No worries, I am not easily offended. I could go on about my navigating experience, crisscrossing the Java Sea in a variety of vessels but in less than 0.10 seconds Google came up with about 99 500 results for "java sea depth". See:
"Measuring 900 mi (1,450 km) long by 260 mi (420 km) wide, it occupies a total area of 167,000 sq mi (433,000 sq km). A shallow sea, it has a mean depth of 151 ft (46 m)."
A scientific paper which can be viewed at the link below, states that the depth of the Java Sea ranges from 20 m off the south eastern coast of Sumatra to 60 m at its eastern extremity. The mean is given as 50 m.
You can download "The Java Sea Environment" a 25 page document with excellent charts and bathymetric profiles at: