spring低版本报错:java.lang.IllegalStateException: Context namespace element ‘annotation-config’ and its parser class [*] are only available on

参考来源：http://blog.csdn.net/sunxiaoyu94/article/details/50492083

使用spring低版本（2.5.6），使用jre 8发现错误：

Unexpected exception parsing XML document from class path resource [applicationContext-dao.xml]; 
nested exception is java.lang.IllegalStateException: Context namespace element ‘annotation-config’ 
and its parser class [org.springframework.context.annotation.AnnotationConfigBeanDefinitionParser] are only available on JDK 1.5 and higher

看源码是org.springframework.context.annotation.AnnotationConfigBeanDefinitionParser自动检测，jdk版本检测时需要jre1.5以上版本，

但是JdkVersion只检查到了1.7，jre1.8 时不匹配任何jdk，按如下方法处理，可以解决问题。

1、在项目中创建一个package为org.springframework.core
2、在该package下面新建JdkVersion.java，内容如下：

package org.springframework.core;  
  
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;  
        }  
    }  
}

3、到项目的WEB-INF/classes 下面找到对应的package中的JdkVersion.class文件

spring低版本报错:java.lang.IllegalStateException: Context namespace element ‘annotation-config’ and its parser class [*] are only available on

4、将项目中的spring-core-2.5.6.jar拷贝出来打开，然后将JdkVersion.class替换jar包中的该文件。（可以使用win rar打开jar包）

5、将修改后的spring-core-2.5.6.jar再覆盖到项目中。

这样就解决版本问题了。

spring低版本报错:java.lang.IllegalStateException: Context namespace element ‘annotation-config’ and its parser class [*] are only available on

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