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Why Oracle still supports PL/SQL when they integrated Java into Oracle RDBMS?

You can find this out at Oracle Technology Network, but here's a small primer:

PL/SQL is still native and preferred programming language for Oracle application development. PL/SQL codebase is already massive and expands each day. Oracle will not dump PL/SQL in favor of Java because PL/SQL is best suited for database programming, while Java is a general purpose language. Adding Java support into Oracle8i expanded the horizon for Oracle developers giving them new powerful tool for developing applications, but Java is not a replacement for PL/SQL, it's a valuable addition to it.