Let's consider interface below:

interface MyIntf {
    private int foo(int x) { return x+1; }
}

When it's compiled and resulted class-file is processed by annotation processor the j.l.m.e.Element instance corresponding to the method foo has 'private' and 'default' modifiers as j.l.m.e.Element.getModifiers() method returns. This looks like a bug.

The minimized testcase is attached in order to reproduce, please:
1. Unzip attached archive to some directory on Unix/Linux machine, say A;
2. Modify A/Test61/test.sh by setting JDK_HOME to your JDK root dir;
3. Run A/Test61/test.sh;

This results in following output:
Enclosed element: foo(int) modifiers [private]
Enclosed element: foo(int) modifiers [private, default]

The first line corresponds to annotation processor running against source file.
The second one corresponds to annotation processor running against class file.