Groovy-Eclipse supports both the 2.0, 1.8 compiler , and the 1.7 compiler for Groovy. However, due to Groovy-Eclipse's tight integration with the compiler, only one version of the compiler can be used in the workspace at one time. Switching compiler levels requires a restart.
By default, Groovy-Eclipse comes installed with a 1.7 and 1.8 compiler. This is the compiler that is These are the compilers that are installed when you select the Groovy-Eclipse feature from the Groovy update site:


If you would like to install the 12.80.x compiler, then you must add one of the development update sites to your install manager:For Eclipse 3.6: go to the Eclipse install manager and select the Groovy 2.0 compiler from the extra compilers section of the update site:

Then click Next and follow the instructions to complete the installation. A restart is necessary.
Here are the release update sites for Groovy-Eclipse:
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| 4.2 (Juno) | http://dist. |
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To perform the installation, you must install the latest dev snapshot of
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Compiler levels
After installing Groovy-Eclipse as well as the Groovy Compiler without the extra compilers, the Groovy 1.8 feature (the SDK and m2eclipse integration are optional):

Then click Next > and follow the instructions to complete the installation. A restart is necessary.
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compiler is active by default. And the Groovy 2.0 compiler becomes active after installing the extra compiler.
Specifying compiler level on the command line
As of Groovy-Eclipse 2.5.2, it is possible to specify the compiler level when starting Eclipse from the command line. Just add the following arguments to the command line to start a particular Groovy 1.7 version when running Eclipse:
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| Groovy 1.7 | -groovy.compiler.level 17 |
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| Groovy 1.8 |
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-groovy.compiler.level 18 | |
| Groovy 2.0 | -groovy.compiler.level 20 |
It is possible to run multiple instances of Eclipse at the same time targeting different compiler levels as long as they point to different workspaces.
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Simply click the button and Eclipse will restart automatically. The hyperlink shown on the preference page will navigate you to this wiki page.
Uninstalling the
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0 compiler
You can uninstall the 12.8 0 compiler through the update manager. In the lower right corner of the update manager, there is a link that says What is already installed?:
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Click the link, select the Groovy 12.8 0 compiler, and then click Uninstall...:


Then follow the instructions and restart to complete the uninstallation process. Once the 12.8 0 compiler is uninstalled, you can follow the steps above to reinstall it.
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There are several possibilities for getting support on your Groovy-Eclipse installation. See here for your support options.