@Override
    public <T> JDOUpdateClause setNull(Path<T> path) {
        updates.put(path, Expressions.nullExpression(path));
        return this;
    }
{@link UpdateClause} implementation for JDO

@author tiwe
querydsl-jdo/src/main/java/com/querydsl/jdo/dml/JDOUpdateClause.java