I am currently using Eclipse for both Java and Python (with PyDev). I often find that I have one Java project open with lots of files, and then for some reason I have to switch to a Python project for a bit.
I want to leave my Java project the way it is, and I don't just want to open tons of Python files in the same place because then I have too much open at once.
Is there any way I can leave my Java project exactly the way it is, and open a completely new session of Eclipse? (sort of the way you can do with a browser)
You can't make one Eclipse process work with two different workspaces; it's just not possible. You should launch two different Eclipse processes and open a different workspace in each; one workspace can't be used by two different Eclipse processes either.
Go to eclipse Market place. Search for "macOS Eclipse Launcher" and install. It will restart . Now under file menu check for open option > there you will find other projects to open also at same time .
In Window->Preferences->General->Startup and Shutdown->Workspaces, make sure that 'Prompt for Workspace on startup' is checked. Then close eclipse and reopen. Then you'll be prompted for a workspace to open. You can create a new workspace from that dialogue.
If you want two instances accessing two workspaces, just run a second copy of eclipse
If you want two windows accessing the same workspace, you can create a second window with Window -> New Window
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