创建bean时出错：bean的实例化失败;嵌套异常是java.lang.ExceptionInInitializerError

时间：2014-05-11 22:45:34

标签： java spring

当我尝试使用应用程序上下文为圆类创建bean时，我遇到以下错误！ Circle类实现Shape接口，该接口包含方法draw()。

配置：

我正在学习spring并在eclipse中使用所有必需的jar（Spring和Apache commons logging）设置了Java Project。我在src文件夹的classpath中有spring.xml。还尝试下载最新的jar（Spring 4.0.4发布，以前使用4.0.0），但现在无法正常工作。想不出任何解决方法来解决这个问题。

错误：

May 11, 2014 6:20:50 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@90832e: startup date [Sun May 11 18:20:50 EDT 2014]; root of context hierarchy
May 11, 2014 6:20:50 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring.xml]
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor': Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1076)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1021)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:88)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:609)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.springApplication.DrawingApplication.main(DrawingApplication.java:16)
Caused by: java.lang.ExceptionInInitializerError
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1071)
    ... 13 more
Caused by: java.lang.NullPointerException
    at org.springframework.beans.PropertyEditorRegistrySupport.<clinit>(PropertyEditorRegistrySupport.java:92)
    ... 14 more

DrawingApplication.java 

package com.springApplication;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class DrawingApplication {

    public static void main(String[] args) {

        //The beanFactory reads from an XML file    
        //BeanFactory context = new XmlBeanFactory(new FileSystemResource("spring.xml"));

        //Application Context provides -- Event notification and more than Bean Factory
         ApplicationContext context =  new ClassPathXmlApplicationContext("spring.xml");

        //Here we pass the id of the bean from the XML given in the above line
         Shape shape =  (Shape)context.getBean("circle");

        //Calling the draw method through object local object created using Spring
         shape.draw();
    }

}

Circle.java 

package com.springApplication;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

public class Circle implements Shape{

    private Point center;

    public Point getCenter() {
        return center;
    }

    @Autowired
    @Qualifier("circleRelated")
    public void setCenter(Point center) {
        this.center = center;
    }

    @Override
    public void draw() {
        System.out.println("Drawing a Circle");
        System.out.println("Center Point is: (" + center.getX() + ", " + center.getY() + ")");      
    }
}

Point.java 

package com.springApplication;

public class Point {

    private int x;
    private int y;

    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
}

spring.xml 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<bean id="pointA" class="com.springApplication.Point">
    <qualifier value="circleRelated" />
    <property name="x" value="0"/>
    <property name="y" value="0"/>
</bean>

<bean id="PointB" class="com.springApplication.Point">
    <property name="x" value="0"/>
    <property name="y" value="20"/>
</bean>

<bean id="PointC" class="com.springApplication.Point">
    <property name="x" value="-20"/>
    <property name="y" value="0"/>
</bean>

<bean id="circle" class="com.springApplication.Circle">
</bean>

<!-- <bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" /> -->
<context:annotation-config/>
</beans>

如果需要其他任何内容，请告诉我。有人请帮忙！

抱歉错误的放置!!

@Andrei Stefan
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引用了所有这些以及其他默认系统库。

1 个答案:

答案 0 :(得分：4)

问题出现是因为

PropertyEditorRegistrySupport.class.getClassLoader()

是null。根据JavaDoc，如果类PropertyEditorRegistrySupport已由引导类加载器而不是系统类加载器加载，则会发生这种情况：

  

某些实现可能使用null来表示引导类加载器。 如果此类由引导程序类加载器加载，则此方法将在此类实现中返回null。

也许您的Spring库位于认可的类路径上？

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