Is it safe to compile againts later JDK? : <p>I have some big projects running on Java 6. But I plan to start building them in Java 8 since a lot of build tools have moved away from Java 6.</p>

<p>Is it safe for me to simply compile them with Java 8 and then deploy them in a web container running Java 8? If not, what are the considerations?</p>

<p>FYI, they don't have a proper automated test suite in place.</p>
