Java – Downloading Eclipse plug-in from Eclipse Marketplace for offline usage

Eclipse offers a way of mirroring these sites automatically, either through the command line or through ant tasks.

Mirror based on p2 information

$eclipse_home/eclipse -application org.eclipse.equinox.p2.artifact.repository.mirrorApplication -source $1 -destination $2
$eclipse_home/eclipse -application org.eclipse.equinox.p2.metadata.repository.mirrorApplication -source $1 -destination $2

Reference: Equinox p2 repository mirroring

Mirror based on site.xml information

java -jar $eclipse_home/plugins/org.eclipse.equinox.launcher_*.jar -application org.eclipse.update.core.standaloneUpdate -command mirror -from $from -to $to

Reference: Running the update manager from the command line

You can follow the evolution of these scripts in my script repository.

I've just encountered exactly the same problem in Eclipse 3.6 (Helios). After plenty of Googling I came across this link:

http://code.google.com/intl/es/eclipse/docs/faq.html#wstinstallerror

During installation, there's an error about requiring org.eclipse.wst.sse.ui. How do I fix that?

The Google Plugin for Eclipse depends on other specific Eclipse components, such as WST. Your installation of Eclipse may not yet include all of them, but they can be easily installed by following these instructions. Eclipse 3.6 (Helios)

1. Select Help > Install New Software...
2. Click the link for Available Software Sites.
3. Ensure there is an update site named Helios. If this is not present, click Add... and enter http://download.eclipse.org/releases/helios for the Location.
4. Now go through the installation steps; Eclipse should download and install the plugin's dependencies.

(There are examples in that page for 3.5 (Galileo), 3.4 (Ganymede) & 3.3 (Europa) for anyone with different versions)

The exact same steps work for 3.7 (Indigo) as well.

Just use http://download.eclipse.org/releases/indigo for the location.

Juno: http://download.eclipse.org/releases/juno

Kepler: http://download.eclipse.org/releases/kepler

Note: Step four is not necessary. Only steps one to three are necessary.