extracted interfaces in DAO and services layers, moved to java configuration of spring. DAO now uses JdbcTeamplate
dependencies fixed and added spring-jdbc
Added spring context, autowiring beans, removed singletons
Fix connection lock, removed unused
Refactoring, extract abstract spring servlet
Extract interfaces for Dependency Injection by Spring
Extract interfaces for Dependency Injection by Spring
Autowiring beans
Extract services interfaces for Dependency Injection by Spring
Empty implementation
Entity, jpa context
Merge branch jpa