With Eclipse installed, open the Window item from the menu bar and select Preferences. Inside the Preferences window, you’ll see the Java item. Open it, and inside you’ll see the Compiler item.

After that, Java development in Eclipse becomes decidedly simpler. That's because once a Maven project is created in Eclipse, the m2eclipse plugin enables a variety of tools, context menus and ...

Without jumping through a few configuration hoops, the antiquated Java 1.5 version persistently remains the default and to fix this you must add a reference to the Maven compiler plugin in the POM.