Setting a jstl bean varable?

i have a java bean like this:
 <jsp:useBean id="empskill" class="com.Database.EmployeeSkill" scope="page">
 <jsp:setProperty name="empskill" property="ename" value="<%= session.getAttribute( "ename" ) %>"/>
 <jsp:setProperty name="empskill" property="skill.skillname" value="<%= session.getAttribute( "sname" ) %>"/>
 <jsp:setProperty name="empskill" property="yearsexperience" value="<%= session.getAttribute( "yexp" ) %>"/>
 </jsp:useBean>and i have java set method in employeeskill :
 public void setSkill(Skill skill) {this.skill = skill; }and i have a java set method in skill :
 public void setSkillname(String skillname) { this.skillname = skillname; }why is it that i cant set the parameter like this, i get this error:
org.apache.jasper.JasperException: An exception occurred processing JSP page /main.jsp at line 277
274:
275: <jsp:useBean id="empskill" class="com.Database.EmployeeSkill" scope="page">
276: <jsp:setProperty name="empskill" property="ename" value="<%= session.getAttribute( "ename" ) %>"/>
277: <jsp:setProperty name="empskill" property="skill.skillname" value="<%= session.getAttribute( "sname" ) %>"/>
278: <jsp:setProperty name="empskill" property="yearsexperience" value="<%= session.getAttribute( "yexp" ) %>"/>
279: </jsp:useBean>
280:
 org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:555)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:414)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Cannot find any information on property 'skill.skillname' in a bean of type 'com.Database.EmployeeSkill'
 org.apache.jasper.runtime.JspRuntimeLibrary.handleSetProperty(JspRuntimeLibrary.java:666)
 org.apache.jsp.main_jsp._jspService(main_jsp.java:353)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:390)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
org.apache.jasper.JasperException: Cannot find any information on property 'skill.skillname' in a bean of type 'com.Database.EmployeeSkill'
 org.apache.jasper.runtime.JspRuntimeLibrary.getWriteMethod(JspRuntimeLibrary.java:794)
 org.apache.jasper.runtime.JspRuntimeLibrary.handleSetProperty(JspRuntimeLibrary.java:663)
 org.apache.jsp.main_jsp._jspService(main_jsp.java:353)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:390)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

This is a tough looking design. Here is what I would ask myself, if I were you:
Is EmployeeSkill A Skill, or does EmployeeSkill Have A Skill?
Your design says: EmployeeSkill Has A Skill, but it seems to me that EmployeeSkill Is A Skill.
So instead of having EmployeeSkill contain an object of type Skill, maybe EmployeeSkill should extend Skill:
class Skill {
    private ResultSet rs ;//the result set to hold the data from the database
    private Connection con;//holds the connection to the database
    private Statement stmt;//used to run SQL
    private int skillid;
    private String skillname, description;
    SkillType skilltype = new SkillType();
    public void setSkillid(int skillid) { this.skillid = skillid; }
    public void setSkillname(String skillname) { this.skillname = skillname; }
    public void setDescription(String description) { this.description = description; }
    public void setSkilltype(SkillType skilltype) { this.skilltype = skilltype; }
    public int getSkillid() { return this.skillid; }
    public String getSkillname() { return this.skillname; }
    public String getSkillDescription() { return this.description; }
    public SkillType getSkilltype() { return this.skilltype; }
} //end Skill class
public class EmployeeSkill extends Skill {
    private ResultSet rs ;//the result set to hold the data from the database
    private Connection con;//holds the connection to the database
    private Statement stmt;//used to run SQL
    private String skilllevel;
    private double yearsexperience = 0;
    Employee employee = new Employee();
    public void setSkilllevel(String level) { this.skilllevel = level; }
    public void setYearsexperience(double yearsexp) { this.yearsexperience = yearsexp; }
    public void setEmpid(int empid) {this.employee.setEmpid(empid); }
    public void setEname(String ename) { this.employee.setEname(ename); }
    public int getEmpid() { return this.employee.getEmpid(); }
    public String getEname() { return this.employee.getEname(); }
    public String getSkilllevel() { return this.skilllevel; }
    public double getYearsexperience() { return this.yearsexperience; }
} //end EmployeeSkill classIn that case, because EmployeeSkill is a Skill, it has all the methods of the parent Skill type.
Choosing between inheritance (EmployeeSkill Is A Skill) and composition (EmployeeSkill Has A Skill) can be tricky sometimes. Only use the inheritance scheme if it actually fits (it does appear to fit to me), and only if the Skill referenced by EmployeeSkill doesn't change in relationship to the EmployeeSkill (for example, if the Skill's SkillType can change indepependently, or if, over the course of your application, the EmployeeSkill may point to several different Skills, while maintaining its own identity).
An Composition alternative to the above code would have delegate methods in the EmployeeSkill class to pass information to the Skill, and get it back:
public class EmployeeSkill {
    private ResultSet rs ;//the result set to hold the data from the database
    private Connection con;//holds the connection to the database
    private Statement stmt;//used to run SQL
    private String skilllevel;
    private double yearsexperience = 0;
    Employee employee = new Employee();
    Skill skill = new Skill();
    public void setSkilllevel(String level) { this.skilllevel = level; }
    public void setYearsexperience(double yearsexp) { this.yearsexperience = yearsexp; }
    public void setEmpid(int empid) {this.employee.setEmpid(empid); }
    public void setEname(String ename) { this.employee.setEname(ename); }
    public void setSkillid(int skillid) { this.skill.setSkillid(skillid); }
    public void setSkillname(String skillname) { this.skill.setSkillname(skillname); }
    public void setDesctiption(String description) { this.skill.setDescription(description); }
    public void setSkilltype(SkillType skilltype) { this.skill.setSkilltype(skilltype); }
    public int getSkillid() { return this.skill.getSkillid(); }
    public String getSkillname() { return this.skill.getSkillname(); }
    public String getDescription() { return this.skill.getSkillDescription(); }
    public SkillType getSkilltype() { return this.skill.getSkilltype(); }
    public int getEmpid() { return this.employee.getEmpid(); }
    public String getEname() { return this.employee.getEname(); }
    public String getSkilllevel() { return this.skilllevel; }
    public double getYearsexperience() { return this.yearsexperience; }
} //end EmployeeSkill classIt looks worse because it has more methods, but it can be the better design in the long run.
I would also question the design that says 'EmployeeSkill Has An Employee'. It seems to me that the opposite should be true, the 'Employee Has An EmployeeSkill', or a bunch of them. So it might be worth thinking about how to better manage that relationship.

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