Why is java used by most banks?

I noticed that most banks use java to run web applications on the server side Why? What makes Java better than PHP, ruby, python Etc is better for banks or enterprises?

Thank you in advance

Solution

From the bank's point of view Banks and other large non-technical companies are generally very conservative about technology choices, because the punishment for doing wrong work on some software is very large, but the reward for very good work is not large In other words, there is little reward for software development risk here Therefore, it should stay behind the curve, try and be true, not take the latest and greatest opportunities