[jboss-user] [EJB 3.0] - Display data via EJB 3
Hi there
I can create, insert and delete date via EJB 3, but I got a problem with displaying data.
I created an entitybean "UserCredentialsEntity.java", which defined all
setter/getter.
In interface "UserCredentialsHandler.java", I set a method
"public Collection getUser(String firstName);"
In Javabean "UserCredentialsBean.java", I implemented this method
"public Collection getUser(String firstName){
String oql = "select u from UserCredentialsEntity u where
u.firstName=:firstName";
return em.createQuery(oql).setParameter("firstName",
firstName).getResultList();
}"
Then I create a test.jsp to test this method: (code about displaying data)
<%@page import="javax.naming.*,
java.text.*,
java.util.*,
com.SurveyMaker.ejb.entity.*,
com.SurveyMaker.ejb.session.*"%>
<%!
private UserCredentialsHandler aUser = null;
public void jspInit () {
try {
InitialContext ctx = new InitialContext();
aUser = (UserCredentialsHandler)
ctx.lookup("surveymaker/UserCredentialsBean/local");
} catch (Exception e) {
e.printStackTrace ();
}
}%>
<%
Collection somePeople= aUser.getUser("Allen");
for(Iterator iter = somePeople.iterator(); iter.hasNext();){
UserCredentialsEntity user = (UserCredentialsEntity)iter.next();
%>
Username: <%=user.getFirstName() %>
<%
}
%>
It brings me an error:
org.apache.jasper.JasperException: Exception in JSP: /test.jsp:29
26: <%
27: Collection somePeople= aUser.getUser("Allen");
28: for(Iterator iter = somePeople.iterator(); iter.hasNext();){
29: UserCredentialsEntity user = (UserCredentialsEntity)iter.next();
30: %>
31: Username: <%=user.getFirstName() %>
32: <%
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
root cause
java.lang.ClassCastException: com.SurveyMaker.ejb.entity.UserCredentialsEntity
org.apache.jsp.test_jsp._jspService(test_jsp.java:71)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
Can anyone help me, please?
Cheers
Ming
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