All of the constructors of ObjectName and all of the static ObjectName.getInstance factory methods are declared to throw MalformedObjectNameException, which is a checked exception. This is very irritating, because it means you can't write for example:

public class Whatever {
    private static final ObjectName mbeanName = new ObjectName("d:type=Foo");
    ...
}

You have to write the much more verbose:

public class Whatever {
    private static final ObjectName mbeanName;
    static {
        try {
            mbeanName = new ObjectName("d:type=Foo");
        } catch (MalformedObjectNameException e) {
            throw new AssertionError(e);
        }
    }
    ...
}

Most people who run into this problem probably define their own factory method that does what the static{} block in the second example does:

    private static final ObjectName mbeanName = Util.newObjectName("d:type=Foo");

but it's stupid that they should have to.