optaplanner-examples/src/main/java/org/optaplanner/examples/taskassigning/domain/Task.java
public int getMissingSkillCount() {
        if (employee == null) {
            return 0;
        }
        int count = 0;
        for (Skill skill : taskType.getRequiredSkillList()) {
            if (!employee.getSkillSet().contains(skill)) {
                count++;
            }
        }
        return count;
    }
public int getMissingSkillCount() {
        if (employee == null) {
            return 0;
        }
        int count = 0;
        for (Skill skill : taskType.getRequiredSkillList()) {
            if (!employee.getSkillSet().contains(skill)) {
                count++;
            }
        }
        return count;
    }
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