Eclipse Frustration with Java 1 7 unbound library

Question

I m having trouble with a brand new project in a brand new installation of Eclipse  Repro steps    Download this version of Eclipse  http   www eclipse org downloads packages eclipse-ide-java-developers heliosr Unzip to c  program files eclipse java Launch Eclipse  choose a workspace File   New   Java Project  Project name  Hello World  JRE   Use an execution environment JRE  JavaSE-1 7  Hit Next  go to the Libraries tab  The only entry is JRE System Library  JavaSE-1 7   unbound   What does  unbound  mean  How do I fix it  Hit Finish    Expected  Brand new project works fine   Actual  There are two errors   The project cannot be built until build path errors are resolved HelloWord  Unknown Java Problem Unbound classpath container   JRE System Library  JavaSE-1 7   in project  HelloWord  HelloWord  Build path Build Path Problem   What am I doing wrong here   Update  Perhaps I don t actually have the Java 7 JDK on my machine  How can I be sure   Update 2  Looks like Java 7 is in fact not out yet  Sweet

User · Answer

Cause   This is common scenario when we import new project with different lib and JAR path    I faced this issue and got resolved using exact following steps    Project   Properties Build Path   Configure Build Path Select  Libraries  tab Click  Add Library  Select  JRE System Library  from displayed list Click on  Next  followed by  Finish  button   This will point your system s proper  amp  valid JRE path  which did thing for me  Cheers

User · Answer

1  Find out where java is installed on your drive  open a cmd prompt  go to that location and run    java -version  to find out the exact version  Or  quite simply  check the add remove module in the control panel   2  After you actually install jdk 7  you need to tell Eclipse about it  Window -  Preferences -  Java -  Installed JREs

User · Answer

Most of the time after the installation of Eclipse eclipse ini is changed  If you change the jdk in eclipse ini then eclipse will use this jdk by default   Let s say you install a new version of Eclipse and you have forgotten to change the eclipse ini related to the jdk  Then Eclipse finds a jdk for you  Let s say it is java 1 6 that was automatically discovered  you did nothing    If you use maven  M2E  and you reference a 1 7 jdk then you will see the frustrating message  But normally it is not displayed because you configure the correct jdk in eclipse ini   That was my case  I made reference into the pom to a jdk that was not configured into Eclipse   In the screenshot you can see that 1 7 is configured and seen by Eclipse  In this case  you should make reference into the pom to a jre that is compatible with 1 7  If not -  frustrating message

User · Answer

Updated eclipse ini file with key value property -Dosgi requiredJavaVersion 1 7  or  1 8 whichever applicable   - it works for me

User · Answer

To set JDK you can watch this video   how to set JDK   Then when you ll have JDK    Right click on build path and select  Build Path  Choose  Configure Build Path  Click on  JRE System Library  JavaSE-1 7   unbound   Edit it Choose  Alternate JRE  Click on  Installed JREs    button Press Add Choose to add  Standard VM  Choose JRE Home directory - usually it is locates in  C  Program Files Java jre7  directory Press  Finish  Re-check newly appeared  Jre7   Verify that now when you edit  JRE System Library  JavaSE-1 7    Alternate JRE  is chosen for jre7

User · Answer

1 Go to configure build path    2 Remove unbound JRE library   3 Add library --  JRE System library    Then project compile and done

User · Answer

Updated eclipse ini file with key-value property   -Dosgi requiredJavaVersion 1 5    to   -Dosgi requiredJavaVersion 1 8   because  that is my JAVA version    Also  selected JRE 1 8 as my project library

User · Answer

Have you actually downloaded and installed one of the milestone builds from https   jdk7 dev java net     You can have a play with the features  though it s not stable so you shouldn t be releasing software against them

[java] Eclipse: Frustration with Java 1.7 (unbound library)

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