在javascript中访问java对象

我正在使用spring框架。我将java bean对象作为模型属性传递给JSP。在JSP上，我调用了一个传递这个java bean对象的javascript函数。我需要在javascript内部访问这个对象的成员。下面是代码片段在javascript中访问java对象

Test.jsp 
.. 
.. 
<form:radiobutton id="showdialog" path="nextAction" value="showdialog" label="show dialog" 
    onclick="javascript: showDiseaseGroupDialog('${dataRequestFormDTO}');"/></span></div> 
.. 
.. 

Common.js 
function showDiseaseGroupDialog(dataRequestFormDTO){ 

    alert("DG:"+dataRequestFormDTO.selectedDiseaseGroup); 
    for(var diseaseGroupDTO in dataRequestFormDTO.availableDiseaseGroups.values){ 
     alert(diseaseGroupDTO.name); 
    } 
} 

DataRequestFormDTO.java 
public class DataRequestFormDTO{ 
    private String selectedDiseaseGroup; 
    private Map<String, DiseaseGroupDTO> availableDiseaseGroups; 

    public String getSelectedDiseaseGroup() { 
     return selectedDiseaseGroups; 
    } 

    public void setSelectedDiseaseGroup(String selectedDiseaseGroup) { 
     this.selectedDiseaseGroup = selectedDiseaseGroup; 
    } 

    public Map<String, DiseaseGroupDTO> getAvailableDiseaseGroups() { 
     return availableDiseaseGroups; 
    } 

    public void setAvailableDiseaseGroups(
      Map<String, DiseaseGroupDTO> availableDiseaseGroups) { 
     this.availableDiseaseGroups = availableDiseaseGroups; 
    } 
} 

public class DiseaseGroupDTO { 

    private String id; 
    private String name; 

    public String getId() { 
     return id; 
    } 
    public void setId(String id) { 
     this.id = id; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 

}

问题是我在showDiseaseGroupDialog函数中出错。第一个提示显示“DG：未定义”，javascript错误“availableDiseaseGroups未定义”。

我想了解