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

User · Answer

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

User · Answer

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

User · Answer

When using maven project   check pom xml file   lt properties gt       lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt       lt project reporting outputEncoding gt UTF-8 lt  project reporting outputEncoding gt       lt java version gt 9 lt  java version gt   lt  properties gt    if you have jdk 8 installed in your machine  change java version property from 9 to 8

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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   lt properties gt       lt java version gt 8 lt  java version gt    The default was 11  lt  properties gt   Make sure to Load maven changes else the change won t reflect

User · Answer

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

User · Answer

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

User · Answer

I have had the same problem  There is an answer    1 CTRL   ALT   SHIFT   S    Then go to  Modules    Dependencies  Change  Module SDK      Got it  Now u have Java 9

[java] intellij idea - Error: java: invalid source release 1.9

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