简单的spring java配置错误

Question

我正在关注Spring的教程点，我正在尝试基于Java的配置示例。我有与教程相同的代码，但我不明白为什么标记NullPointerException。

这是我的模特

package com.tutorialspoint3.javaConfig;

public class HelloWorld {

    private String message;

    public void setMessage(String message) {
        this.message = message;
    }

    public void getMessage() {

        System.out.println("Your message: " + message);
    }

}

我的配置类

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

//Configuration class

@Configuration
public class HelloWorldConfig {

    @Bean
    public HelloWorld helloWorld(){

        return new HelloWorld();
    }

}

和我的主要

package com.tutorialspoint3.javaConfig;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class MainApp3 {

    public static void main(String[] args) {

        ApplicationContext ctx =
                new AnnotationConfigApplicationContext(HelloWorldConfig.class);

        HelloWorld helloWorld = ctx.getBean(HelloWorld.class);
        helloWorld.setMessage("Hello World!");
        helloWorld.getMessage();
    }

}

这是堆栈错误：

Exception in thread "main" java.lang.NullPointerException
    at org.springframework.core.SerializableTypeWrapper$TypeProxyInvocationHandler.invoke(SerializableTypeWrapper.java:239)
    at org.springframework.core.$Proxy0.hashCode(Unknown Source)
    at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:273)
    at org.springframework.core.ResolvableType.hashCode(ResolvableType.java:811)
    at org.springframework.util.ConcurrentReferenceHashMap.getHash(ConcurrentReferenceHashMap.java:214)
    at org.springframework.util.ConcurrentReferenceHashMap.getReference(ConcurrentReferenceHashMap.java:246)
    at org.springframework.util.ConcurrentReferenceHashMap.get(ConcurrentReferenceHashMap.java:226)
    at org.springframework.core.ResolvableType.forType(ResolvableType.java:1207)
    at org.springframework.core.ResolvableType.forType(ResolvableType.java:1177)
    at org.springframework.core.ResolvableType.forTypes(ResolvableType.java:856)
    at org.springframework.core.ResolvableType.getInterfaces(ResolvableType.java:403)
    at org.springframework.core.ResolvableType.as(ResolvableType.java:365)
    at org.springframework.core.convert.support.GenericConversionService.getRequiredTypeInfo(GenericConversionService.java:286)
    at org.springframework.core.convert.support.GenericConversionService.addConverterFactory(GenericConversionService.java:118)
    at org.springframework.core.convert.support.DefaultConversionService.addScalarConverters(DefaultConversionService.java:86)
    at org.springframework.core.convert.support.DefaultConversionService.addDefaultConverters(DefaultConversionService.java:67)
    at org.springframework.core.convert.support.DefaultConversionService.<init>(DefaultConversionService.java:54)
    at org.springframework.core.env.AbstractPropertyResolver.<init>(AbstractPropertyResolver.java:41)
    at org.springframework.core.env.PropertySourcesPropertyResolver.<init>(PropertySourcesPropertyResolver.java:41)
    at org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:112)
    at org.springframework.core.env.StandardEnvironment.<init>(StandardEnvironment.java:54)
    at org.springframework.context.annotation.AnnotatedBeanDefinitionReader.getOrCreateEnvironment(AnnotatedBeanDefinitionReader.java:177)
    at org.springframework.context.annotation.AnnotatedBeanDefinitionReader.<init>(AnnotatedBeanDefinitionReader.java:66)
    at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:61)
    at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:82)
    at com.tutorialspoint3.javaConfig.MainApp3.main(MainApp3.java:11)

我缺少什么？我在jre 1.7下运行，Spring版本是4.1.4。如果我在jdk 1.8下运行，我收到了错误

  

java.lang.NoSuchMethodError：   org.springframework.util.ClassUtils.getMethod（Ljava /郎/类; Ljava /郎/字符串; [Ljava /郎/类;）Ljava /郎/反映/方法;