Richard Warburton

Java 8, now what?

What you'll need to know to start your Java 8 migration process today

There was recently a thread on the London Java Community mailing list about when people should think about adopting Java 8. Lambdas, an improved collections library, new date and time support, and a host of under-the-hood tweaks, add up to a lot of compelling reasons for people to upgrade. There’s still a lot of confusion over when and how to accomplish it, though, so here’s a helpful guide.

When will Java 8 be released?

The GA (General Availability) release of Oracle’s JRE and JDK, which is probably the JVM that you’re using, released March 18th. It may take other JVM vendors a while to release their implementations if you aren’t using an OpenJDK or the Oracle JDK.

So I should just upgrade on release date, right?

That would be a very brave move to make. A huge amount of resources go into testing Java 8 and ensuring that things will work out of the box on the day of release. However, the massive ecosystem of Java libraries means that not everything can be tested to destruction in time. It’s incredibly likely that there will be outstanding bugs upon release. You should expect update releases a month or two after GA, they’ll solve the major problems.

It’s also important to think about what libraries or frameworks your application depends on. If you’re just writing plain old Java then an existing codebase is likely to work fine. If, on the other hand, you depend on a library or framework that tries to do something clever then you may run into problems.

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