Very few wars, if any, pass the conditions that could entitle them to be called "just war".

The conditions of a Just War are:
it must be fought by a legal recognised authority, eg, a government
the cause of the war must be just
the war must be fought with the intention to establish good or correct evil
there must be a reasonable chance of success
the war must be the last resort (after all diplomatic negotiations have been tried and failed)
only sufficient force must be used and civilians must not be involved

About the only war that arguably could be argued to meet these conditions that I can think of might be World War II - and many of the actions carried out by the Allies were in breach of the last condition.