自動裝配Autowired春豆定製SLF4J的appender

使用AspectJ我已經注射服務爲一體的非管理域對象：這是服務：自動裝配Autowired春豆定製SLF4J的appender

@Service 
public class DomainServiceImpl implements DomainService { 
    public String getLoggerMessage(String prevMessage) { 
      return String.format("Message from logger service:%s", prevMessage); 
    } 
}

這是域對象：

@Configurable(dependencyCheck = true) 
public class DomainObject { 
    private IAppenderService appenderService; 
    @Autowired 
    public void setAppenderService(IAppenderService appenderService) { 
     this.appenderService = appenderService; 
    } 
    public IAppenderService getAppenderService() { 
     return appenderService; 
    } 

    public String formMessage(String message){  
     return appenderService.getLoggerMessage(message); 
    } 
}

以下測試成功：

@Test 
    public void testAppender(){ 
     DomainObject domainObject = new DomainObject(); 
     assertNotNull(domainObject.getAppenderService()); 
    }

如果我加

System.out.println(new DomainObject().formMessage("test message"));

任何控制器我有預計在控制檯字符串：「從記錄器服務的消息：測試消息」

然後我嘗試使用這項服務到自定義SLF4J附加器：

@Configurable(dependencyCheck = true) 
public class MyAppender extends AppenderSkeleton { 
    IAppenderService appenderService;   
    @Autowired 
    public void setAppenderService(IAppenderService appenderService) { 
     this.appenderService = appenderService; 
    } 
    public IAppenderService getAppenderService() { 
     return appenderService; 
    } 
    @Override 
    public void close() { 
    } 
    @Override 
    public boolean requiresLayout() {  
     return false; 
    } 
    @Override 
    protected void append(LoggingEvent event) {  
     System.out.println(new DomainObject().formMessage(event.getMessage().toString())); 
    } 
}

但得NPE：

java.lang.NullPointerException 
    at sbk.spring.testaopjc.domain.DomainObject.formMessage(DomainObject.java:19) 
    at sbk.spring.testaopjc.appender.MyAppender.append(MyAppender.java:29) 
    at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)

在同一時間下面的測試是成功的：

public void testAppendeSecond(){ 
     MyAppender appender = new MyAppender(); 
     assertNotNull(appender.getAppenderService()); 
    }

任何人都可以解釋爲什麼MyAppender在這種情況下行爲不同嗎？ PS：我的log4j.properties文件：

log4j.rootLogger=INFO, STDOUT 

log4j.appender.STDOUT=sbk.spring.testaopjc.appender.MyAppender 
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout 
log4j.appender.STDOUT.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%M:%L - %m%n

來源

2014-04-07 Sobik

貌似是創造了這個附加器彈簧加載的類之前，從而讓你的例外。 –

提供任何建議？ – Sobik