java.lang.NoClassDefFoundError：我的项目中的文件

Question

当我启动tomcat时，我收到以下错误：

   Caused by: java.lang.NoClassDefFoundError: Core/Interfaces/ILogger
        at java.lang.Class.getDeclaredFields0(Native Method)
        at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
        at java.lang.Class.getDeclaredFields(Class.java:1916)
        at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
        at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:262)
        at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:136)
        at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66)
        at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:778)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5105)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

这里ILogger.java是我项目中的一个文件。我的构建路径可能出错？是什么开始检查问题？

按要求添加ILogger.java。     包Core.Interfaces;

public interface ILogger {
    void Information(String info);

    void Warning(String msg);
    void Warning(String warning, String methodName);
    void Warning(String warning, String methodName, RuntimeException ex);

    void Error(String info);
    void Error(String error, String message, RuntimeException ex);
    void Error(String p, String p_2);
    void ErrorException(RuntimeException ex);
    void ErrorException(Exception ex);

    void ForceInformation(String info);
    void ForceInformation(String info, String method);

    void ForceWarning(String msg);
    void ForceWarning(String msg, String method);
    void ForceWarning(String warning, String methodName, RuntimeException ex);
    //void ForceWarning(String warning, String methodName, RuntimeException ex, StackTrace stackTrace);

    void Information(String information, String methodName);
    void Information(String information, int inEventID, short inCategory);

    void FileName(String fileName, String key);
}