提问Spring中获取CacheManager Bean带来的类初始化错误

3901

在我使用springboot集成Ehcache时，出现java.lang.NoClassDefFoundError：Could not initialize class com.xxx.utils.EhcacheUtil错误，初步判定就是在我自己写的EhcacheUtil工具类中初始化CacheManager的static变量导致的错误。

EhcacheUtil类：

import com.travelsky.bluesky.bet.common.utils.SpringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;


public class EhcacheUtil {

	private static final Logger LOGGRE = LoggerFactory.getLogger(EhcacheUtil.class);
	private static final  CacheManager cacheManager = SpringUtils.getBean("cacheManager");
	
	private EhcacheUtil(){}

 // 省略工具方法
}

SpringUtils类：

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.util.Map;

/**
 * Spring ApplicationContext 工具类
*/
@SuppressWarnings("unchecked")
@Component
public class SpringUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext;
 
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringUtils.applicationContext = applicationContext;
    }
 
    public static <T> T getBean(String beanName) {
        if(applicationContext.containsBean(beanName)){
            return (T) applicationContext.getBean(beanName);
        }else{
            return null;
        }
    }
 
    public static <T> Map<String, T> getBeansOfType(Class<T> baseType){
        return applicationContext.getBeansOfType(baseType);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return applicationContext.getBean(clazz);
    }
}

这样当使用到EhcacheUtil这个类时就会报题目中的初始化类错误。

奇怪的是，当我用下面的SpringBeanUtils类替换SpringUtils类则不会报这个错，一切正常。

SpringBeanUtils类：

import java.util.HashMap;
import java.util.Map;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.stereotype.Service;

/**
 * Spring的工具类
 */
@Service
public class SpringBeanUtil implements BeanFactoryAware {

	private static final String KEY = "beanFactory";
	
	private static final Map<String,BeanFactory> beanFactoryMap = new HashMap<String, BeanFactory>(1);
	
	private BeanFactory beanFactory;
	/**
	 * 
	 * @param beanFactory 参数
	 * @throws BeansException 参数
	 */
	@Override
	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
		this.beanFactory = beanFactory;
		beanFactoryMap.put(KEY, this.beanFactory);
	}
	/**
	 * 
	 * @return  BeanFactory
	 */
	public BeanFactory getBeanFactory() {
		return beanFactory;
	}
	/**
	 * 
	 * @param name 参数
	 * @return 结果
	 */
	public static Object getBean(String name) {
		return beanFactoryMap.get(KEY).getBean(name);
	}
}

SpringBeanUtils类和SpringUtils类区别在于一个实现ApplicationContextAware接口，另一个实现BeanFactoryAware。

这是为什么呢？

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提问Spring中获取CacheManager Bean带来的类初始化错误

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