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为什么80%的码农都做不了架构师？>>>   

1.发生场景

    实体对象有对自身的映射。如

package com.amith.office.domain;import java.util.HashSet;
import java.util.Set;import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;import com.amith.query.QueryObject;/*** 文件名:ProcessCategory.java * 描述:流程分类 * 创建时间:2013-7-24 下午8:55:46 * 创建者:mluo * 版本号:v1.0*/
@Entity
@Table(name = "process_categorys")
public class ProcessCategory extends OfficeAggregateRootEntity {private static final long serialVersionUID = 1L;private String name;private ProcessCategory parent;private Set<ProcessCategory> children = new HashSet<ProcessCategory>();public ProcessCategory(String name) {this.name = name;}public ProcessCategory() {}public void createChild(ProcessCategory child) {child.setParent(this);children.add(child);this.update();}public static ProcessCategory getRoot() {return getRepository().getSingleResult(QueryObject.create(ProcessCategory.class).isNull("parent"));}public String getName() {return name;}public void setName(String name) {this.name = name;}@ManyToOne@JoinColumn(name = "parent_id")public ProcessCategory getParent() {return parent;}public void setParent(ProcessCategory parent) {this.parent = parent;}@OneToMany(cascade = CascadeType.ALL)@JoinTable(name = "process_category_middles", joinColumns = @JoinColumn(name = "parent_id"), inverseJoinColumns = @JoinColumn(name = "child_id"))public Set<ProcessCategory> getChildren() {return children;}public void setChildren(Set<ProcessCategory> children) {this.children = children;}}

2. 解决办法

    2.1、在相应的映射文件里禁止该类的延迟加载：设置lazy=false

    2.2、在session关闭之前取出需要的属性（@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)）

    2.3、使用openSessionInView

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