Possible to have several instances of Eclipse open simultaneously?

I'd like to know if it's possible to have several instances of Eclipse open at the same time. I'm using it for Java development. I know I can have several files from different projects open at the same time (at least that's what it seems to me), but whenever I try to open a second instance it shows me the following message:

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Is there any easy way to have several instances of Eclipse open, each one with a different project?

Thanks

Either create multiple workspaces (Preferences / Startup, tickbox to ask which on every startup)

Or more likely, I think Window / New Window will open a second eclipse viewing window on the same workspace.

yes, each on a different wokspace.

Projects and Workspaces in Eclipse are different. A workspace has a set of global settings and then it has a set of projects.

There are two kinds of project. Projects in the workspace and projects outside the workspace. If you use in the workspace projects (for example, by telling eclipse to make a project via a source control checkout), then it can only be in that workspace.

If you create projects outside the workspace, then you can import each one into as many workspaces as you like.

You can make as many workspaces as you like. Each workspace can be open in only one instance of eclipse.

A better answer to have only the resources from certain project in the new Window is by right clicking the project and select "Open in New Window"

You may want to use Working sets.

A common problem in Eclipse is that your data in your workspace grows and therefore your workspace is not well structured anymore. You can use working sets to organize your displayed projects / data. To setup your working set select in the Package Explorer -> Show -> Working Sets.

I tend to use different workspaces for different contexts, not just working sets. For that none of the answers above is satisfactory, instead you might want to use the "-data" option on the command line. That allows you to specify the workspace to open, if that is different from the already open one, then a new Eclipse instance will be started.

See http://labs.distriqt.com/post/844 for more details.

There is a way. I have several installations of eclipse in separate folders. Each setup for a different language/job and perspective (CF, Java, Birt). Each has its own workspace so they don't interfere with each other. You can work out if your machine can handle the multiple instances.

If I understand well, your problem is that you would like not to see the other projects while working on one. What you could do is close the projects you're not working on, and then in the package explorer, choose filters > closed projects. This way the closed projects no longer appear in the package explorer.

If you want multiple Eclipse instances open on the same workspace (with the same projects) then you want to use 'Window > New Window'. This will even let you drag views from one window to another.

If you want to display different sets of projects in each Eclipse Window then I'd suggest you use set up a 'Working Set' for each combination of projects you want to work with. You can then select a specific working set from within the Package Explorer. You can create working sets using 'File > New > Java Working Set'.

Something else to consider is that a Workspace is more than just a group of projects - preferences are all stored at the Workspace level. This means that it is quite easy for your preferences to get out of sync if you work with multiple Workspaces.