解決AnnotationTransactionAttributeSource is only available on Java 1.5 and highe

由於項目需要把jdk升級成為了jdk8，在eclipse中導入一個jdk1.6的項目，啟動tomcat的時候，報錯：

AnnotationTransactionAttributeSource is only available on Java 1.5 and highe

想要解決這個錯誤，一般有兩種辦法：

1、將jdk8換成jdk7，重新啟動項目就好了（由於另一個項目必須是jdk1.8，所以降版本不現實）。

2、第二種手動修改spring的jar包，在org.springframework.core目錄下，有一個JdkVersion.class，自己參照包路徑，重新寫一個JdkVersion.java，如下所示：


    package org.springframework.core;
     
    public 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;
            }
        }
    }


寫好之后，編譯成.class文件，放到spring的jar包中，替換項目jar包，重新啟動，就好了。