问在尝试获取pdf时，如何在我的java方法上获取null.pdf？

EN

package org.main.bean.models;

import java.util.ArrayList;
import java.util.List;

public class JobDataHolder {



    private String jobMou;

    private List<JobData> jobDataList;

    private String jobMouDescription;

    public List<JobData> getJobDataList() {
        return jobDataList;
    }

    public void setJobDataList(List<JobData> jobDataList) {
        this.jobDataList = jobDataList;
    }

    public String jobPayLink;

    public String getJobPayLink() {
       return "http://MY_WEB_ADDRESS/paygrade/" + this.jobpayGrade + ".pdf";
    }

    public void setJobPayLink(String jobPayLink) {
        this.jobPayLink = jobPayLink;
    }

    public String jobpayGrade;

    public String getJobpayGrade() {
        return jobpayGrade;
    }

    public void setJobpayGrade(String jobpayGrade) {
        this.jobpayGrade = jobpayGrade;
    }

    private String jobSpecialNote;

    public String getJobSpecialNote() {
        return jobSpecialNote;
    }

    public void setJobSpecialNote(String jobSpecialNote) {
        this.jobSpecialNote = jobSpecialNote;
    }

    private String jobStepMessage;

    private String jobMessages;

    public String getJobMessages() {
        return jobMessages;
    }

    public void setJobMessages(String jobMessages) {
        this.jobMessages = jobMessages;
    }

    public String getJobStepMessage() {
        return jobStepMessage;
    }

    public void setJobStepMessage(String jobStepMessage) {
        this.jobStepMessage = jobStepMessage;
    }

    public String getJobMouDescription() {
        return jobMouDescription;
    }

    public void setJobMouDescription(String jobMouDescription) {
        this.jobMouDescription = jobMouDescription;
    }

    public String getJobMou() {
        return jobMou;
    }

    public void setJobMou(String jobMou) {
        this.jobMou = jobMou;
    }

    private String jobName;

    public String getJobName() {
        return jobName;
    }

    public void setJobName(String jobName) {
        this.jobName = jobName;
    }

    public void clear() {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    public void sort(List<JobDataHolder> jobDataArray) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

}