFX Scene Builder executable file.
Create a project for your JavaFX application development. Your can create the corresponding project from scratch or, if you already have the source files you want to continue working with, you can create a project by importing the corresponding sources. See Creating a project for JavaFX development or Creating a Project by Importing Existing Sources. See also, Using Scene Builder with IntelliJ IDEA.