in src/main/java/org/apache/maven/resolver/internal/ant/types/RemoteRepository.java [69:80]
public void validate(Task task) {
if (isReference()) {
getRef().validate(task);
} else {
if (url == null || url.length() <= 0) {
throw new BuildException("You must specify the 'url' for a remote repository");
}
if (id == null || id.length() <= 0) {
throw new BuildException("You must specify the 'id' for a remote repository");
}
}
}