oracle jdbc는 수동으로 repository에 등록해주어야 함.
mvn install:install-file -Dfile=C:\Users/taekg/ojdbc8.jar -DgroupId=com.oracle -DartifactId=ojdbc8 -Dversion=12.2.0 -Dpackaging=jar
<dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc8</artifactId> <version>12.2.0</version> </dependency>