The import javafx cannot be resolved

Question

I installed Eclipse IDE today on my Ubuntu Linux and then installed JavaFX using \'Install New Software\' and when I created a javafx project, I got the following error in M

Answer 1

For Java Compiler 8 or above, do the following:

1. Right-click on project
2. Choose Build Path ----> Add Libraries

You will then be presented with the following screenshot below:

Make sure you have downloaded and installed a JDK 8 or above

When you press the finish button, all Java FX errors in your code should disappear.

Note Prerequisites:

JDK 9 installed and tested on NetBeans 8.0.1

Answer 2

Here's how to set it up on Ubuntu Linux with Maven:

1) Install OpenJFX package, check where did it put the files.

      sudo apt install openjfx
      dpkg-query -L openjfx

You might end up with version for JDK 11. In which case, either follow with installing a new OpenJDK, or set a version of OpenJFX for JDK 8.

2) Put it to your Maven project as a system-scoped dependency.

Note this is the lazy and not-so-nice way. Properly, you should install the jars like this:

dpkg-query -L openjfx | grep -E '.jar$' | xargs -l -I{} \
  mvn install:install-file -Dfile="{}" -DgroupId=javafx \
    -DartifactId=$(echo $JAR | tr '.' '-') -Dversion=1.0 -Dpackaging=jar

And then use it as a normal compile-scoped dependency.

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.source.level>1.8</project.source.level>
    <project.target.level>1.8</project.target.level>

    <javafx.dir>/usr/share/openjfx/lib</javafx.dir>
</properties>

<dependencies>

    <!-- JavaFx :
      sudo apt install openjfx
      dpkg-query -L openjfx
    -->
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-base</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.base.jar</systemPath>
    </dependency>
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-controls</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.controls.jar</systemPath>
    </dependency>
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-fxml</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.fxml.jar</systemPath>
    </dependency>
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-graphics</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.graphics.jar</systemPath>
    </dependency>
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-media</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.media.jar</systemPath>
    </dependency>
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-swing</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.swing.jar</systemPath>
    </dependency>
    <dependency>
        <groupId>javafx</groupId>
        <artifactId>javafx-web</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${javafx.dir}/javafx.web.jar</systemPath>
    </dependency>

</dependencies>

Answer 3

According to the packages list in Ubuntu Vivid there is a package named openjfx. This should be a candidate for what you're looking for:

JavaFX/OpenJFX 8 - Rich client application platform for Java

You can install it via:

sudo apt-get install openjfx

It provides the following JAR files to the OpenJDK installation on Ubuntu systems:

/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/jfxrt.jar
/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfxswt.jar
/usr/lib/jvm/java-8-openjdk-amd64/lib/ant-javafx.jar
/usr/lib/jvm/java-8-openjdk-amd64/lib/javafx-mx.jar

Hope this helps.

Answer 4

A) Make sure that you are using a compatible JDK, like 1.8, AND

B) configure a compatible version of Java in the Eclipse Project Facets.

1. Right click on the Java project, select Properties
2. Select Project Facets, find Java, set version 1.8

For Java 11, this error also appears, as JavaFX has been removed from Java 11 and comes as standalone

More info: https://blogs.oracle.com/java-platform-group/the-future-of-javafx-and-other-java-client-roadmap-updates