Well, I have implemented a distinct query in hibernate. It returns me result. But, while casting the fields are getting interchanged. So, it generates casting error. What should be the solution?
As an example, I do have database, "ProjectAssignment" that has three fields, aid, pid & userName. I want all distinct userName data from this table. I have applied query :
select distinct userName, aid, pid from ProjectAssignment
Whereas the ProjectAssignment.java file has the fields in sequence aid, pid & userName. Now, here the userName is first
field in output. So, Casting is not getting possible.
Also, query :
select aid, pid, distinct userName from ProjectAssignment
is not working.
What is the proper query for the same ? Or what else the solution ?
The code is as below :
System Utilization Service Bean Method where I have to retrieve data :
public List<ProjectAssignment> getProjectAssignments() {
projectAssignments = ProjectAssignmentHelper.getAllResources(); //Here comes the error
return projectAssignments;
}
ProjectAssignmentHelper from where I fetch Data :
package com.hibernate;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
public class ProjectAssignmentHelper {
public static List<ProjectAssignment> getAllResources() {
List<ProjectAssignment> projectMasters;
Session session = HibernateUtil.getSessionFactory().openSession();
Query query = session.createQuery("select distinct aid, pid, userName from ProjectAssignment");
projectMasters = (List<ProjectAssignment>) query.list();
session.close();
return projectMasters;
}
}
Hibernate Data Bean :
package com.hibernate;
public class ProjectAssignment implements java.io.Serializable {
private short aid;
private String pid;
private String userName;
public ProjectAssignment() {
}
public ProjectAssignment(short aid) {
this.aid = aid;
}
public ProjectAssignment(short aid, String pid, String userName) {
this.aid = aid;
this.pid = pid;
this.userName = userName;
}
public short getAid() {
return this.aid;
}
public void setAid(short aid) {
this.aid = aid;
}
public String getPid() {
return this.pid;
}
public void setPid(String pid) {
this.pid = pid;
}
public String getUserName() {
return this.userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
Error :
For
input string: "userName"
java.lang.NumberFormatException: For
input string: "userName"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:447)
at java.lang.Integer.parseInt(Integer.java:497)
at javax.el.ArrayELResolver.toInteger(ArrayELResolver.java:375)
at javax.el.ArrayELResolver.getValue(ArrayELResolver.java:195)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
at com.sun.el.parser.AstValue.getValue(AstValue.java:116)
at com.sun.el.parser.AstValue.getValue(AstValue.java:163)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:102)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178)
at javax.faces.component.UICommand.getValue(UICommand.java:218)
at org.primefaces.component.commandlink.CommandLinkRenderer.encodeMarkup(CommandLinkRenderer.java:113)
at org.primefaces.component.commandlink.CommandLinkRenderer.encodeEnd(CommandLinkRenderer.java:54)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:878)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:70)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:54)
at org.primefaces.component.datatable.DataTableRenderer.encodeTable(DataTableRenderer.java:525)
at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:407)
at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:193)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:878)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:70)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:54)
at org.primefaces.component.tabview.TabViewRenderer.encodeContents(TabViewRenderer.java:198)
at org.primefaces.component.tabview.TabViewRenderer.encodeMarkup(TabViewRenderer.java:130)
at org.primefaces.component.tabview.TabViewRenderer.encodeEnd(TabViewRenderer.java:48)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:878)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1620)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:380)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:802)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:664)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:497)
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:468)
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:364)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:314)
at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:783)
at org.apache.jsp.welcome_jsp._jspService(welcome_jsp.java from :59)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:406)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:483)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:373)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:619)
