Warning - Build path specifies execution environment J2SE-1 4

Question

I create a Maven project in Eclipse Helios  It works fine for a day  but then this warning shows up      Build path specifies execution environment J2SE-1 4  There are no JREs installed in the workspace that are strictly compatible with this environment     Since this message  the project stopped compiling and debugging  Does anyone have solution for this problem

User · Answer

Whether you re using the maven eclipse plugin or m2eclipse  Eclipse s project configuration is derived from the POM  so you need to configure the maven compiler plugin for 1 6  it defaults to 1 4    Add the following to your project s pom xml  save  then go to your Eclipse project and select Properties   Maven   Update Project Configuration    lt project gt    lt build gt     lt pluginManagement 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 6 lt  source gt               lt target gt 1 6 lt  target gt           lt  configuration gt       lt  plugin gt      lt  plugins gt     lt  pluginManagement gt    lt  build gt   lt  project gt

User · Answer

The actual cause of this warning is that you have configured your project to run with an earlier JRE version then you have installed  Generally this occurs whenever you use old projects with newer JREs    This will likely cause no trouble at all  But if you want to be really on the save side  you should install the correct  old JDK  You can find them here  http   www oracle com technetwork java archive-139210 html  If you then restart eclipse you can go into Window   Preferences   Java   Installed JREs   Execution Environments and set for in your case J2SE-1 4 the  perfect match  as eclipse calls it

User · Answer

the correct procedure to resolve this warning  as other people write  is to go inside your project Properties and click on Java Build Path located on the left  Now you will find inside the Libraries Window the J2SE 1 5  double click on this one and a new window will give you the possibility to choose the correct Excecution Environment  Now select your version and the warning will disappear

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I met the same warning in STS  Spring Tool Suite   if it may help someone somehow  This is the source https   www baeldung com eclipse-change-java-version  and here s a summary of it   Warning   build path specifies execution environment javase-11  there are no jres installed in the workspace that are strictly compatible with this environment  Environment   Ubuntu 20 04  with default OpenJDK11  STS 4 To solve the warning    Change the JRE of the workspace of STS  By default  STS uses the JRE embedded in its plugins    Window gt Preferences gt Installed JREs gt Add gt Standard VM gt Directory  browse to your openjdk folder  in my case  usr lib jvm java-11-openjdk-amd64  gt Finish  Check the new JRE  then Apply and close Now configure the spring-boot project to use the newly added JRE   Right click on the project  gt  properties  gt  Java Build Path  gt  in Libraries tab  gt  Remove the old JRE  then in Modulepath Add Library  gt  JRE System Library  gt  Environments  choose JavaSE-11  make sure to check it on the right panel  mentionned  quot perfect-match quot    Apply and Close  And voil

User · Answer

If you have Java 1 8 then   You need this xml part in pom xml and update project     lt properties gt       lt maven compiler target gt 1 8 lt  maven compiler target gt     lt  properties gt

User · Answer

Just change the version in Window-  Preferences-  Java -  Installed JREs  Check the installed JREs list   Then  Right-click on your project -  properties -  Java build path -  libraries  Change the  JRE System Library  to the version in  installed JREs     The warning will be gone

User · Answer

Expand your project in work space  Right click JRE System Libraries   select properties  selectworkspace default JRE  the above solution sol

User · Answer

I was getting project warning as  Build path specifies execution environment J2SE-1 5  There are no JREs installed in the workspace that are strictly compatible with this environment    I removed the J2SE1 5 library and added new JRE System Library which resolved my problem

User · Answer

The above solutions fix the project or work around the problem in some way  Sometimes you just don t want to fix the project and just hide the warning instead    To do that  configure the contents of the warning panel and make sure to toggle-off the  build path -  JRE System Path Problem  category  The UI for this dialog is a bit complex weird usability challenged so you might have to fiddle with a few of the options to make it do what you want

User · Answer

Did you setup your project to be compiled with 1 4 compliance  If so  do what krock said  Or to be more exact you need to select the J2SE-1 4 execution environment and check one of the installed JRE that you want to use in 1 4 compliance mode  most likely you ll have a 1 6 JRE installed  just check that one  Or install a 1 4 JRE if you have a setup kit  and use that one   Otherwise go to your Eclipse preferences  Java -  Compiler and check if the compliance is set to 1 4  If it is change it back to 1 6  If it s not go to the project properties  and check if it has project specific settings  Go to Java Compiler  and uncheck that if you want to use the general eclipse preferences  Or set the project specific settings to 1 6  so that it s always 1 6 regardless of eclipse preferences

User · Answer

In Eclipse from your project    Right-click on your project Click Properties Java build path  Libraries  Remove the  JRE System Library J2SE 1 4   Click Add Library -  JRE System Library Select the new  Execution Environment  or Workspace default JRE

User · Answer

In eclipse preferences  go to Java- Installed JREs- Execution Environment and set up a JRE Execution Environment for J2SE-1 4

[java] Warning - Build path specifies execution environment J2SE-1.4

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