struts2 action
private List<GanttTask> ganttTaskList = null;
ganttTaskList = ganttTaskDao.gtList(task_id);
for(int i = 0;i<ganttTaskList.size();i++){
cname = ganttTaskList.get(i).getOther_field();
}
这句话有什么错？为什么总是报错
java.lang.ClassCastException: org.apache.commons.collections.map.ListOrderedMap cannot be cast to com.smic.mfg.bean.GanttTask
at com.smic.mfg.action.TaskListAction.query(TaskListAction.java:102)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
rg.apache.commons.collections.map.ListOrderedMap cannot be cast to com.smic.mfg.bean.GanttTask
List<GanttTask> ganttTaskList = ganttTaskDao.gtList(task_id); //看看这个方法返回的list和你定义的是否一致。
org.apache.commons.collections.map.ListOrderedMap cannot be cast to com.smic.mfg.bean.GanttTask
ListListOrderedMap不能转换为GanttTask
ganttTaskDao.gtList() 这个方法的返回类型应该是定义成了ListListOrderedMap
看错误应该是 ganttTaskDao.gtList() 这个方法定义的返回类型是错了，可能是import的时候搞错了。
dao
List<GanttTask> gtList(String task_id) throws Exception;
impl
@Override
public List<GanttTask> gtList(String task_id) throws Exception {
String sql = "select b.task_id,name,percent_done,to_char(a.start_date,'yyyy-mm-dd')start_date,to_char(a.end_date,'yyyy-mm-dd')end_date," +
"other_field,duration,pid,\"index\" from task a,JMP_TB_PROJECT b where a.pid=to_number(SUBSTR(b.TASK_ID,6,6)) and b.task_id=? ";
return jt.queryForList(sql,new Object[]{task_id});
}
bean
package com.smic.mfg.bean;
import java.io.UnsupportedEncodingException;
import java.util.Date;
public class GanttTask {
private Integer id;
private Date start_date;
private Date end_date;
private Integer percent_done;
private String name;
private Integer priority;
private String baseline_start_date;
private String baseline_end_date;
private Integer parent_id;
private Double duration;
private String duration_unit;
private String other_field;
private Integer pid;
private Integer index;
private String task_id;
public String getTask_id() {
return task_id;
}
public void setTask_id(String task_id) {
this.task_id = task_id;
}
public Date getStart_date() {
return start_date;
}
public void setStart_date(Date start_date) {
this.start_date = start_date;
}
public Date getEnd_date() {
return end_date;
}
public void setEnd_date(Date end_date) {
this.end_date = end_date;
}
public String getBaseline_start_date() {
return baseline_start_date;
}
public void setBaseline_start_date(String baseline_start_date) {
this.baseline_start_date = baseline_start_date;
}
public String getBaseline_end_date() {
return baseline_end_date;
}
public void setBaseline_end_date(String baseline_end_date) {
this.baseline_end_date = baseline_end_date;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getPercent_done() {
return percent_done;
}
public void setPercent_done(Integer percent_done) {
this.percent_done = percent_done;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getPriority() {
return priority;
}
public void setPriority(Integer priority) {
this.priority = priority;
}
public Integer getParent_id() {
return parent_id;
}
public void setParent_id(Integer parent_id) {
this.parent_id = parent_id;
}
public Double getDuration() {
return duration;
}
public void setDuration(Double duration) {
this.duration = duration;
}
public String getDuration_unit() {
return duration_unit;
}
public void setDuration_unit(String duration_unit) {
this.duration_unit = duration_unit;
}
public String getOther_field() throws UnsupportedEncodingException {
return other_field;
}
public void setOther_field(String other_field) {
this.other_field = other_field;
}
public Integer getPid() {
return pid;
}
public void setPid(Integer pid) {
this.pid = pid;
}
public Integer getIndex() {
return index;
}
public void setIndex(Integer index) {
this.index = index;
}
}
问题何在？