解决AnnotationTransactionAttributeSource is only available on Java 1.5 and highe

由于项目需要把jdk升级成为了jdk8，在eclipse中导入一个jdk1.6的项目，启动tomcat的时候，报错：

AnnotationTransactionAttributeSource is only available on Java 1.5 and highe

想要解决这个错误，一般有两种办法：

1、将jdk8换成jdk7，重新启动项目就好了（由于另一个项目必须是jdk1.8，所以降版本不现实）。

2、第二种手动修改spring的jar包，在org.springframework.core目录下，有一个JdkVersion.class，自己参照包路径，重新写一个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;
            }
        }
    }


写好之后，编译成.class文件，放到spring的jar包中，替换项目jar包，重新启动，就好了。