Android : Android update row int ormlite

I use ormlite in my Android project and I have problem with update data. Here is my function which save and update data.

public void saveDeadline(){
        if (getIntent().getExtras() == null){

            try {
                Deadline newDeadline = new Deadline(deadlineStr, fromStr, toStr);
                deadlineDao.create(newDeadline);
            }catch (SQLException e){
                e.printStackTrace();
            }

        } else {

            try {
                Deadline newDeadline = new Deadline(deadlineStr, fromStr, toStr);
                deadlineDao.update(newDeadline);
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

And here my Entity class:

@DatabaseTable(tableName = "deadline")

public class Deadline{

@DatabaseField(dataType = DataType.STRING)
private String deadlineName;

@DatabaseField(dataType = DataType.STRING)
private String deadlineStart;

@DatabaseField(dataType = DataType.STRING)
private String deadlineEnd;

public Deadline() {
    super();
}


public Deadline(String deadlineName, String deadlineStart, String deadlineEnd) {
    this.deadlineName = deadlineName;
    this.deadlineStart = deadlineStart;
    this.deadlineEnd = deadlineEnd;
}

public String getDeadlineName() {
    return deadlineName;
}

public void setDeadlineName(String deadlineName) {
    this.deadlineName = deadlineName;
}

public String getDeadlineStart() {
    return deadlineStart;
}

public void setDeadlineStart(String deadlineStart) {
    this.deadlineStart = deadlineStart;
}

public String getDeadlineEnd() {
    return deadlineEnd;
}

public void setDeadlineEnd(String deadlineEnd) {
    this.deadlineEnd = deadlineEnd;
}

}

My application can't update existing data? What am I doing wrong?