I am seeing exceptions in our monitoring system (New Relic) with regards to LockTimeOutExceptions generating error 500 pages. These are caused by pages being rendered too slow (our problem).

However I do not see those errors in the magnolia log, which I would expect.

Some investigation turns up that info.magnolia.module.cache.filter.CacheFilter#doFilter catches a info.magnolia.module.cache.exception.MgnlLockTimeoutException and logs a warning in that case.

The code that is supposed to throw that exception in info.magnolia.module.cache.ehcache.EhCacheWrapper#get is faulty.
The get() call on ehcache is outside of the try/catch instead of in it.
The code inside the try/catch is just returning the result object and will never throw a LockTimeoutException.

This means the MgnlLockTimeoutException will never be thrown.
Therefore there will be no magnolia log messages.