cannot resolve symbol javafx application in IntelliJ Idea IDE

Question

I tried to create a JavaFX application in IntelliJ Idea IDE but I got compile error that said      java  package javafx application does not exist     I have changed the Project SDK and the Project Language Level to Java 8  reloaded the project but it didn t help  Then I checked if JavaFX plugin was enabled in the settings   The search on Google and StackOverflow didn t give me more ideas of what is wrong  Thank for any help in advance   P S  I am using IntelliJ Idea 14 0 with java8 1 0 25 on archlinux OS

User · Answer

This should be your perfect solution  Try and enjoy  If some command does not work properly that means if you get any error  try to solve it yourself  I have given you the main thing you need  If your application is in a different location  or your system architecture is different  solve it yourself  It s very easy to do it  Just follow my given solution   Step 0   sudo apt-get install openjdk-8-jre   Step  1  sudo apt-get install openjfx   Step 2   sudo cp  usr share java openjfx jre lib ext    usr lib jvm java-1 8 0-openjdk-amd64 lib   Step 3   sudo cp  usr share java openjfx lib    usr lib jvm java-1 8 0-openjdk-amd64 lib   Step 4   sudo chmod 777 -R  usr lib jvm java-1 8 0-openjdk-amd64   now open a new project or rebuild your project  Good luck

User · Answer

You need to download the java-openjfx package from the official Arch Linux repos   Also  make sure you have the openjdk8-openjdk package   After doing that  open your project in Intellij and go to Project-Structure -  SDKs -  1 8 -  Classpath and try removing the old JDK you had and clicking on the directory for the new JDK that will now contain jfxrt jar

User · Answer

As indicated here  JavaFX is no longer included in openjdk   So check  if you have  lt Java SDK root gt  jre lib ext jfxrt jar on your classpath under Project Structure - gt  SDKs - gt  1 x - gt  Classpath  If not  that could be why  Try adding it and see if that fixes your issue  e g  on Ubuntu  install then openjfx package with sudo apt-get install openjfx

User · Answer

Sample Java application   I m crossposting my answer from another question here since it is related and also seems to solve the problem in the question   Here is my example project with OpenJDK 12  JavaFX 12 and Gradle 5 4   Opens a JavaFX window with the title  Hello World   Able to build a working runnable distribution zip file  Windows to be tested  Able to open and run in IntelliJ without additional configuration Able to run from the command line   I hope somebody finds the Github project useful    Instructions for the Scala case   Additionally below are instructions that work with the Gradle Scala plugin  but don t seem work with Java  I m leaving this here in case somebody else is also using Scala  Gradle and JavaFX   1  As mentioned in the question  the JavaFX Gradle plugin needs to be set up   Open JavaFX has detailed documentation on this  2  Additionally you need the the  JavaFX SDK for your platform unzipped somewhere  NOTE  Be sure to scroll down to Latest releases section where JavaFX 12 is  LTS 11 is first for some reason    3  Then  in IntelliJ you go to the File - gt  Project Structure - gt  Libraries  hit the  -button and add the lib folder from the unzipped JavaFX SDK   For longer instructions with screenshots  check out the excellent Open JavaFX docs for IntelliJ I can t get a deep link working  so select JavaFX and IntelliJ and then Modular from IDE from the docs nav  Then scroll down to step 3  Create a library  Consider checking the other steps too if you are having trouble   It is difficult to say if this is exactly the same situation as in the original question  but it looked similar enough that I landed here  so I m adding my experience here to help others

User · Answer

I had the same problem  in my case i resolved it by   1  going to File-- Project Structure---- Global libraries 2  looking for jfxrt jar included as default in the jdk1 8 0 241 lib  after installing it  3 click on   on top left to add new global library and i specified the path of my jdk1 8 0 241 Ex   C  Program Files Java jdk1 8 0 241    I hope this will help you

User · Answer

Another way to resolve the problem   Click the left mouse s button on the project folder in the project structure at the left  and click on  open module settings  in the list of actions In the new windows  click on SDKs which is under the menu title  Platform settngs  Then check on the  Classpath  list if you can find the jfxrt plugin path  if not  click on the   symbol on the right and select the repertory of the jfxrt plugin  C  Program Files Java jdk1 8 0 jre lib ext jfxrt jar on my desktop

User · Answer

In IntelliJ Idea   Check the following things are configured properly   Step 1   File -  Setting -  Plugins -  search javafx and make sure its enabled   Step 2  Project Structure  Ctrl Shift Alt s   Platform Settings -  SDKs -  1 8 -  Make sure Classpath should have  jre lib ext jfxrt jar   Step 3   Project Settings -  Project -  Project SDK - should be selected 1 8  Project Settings -  Project -  Project language level - configured as 8  Ubuntu  If not found jfxrt jar in your SDKs then install sudo apt-get install openjfx

User · Answer

You can use the one that comes with IntelliJ   lt intellij gt  jre64 lib ext jfxrt jar

User · Answer

You might have a lower project language level than your JDK   Check if   Projeckt structure project Project-  language level  is lower than your JDK  I had the same problem with JDK 9 and the language level was per default set to 6   I set the Project Language Level to 9 and everything worked fine after that   You might have the same issue

[java] cannot resolve symbol javafx.application in IntelliJ Idea IDE

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