Source: The Great Interpretation of Dreams (Ibn Sirin)
Justice in a dream indicates righteousness in religion and worldly life, and salvation from injustice. Whoever sees himsel judging justly between people will gain exaltation and a position.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Justice indicates following the truth. It indicates security and prosperity.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Justice is interpreted as goodness and blessing. Whoever sees himself being just will attain goodness.