all(javaMethods).should(haveNameStartingWithLowerCase()).check(javaClasses);

private ArchCondition<JavaMethod> haveNameStartingWithLowerCase() {
    return new ArchCondition<JavaMethod>("have name starting with lower case") {
        @Override
        public void check(JavaMethod item, ConditionEvents events) {
            boolean satisfied = Character.isLowerCase(item.getName().charAt(0));
            String message = item.getFullName() + " " + Formatters.formatLocation(item.getOwner(), item.getDeclarationLineNumber());
            events.add(new SimpleConditionEvent(item, satisfied, message));
        }
    };
}