java.lang.UnsupportedOperationException: Not supported yet

Hello All,

I am facing with "java.lang.UnsupportedOperationException: Not supported yet."

on my code

private Map<String, Object> session;

public String execute() {
Object list = session.get("mylist"); // this line thrown "java.lang.UnsupportedOperationException: Not supported yet."

could any body please help?

thanks & regards
Luc

map is an interface, which declare a method get. which implementing class do you use? it looks like that this implementation, does not implement this method but throw an exception (UnsupportedOperationException)

I am just trying the codes from Struts2 jQuery Plugin Showcase

any comment?

Quote:

---

Originally Posted by newbiejava

I am just trying the codes from Struts2 jQuery Plugin Showcase

any comment?

---

Can you show us the result of this:

Code:

---

System.out.println(session.getClass().getName());

---

... before your code throws an exception.

kind regards,

Jos

Hi All,

sorry, please ignore it .. but I am facing with this

Code:

---

Object list = session.get("mylist");
if (list == null) {
    myHost = HostDAO.buildList();
} else {
  myHost = (List<Host>) list;
}

---

why it still thrown java.lang.NullPointerException

please help

thanks & regards

Quote:

---

Originally Posted by newbiejava

Hi All,

sorry, please ignore it .. but I am facing with this

Code:

---

Object list = session.get("mylist");
if (list == null) {
    myHost = HostDAO.buildList();
} else {
  myHost = (List<Host>) list;
}

---

why it still thrown java.lang.NullPointerException

please help

thanks & regards

---

Please answer Jos's question so we all know what the issue was and please ask new questions in a new thread. In your new thread, please indicate which line throws the NPE, and which object on that line is null (easily tested by using System.out.println(myObject == null);


Thank you for your cooperation.

ok. sorry for this ..
FYI,
I am using NetBeans 6.9 and this is my 1st struts learning app.. and I don't know to get the value of System.out.println(session.getClass().getName());
I tried to use try.. catch .. but I still unable to get its value

try {

} catch (Exception ex) {
System.out.println(session.getClass().getName());
}

No, you simply place the line

Code:

---

System.out.println(session.getClass().getName());

---

on the line above the one that caused your error in your first post. Jos suspects (as I do) that the variable causing the error does not refer to a java.util.Map object.

Sorry, again ..:(
I knew the problem will not occurs if I removed "implements SessionAware" .. but I don't understandy why ?..

so I thought the problem is not from: Object list = session.get("mylist"); line as I said before.

could you please advise what's going on there?

Code:

---

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package example;

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

import com.opensymphony.xwork2.ActionSupport;
import java.sql.SQLException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Actions;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.interceptor.SessionAware;

/**
 *
 * @author luckay
 */
public class JQueryGrid extends ActionSupport implements SessionAware {

    private String message;
    private static final long serialVersionUID = 5078264277068533593L;
    private static final Log log = LogFactory.getLog(JQueryGrid.class);
    private List<Host> gridModel;
    private Integer rows = 0;
    private Integer page = 0;
    private Integer total = 0;
    private Integer record = 0;
    private String sord;
    private String sidx;
    private String searchField;
    private String searchString;
    private String searchOper;
    private boolean loadonce = false;
    private Map<String, Object> session;
    private List<Host> myHost;

    @Actions({
        @Action(value = "/JQueryGrid", results = {
            @Result(name = "success", type = "json")
        })
    })
    @Override
    public String execute() {
        try {
            setMessage("Hello Every body in Struts 2");
            System.out.println(session.getClass().getName());
            Object list = session.get("mylist");
            if (list != null) {
                myHost = (List<Host>) list;
            } else {
                myHost = HostDAO.buildList();
            }
            setRecord(HostDAO.getHostCount(myHost));

            int to = (getRows() * getPage());
            int from = to - getRows();

            if (to > getRecord()) {
                to = getRecord();
            }

            if (loadonce) {
                // All Custumer
                setGridModel(myHost);
            } else {
                // Search Custumers
                if (searchString != null && searchOper != null) {
                    int id = Integer.parseInt(searchString);
                    if (searchOper.equalsIgnoreCase("eq")) {
                        log.debug("search id equals " + id);
                        List<Host> cList = new ArrayList<Host>();
                        Host host = HostDAO.findById(myHost, id);
                        if (host != null) {
                            cList.add(host);
                        }
                        setGridModel(cList);
                    } else if (searchOper.equalsIgnoreCase("ne")) {
                        log.debug("search id not " + id);
                        setGridModel(HostDAO.findNotById(myHost, id, from, to));
                    } else if (searchOper.equalsIgnoreCase("lt")) {
                        log.debug("search id lesser then " + id);
                        setGridModel(HostDAO.findLesserAsId(myHost, id, from, to));
                    } else if (searchOper.equalsIgnoreCase("gt")) {
                        log.debug("search id greater then " + id);
                        setGridModel(HostDAO.findGreaterAsId(myHost, id, from, to));
                    }
                } else {
                    setGridModel(HostDAO.getHosts(myHost, from, to));
                }
            }
            setTotal((int) Math.ceil((double) getRecord() / (double) getRows()));
            //session.put("mylist", myHost);
        } catch (Exception ex) {
            System.out.println(session.getClass().getName());
        }
        return SUCCESS;
    }

    public String getJSON() throws SQLException {
        return execute();
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    /**
    * @return current page of the query
    */
    public Integer getPage() {
        return page;
    }

    /**
    * @param page
    *          current page of the query
    */
    public void setPage(Integer page) {
        this.page = page;
    }

    /**
    * @return total pages for the query
    */
    public Integer getTotal() {
        return total;
    }

    /**
    * @param total
    *          total pages for the query
    */
    public void setTotal(Integer total) {
        this.total = total;
    }

    /**
    * @return how many rows we want to have into the grid
    */
    public Integer getRows() {
        return rows;
    }

    /**
    * @param rows
    *          how many rows we want to have into the grid
    */
    public void setRows(Integer rows) {
        this.rows = rows;
    }

    /**
    * @return total number of records for the query. e.g. select count(*) from
    *        table
    */
    public Integer getRecord() {
        return record;
    }

    /**
    * @param record
    *          total number of records for the query. e.g. select count(*) from
    *          table
    */
    public void setRecord(Integer record) {

        this.record = record;

        if (this.record > 0 && this.rows > 0) {
            this.total = (int) Math.ceil((double) this.record / (double) this.rows);
        } else {
            this.total = 0;
        }
    }

    /**
    * @return an collection that contains the actual data
    */
    public List<Host> getGridModel() {
        return gridModel;
    }

    /**
    * @param gridModel
    *          an collection that contains the actual data
    */
    public void setGridModel(List<Host> gridModel) {
        this.gridModel = gridModel;
    }

    @Override
    public void setSession(Map<String, Object> map) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

---

Quote:

---

Originally Posted by newbiejava

Code:

---

public class JQueryGrid extends ActionSupport implements SessionAware {

    //....
    @Override
    public void setSession(Map<String, Object> map) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

---

---

Can you explain this? If you can't set your session, I don't see how it will ever be usable.

:confused:
sorry, I am unable to explain to you, I am still learning and got the codes from:

Struts2 jQuery Plugin Showcase

Cross-post: java-lang-UnsupportedOperationException-Not-supported

Please see the link in your post at JavaRanch.