Java 8 orelsethrow

- Java 8 orelsethrow exception with message
- Java 8 orelsethrow custom exception
- Java 8 orelsethrow with message
- Java 8 optional orelsethrow
- Java 8 stream orelsethrow
- Java 8 optional orelsethrow example
- Java 8 optional orelsethrow with message
- Java 8 findfirst orelsethrow example
- Java 8 optional ofnullable orelsethrow
- Java 8 optional