org.hibernate.LazyInitializationException: could not initialize proxy - no Session

末蓝、 2024-02-17 13:43 12阅读 0赞

今天在写jbpm获取流程变量的时候出现了这个异常：org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    原因就是jbpm的底层采用了懒加载的方式，解决这个异常的方法就是在对象的映射文件中去掉默认的懒加载，例如：
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE hibernate-mapping PUBLIC 
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <hibernate-mapping>
    	<class name="cn.itcast.jbpm.processVariable.Form" table="itcast_form" lazy="false">
    		<id name="id" type="long">
    			<column name="id"></column>
    			<generator class="increment"></generator>
    		</id>
    		<property name="title" type="string">
    			<column name="title"></column>
    		</property>
    	</class>
    </hibernate-mapping>
    方法一：lazy默认是true，改成false就不会出现该异常了。

方法二：就是把这个类改成final类型的，这样它就不会产生代理对象了，如下：
    package cn.itcast.jbpm.processVariable;
    
    public final class Form {
    
    	private Long id;
    	private String title;
    	
    	public Form(){
    		
    	}
    
    	public Form(Long id, String title) {
    		this.id = id;
    		this.title = title;
    	}
    
    	public Long getId() {
    		return id;
    	}
    
    	public void setId(Long id) {
    		this.id = id;
    	}
    
    	public String getTitle() {
    		return title;
    	}
    
    	public void setTitle(String title) {
    		this.title = title;
    	}
    }