IntelliJ IDEA 13 uses Java 1 5 despite setting to 1 7

Question

Despite specifying JDK 1 7 in all project settings  including in File - gt  Project Structure - gt  Project    Project SDK   the following error is produced by IntelliJ 13 when trying to compile some simple Java 7 code which does use the diamond operator   java  diamond operator is not supported in -source 1 5  use -source 7 or higher to enable diamond operator    Is there any other place in the configuration where the expected -source 7 option should be enabled

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Alternatively  you can apply maven-compiler-plugin with appropriate java version by adding this to your pom xml    lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId 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       lt  plugins gt   lt  build gt

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I had the following property working for me in IntelliJ 2017     lt properties gt           lt java version gt 1 8 lt  java version gt            lt  properties gt

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I managed to fix this by changing settings for new projects   File - gt  New Projects Settings - gt  Settings for New Projects - gt  Java Compiler - gt  Set the version  File - gt  New Projects Settings - gt  Structure for New Projects - gt  Project - gt  Set Project SDK   set language level  Remove the projects  Import the projects

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One more thing that could cause this is having incorrect version of the  lt parent gt  project   In my case it was pointing to a non-existing project and for some reason IntelliJ downgraded version in settings to 1 5 and later when I fixed it  it was still interpreting target code version as 5  despite setting it to 11

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In IntelliJ Community Edition 2019 02  Changing the following settings worked for me   Update File- Project structure- Project Settings- Project- Project Language level to Java 11  update to the java version that you wish to use in your project  using drop down  Update File- Project structure- Project Settings- Modules- Language level Update File- Settings- Build Execution Deployment -  Compiler -  Java Compiler-  Project ByteCode Version to java 11  Update Target version for all the entries under File- Settings- Build Execution Deployment -  Compiler -  Java Compiler-  Per module Byte Code Version

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First  you need to change the  project bytecode version  under File  gt  Settings  Compiler  gt  Java Compiler  Second  do a full rebuild

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File- Project structure- Project Settings- Project- Project Language level  File- Project structure- Project Settings- Modules- Language level  Change level using drop down

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Please check your project module language levels  Project Structure   Project  Project Structure   Modules   module-name   Sources   You might also want to take a look at Settings   Compiler   Java Compiler   Per-module bytecode version   Set also this   File -  Project Structure -  Modules    Sources  next to Paths and Dependencies  and that has a  Language level  option which also needs to be set correctly

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For IntelliJ IDEA 2016 2   I would like to expand upon part of Peter Gromov s answer with an up-to-date screenshot  Specifically this particular part      You might also want to take a look at Settings   Compiler   Java Compiler   Per-module bytecode version    I believe that  at least in 2016 2   checking out different commits in git resets these to 1 5

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I have same problem but with different situation  I can compile without any issue with maven in command line  mvn clean install   but in Intellij I always got  java  diamond operator is not supported in -source 1 5  compile error despite I have set the maven-compiler-plugin with java 1 8 in the pom xml   It turned out I have remote repository setting in my maven s settings xml which the project depends on  but Intellij uses his own maven which doesn t have same setting with my local maven    So my solution was changing the Intellij s maven setting  Settings - gt  Build  execution  Deployment - gt  Maven - gt  Maven home directory  to use the local maven

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In your command line Unix terminal  Go to your project root folder  and do this  find   -type f -name    iml  -exec sed -i    s JDK 1 5 JDK 1 8 g        This will change the language level property in all your project  iml files from java 1 5 to java 1 8

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I tried making changes to Intellij IDEA as below   1   File  gt  gt  Settings  gt  gt  Build  Execution  Deployment  gt  gt  Compiler  gt  gt  Java Compiler  gt  gt  project bytecode version  1 8  gt  gt  Per-module bytecode version  1 8   2   File  gt  gt  Project Structure  gt  gt  Project Settings  gt  gt  Project  gt  gt  SDK   1 8  Project Language   8 - Lambdas File  gt  gt  Project Structure  gt  gt  Project Settings  gt  gt  Modules  gt  gt  abc   Language level  8 - Lambdas   but nothing worked  it reverted the versions to java 1 5 as soon as I saved it   However  adding below lines to root project level  pom xml worked me to resolve above issue   both of the options worked for me   Option 1    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    Option 2    lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId 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       lt  plugins gt   lt  build gt

User · Answer

If nothing of this helps  my case   you can set it in your pom xml  like this    lt properties gt     lt maven compiler source gt 1 7 lt  maven compiler source gt     lt maven compiler target gt 1 7 lt  maven compiler target gt   lt  properties gt    As this cool guy mentioned here  https   stackoverflow com a 25888116 1643465

[java] IntelliJ IDEA 13 uses Java 1.5 despite setting to 1.7

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