PostgreSQL JDBC Driver on tomcat8 - Shammer's Philosophy

I setup DB Application on tomcat8, host OS is Debian Jessie and JavaVM is OpenJDK 1.7.0_151.
At first, I used JDBC Driver which can be installed with apt-get, but it doesn't work fine. I saw a stack trace which is began with "java.lang.AbstractMethodError: org.postgresql.jdbc3g.Jdbc3gConnection.isValid()".
Some user faced with the same problem, but no one seems to be able to resolve.

https://stackoverflow.com/questions/27175886/jdbc-connect-with-progresql
https://www.postgresql.org/message-id/20070305183448.39990.qmail%40web36804.mail.mud.yahoo.com

This error was caused by using wrong JDBC Driver. The guideline which JDBC driver should be used is provided by postgresql, the link is https://jdbc.postgresql.org/download.html.

According to this site, the JDBC Driver 4.1 should be used on OpenJDK 1.7.0_151. The filename is postgresql-42.2.2.jre7.jar. Downloading this file and saving this file at /usr/share/tomcat8/lib on my Debian Jessie and restarting tomcat8 made the problem resolved.

I learned it is not good idea to depend on the apt-get.