Fatal error compiling invalid target release 1 8 - Help 1

Question

Similar problem like one posted on invalid target release  1 7 but after following the blog my problem is still unresolved      Failed to execute goal org apache maven plugins maven-compiler-plugin 3 1 compile  default-compile  on project hm app  Fatal error compiling  invalid target release  1 8 -   Help 1    I was following as tutorial when I faced this problem   abt java  amp  mvn  C  mvn gt echo  JAVA HOME   C  mvn gt echo  JRE HOME  C  mvn gt echo  MAVEN HOME  yields   outputs  C  Program Files Java jdk1 7 0 51 C  Program Files Java jre7 C  apache-maven-3 0 4

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In my case the maven  Run configuration  was using the wrong JRE  1 7   Be sure to check Run -  Run Configurations -   Tab  JRE to be some jdk1 8 x

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Do a force Maven Update which will bring the compatible 1 8 Jar Versions and then while building  update the JRE Versions in Execute environment to 1 8 from Run Configurations and hit RUN

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If you are using Eclipse IDE then go inside Window menu and select preferences and there you search for installed JREs and select the JRE you need to build the project

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Using IntelliJ I just had to install another  higher  JDK Version  After restarting IDE  everything worked and even all dependencies were solved

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The problem I was facing was that I was able to make a maven build from the command prompt but not from Eclipse What worked for me in eclipse is that I changed the run configuration to point to JRE folder inside of JDK rather than leaving it in JDK folder only as per the standard This solution may work for you as well but try this if and only if all the java paths are correct  java and javac are showing the same version as present in the target of pom xml

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On Windows machine you can temporarily set Java version  For example  to change the version to Java 8  run this command on cmd    set JAVA HOME C       jdk1 8 0 65

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Put the value in the plugin    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 1 lt  version 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    The error was use    lt source gt   java version  lt  source gt   lt target gt   java version  lt  target gt

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I faced this issue deploying on Dokku  for some reason it was choosing JDK 1 7  Creating a system properties file and setting java runtime version 1 8 solved the issue  Dokku now uses Java version 8  Choosing a JDK on Heroku   I Never had to do it before

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For eclipse here is how I solved my problem    Preferences --  Compiler --  Compiler Complainer Level  Change to 1 8   Perferences --  Installed JREs --  select JAVA SE 8 1 8  Rebuild via maven using Run as maven build    It shouldn t show you the invalid target error anymore   Note  I didn t have to set or change any other variables in my terminal  Hope this helps

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In my case  IntelliJ   I needed to check if I had the right Runner for maven   Preferences Build  Execution  Deployment Maven - gt  Runner

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You have set your  JAVA HOME to jdk 1 7  but you are trying to compile using 1 8  Install jdk 1 8 and make sure your  JAVA HOME points to that or drop the target release to 1 7       invalid target release  1 8   The target release refers to the jdk version

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The issue was resolved as I was having a JDK pointing to 1 7 and JRE pointing to 1 8  Check in the command prompt by typing java -version  and javac -version  Both should be same

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This question wasn t asking explicitly about Docker  but I received the same error when I had a pom xml file that was targeting 1 9      lt properties gt     lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt     lt maven compiler source gt 1 9 lt  maven compiler source gt     lt maven compiler target gt 1 9 lt  maven compiler target gt   lt  properties gt        but then tried to run tests against a Docker container by specifying  maven  by itself    docker run -t --rm -v m2 repository  root  m2 repository -v   pwd   work -w  work maven mvn -e test   For me  the fix was to target the exact version I needed   docker run -t --rm -v m2 repository  root  m2 repository -v   pwd   work -w  work maven 3 5 2-jdk-9 mvn test    You can learn more here

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What worked in my case is this   I opened the pom xml and replaced the one of the plug-ins as below    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 2 lt  version gt       lt configuration gt           lt source gt 1 7 lt  source gt           lt target gt 1 7 lt  target gt       lt  configuration gt   lt  plugin gt    Before I edited the source and target tags both had 1 8  I changed that to 1 7 and it worked

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As mentioned by Camila Macedo - you have to explicitly point the java version for compiler-plugin  For spring boot you can do that by next property      lt properties gt       lt java version gt 1 8 lt  java version gt       lt maven compiler release gt 8 lt  maven compiler release gt     lt  properties gt

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Putting that in your  profile will dynamically take care of your  JAVA HOME  export JAVA HOME    usr libexec java home    Close your shell afterwards  open a new one and test with  echo  JAVA HOME   It should display something like   Library Java JavaVirtualMachines jdk1 8 0 121 jdk Contents Home   If not  remove any other assignments of JAVA HOME in your startup scripts  Remember  that these startup scripts start with a   so they are hidden and won t be included when using   wildcard  e g  if you want to grep all files of your home directory  you need to   grep -s JAVA HOME      --exclude  bash history

[java] Fatal error compiling: invalid target release: 1.8 -> [Help 1]

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