Wrong timezone offset given by java.sql.ResultSet.getTime()

[sfc]

When I'm using java to read a time from MySQL:
          ResultSet r = (SQL query);
          ......
          r.getTime("open_time").getTime()
and this sentence gives different time (1 hour delta) on my server and my laptop (which got wrong time).
The only difference between my server and laptop is timezone. When I changed timezone of my laptop from Asia/Chongqing to Asia/Shanghai as on the server, the time reads correctly.
Then I used r.getTime("open_time").getTimezoneOffset() to check the timezone between Asia/Chongqing and Asia/Shanghai, it gives -420 and -480.
In fact, the whole China is GMT+8, which means Asia/Chongqing and Asia/Shanghai should be the same time.
Other java time functions don't have this problem.

Server:
mysql-server 5.5.35-0ubuntu0.12.04.1
java version "1.7.0_51"
OpenJDK Runtime Environment (IcedTea 2.4.4) (7u51-2.4.4-0ubuntu0.12.04.2)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)

Laptop:
mysql-server 5.5.35-0ubuntu0.13.10.2
java version "1.7.0_51"
OpenJDK Runtime Environment (IcedTea 2.4.4) (7u51-2.4.4-0ubuntu0.13.10.1)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)