fixing java.lang.NoClassDefFoundError: javax/el/ELContext error

I got the error java.lang.NoClassDefFoundError: javax/el/ELContext  when i was trying to run a unit test.

Solution:
el-api.jar needs to be in your class path. This is usually found in the tomcat/lib dir. I usually add everything in the tomcat lib to my classpath

select from two tables into a single column

delete from user where id not in (select a.id from person a UNION select b.id from merchant b)

Test mysql connection

mysql -u user -p -h 10.0.0.0