当我尝试使用 Application Context 为 circle 类创建 bean 时，我遇到了以下错误! Circle 类实现了 Shape 接口(interface)，其中包含一个方法 draw()。
配置:
我正在学习 spring，并在 eclipse 中设置了一个 Java 项目，其中包含所有必需的 jar(Spring 和 Apache commons 日志记录)。我在 src 文件夹的类路径中有 spring.xml。还尝试下载最新的 jars(Spring 4.0.4 版本，之前使用 4.0.0)但现在不起作用。想不出任何解决方案来解决这个问题。
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() + ")");
}
}
点.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>
如果还有其他需要，请告诉我。有人请帮忙!
抱歉放错了!!
@安德烈斯特凡
jar list ----------
commons-logging-1.1.3
spring-aop-4.0.4.RELEASE
spring-aop-4.0.4.RELEASE-javadoc
spring-aop-4.0.4.RELEASE-sources
spring-aspects-4.0.4.RELEASE
spring-aspects-4.0.4.RELEASE-javadoc
spring-aspects-4.0.4.RELEASE-sources
spring-beans-4.0.4.RELEASE
spring-beans-4.0.4.RELEASE-javadoc
spring-beans-4.0.4.RELEASE-sources
spring-build-src-4.0.4.RELEASE
spring-context-4.0.4.RELEASE
spring-context-4.0.4.RELEASE-javadoc
spring-context-4.0.4.RELEASE-sources
spring-context-support-4.0.4.RELEASE
spring-context-support-4.0.4.RELEASE-javadoc
spring-context-support-4.0.4.RELEASE-sources
spring-core-4.0.4.RELEASE
spring-core-4.0.4.RELEASE-javadoc
spring-core-4.0.4.RELEASE-sources
spring-expression-4.0.4.RELEASE
spring-expression-4.0.4.RELEASE-javadoc
spring-expression-4.0.4.RELEASE-sources
spring-framework-bom-4.0.4.RELEASE
spring-framework-bom-4.0.4.RELEASE-javadoc
spring-framework-bom-4.0.4.RELEASE-sources
spring-instrument-4.0.4.RELEASE
spring-instrument-4.0.4.RELEASE-javadoc
spring-instrument-4.0.4.RELEASE-sources
spring-instrument-tomcat-4.0.4.RELEASE
spring-instrument-tomcat-4.0.4.RELEASE-javadoc
spring-instrument-tomcat-4.0.4.RELEASE-sources
spring-jdbc-4.0.4.RELEASE
spring-jdbc-4.0.4.RELEASE-javadoc
spring-jdbc-4.0.4.RELEASE-sources
spring-jms-4.0.4.RELEASE
spring-jms-4.0.4.RELEASE-javadoc
spring-jms-4.0.4.RELEASE-sources
spring-messaging-4.0.4.RELEASE
spring-messaging-4.0.4.RELEASE-javadoc
spring-messaging-4.0.4.RELEASE-sources
spring-orm-4.0.4.RELEASE
spring-orm-4.0.4.RELEASE-javadoc
spring-orm-4.0.4.RELEASE-sources
spring-oxm-4.0.4.RELEASE
spring-oxm-4.0.4.RELEASE-javadoc
spring-oxm-4.0.4.RELEASE-sources
spring-test-4.0.4.RELEASE
spring-test-4.0.4.RELEASE-javadoc
spring-test-4.0.4.RELEASE-sources
spring-tx-4.0.4.RELEASE
spring-tx-4.0.4.RELEASE-javadoc
spring-tx-4.0.4.RELEASE-sources
spring-web-4.0.4.RELEASE
spring-web-4.0.4.RELEASE-javadoc
spring-web-4.0.4.RELEASE-sources
spring-webmvc-4.0.4.RELEASE
spring-webmvc-4.0.4.RELEASE-javadoc
spring-webmvc-4.0.4.RELEASE-sources
spring-webmvc-portlet-4.0.4.RELEASE
spring-webmvc-portlet-4.0.4.RELEASE-javadoc
spring-webmvc-portlet-4.0.4.RELEASE-sources
spring-websocket-4.0.4.RELEASE
spring-websocket-4.0.4.RELEASE-javadoc
spring-websocket-4.0.4.RELEASE-sources
所有这些以及其他默认系统库都被引用。
最佳答案
出现问题是因为
PropertyEditorRegistrySupport.class.getClassLoader()
是 null。根据 JavaDoc，如果类 PropertyEditorRegistrySupport 已被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:
Some implementations may use null to represent the bootstrap class loader. This method will return null in such implementations if this class was loaded by the bootstrap class loader.
也许您的 Spring 库在认可的类路径上？
关于java - 创建 bean 时出错 : Instantiation of bean failed; nested exception is java. lang.ExceptionInInitializerError，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23598748/