formatter plugin skips files for no obvious reason. about formatter-maven-plugin HOT 5 CLOSED

I have figured out part of the problem.  I checked out the source code so I'm 
now looking at the 4-SNAPSHOT build.

This line returns null to "te":
TextEdit te = formatter.format(CodeFormatter.K_COMPILATION_UNIT + 
CodeFormatter.F_INCLUDE_COMMENTS, code, 0, code.length(), 0, lineSeparator);

Using this 'custom' formatter file:
http://maven.apache.org/developers/maven-eclipse-codestyle.xml

When I remove the custom formatter file I get more (minor) issues, but this one 
goes away.  My boss really likes the curly braces on new lines so I'm going to 
debug a little further.  There's a bug somewhere - maybe in Maven's official 
codestyle.xml rules (doubtful) ?

Okay, problem solved:

<setting id="org.eclipse.jdt.core.compiler.source" value="1.7"/>

That was set to 1.5 in the Eclipse export file, but I had it set to 1.7 in the 
options -- this causes te to come back null.

So far as I can tell, this is the only cause to my issue.

It should be noted that my issues only go away completely with version 
.4-SNAPSHOT, 0.3.1 still will not format some files.

Version 0.4 is released