톰캣의 클래스 로딩 순서

    Bootstrap classes of your JVM
    System class loader classses (described above)
    /WEB-INF/classes of your web application
    /WEB-INF/lib/*.jar of your web application
    $CATALINA_HOME/common/classes
    $CATALINA_HOME/common/endorsed/*.jar
    $CATALINA_HOME/common/i18n/*.jar
    $CATALINA_HOME/common/lib/*.jar
    $CATALINA_BASE/shared/classes
    $CATALINA_BASE/shared/lib/*.jar