eclipse中的專案用配置的Tomact啟動。但是出現問題，如下：

Caused by: java.lang.IllegalStateException: Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher

應該是我在專案中用了jdk1.8的版本，但是JdkVersion只檢查到了1.7，jre1.8時不匹配任何jdk。所以 你可以改一下jdk的版本或用下面的方法：

public abstract class JdkVersion {
    public static final int JAVA_13 = 0;
    public static final int JAVA_14 = 1;
    public static final int JAVA_15 = 2;
    public static final int JAVA_16 = 3;
    public static final int JAVA_17 = 4;
    //for jre 1.8
    public static final int JAVA_18 = 5;
    private
 
 static final String javaVersion = System
            .getProperty("java.version");
    private static final int majorJavaVersion;
    public static String getJavaVersion() {
        return javaVersion;
    }
    public static int getMajorJavaVersion() {
        return majorJavaVersion;
    }
    public
 
 static boolean isAtLeastJava14() {
        return true;
    }
    public static boolean isAtLeastJava15() {
        return getMajorJavaVersion() >= 2;
    }
    public static boolean isAtLeastJava16() {
        return getMajorJavaVersion() >= 3;
    }
    static {
        //for jre 1.8
        if (javaVersion.indexOf("1.8.") != -1) {
            majorJavaVersion = 5;
        }else if (javaVersion.indexOf("1.7.") != -1) {
            majorJavaVersion = 4;
        } else if (javaVersion.indexOf("1.6.") != -1) {
            majorJavaVersion = 3;
        } else if (javaVersion.indexOf("1.5.") != -1) {
            majorJavaVersion = 2;
        } else {
            majorJavaVersion = 1;
        }
    }
}

這個類在spring的核心包下：即org.springframework.core包下。可以改下原始碼或者在自己的src下，建立一個同樣的包名（org.springframework.core），在包中加入這個類就可以了。名稱和spring的相同，它會載入我們的這個，不會在找spring下的了。