Error java invalid source release 8 in Intellij What does it mean

Question

Im trying to compile some code in I m using Intellij Ultimate 13 1 4  but I get the following error and I have no idea what it means   Information Using javac 1 7 0 55 to compile java sources Information java  Errors occurred while compiling module  Example  Information Compilation completed with 1 error and 0 warnings in 3 sec Information 1 error Information 0 warnings Error java  invalid source release  8   My guess is that its something related to Java 8 vs Java 7  but I have no idea what specifically  I ve tried to Google around for this message  but they either talk about javac or target release  so it doesn t exactly seem to apply

User · Answer

If you are using Gradle as a build tool and you get this error when executing a Gradle task i e TomcatRun take a look to my other answer to the same question  javac  invalid target release  1 8

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It can be simply overcome by setting on Project Structure  You just need to select the right path for related version of JDK  Select new on dependencies tab  and choose the path  It s done

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Andreas Lundgren s answer worked and I was able to compile and run my app     However  when I tried to run the project s associated JUnit tests I received the same error   Running   gradle -version   from Windows command prompt showed that gradle was still picking up the incorrect jdk   To fix it I had to set the JAVA HOME environment variable to point to the correct jdk and restart IntelliJ

User · Answer

I had the same issue the solution for me was to change my java version in the pom xml file  I changed it from 11 to 8

User · Answer

Check your pom xml first  if you have one   Check your module s JDK dependancy  Make sure that it is 1 8 To do this go to Project Structure -  SDK s Add the path to where you have stored 1 8  jdk1 8 0 45 jdk in my case  Apply the changes Now  go to Project Structure - Modules Change the Module SDK to 1 8 Apply the changes  Voila  You re done

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I add one more path unmentioned in this answer https   stackoverflow com a 26009627 4609353  but very important is Edit Configurations

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I was recently facing the same problem  This Error was showing on my screen after running my project main file  Error java  invalid source release  11 Follow the steps to resolve this error  File- gt Project Structure - gt  Project Click New button under Project SDK  Add the latest SDK and Click OK    After running You will see error is resolved

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For Grails users  apply these declarations in your BuildConfig groovy file   grails project target level   1 6   or 1 7 1 8 and so on grails project source level   1 6   or 1 7 1 8 and so on

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As Andreas mentioned all about  Error java  invalid source release  8 in IntelliJ Error java  invalid source release  13 in IntelliJ Error java  invalid source release  14 in IntelliJ     OR whatever version you are using in Java    The problem will exist if you do not have it matching inside the below code   lt properties gt       lt maven compiler source gt 1 8 lt  maven compiler source gt       lt maven compiler target gt 1 8 lt  maven compiler target gt   lt  properties gt   This 1 8 in my case  must be matching on your device through MAVEN project library  settings  preferences  project setting and SDK

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You need to click to the project Open Module Settings and change the path of your JDK  if in the file POM you use jdk 1 8  configure jdk 1 8 with correct path

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I had the same issue when  downgrading  a project from Java 8 to Java 6  The reason was that it was not changed at all places in IntelliJ   In IntelliJ 13 1 4 I had to change Java and SDK version on the following places not to get this error    File -  Project Structure -  Project Settings File -  Project Structure -  Module Settings -  Tab  Sources  Language Level File -  Project Structure -  Module Settings -  Tab  Dependencies  Module SDK File -  Settings -  Compiler -  Java Compiler -  Target bytecode version           The last bullet was the one that was not updated in my case  Once I changed this  the error disappeared

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Lots of good answers  For those using the  almost  latest version of Intellij  at the time of writing  what can be said  is that the project JDK can be at a higher level  than that of the module  In fact without it  Maven will have to be rolled back to an older version  Therefore with the following version of Intellij   One should not change the project level JDK and therefore be able to leverage the Maven or Gradle settings when building  but when running Maven or running Gradle using a more modern version of the JDK  If you lower your project level JDK from say JKD8 to JDK6  Maven or Gradle will not run  Keeping your module at a lower level JDK-wise will enable you to build it to that version  if you use the Module rebuild or build options  using the menu options for rebuilding the project will complain wit  quot Invalid source release 8    quot

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I checked all above said project version  module version  project bytecode version  target bytecode version settings in IntelliJ Idea  but all were the same as I scratched   I face this error Error java  invalid source release  1 8 in IntelliJ Idea 2017 2 6 because I upgraded the dependency version Maven pom file  which dependency  were supposed to build for JDK 1 8 application and I were building my application on and with maven compiler source and target JDK 1 7   Hence I again downgrade the dependency version to earlier one in Maven pom  and the error gone after project Rebuild Module  xyz project

User · Answer

I tried out all the steps mentioned in here https   stackoverflow com a 26009627 2058104  but the 4th point has now changed  You need to go to Preferences -  Build  Execution  Deployment -  Compiler -  Java Compiler  In there  as shown in below figure  you need to change the  Target bytecode version   Although  I changed it to 8  since I needed to downgrade to Java 8   it was giving the same error  over and over  Therefore  try to remove the existing entry  in this table  and add it again  This worked for me     On the other hand  clean the project and try to run again

User · Answer

For Gradle users having this issues  if nothing above helps this is what solved my problem - apply this declarations in your build gradle files   targetCompatibility   1 6   or 1 7 1 8 and so on sourceCompatibility   1 6   or 1 7 1 8 and so on   Problem solved

User · Answer

Change in pom xml 1 6 to 1 8   lt plugin gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt configuration gt           lt source gt 1 8 lt  source gt           lt target gt 1 8 lt  target gt       lt  configuration gt   lt  plugin gt

[java] Error:java: invalid source release: 8 in Intellij. What does it mean?

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