Open multiple Eclipse workspaces on the Mac

Question

How can I open multiple Eclipse workspaces at the same time on the Mac   On other platforms  I can just launch extra Eclipse instances  but the Mac will not let me open the same application twice  Is there a better way than keeping two copies of Eclipse

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Launch terminal and run open -n  Applications Eclipse app for a new instance

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A more convenient way    Create an executable script as mentioned above      bin sh  cd  Applications Adobe  Flash  Builder  4 6  open -n Adobe  Flash  Builder  4 6 app In you current instance of Flashbuilder or Eclipse  add a new external tool configuration   This is the button next to the debug run profile buttons on your toolbar   In that dialog  click on  Program  and add a new one   Give it the name you want and in the  Location  field  put the path to the script from step 1    Users username bin flashbuilder You can stop at step 2  but I prefer adding a custom icon to the toolbar   I use a the Quick Launch plugin to do that   http   sourceforge net projects quicklaunch files  After adding the plugin  go to  Run -  Organize Quick Lauches  and add the external tool config from step 2   Then you can configure the icon for it  After you save that  you ll see the icon in your toolbar   Now you can just click it every time you want a new Flashbuilder Eclipse instance

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If you re like me  you probably have terminal running most of the time as well   You could just create an alias in  Users   bash profile like this alias eclipse  open -n path to eclipse app   then all you have to do is just open the terminal and type eclipse

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This seems to be the supported native method in OS X  cd  Applications eclipse   open -n Eclipse app  Be sure to specify the  quot  app quot  version  directory   in OS X Mountain Lion erroneously using the symbolic link such as open -n eclipse  might get one GateKeeper stopping access    quot eclipse quot  can t be opened because it is from an unidentified developer  Your security preferences allow installation of only apps from the Mac App Store and identified developers   Even removing the extended attribute com apple quarantine does not fix that  Instead  simply using the  quot  app quot  version will rely on your previous consent  or prompt you once    quot Eclipse quot  is an application downloaded from the Internet  Are you sure you want to open it

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Window - gt  New Window   This opens a new window and you can then open another project in it  You can use this as a workaround hopefully    It actually allows you to work in same workspace

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Actually a much better  GUI  solution is to copy the Eclipse app to e g  Eclipse2 app and you ll have two Eclipse icons in Dock as well as Eclipse2 in Spotlight  Repeat as necessary

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You can run multiple instances of Eclipse by creating a pseudonym for Eclipse application in it s folder and using it for running new Eclipse instance

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2018 Update since many answers are no longer valid OS X Heigh Sierra  10 13  with Eclipse Oxygen Go to wherever your Eclipse is installed  Right-click - gt  Show Package Contents - gt  Contents - gt  MacOS - gt  Double-click the executable called eclipse A terminal window will open and a new instance of eclipse will start  Note that if you close the terminal window  the new Eclipse instance will be closed also   To make your life easier  you can drag the executable to your dock for easy access

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EDIT  Milhous s answer seems to be the officially supported way to do this as of 10 5  Earlier version of OS X and even 10 5 and up should still work using the following instructions though      Open the command line  Terminal  Navigate to your Eclipse installation folder  for instance     cd  Applications eclipse  cd  Developer Eclipse Eclipse app Contents MacOS eclipse cd  Applications eclipse Eclipse app Contents MacOS eclipse cd  Users  lt usernamehere gt  eclipse jee-neon Eclipse app Contents MacOS  Launch Eclipse    eclipse  amp    This last command will launch eclipse and immediately background the process   Rinse and repeat to open as many unique instances of Eclipse as you want     Warning  You might have to change the Tomcat server ports in order to run your project in different multiple Tomcat instances  see Tomcat Server Error - Port 8080 already in use

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By far the best solution is the OSX Eclipse Launcher presented in http   torkild resheim no 2012 08 opening-multiple-eclipse-instances-on html It can be downloaded in the Marketplace http   marketplace eclipse org content osx-eclipse-launcher  UGWfRRjCaHk   I use it everyday and like it very much  To demonstrate the simplicity of usage just take a look at the following image

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I found this solution a while back  can t remember where but it still seems to work well for me   Create a copy of Eclipse app for each workspace you want to work in  for this example ProjectB app   then open ProjectB app Contents MacOS eclipse ini and add these two lines at the beginning of the file   -data  Users eric Workspaces projectb       substituting where your workspace is located  When you launch ProjectB app it will automatically start with that workspace instead of prompting for a location  and you should be able to run it at the same time as other Eclipse instances with no problem

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You can create an AppleScript file to open Eclipse with a given workspace  You can even save the AppleScript file as an Application  which is equivalent to creating an alias with arguments in Windows OS   Open Script Editor and type the following   do shell script  open   path to your Eclipse installation  -n --args -data  path to your workspace    For instance   do shell script  open   Applications Eclipse app  -n --args -data  MyWorkspaces Personal     Press the Run button to check it s working   This script can be saved as such  but I prefer to save it as an Application  That way I can customize the icon by copying the   icns icon from the original Eclipse app bundle to the script application bundle   To open an App folder  use the  see contents  contextual menu option  It should look like this     Where  main scpt  is the AppleScript file and  applet icns  is the icon from the original Eclipse bundle

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Based on a previous answer that helped me  but different directory   cd  Applications Eclipse app Contents MacOS   eclipse  amp    Thanks

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Lets try downloading this in your eclipse on Mac you will be able to open multiple eclipse at a time Link Name   macOS Eclipse Launcher Steps    Go to eclipse Market place  Search for  quot macOS Eclipse Launcher quot  and install  It will restart   Now under file menu check for open option  gt  there you will find other projects to open also at same time

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Instead of copying Eclipse app around  create an automator that runs the shell script above   Run automator  create Application   choose Utilities- Run shell script  and add in the above script  need full path to eclipse   Then you can drag this to your Dock as a normal app   Repeat for other workspaces   You can even simply change the icon - https   discussions apple com message 699288 messageID 699288  699288

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If the question is how to easily use Eclipse with multiple different workspaces  then you have to use a kludge because shortcuts in OS X do not provide a mechanism for passing command line arguments  for example the  --data  argument that Eclipse takes to specify the workspace   While there may be different reasons to create a duplicate copy of your Eclipse install  doing it for this purpose is  IMNSHO  lame  now you have to maintain multiple eclipse configurations  plugins  etc     In any case  here is a workaround   Create the following script in the  single  Eclipse directory  the directory that contains Eclipse app   and give it a   command  suffix  e g  eclipse-workspace2 command  so that you can create an alias from it      bin sh   open  as suggested by Milhous open -n   dirname  0  Eclipse app --args -data  path to your other workspace   Now create an alias to that file on your desktop or wherever you want it  You will probably have to repeat this process for each different workspace  but at least it will use the same Eclipse installation

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In Terminal simply paste below line and hit enter      Applications Eclipse app Contents MacOS eclipse   exit

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To make this you need to navigate to the Eclipse app directory and use the following command   open -n Eclipse app

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If you want to open multiple workspaces and you are not a terminal guy  just locate the Unix executable file in your eclipse folder and click it   The path to the said file is      Eclipse folder  -  eclipse right click  -  Show package   Contents -  Contents -  MacOs -  eclipse unix executable file    Clicking on this executable will open a separate instance of eclipse

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One another way is just to duplicate only the  Eclipse app  file instead of making multiple copies of entire eclipse directory  Right-Click on the  Eclipse app  file and click the duplicate option to create a duplicate

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This seems to be the supported native method in OS X  cd  Applications eclipse   open -n Eclipse app  Be sure to specify the  quot  app quot  version  directory   in OS X Mountain Lion erroneously using the symbolic link such as open -n eclipse  might get one GateKeeper stopping access    quot eclipse quot  can t be opened because it is from an unidentified developer  Your security preferences allow installation of only apps from the Mac App Store and identified developers   Even removing the extended attribute com apple quarantine does not fix that  Instead  simply using the  quot  app quot  version will rely on your previous consent  or prompt you once    quot Eclipse quot  is an application downloaded from the Internet  Are you sure you want to open it

[eclipse] Open multiple Eclipse workspaces on the Mac

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