Environment variables in Eclipse

Question

I am able to run a sample hadoop program from the command prompt and am trying to run the same program from Eclipse  so that I can debug it and understand it better   For the command line program  some environment variables are set in the  bashrc and the same are being read as System getenv   get  HADOOP MAPRED HOME   in the hadoop program  But  when I am running a java program with System getenv   get  HADOOP MAPRED HOME    from Eclipse I am getting null   I tried passing -DHADOOP MAPRED HOME test to VM parameters in the runtime configurations from Eclipse  but still getting null in the standalone program  How to make the environment variables visible within Eclipse  When I iterate through System getenv   in Eclipse  I see lot of variables like DISPLAY  USER  HOME and others  Where are they set  I am using Ubuntu 11 04

User · Answer

I ve created an eclipse plugin for this  because I had the same problem  Feel free to download it and contribute to it    It s still in early development  but it does its job already for me   https   github com JorisAerts Eclipse-Environment-Variables

User · Answer

The  bashrc file is used for setting variables used by interactive login shells  If you want those environment variables available in Eclipse you need to put them in  etc environment

User · Answer

You can set the Hadoop home directory by sending a -Dhadoop home dir to the VM  To send this parameters to all your application that you execute inside eclipse  you can set them in Window- Preferences- Java- Installed JREs-   select your JRE installation  -  Edit   -   set the value in the  Default VM arguments   textbox   You can replace   HADOOP HOME  with the path to your Hadoop installation

User · Answer

You can also define an environment variable that is visible only within Eclipse   Go to Run -  Run Configurations    and Select tab  Environment      There you can add several environment variables that will be specific to your application

User · Answer

For the people who want to override the Environment Variable of OS in Eclipse project  refer to  MAX answer too   It s useful when you have release project end eclipse project at the same machine   The release project can use the OS Environment Variable for test usage and eclipse project can override it for development usage

User · Answer

You can also start eclipse within a shell     You export the enronment  before calling eclipse   Example       bin bash export MY VAR  ADCA  export PATH   home lala bin  PATH   ECLIPSE HOME eclipse -data  YOUR WORK SPACE PATH   Then you can have multiple instances on eclipse with their own custome environment including workspace

User · Answer

I was able to set the env  variables by sourcing  source command inside the shell  ksh  scirpt  the file that was settign them  Then I called the  ksh script from the external Tools

User · Answer

I was trying to achieve this but in the context of a MAVEN build  As part of my pom xml configuration  I had a reference to an environment variable as part of a path to a local JAR   lt dependency gt     lt groupId gt the group id lt  groupId gt     lt artifactId gt the artifact id lt  artifactId gt     lt version gt the version lt  version gt     lt scope gt system lt  scope gt       lt systemPath gt   env MY ENV VARIABLE  the local jar archive jar lt  systemPath gt   lt  dependency gt   To compile my project  I had to define the environment variable as part of the run configuration for the maven build as explained by Max s answer  I was able to launch the maven compilation and the project would compile just fine  However  as this environment variable involves some dependencies  the default  quot problems quot  view of Eclipse  where compilation errors warnings usually show  would still show errors along the lines of Could not find artifact and systemPath should be an absolute path but is   env MY ENV VARIABLE  the local jar archive jar  How I fixed it Go into Window - gt  Preferences - gt  General - gt  Worksapce - gt  Linked Resources and define a new path variable   Finally  in my case I just needed to Right click on my pom xml file  select Maven - gt  Update Project and the errors disappeared from the  quot Problems quot  view

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