Why won t eclipse switch the compiler to Java 8

Question

I checked out a Java project from SVN in eclipse and realized that it requires Java 8 because it uses lambdas etc  I installed the eclipse addon for Java 8 and restarted eclipse and and have the project set up like so      I noticed that near the bottom  it says that the default compiler compliance is 1 7  so I went into org eclipse jdt core prefs and set the compiler compliance variable to 1 8  as per  this answer  However  in Project -  Preferences -  Java Compiler  it still shows up as     I have set the JRE in Project -  Java Build Path      Yet the compiler refuses to compile lambda expressions - I get an error that looks like what I would get if I went ahead and typed it into Java 7   This is the version of eclipse I m using  Version  Kepler Service Release 1 Build id  20130919-0819   Is the only way to solve this to install a fresh version of Eclipse or am I missing something in the configuration

User · Answer

First of all you should get JdK 8    if you have Jdk installed       you should set its path using cmd prompt or system variables    sometimes it can happen that the path is not set due to which eclipse is unable to get the properties for jdk       Installing latest ecipse luna can solve your problem    i have indigo and luna  i can set 1 8 in luna but 1 7 in indigo Eclipse luna  You can check the eclipse site  it says that the eclipse luna was certainly to associate the properties for jdk 8

User · Answer

You must  install the JDT Eclipse Java 8 Support For Kepler  https   wiki eclipse org JDT Eclipse Java 8 Support For Kepler

User · Answer

It cause eclipse kepler SR1 does not support new Java    8 language enhancements like lambda expression   From information here  http   www eclipse org downloads java8  I think you should use kepler SR2 with support plugin  or change to Eclipse Luna     Updated link 16 09 2016  https   wiki eclipse org JDT Eclipse Java 8 Support For Kepler

User · Answer

First install the JDK1 8 set to Path Open Eclipse and Oper Eclipse Market Place option  Search for jdk 1 8 for kepler Install the required plugin  Restart the eclipse  Change compiler level to 1 8 from preferences  If still there is an error then click on the file and change the compiler setting explicitly to Jdk 1 8

User · Answer

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 version gt 3 6 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           lt  plugins gt       lt  build gt

User · Answer

Two things    First  JRE is not the same as the JDK  If you do have the JDK  you need to configure eclipse to point to that in your settings    Second  in your screenshot above  your compiler compliance level is set to 1 7  This will treat all your code as if it s using Java 1 7  Change this to 1 8 to fix your error   You will need to have Eclipse Luna in order to get support for Java 8  but you can add it to Kepler SR2 if you want  I d try with Luna and the above suggestions before you go any further  See this reference   Once you get Luna  your JAVA HOME variable should be enough to get Eclipse to recognize JDK 8  If you want to specify an additional JDK  you can add a new Java System Library by going to   Project - gt  Properties - gt  Java Build Path - gt  Libraries - gt  Add Library - gt  Java System Library   and navigating to a valid location for the JDK 8   You can download your platform s JDK 8 here

User · Answer

Old question  but posting the answer incase it helps someone  Already build path was configured to use JDK 1 2 81 However  build was failing with the error below    lambda expressions are not supported in -source 1 5  ERROR     use -source 8 or higher to enable lambda expressions    In the latest Eclipse  Photon   adding the below entry to pom xml worked      lt properties gt       lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt       lt maven compiler target gt 1 8 lt  maven compiler target gt       lt maven compiler source gt 1 8 lt  maven compiler source gt     lt  properties gt

User · Answer

This is a old topic but I just wanted to point out that I have searched enough to find that Indigo version can t be updated to S E 1 8  here the link which is given on eclipse website to update the Execution Environment but if you try it will throw error for Indigo   Image  wiki eclipse org File ExecutionEnvironmentDescriptionInstallation png this is the link where the Information about execution environment is given   https   wiki eclipse org JDT Eclipse Java 8 Support For Kepler This shows the step by step to update Execution environment   I have tried to update Execution environment and I got the same error

User · Answer

Assuming you have already downloaded Jdk 1 8   You have to make sure your eclipse version supports Jdk 1 8   Click on  Help  tab and then select  Check for Updates    Try again

User · Answer

I had the same problem even though I had    a freshly downloaded JDK 1 8 0 JAVA HOME is set java -version on command line reports 1 8 Java in control panel is set to 1 8 downloaded Eclipse Mars   Eclipse only let me choose a compiler compliance level op to 1 7 in the compiler preferences  even though my installed JRE is 1 8 0   I also couldn t see a 1 8 in the Execution Environments underneath Installed JREs  only a JavaSE-1 7  which I haven t even got installed     When I clicked on that  it shows  jdk1 8 0  as a compatible JRE  so I selected that  but still no change   Then I unzipped Eclipse Mars into a brand new directory  created a new project  and now I can select 1 8  hurrah   That greatly reduced the  Duplicate methods named spliterator     errors I was getting when compiling my code under Java 1 8  however  there is still one left   Duplicate default methods named spliterator with the parameters    and    are inherited from the types List and Set   However  that s likely because I m extending AbstractList and implementing Set  so I ve fixed that for now by removing the implements Set because it doesn t really add anything in my case  other than signifying that my collection has only unique elements

User · Answer

I had the similar problem with eclipse kepler I have followed these steps to resolve it   Go to Help in Eclipse and Oper Eclipse Market Place option  Search for jdk 1 8 for kepler Install the required plugin  Restart the eclipse    for reference  refer this link http   techno-terminal blogspot in 2016 05 jdk-18-compiler-compliance-is-not html

[java] Why won't eclipse switch the compiler to Java 8?

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