Invoking Java main method with parameters from Eclipse

Question

During development  and for debugging  it is very useful to run a Java class  public static void main String   argv   method directly from inside Eclipse  using the Run As context menu    Is there a similarily quick way to specify command line parameters for the run  What I do now is go to the  Run Dialog   click through the various settings to the tab where I can specify VM and program arguments and enter them there   Too many steps  plus I do not want to mix the more permanent runtime configuration settings with the one-off invokation parameters  What I want instead is to check a box somewhere  or have a separate menu item  Run as Java application with command line   and then be prompted for the commandline every time  with a nice history

User · Answer

I m not sure what your uses are  but I find it convenient that usually I use no more than several command line parameters  so each of those scenarios gets one run configuration  and I just pick the one I want from the Run History   The feature you are suggesting seems a bit of an overkill  IMO

User · Answer

Uri is wrong  there is a way to add parameters to main method in Eclipse directly  however the parameters won t be very flexible  some dynamic parameters are allowed   Here s what you need to do    Run your class once as is  Go to Run - gt  Run configurations    From the lefthand list  select your class from the list under Java Application or by typing its name to filter box  Select Arguments tab and write your arguments to Program arguments box  Just in case it isn t clear  they re whitespace-separated so  a b c   without quotes  would mean you d pass arguments a  b and c to your program  Run your class again just like in step 1    I do however recommend using JUnit wrapper class just like Uri did say since that way you get a lot better control over the actual parameters than by doing this

User · Answer

Uri is wrong  there is a way to add parameters to main method in Eclipse directly  however the parameters won t be very flexible  some dynamic parameters are allowed   Here s what you need to do    Run your class once as is  Go to Run - gt  Run configurations    From the lefthand list  select your class from the list under Java Application or by typing its name to filter box  Select Arguments tab and write your arguments to Program arguments box  Just in case it isn t clear  they re whitespace-separated so  a b c   without quotes  would mean you d pass arguments a  b and c to your program  Run your class again just like in step 1    I do however recommend using JUnit wrapper class just like Uri did say since that way you get a lot better control over the actual parameters than by doing this

User · Answer

Another idea   Place all your parameters in a properties file  one parameter   one property in this file   then in your main method  load this file  using Properties load  fileInputStream     So if you want to modify one argument  you will just need to edit your args properties file  and launch your application without more steps to do     Of course  this is only for development purposes  but can be really helpfull if you have to change your arguments often

User · Answer

If have spaces within your string argument  do the following   Run   Run Configurations   Java Application   Arguments   Program arguments   Enclose your string argument with quotes Separate each argument by space or new line

User · Answer

I m not sure what your uses are  but I find it convenient that usually I use no more than several command line parameters  so each of those scenarios gets one run configuration  and I just pick the one I want from the Run History   The feature you are suggesting seems a bit of an overkill  IMO

User · Answer

Another idea   Place all your parameters in a properties file  one parameter   one property in this file   then in your main method  load this file  using Properties load  fileInputStream     So if you want to modify one argument  you will just need to edit your args properties file  and launch your application without more steps to do     Of course  this is only for development purposes  but can be really helpfull if you have to change your arguments often

User · Answer

AFAIK there isn t a built-in mechanism in Eclipse for this   The closest you can get is to create a wrapper that prompts you for these values and invokes the  hardcoded  main  You then get you execution history as long as you don t clear terminated processes  Two variations on this are either to use JUNit  or to use injection or parameter so that your wrapper always connects to the correct class for its main

User · Answer

AFAIK there isn t a built-in mechanism in Eclipse for this   The closest you can get is to create a wrapper that prompts you for these values and invokes the  hardcoded  main  You then get you execution history as long as you don t clear terminated processes  Two variations on this are either to use JUNit  or to use injection or parameter so that your wrapper always connects to the correct class for its main

User · Answer

Another idea   Place all your parameters in a properties file  one parameter   one property in this file   then in your main method  load this file  using Properties load  fileInputStream     So if you want to modify one argument  you will just need to edit your args properties file  and launch your application without more steps to do     Of course  this is only for development purposes  but can be really helpfull if you have to change your arguments often

User · Answer

I m not sure what your uses are  but I find it convenient that usually I use no more than several command line parameters  so each of those scenarios gets one run configuration  and I just pick the one I want from the Run History   The feature you are suggesting seems a bit of an overkill  IMO

User · Answer

AFAIK there isn t a built-in mechanism in Eclipse for this   The closest you can get is to create a wrapper that prompts you for these values and invokes the  hardcoded  main  You then get you execution history as long as you don t clear terminated processes  Two variations on this are either to use JUNit  or to use injection or parameter so that your wrapper always connects to the correct class for its main

User · Answer

If have spaces within your string argument  do the following   Run   Run Configurations   Java Application   Arguments   Program arguments   Enclose your string argument with quotes Separate each argument by space or new line

User · Answer

This answer is based on Eclipse 3 4  but should work in older versions of Eclipse   When selecting Run As     go into the run configurations   On the Arguments tab of your Java run configuration  configure the variable   string prompt  to appear  you can click variables to get it  or copy that to set it directly    Every time you use that run configuration  name it well so you have it for later   you will be prompted for the command line arguments

User · Answer

AFAIK there isn t a built-in mechanism in Eclipse for this   The closest you can get is to create a wrapper that prompts you for these values and invokes the  hardcoded  main  You then get you execution history as long as you don t clear terminated processes  Two variations on this are either to use JUNit  or to use injection or parameter so that your wrapper always connects to the correct class for its main

User · Answer

I m not sure what your uses are  but I find it convenient that usually I use no more than several command line parameters  so each of those scenarios gets one run configuration  and I just pick the one I want from the Run History   The feature you are suggesting seems a bit of an overkill  IMO

User · Answer

Another idea   Place all your parameters in a properties file  one parameter   one property in this file   then in your main method  load this file  using Properties load  fileInputStream     So if you want to modify one argument  you will just need to edit your args properties file  and launch your application without more steps to do     Of course  this is only for development purposes  but can be really helpfull if you have to change your arguments often

User · Answer

This answer is based on Eclipse 3 4  but should work in older versions of Eclipse   When selecting Run As     go into the run configurations   On the Arguments tab of your Java run configuration  configure the variable   string prompt  to appear  you can click variables to get it  or copy that to set it directly    Every time you use that run configuration  name it well so you have it for later   you will be prompted for the command line arguments

User · Answer

Uri is wrong  there is a way to add parameters to main method in Eclipse directly  however the parameters won t be very flexible  some dynamic parameters are allowed   Here s what you need to do    Run your class once as is  Go to Run - gt  Run configurations    From the lefthand list  select your class from the list under Java Application or by typing its name to filter box  Select Arguments tab and write your arguments to Program arguments box  Just in case it isn t clear  they re whitespace-separated so  a b c   without quotes  would mean you d pass arguments a  b and c to your program  Run your class again just like in step 1    I do however recommend using JUnit wrapper class just like Uri did say since that way you get a lot better control over the actual parameters than by doing this

User · Answer

This answer is based on Eclipse 3 4  but should work in older versions of Eclipse   When selecting Run As     go into the run configurations   On the Arguments tab of your Java run configuration  configure the variable   string prompt  to appear  you can click variables to get it  or copy that to set it directly    Every time you use that run configuration  name it well so you have it for later   you will be prompted for the command line arguments

User · Answer

This answer is based on Eclipse 3 4  but should work in older versions of Eclipse   When selecting Run As     go into the run configurations   On the Arguments tab of your Java run configuration  configure the variable   string prompt  to appear  you can click variables to get it  or copy that to set it directly    Every time you use that run configuration  name it well so you have it for later   you will be prompted for the command line arguments

User · Answer

Uri is wrong  there is a way to add parameters to main method in Eclipse directly  however the parameters won t be very flexible  some dynamic parameters are allowed   Here s what you need to do    Run your class once as is  Go to Run - gt  Run configurations    From the lefthand list  select your class from the list under Java Application or by typing its name to filter box  Select Arguments tab and write your arguments to Program arguments box  Just in case it isn t clear  they re whitespace-separated so  a b c   without quotes  would mean you d pass arguments a  b and c to your program  Run your class again just like in step 1    I do however recommend using JUnit wrapper class just like Uri did say since that way you get a lot better control over the actual parameters than by doing this

[java] Invoking Java main method with parameters from Eclipse

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