Several Clover databases created during instrumentation are merged into one. Next such merged database is used to run instrumented application. During application startup a following message appears:
ERROR: CLOVER: Unable to load coverage database. ERROR: CLOVER: No coverage data will be gathered. ERROR: CLOVER: com.cenqua.clover.registry.ReadOnlyRegistryException ERROR: CLOVER: This database can only be used for reporting because it is the result of a merge. It does not support further coverage gathering.
It is possible to merge several Clover databases into one in order to have a single coverage report. However, such merged database becomes 'read-only' and cannot be used for further code coverage gathering.
Use original non-merged databases for execution of application module(s).
Alternatively, it's possible to create a single database for several application modules during instrumentation and use just one database at runtime:
- in Maven use the <singleCloverDatabase> parameter
- in Ant setup Clover in master build file and make sure that inheritrefs="true" is used across ant calls.