osgi and equinox-阅读笔记

The?system bundle?is a special bundle that represents the OSGi framework itself, from within that framework. It has the following roles:

• Exports packages from the JRE (excluding?java.*), for example?javax.swing,?org.w3c.com?etc.
• Exports the OSGi framework packages such as?org.osgi.framework.
• Stopping the system bundle has the effect of shutting down the OSGi framework.
• Updating the system bundle has the effect of restarting the OSGi framework (requires support from the launcher).

  The system bundle always has a bundle id of 0 (zero), so in code we can safely obtain a reference to it as follows:

  Bundle systemBundle = context.getBundle(0);