could not initialize proxy - no Session

实体类FileManager:
package com.dynastarter.sc.file.po;

import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

/**

• Filemanager entity.

• @author MyEclipse Persistence Tools
  */
  @Entity
  @Table(name = "filemanager")
  public class FileManager implements java.io.Serializable {
  private Long id;
  private String filename;
  private Integer fileSize;
  private String fileContentType;
  private Long site;
  private Date uploadTime;
  private Integer parentDirectory;
  private Byte isDirectory;
  private Byte isFile;

  // Constructors

  /** default constructor */
  public FileManager() {
  }

  // Property accessors
  @Id
  @GeneratedValue(strategy=GenerationType.AUTO)
  public Long getId() {
  return this.id;
  }

  public void setId(Long id) {
  this.id = id;
  }

  @Column(name = "filename")
  public String getFilename() {
  return this.filename;
  }

  public void setFilename(String filename) {
  this.filename = filename;
  }

  @Column(name = "fileSize")
  public Integer getFileSize() {
  return this.fileSize;
  }

  public void setFileSize(Integer fileSize) {
  this.fileSize = fileSize;
  }

  @Column(name = "fileContentType")
  public String getFileContentType() {
  return this.fileContentType;
  }

  public void setFileContentType(String fileContentType) {
  this.fileContentType = fileContentType;
  }

  @Column(name = "site")
  public Long getSite() {
  return this.site;
  }

  public void setSite(Long site) {
  this.site = site;
  }

  @Temporal(TemporalType.DATE)
  @Column(name = "uploadTime")
  public Date getUploadTime() {
  return this.uploadTime;
  }

  public void setUploadTime(Date uploadTime) {
  this.uploadTime = uploadTime;
  }

  @Column(name = "parentDirectory")
  public Integer getParentDirectory() {
  return this.parentDirectory;
  }

  public void setParentDirectory(Integer parentDirectory) {
  this.parentDirectory = parentDirectory;
  }

  @Column(name = "isDirectory")
  public Byte getIsDirectory() {
  return this.isDirectory;
  }

  public void setIsDirectory(Byte isDirectory) {
  this.isDirectory = isDirectory;
  }

  @Column(name = "isFile")
  public Byte getIsFile() {
  return this.isFile;
  }

  public void setIsFile(Byte isFile) {
  this.isFile = isFile;
  }
  }
  -----但是根据id获得对象是就报错
  dao:
  @Repository
  public class FileManagerDAO extends HibernateDao {

  /**

  • 根据目录id找到该目录下的文件
  • @param id目录id值
  • @return */ public List getFileManagerByParentId(int id){ List list=this.getSession().createQuery(" from FileManager where parentDirectory="+id+" ").list(); return list; }

}

service:
@Service
@Transactional
public class FileManagerService {
@Autowired
private FileManagerDAO fileManagerDAO;

public FileManager getRootFileManager(){
    return fileManagerDAO.get(new Long(1));
}


public FileManager getFileManager(Long id){
    return fileManagerDAO.get(id);
}

@Transactional
public void deleteFileManager(Long id){
     fileManagerDAO.delete(id);
}

public List<FileManager> getFileManagerByParentId(int parentId){
    return fileManagerDAO.getFileManagerByParentId(parentId);
}

}

action中调用:

public String loadDocument() throws Exception{
StringBuilder sb=new StringBuilder("[");
String root=getRequest().getParameter("root");
if(root!=null&&"true".equals(root)){
FileManager fileManager= fileManagerService.getRootFileManager();
System.out.println(fileManager.getId());
sb.append("{");
sb.append("'id':").append(""+fileManager.getId()+",");
sb.append("'fileName':").append("'"+fileManager.getFilename()+"',");
sb.append("'fileSize':").append(fileManager.getFileSize()+",");
sb.append("'fileContentType':").append("'"+fileManager.getFileContentType()+"',");
// sb.append("'uploadUser':").append("'"+fileManager.getUploadUser().getPersonName()+"',");
sb.append("'uploadTime':").append("'"+fileManager.getUploadTime()+"',");
sb.append("'isDirectory':").append("'"+fileManager.getIsDirectory()+"',");
sb.append("'isFile':").append("'"+fileManager.getIsFile()+"',");
sb.append("'childFiles':");
sb.append("''");
sb.append("}");
/* sb.append("{");
sb.append("'id':").append("1,");
sb.append("'fileName':").append("'呵呵',");
sb.append("'parentDirectory':").append("-1");
sb.append("}");*/
}
else{

List list=fileManagerService.getFileManagerByParentId(id);
for(FileManager fileManager1:list){
sb.append("{");
sb.append("'id':").append(""+fileManager1.getId()+",");
sb.append("'fileName':").append("'"+fileManager1.getFilename()+"',");
sb.append("'fileSize':").append(fileManager1.getFileSize()+",");
sb.append("'fileContentType':").append("'"+fileManager1.getFileContentType()+"',");
// sb.append("'uploadUser':").append("'"+fileManager1.getUploadUser().getPersonName()+"',");
sb.append("'uploadTime':").append("'"+fileManager1.getUploadTime()+"',");
sb.append("'isDirectory':").append("'"+fileManager1.getIsDirectory()+"',");
sb.append("'isFile':").append("'"+fileManager1.getIsFile()+"',");
sb.append("},");
}
}
if(sb.lastIndexOf(",")>0){
sb=new StringBuilder(sb.substring(0,sb.lastIndexOf(",")));
}
sb.append("]");
System.out.println(sb.toString());
getResponse().setContentType("text/html;charset=UTF-8");
getResponse().getWriter().write(sb.toString());
return null;
}

关于这个问题，首先要肯定的是在你的action中session已关闭。
那么你所要做的是进行调试。
找出在openSessionInViewFilter中是否正确步入，
或者session是在那里被人为关闭了。

如果你觉得麻烦而不愿意调试的话，我还有一个办法，使是强制加载。
在session尚未关闭的时候使用Hibernate.initialize(a)。那么就会将a强制为游离态时也可以使用的实体。

如上面改为:
public List getFileManagerByParentId(int id){
[code="java"]List list=this.getSession().createQuery(" from FileManager where parentDirectory="+id+" ").list();

for(list){
Hibernate.initialize(list.i);
}

return list;
} [/code]

将上面的伪码换为java语句就应该可以了

提问的时候最后把错误信息 也贴一下！ :arrow:

web。xml 配置这个了没？

openSessionInViewFilter

org.springframework.orm.hibernate3.support.OpenSessionInViewFilter



openSessionInViewFilter
.do


openSessionInViewFilter
.jsp

[quote]public class FileManagerDAO extends HibernateDao { [/quote]

HibernateDao 这个里面是否有 session 或者sessionfactory 的注入呢？检查下！

不是很复杂的话 给我发过来！我帮你看看！ （项目 复杂就...我也没太多时间！

[code="java"]System.out.println(fileManager.getId());
sb.append("{");
sb.append("'id':").append(""+fileManager.getId()+",");
sb.append("'fileName':").append("'"+fileManager.getFilename()+"',");
sb.append("'fileSize':").append(fileManager.getFileSize()+",");
sb.append("'fileContentType':").append("'"+fileManager.getFileContentType()+"',");
// sb.append("'uploadUser':").append("'"+fileManager.getUploadUser().getPersonName()+"',");
sb.append("'uploadTime':").append("'"+fileManager.getUploadTime()+"',");
sb.append("'isDirectory':").append("'"+fileManager.getIsDirectory()+"',");
sb.append("'isFile':").append("'"+fileManager.getIsFile()+"',");
sb.append("'childFiles':");
sb.append("''");
sb.append("}");
/* sb.append("{");
sb.append("'id':").append("1,");
sb.append("'fileName':").append("'呵呵',");
sb.append("'parentDirectory':").append("-1");
sb.append("}");*/ [/code]

将字符串中的内容放到一个jsp页面中，再然后用action跳过去试试。

或者试试将web.xml改为：
[code="xml"]
openSessionInViewFilter

org.springframework.orm.hibernate3.support.OpenSessionInViewFilter



openSessionInViewFilter
/*
[/code]