Develop Reference

JavaFX maven samples for CLI and IDE, what is the difference? [duplicate]

I use IntelliJ IDEA as my development environment, and Maven for dependency management. I frequently build my project structure (directories, poms, etc) outside of IDEA and then import the project into IDEA using Import project from external model. This works great, except that in my poms I specify that the maven-compiler-plugin should use JDK 1.6, and when I import, IDEA informs me that the Language Level Changed and that Language level changes will take effect on project reload, and then prompts to reload the project. This is annoying because I always use the same JDK version.
How do I change the default JDK that IntelliJ IDEA uses, so that I don't have to reload my project every time I import a new project?

This setting is changed in the "Structure for New Projects" dialog. Navigate to "File" -> "New Projects Setup" -> "Structure..."
Next, modify the "Project SDK" and "Project Language Level" as appropriate.
Previous versions of IntelliJ IDEA had this setting in "File" -> "Other Settings" -> "Default Project Structure...".
IntelliJ IDEA 12 had this setting in "Template Project Structure..." instead of "Default Project Structure..."

Download and unpack a JDK archive file (.tar.gz) and add it as a SDK in the 'Project Structure' dialog box ( Ctrl+Alt+Shift+S )
click on the gif to enlarge
Also make sure to set an appropriate 'Project language level'. I forgot to do that when creating the GIF.
Project Structure > Project > Project language level
For Java 8 set it to 8, for Java 9 set it to 9, and so on.

I am using IntelliJ IDEA 14.0.3, and I also have same question. Choose menu File \ Other Settings \ Default Project Structure...
Choose Project tab, section Project language level, choose level from dropdown list, this setting is default for all new project.

I have found out that in recent versions of IntelliJ IDEA requires Java 1.8 but is not configured by default.
We can change the path or configure from Project Settings > Project > Project SDK
here we can edit or add the JDK´s path.
(in my case the path is located in C:\Program Files\Java\jdk1.8.0_102)

Change JDK version to 1.8
Language level File -> project Structure -> Modules -> Sources -> Language level -> 8-Lambdas, type annotations etc.
Project SDk File -> project Structure -> Project 1.8
Java compiler File -> Settings -> Build, Executions, Deployment -> Compiler -> Java compiler

One other place worth checking: Look in the pom.xml for your project, if you are using Maven compiler plugin, at the source/target config and make sure it is the desired version of Java. I found that I had 1.7 in the following; I changed it to 1.8 and then everything compiled correctly in IntelliJ.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>

The above responses were very useful, but after all settings, the project was running with the wrong version. Finally, I noticed that it can be also configured in the Dependencies window.
Idea 2018.1.3 File -> Project Structure -> Modules -> Sources and Dependencies.

To change the JDK version of the Intellij-IDE himself:
Start the IDE -> Help -> Find Action
than type:
Switch Boot JDK
or (depend on your version)
Switch IDE boot JDK

For latest version intellij, to set default jdk/sdk for new projects go to
Configure->Structure for New Projects -> Project Settings -> Project SDK

I am using IntelliJ 2020.3.1 and the File > Other Settings... menu option has disappeared. I went to Settings in the usual way and searched for "jdk". Under Build, Execution, Deployment > Build Tools > Maven > Importing I found the the setting that will solve my specific issue:
JDK for importer.

On my linux machine I use a script like this:
export IDEA_JDK=/opt/jdk14
/idea-IC/bin/idea.sh

Intellij IDEA lombok cannot find symbol symbol [duplicate]

I'm trying to use Lombok in my project that I'm developing using IntelliJ IDEA 11.
I've installed 3rd-party plugin for IDEA and it seems working fine because IDEA sees all autogenerated methods/fields.
So I have a class that uses Slf4j. I annotated it like this
import lombok.extern.slf4j.Slf4j;
#Slf4j
public class TestClass
{
public TestClass()
{
log.info("Hello!");
}
}
But when I build my project compiler spits: cannot find symbol variable log.
Could you please tell me what I'm missing here?
Update: It turned out it's RequestFactory annotation process that fails.
input files: {com.zasutki.courierApp.server.TestServlet, com.mine.courierApp.server.model.DatastoreObject}
annotations: [javax.inject.Singleton, javax.inject.Inject, lombok.Getter, lombok.Setter, com.googlecode.objectify.annotation.Id, com.googlecode.objectify.annotation.OnSave]
Processor com.google.web.bindery.requestfactory.apt.RfValidator matches [lombok.Getter, com.googlecode.objectify.annotation.Id, javax.inject.Inject, lombok.Setter, com.googlecode.objectify.annotation.OnSave, javax.inject.Singleton] and returns false.
cannot find symbol variable log
Any ideas on workarounds?
Update2: Perhaps it's not something readers want to hear but I ended up switching to Scala.

I have fixed it in IDEA 12 by setting check box Enable annotation processing in:
Settings -> Compiler -> Annotation Processors
For IDEA 2016.2:
Preferences... > Build, Execution, Deployment > Compiler > Annotation Processors
After enabling, run Build -> Rebuild Project to have annotations recognized and eliminate errors.
For IDEA 2019.2.1, depending on how the project is configured, installing the Project Lombok plugin may not be sufficient. Here is another way to use Project Lombok with IntelliJ IDEA:
Visit https://projectlombok.org/download
Download the JAR file into the project lib directory (e.g., $HOME/dev/java/project/libs).
Start the IDE.
Click File 🠖 Settings.
Expand Build, Execution, Deployment 🠖 Compiler 🠖 Annotation Processors.
Ensure Enable annotation processing is checked.
Ensure Store generates sources relative to is selected based on the project's module settings (if Module output directory doesn't work, come back and try the other setting).
Click Apply.
Click Plugins.
Click Marketplace.
Set search field to: lombok
Install Lombok.
Click OK.
Restart the IDE if prompted.
Click File 🠖 Project Structure.
Select Libraries.
Click the + symbol to add a new project library (or press Alt+Insert).
Select Java.
Set the path to: $HOME/dev/java/project/libs/lombok.jar
Click OK.
Select the modules to apply.
Click OK.
Optionally, rename lombok to Project Lombok 1.18.8.
Click OK.
The project can now import from the lombok package and use Project Lombok annotations (e.g., lombok.Setter and lombok.Getter).

Picture representation of resolving this issue.
First enable annotation processors and try. This may or may not work.
Post that, you can install the lombok plugin from intellij, (After installation Intellij will restart to enable the plugin, so make sure you save your work.(Intellij does save all the changes before restart, just to be on the safe side.)) screenshot below:

Enabling annotation processing will make it work
But if you are on a Mac, make sure you enable annotation processing(tick the checkbox) from both the places available.
1.) Intellij Idea -> Preferences -> Compiler -> Annotation Processors
2.) File -> Other Settings -> Default Settings -> Compiler -> Annotation Processors

Make sure it's added correctly to your project.
example for Gradle:
dependencies {
compileOnly 'org.projectlombok:lombok:1.18.8'
annotationProcessor 'org.projectlombok:lombok:1.18.8'
...
}
Install Lombok plugin for your IDE
Check "Enable annotation processing" checkbox in IDE (IntellijIdea), have no idea if there is anything like this for other IDEs like Eclipse.

in the latest Gradle version you should use annotationProcessor:
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok:1.18.8'

I'm using IntelliJ IDEA 2020.3 (Community Edition)
Here, besides install the Lombok plugin and enable annotations (explained by other answers). I also needed to set the flag -Djps.track.ap.dependencies=false to the Build Process Option¹.
I didn't need to use the -javaagent approach, neither setup the classpath.
¹. Go to: File | Settings | Build, Execution, Deployment | Compiler | "Shared build process VM options" field
References:
https://github.com/rzwitserloot/lombok/issues/2592#issuecomment-705449860
https://youtrack.jetbrains.com/issue/IDEA-250718#focus=Comments-27-4418347.0-0

Just for reference using IntelliJ 2018.3, I solved this issue (using #Data annotation to insert getter/setter) following the three steps:
File -> Settings -> Build, Execution, Deployment -> Annotation Processors -> Enable Annotation Processing;
Do remember to Apply the change.
Install plugin lombok in the same setting dialog;
It seems good enough for now, it requires to restart IntelliJ and then rebuild your project.
Best wishes :)

If you have checked both these steps as follows
Enable annotations : this is a check done in IntelliJ
preferences.
Importing lombok into IntelliJ classPath
(Preferences -> Plugins)
and still getting errors then please check the compiler - if it is JAVAC or ECLIPSE.
You can check the compiler in Preferences -> Build,Execution,Deployment -> Compiler -> Java Compiler.
Change the Use compiler to Javac (if it is Eclipse). This is what worked for me.

Including the following in the pom.xml is what worked for me:
<build>
<defaultGoal>spring-boot:run</defaultGoal>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<annotationProcessorPaths>
...
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</build>

As noted here, quote: "You should activate external compiler option and enable annotation processors or disable external compiler and disable all of annotation compilers to work with lombok". This fixed my problem. Note that I added the Scala plugin prior to receiving this error, so I suspect the plugin changed some of the above settings.

there is a plugin for intellij. see here: https://projectlombok.org/download.html

Do you have lombok as dependency of your project? lombok.jar must be on the classpath during compiling of the project, which is using any of lombok-annotations.

For those of you who are still having trouble:
In addition to the above steps of enabling annotation processors and installing the IntelliJ Lombok plugin, I also had to Build -> Rebuild Project.

1、install lombok plugin for IDEA
Intellij Idea -> Preferences -> Plugins -> type in lombok -> Search in Repositories -> install -> restart IDEA
2、 config lombok plugin
Enabling annotation processing will make it work
But if you are on a Mac, make sure you enable annotation processing in the following two places:
Intellij Idea -> Preferences -> Build, Execution, Deployment -> Compiler -> Annotation Processors, check the checkbox of "Enable annotation processing".
File -> Other Settings -> Default Settings -> Build, Execution, Deployment -> Compiler -> Annotation Processors, check the checkbox of "Enable annotation processing".

I was on Mac
This is my IntelliJ IDEA and Mac Version - IntelliJ IDEA 2017.1.5 Build #IU-171.4694.70 --- Mac OS X 10.12
In addition to enabling annotation processing (tick the checkbox) at these 2 places.
1.) Intellij IDEA -> Preferences -> Compiler -> Annotation Processors
.
2.) File -> Other Settings -> Default Settings -> Compiler -> Annotation Processors
I had to install Lombok plugin too to make it work.
3.) Intellij IDEA -> Preferences -> Plugins ->Browse Repositories-> Search for "Lombok"-> install plugin -> Apply and restart IDEA

It didn#t work for me with any of the above solutions. I added <scope>provided</scope> to the dependency in pom.xml and it worked.
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.20</version>
<scope>provided</scope>
</dependency>

If you already installed it, then for refresh just deselect and select Enable annotation in Intellij Settings.

I have faced this problem after updating the IDEA to 2018.3. I had to update all the existing plugin

After trying all the suggestions here, I have also find another kind of solution. It seems that sometimes IDEA can not obtain processors from project classpath.
So, on the Annotation Processors settings tab, you have to manually specify Processor path.

Apart from mentioned in all answers I have to add the below code in pom.xml configuration to makes mvn clean install work. Before adding this code I was getting cannot found symbol for getters and setters.
<annotationProcessorPath>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
</annotationProcessorPath>

For me what worked:
I uninstalled the installed the Lombok plugin freshly
I ticked "Enable Annotation Plugin"
I selected "Obtain processor from the project classpath" in the same page

For IntelliJ IDEA 2020.1.1 enabling Kotlin plugin fixed this issue.

If you did everything mentioned in this question and It's still failing, don't forget to remove /target folder under your projects. And If it's still failing, restart your IDE.
And If it's still failing restart your computer.

The Jetbrains IntelliJ IDEA editor is compatible with lombok without a plugin as of version 2020.3.
I was using 2020.2 version, i updated to 2020.3 it worked just like that.

I don't think I read my final step in the answers yet. (Mac + IntelliJ Ultimate 2020.1)
Its just a silly cause in my case, but those are the ones that can take up most time because the error doesnt directly refer to it.
The same lombok error appeared to me after deleting and recloning the project.
After doing the steps mentioned earlier in this thread I still had the error, I then discovered my SKD was defaulted to version 11. I changed this back to 1.8 and everything worked again.
File --> Project Settings --> Project
I changed the Project SDK and the Project language level to 1.8
PS the location for the default settings on the mac is different in this IntelliJ version than mentioned before :
File --> New Project Settings --> Preferences for new Projects --> Build, Execution, Deployment --> Compiler --> Annotation Processors --> 'check' Enable annotation processing
Hope this helps anybody

If none of the above did'nt work , then try to change File->Project Structure->Project->Project Language Level > 8 Lambda,type annotations (Not SDK Default 8)
This worked for me .

I tried enabling lambok, restarted intellij, etc but below worked for me.
Intellij Preferences ->Compiler -> Shared Build process VM Options and set it to
-Djps.track.ap.dependencies=false
than run
mvn clean install

It may happen that even if you have it configured properly and it is visible among the libraries and in Gradle dependencies list, IntelliJ still does not have it in class path. Or it is there, but configured with different scope (ex: test instead of compile.)
First, make sure you have plugin installed and annotation processing enabled, as stated in other answers.
If you still have annotation not recognized, place cursor on it, hit ALT+ENTER (or OPTION+ENTER) and see if you have a menu option Add library: Gradle: org.projectlombok:lombok:VERSION to class path. If you can see it, choose this one and it may solve your problem.
You may check the library and it's scope in:
Project settings / Modules / Dependencies tab (search for lombok in there)

I had a similar issue when building with JDK8, set the project back to JDK7 and it worked fine. Could be an older version of Lombok that won't compile under JDK8.

If you tried all solutions presented here and still can't compile sources, also look here: Static import of builder class breaks bytecode generation in Maven - look at your sources if it has such static imports. This affects maven plugin, so compilation will fail on other build systems outside IntelliJ IDEA.

Eclipse Default JRE Preference Installed JRE Not Working

I went to the Preference of Eclipse and changed the default JRE to the Java SE 8, and also changed the Compiler settings of Eclipse to be 1.8 JDK compliance. I even removed the other JREs.
However, when I import a project, as you can see from the Project Explorer, the project name is "SpringService", somehow the JRE System Library is JavaSE-1.6 and they are still using 1.6 as default!
Can anyone tell me what I did wrong? Otherwise every new project I have to manually go to the properties and change it manually! Hate it!
This post might be relevant to enter link description here SO question.

When you set your Installed JREs preference, you want to select the root directory of a full Java Development Kit installation, not just a bare JRE installation. Eclipse needs access to the supporting libraries that are bundled with a full JDK, but absent from a base JRE install.
Also, if you are importing a project, do you mean that you are importing an existing, pre-configured Eclipse project? Or just the directory structure that contains the source code? If you are importing an existing Eclipse project, it may have already been set up with project-specific settings (it's hard to give advice with being able to poke around in the settings).

Check the plugin section in the pom.xml to see if it contains the following entry.
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
This will overwrite the default preference. A lot of maven project archetype uses 1.6. Just change them to 1.8 and do a Maven->Update Project.

U can you 'Build Path' on the project ,then remove the jre1.6, add the user libiary .

IntelliJ imports project from POM using wrong JDK version

We have a Maven based Android build, and we just made the switch from JDK 6 to 7.
This came with its share of IntelliJ problems though. What happens is that every time it detects a change in the POM, and reimports/refreshes the project, it returns to selecting the old "Module SDK", the one that's configured to use Java 6:
Even if I manually delete these SDKs from the "Platform Settings" dialog, they keep reappearing as "Maven Android API 19 Platform (N)" where N is the number used to disambiguate it from all the other (identical) SDKs.
I should mention that we do specify in the POM that Java 7 is targeted. I tried to set both the compiler plugin language level, and the maven.compiler.* properties (not sure if that accomplishes the same thing or not), without luck:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
shouldn't IntelliJ pick that up and always configure the project to use a Java 7 SDK? Am I missing something?
I noticed that the problem disappears when I remove any references to 1.6 SDKs entirely in IntelliJ. Not surprising I guess, but also not viable since I have other projects that still rely on the presence of a Java 6 SDK.

I encountered a very similar issue with Maven projects I'd created using IntelliJ (version 14.x in my case). I'd configured IntelliJ to use JDK 8 in the Project Settings but the IDE continued to highlight issues in my code (e.g. complaining about the usage of #Override).
It turns out that the Maven Settings take precedence here, which in my case defaulted to JDK 1.5 (hence the IDE redlines). Changing the settings here does resolve the issue, but only temporarily because they revert back whenever the Maven projects are reimported, or when IntelliJ is restarted.
The permanent fix is to explicitly declared the JDK version in your Maven pom file, as explained in these items.
stop IntelliJ IDEA to switch java language level everytime the pom is reloaded (or change the default project language level) by #vikingsteve
IDEA: javac: source release 1.7 requires target release 1.7 by #bacchus
Here's what they've said you need to add to your pom.xml file.
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
These settings get reflected in the Maven Settings in the IDE and resolved the issue for me.

It will pick up the jdk that you choose in project structure please change it there.
File > project structure > project setting > project > project sdk choose 1.7.
If 1.7 is not present go to
File > project structure > Platform setting > SDKs addd 1.7 there.

It's also important to note that you need to change the runner (jdk level) of your maven.
Maven > Runner > JRE

Warning - Build path specifies execution environment J2SE-1.4

I create a Maven project in Eclipse Helios. It works fine for a day, but then this warning shows up:
Build path specifies execution environment J2SE-1.4. There are no JREs installed in the workspace that are strictly compatible with this environment.
Since this message, the project stopped compiling and debugging. Does anyone have solution for this problem?

In Eclipse from your project:
Right-click on your project
Click Properties
Java build path: Libraries; Remove the "JRE System Library[J2SE 1.4]"
Click Add Library -> JRE System Library
Select the new "Execution Environment" or Workspace default JRE

Whether you're using the maven eclipse plugin or m2eclipse, Eclipse's project configuration is derived from the POM, so you need to configure the maven compiler plugin for 1.6 (it defaults to 1.4).
Add the following to your project's pom.xml, save, then go to your Eclipse project and select Properties > Maven > Update Project Configuration:
<project>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

The above solutions fix the project or work around the problem in some way. Sometimes you just don't want to fix the project and just hide the warning instead.
To do that, configure the contents of the warning panel and make sure to toggle-off the "build path"->"JRE System Path Problem" category. The UI for this dialog is a bit complex/weird/usability challenged so you might have to fiddle with a few of the options to make it do what you want.

In eclipse preferences, go to Java->Installed JREs->Execution Environment and set up a JRE Execution Environment for J2SE-1.4

The actual cause of this warning is that you have configured your project to run with an earlier JRE version then you have installed. Generally this occurs whenever you use old projects with newer JREs.
This will likely cause no trouble at all. But if you want to be really on the save side, you should install the correct, old JDK. You can find them here: http://www.oracle.com/technetwork/java/archive-139210.html
If you then restart eclipse you can go into Window > Preferences > Java > Installed JREs > Execution Environments and set for in your case J2SE-1.4 the [perfect match] as eclipse calls it.

If you have Java 1.8 then
You need this xml part in pom.xml and update project.
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>

the correct procedure to resolve this warning, as other people write, is to go inside your project Properties and click on Java Build Path located on the left. Now you will find inside the Libraries Window the J2SE 1.5, double click on this one and a new window will give you the possibility to choose the correct Excecution Environment. Now select your version and the warning will disappear.

I met the same warning in STS (Spring Tool Suite), if it may help someone somehow.
This is the source https://www.baeldung.com/eclipse-change-java-version, and here's a summary of it :
Warning :
build path specifies execution environment javase-11. there are no jres installed in the workspace that are strictly compatible with this environment.
Environment :
Ubuntu 20.04 (with default OpenJDK11)
STS 4
To solve the warning :
Change the JRE of the workspace of STS (By default, STS uses the JRE embedded in its plugins) :
Window>Preferences>Installed JREs>Add>Standard VM>Directory (browse to your openjdk folder, in my case /usr/lib/jvm/java-11-openjdk-amd64)>Finish)
Check the new JRE, then Apply and close
Now configure the spring-boot project to use the newly added JRE :
Right click on the project > properties > Java Build Path > in Libraries tab > Remove the old JRE, then in Modulepath Add Library > JRE System Library > Environments (choose JavaSE-11, make sure to check it on the right panel, mentionned "perfect-match"), Apply and Close
And voilà

Did you setup your project to be compiled with 1.4 compliance? If so, do what krock said. Or to be more exact you need to select the J2SE-1.4 execution environment and check one of the installed JRE that you want to use in 1.4 compliance mode; most likely you'll have a 1.6 JRE installed, just check that one. Or install a 1.4 JRE if you have a setup kit, and use that one.
Otherwise go to your Eclipse preferences, Java -> Compiler and check if the compliance is set to 1.4. If it is change it back to 1.6. If it's not go to the project properties, and check if it has project specific settings. Go to Java Compiler, and uncheck that if you want to use the general eclipse preferences. Or set the project specific settings to 1.6, so that it's always 1.6 regardless of eclipse preferences.

Just change the version in Window-> Preferences-> Java -> Installed JREs. Check the installed JREs list.
Then, Right-click on your project -> properties -> Java build path -> libraries. Change the "JRE System Library" to the version in "installed JREs".
The warning will be gone.

I was getting project warning as "Build path specifies execution environment J2SE-1.5. There are no JREs installed in the workspace that are strictly compatible with this environment".
I removed the J2SE1.5 library and added new JRE System Library which resolved my problem

Expand your project in work space>>Right click(JRE System Libraries)>>select properties>>selectworkspace default JRE
the above solution sol