The Big Dictionary of Dreams

by Martha Clarke
Its meaning is associated with that of the BOTTLE. They represent the state of material and spiritual goods. Barrels full of wine indicate richness and well-being. Barrels precede the roar of a bull. This animal is associated with the creative power of spring. Empty or broken barrels signal the fear of ruin, or an economic or spiritual state that leaves much to be desired.

My Dream Interpretation

by myjellybean
If the barrel in your dream was upright, full and/or in good condition, it forecasts financial security. But if it was empty and/or rolling, it suggests you should take measures to protect your position.

Gypsy Dream Dictionary

by Raymond Buckland
Similar to a barn, in that a full barrel indicates plenty and an empty one indicates want.

If you are banging a stopper into a barrel then you need to secure what you have.