Java 1.6 is also known as Java 6, Java 1.7 is also known as Java 7.
The Visual COBOL for Eclipse uses the Eclipse 3.8 framework and is known compatible with Java 1.6 or Java 6, or Java 1.7. or Java 7. You can try the Java 1.8 or Java 8 download, but if that is problematic, try the 1.7 or 7 download. It is also available from Oracle on the same page. Look for Java SE 7u75/76.