intellij idea - Error: java: invalid source release 1.9

Question

I'm trying to run my JSQL parser class, but I'm getting Error: java: invalid source release 1.9.

I tried to following this answer. I changed File> Build,Execution,Deployment> Java Compiler> Project bytecode version: 1.8. However, I can't change the Module language level and Project language level to 1.8 because there's not option for that. I still get the same error below.

Error

Code

package cs4321.project2;

import java.io.FileReader;
import net.sf.jsqlparser.parser.CCJSqlParser;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.select.Select;

public class Parser {
    private static final String queriesFile = "resources/input/queries.sql";

    public static void main(String[] args) {
        try {
            CCJSqlParser parser = new CCJSqlParser(new FileReader(queriesFile));
            Statement statement;
            while ((statement = parser.Statement()) != null) {
                System.out.println("Read statement: " + statement);
                Select select = (Select) statement;
                System.out.println("Select body is " + select.getSelectBody());
            }
        } catch (Exception e) {
            System.err.println("Exception occurred during parsing");
            e.printStackTrace();
        }
    }
}

seems fine it should work . Are you working with maven project? — soorapadman, Sep 18 '17 at 13:48
*However, I can't change the Module language level and Project language level to 1.8 because there's not option for that.* why is that so? and what error do you get while trying to do so? Also 1.9 seems to be the java version. Do you have Java-9 configured on your machine/intelliJ? — Naman, Sep 18 '17 at 13:50
awesome that answer worked! thanks! https://stackoverflow.com/a/12900859/7327018 — Alex, Sep 18 '17 at 14:45

score 433 · Accepted Answer · edited Aug 26 '18 at 10:57

433

Select the project, then File > ProjectStructure > ProjectSettings > Modules -> sources You probably have the Language Level set at 9:

Just change it to 8 (or whatever you need) and you're set to go.

Also, check the same Language Level settings mentioned above, under Project Settings > Project

edited Aug 26 '18 at 10:57

Beam

68
9

answered Sep 23 '17 at 19:24

DeanM

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3

Oh, finally I know what the project language level means, thanks – Daniel Dai Sep 13 '18 at 02:18
1

Also, in image above, don't forget to go to the Modules section – JWP Jan 11 '19 at 18:54
1

Better change in pom.xml 1.8 As, otherwise it may reset configuration upon reimport into intellij – Rakesh Yembaram May 26 '20 at 09:18

score 57 · Answer 2 · edited Oct 26 '19 at 05:19

57

Sometimes the problem occurs because of the incorrect version of the project bytecode.

So verify it : File -> Settings -> Build, Execution, Deployment -> Compiler -> Java Compiler -> Project bytecode version and set its value to 8

edited Oct 26 '19 at 05:19

Victor Anuebunwa

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answered Oct 25 '19 at 22:38

Rogol

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it was the solution for me on the top of Project Settings->Modules -> Language Level – Kemal Atik Mar 21 '20 at 08:23
1

This is a great complementary answer to the accepted one. – Dalton Jun 10 '20 at 15:10
Worked for me. Oct 2021. – Thanasis Namikazee Oct 03 '21 at 07:41

Ravi Parekh · Answer 3 · 2022-01-14T15:27:33.867

28

Maven Projects - and Project Structure[imported as maven in IntelliJ]

Try - If any of below pom entries present - values should be same at java level

<java.version>16</java.version>
<maven.compiler.source>16</maven.compiler.source>
<maven.compiler.target>16</maven.compiler.target>

Project Structure -> Project language level
Module -> Language level

GRADLE projects

Since we started working with GRADLE,

Build.gradle: - even below line didn't help

sourceCompatibility = '16'

I am getting this ERROR most of the time and Solution is Change Gradle JVM to XX

Preferences | Build, Execution, Deployment | Build Tools | Gradle -> JVM

edited Jan 14 '22 at 15:27

answered Aug 20 '21 at 09:18

Ravi Parekh

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THANK YOU! After following/checking all the answers above this is what did it. I just manually changed the build.gradle file. Checked in the settings (like your screenshot) again and Gradle was using a different JDK than everything else – Hobbamok Nov 02 '22 at 17:10

score 24 · Answer 4 · answered Nov 27 '17 at 20:04

24

I have had the same problem. There is an answer:

1.CTRL + ALT + SHIFT + S;
1. Then go to "Modules";
2. "Dependencies;
3. Change "Module SDK".

Got it! Now u have Java 9!

answered Nov 27 '17 at 20:04

Dmitry Kaltovich

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Gayan Weerakutti · Answer 5 · 2021-06-18T11:00:42.587

18

You should to set the JAVA SDK and appropriate language level in the project settings. Click to enlarge.

edited Jun 18 '21 at 11:00

answered Sep 08 '19 at 10:10

Gayan Weerakutti

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score 4 · Answer 6 · answered Mar 12 '19 at 06:01

When using maven project.

check pom.xml file

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>9</java.version>
</properties>

if you have jdk 8 installed in your machine, change java.version property from 9 to 8

score 4 · Answer 7 · answered Aug 02 '20 at 12:56

I was having this issue while running a SpringBoot project (Maven)

In my POM file I changed the java version from 11 to 8 and it worked:

<properties>
    <java.version>8</java.version> //The default was 11
</properties>

Make sure to Load maven changes else the change won't reflect.

score 3 · Answer 8 · answered Apr 04 '19 at 06:34

3

I've just had a similar issue. The project had opened using Java 9 but even after all the modules and project were set back to 1.8, I was still getting the error.

I needed to force Gradle to refresh the project and then everything ran as expected.

answered Apr 04 '19 at 06:34

Edward

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Same for maven, after changing all intellij settings you have to run the maven sync with "Reimport All Maven Projects"; afterwards the test is green – maxeh Sep 15 '20 at 14:57

score 3 · Answer 9 · answered Jan 09 '20 at 19:13

3

Gradle I had the same issue and changing all the settings given in the earlier solutions made no difference. Than I went to the build.gradle and found this line and deleted it.

sourceCompatibility = '11'

and it worked! :)

answered Jan 09 '20 at 19:13

likejudo

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No prefix - just that? Didn't work for me :( – AlikElzin-kilaka Mar 28 '23 at 17:17

score 1 · Answer 10 · answered May 11 '18 at 08:49

1

Alternatively via Project Settings:

Project Settings
Project
Project language Level (set to fit your needs)

Depending on how your build is set up, this may be the way to go.

answered May 11 '18 at 08:49

felvhage

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score 1 · Answer 11 · answered Dec 21 '18 at 11:46

For anyone struggling with this issue who tried DeanM's solution but to no avail, there's something else worth checking, which is the version of the JDK you have configured for your project. What I'm trying to say is that if you have configured JDK 8u191 (for example) for your project, but have the language level set to anything higher than 8, you're gonna get this error.

In this case, it's probably better to ask whoever's in charge of the project, which version of the JDK would be preferable to compile the sources.

Indeed, I had a JDK version 11 and project language level 9. Setting them both the same cleared the error. — 9-Pin, Mar 11 '21 at 03:37

score 1 · Answer 12 · answered Jan 28 '20 at 14:49

1

In Project Structure in Project SDK: modify SDK to 11 or higher and in Project language level: modify to 11 - Local variable syntax for lambda parameters

answered Jan 28 '20 at 14:49

Lucian L.

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score 0 · Answer 13 · answered Jan 08 '19 at 08:49

I also had the same problem in IntellijIdea, after selecting the project, then File > ProjectStructure > ProjectSettings > Modules -> sources the option was showing - the Language Level set at 9:

So, I Just change it to 8. Still my issue didn't got resolve.

The main issue was with pom.xml. I reimported the pom.xml file and my issue got resolved.

So, whenever you changed the pom.xml file, IDEA needs to update the project structure. For example if you've added there some more dependencies, IDEA needs to add them as project libraries.

In "Settings > Build, Execution, Deployment > Build Tools > Maven > Importing" you can choose "Import Maven projects automatically". This will automatically invoke "Reimport" action when the pom.xml is changed.

enter image description here

score 0 · Answer 14 · answered Sep 15 '20 at 05:49

0

Just additional note:

when you creating a new project from start.spring.io make sure you select your JDK version theirs by default is set to JDK 11, later it will cause the above issue.

answered Sep 15 '20 at 05:49

shubham

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score 0 · Answer 15 · answered May 28 '21 at 08:35

File > Project Structure > Project > Project SDK > Choose Version File > Project Structure > Project > Project Language Level > Choose Version File > Project Structure > Modules > Sources Tab > Language Level > Choose Level File > Project Structure > Modules > Dependencies Tab > Module SDK > Choose Version

In Pom.xml under properties change to your version

<properties>
    <java.version>16</java.version>
</properties>

Right Click Pom then Mavem then Reload Project

Samad · Answer 16 · 2021-12-27T18:51:22.297

I was able to overcome this issue only clearing/removing the VM configuration. But you should do all the following checks:

Menu File/Project Structure/Project (select the SDK and the correct language level -- in may case 1.8.0_201 and "8 - Lambdas...")
Menu File/Project Structure/Modules/Sources (on the right) - Select the same Language Level
Menu File/Project Structure/Dependencies (also on the right) - Select the same Module SDK
(If still does not work...) Menu Run/Edit configurations

I removed the lines from the configuration and all start running.

--module-path
${PATH_TO_FX}
--add-modules
javafx.controls,javafx.fxml

score 0 · Answer 17 · answered Nov 02 '22 at 10:11

0

After I changed everything mentioned in answer, it was still giving me same error. I had to change "Use complier" option from "Eclipse" to "Javac" and it solved the issue for me.

answered Nov 02 '22 at 10:11

MuhammetK

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1
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score 0 · Answer 18 · answered Apr 04 '23 at 09:31

0

Below process worked for me: File -> Project Structure -> Platform Settings -> SDKs -> (ADD JDK Required version either from disk or download it)

answered Apr 04 '23 at 09:31

Boney

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score 0 · Answer 19 · answered Apr 16 '23 at 06:15

May caused by mismatching configuration of your Maven as well as project Structure.

Re-set your project configuration.

IntelliJ IDEA - File - Project Structure - Project Settings

Project: Project language level : please select one (e.g. 8 - Lambdas, type annotations etc.)

Modules: Language Level: please select one same as above. (e.g. 8 - Lambdas, type annotations etc.)

Apply the setting.

Re-upgrade your Maven XML configuration.

confirm your pom.xml file whether contains the properties configure xml code as below or not.

please change the version to '8'.

<properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

Re-load Maven Project by IDEA.

right click pom.xml -> maven -> Reload project.

intellij idea - Error: java: invalid source release 1.9

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