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Ceph v12.2.5 failed to build deb packages on Ubuntu 18.04 LTS (Bionic).

Error message is on line 1110

Seems like building of libcephfs.jar failed.

Default, the Java version in Ubuntu 18.04 is openjdk-11-*, and actually java-10

jinpu@PC070VEE:~$ java -version
openjdk version "10.0.1" 2018-04-17
OpenJDK Runtime Environment (build 10.0.1+10-Ubuntu-3ubuntu1)
OpenJDK 64-Bit Server VM (build 10.0.1+10-Ubuntu-3ubuntu1, mixed mode)

In JDK 10, source option 1.5 is no longer supported ( https://docs.oracle.com/javase/10/migrate/toc.htm#JSMIG-GUID-77874D97-46F3-4DB5-85E4-2ACB5F8D760B )