从缓存中获取值时我遇到问题。
java.lang.RuntimeException: java.lang.ClassCastException: com.mycom.admin.domain.User cannot be cast to com.mycom.admin.domain.User
缓存配置
@Configuration
@EnableCaching
@AutoConfigureAfter(value = { MetricsConfiguration.class, DatabaseConfiguration.class })
@Profile("!" + Constants.SPRING_PROFILE_FAST)
public class MemcachedCacheConfiguration extends CachingConfigurerSupport {
private final Logger log = LoggerFactory.getLogger(MemcachedCacheConfiguration.class);
@Override
@Bean
public CacheManager cacheManager() {
ExtendedSSMCacheManager cacheManager = new ExtendedSSMCacheManager();
try {
List<SSMCache> list = new ArrayList<>();
list.add(new SSMCache(defaultCache("apiCache"), 86400, false));
cacheManager.setCaches(list);
} catch (Exception e) {
e.printStackTrace();
}
return cacheManager;
}
@Override
public CacheResolver cacheResolver() {
return null;
}
@Override
public CacheErrorHandler errorHandler() {
return null;
}
private Cache defaultCache(String cacheName) throws Exception {
CacheFactory cacheFactory = new CacheFactory();
cacheFactory.setCacheName(cacheName);
cacheFactory.setCacheClientFactory(new MemcacheClientFactoryImpl());
String serverHost = "127.0.0.1:11211";
cacheFactory.setAddressProvider(new DefaultAddressProvider(serverHost));
cacheFactory.setConfiguration(cacheConfiguration());
return cacheFactory.getObject();
}
@Bean
public CacheConfiguration cacheConfiguration() {
CacheConfiguration cacheConfiguration = new CacheConfiguration();
cacheConfiguration.setConsistentHashing(true);
return cacheConfiguration;
}
}
用
注释@Cacheable(value = "apiCache#86400", key = "'User-'.concat(#login)")
我正在使用com.google.code.simple-spring-memcached 3.5.0
值正在缓存但是在获取应用程序时会抛出类强制转换错误。什么是可能的问题。
答案 0 :(得分:8)
这是a known limitation of Devtools。反序列化高速缓存条目时,该对象不会附加到正确的类加载器。
有多种方法可以解决此问题:
simple
中的spring.cache.type
属性强制application-dev.properties
缓存管理器,并启用您的开发配置文件IDE)答案 1 :(得分:1)
嗯,我得到了同样的错误,但缓存不是原因。实际上我正在使用缓存,但是对缓存的评论并没有帮助。
根据这里和那里的提示,我刚刚介绍了我的对象的其他序列化/派生。它绝对是最好的方式(性能问题),但它正在发挥作用。
所以,只为其他人改变了我的代码:
@Cacheable("tests")
public MyDTO loadData(String testID) {
// add file extension to match XML file
return (MyDTO) this.xmlMarshaller.loadXML(String.format("%s/%s.xml", xmlPath, testID));
}
为:
@Cacheable("tests")
public MyDTO loadData(String testID) {
// add file extension to match XML file
Object dtoObject = this.xmlMarshaller.loadXML(String.format("%s/%s.xml", xmlPath, testID));
byte[] data = serializeDTO(dtoObject);
MyDTO dto = deserializeDTO(data);
return dto;
}
private MyDTO deserializeDTO(byte[] data) {
MyDTO dto = null;
try {
ByteArrayInputStream fileIn = new ByteArrayInputStream(data);
ObjectInputStream in = new ConfigurableObjectInputStream(fileIn,
Thread.currentThread().getContextClassLoader());
dto = (MyDTO) in.readObject();
in.close();
fileIn.close();
} catch (Exception e) {
String msg = "Deserialization of marshalled XML failed!";
LOG.error(msg, e);
throw new RuntimeException(msg, e);
}
return dto;
}
private byte[] serializeDTO(Object dtoObject) {
byte[] result = null;
try {
ByteArrayOutputStream data = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(data);
out.writeObject(dtoObject);
out.close();
result = data.toByteArray();
data.close();
} catch (IOException e) {
String msg = "Serialization of marshalled XML failed!";
LOG.error(msg, e);
throw new RuntimeException(msg, e);
}
return result;
}
注意:这不是任何软化的解决方案,而只是使用ConfigurableObjectInputStream类的提示。
答案 2 :(得分:0)