To diagnose OSGi resolver problems it might be useful to turn on OSGi framework's debug level. Apache Felix and Eclipse Equinox have different way to enable and configure the debug options:
To turn on debugging when running with Apache Felix edit the etc/system.properties file and uncomment the following line:
The felix.log.level property can be set to any value between 0 and 4. 4 means maximum log level.
To turn on debugging when running with Eclipse Equinox edit the etc/system.properties file and uncomment the following line:
The osgi.debug property specifies a Equinox property file which contains a number of options for controlling the amount and type of logging generated by the Equinox framework.