For TransientMortalCacheValue, InternalEntryFactory.createValue(Object, long, long, long , long) was doing the following:

return new TransientMortalCacheValue(v, maxIdle, lifespan, lastUsed, created);

But the TransientMortalCacheValue constructor was like this:

TransientMortalCacheValue(Object value, long created, long lifespan, long maxIdle, long lastUsed)

{ this(value, created, lifespan, maxIdle); this.lastUsed = lastUsed; }

So that factory method was mixing up maxIdle, lastUsed and and created values.
JBMAR externalizer implementations uses this factory method and hence when testing it, the issue arised.