Update to Java 8 regarding the library/API usage #1154
Description
simonharrer
Issue body actions
- Java IO with Java NIO (File -> Path) (available since Java 7)
- Reason: more type checking instead of String parsing, more exceptions instead of indicating failure through a boolean return type
- Date/Calendar with java.time (available since Java 8)
- Reason: java.time uses immutable constructs, whereas Date/Calendar has state and is probably the worst Java api ever
- Use prepared statements instead of simple Strings (available since quite a long time) of the JDBC API
- Use Optional instead of returning null
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