java.lang.UnsupportedClassVersionError TestCase

JavaFramework-JDK6.jar 放到JDK17运行没有问题

JavaFramework源码放到JDK17环境下编译出来的JavaFramework-JDK17.jar

JavaFramework-JDK17.jar 放到JDK17运行没有问题

JavaFramework-JDK17.jar 放到JDK8运行没有问题，这个好像不对啊，可能之前编译设置version之类

=====于是弄个新环境验证下=====

1)在JDK17新环境新建工程TestClazzVersion，写个公共类T，方法test

2）导出工程

3）生成 TestClazzVersion-JDK17.jar

4）把导出的 TestClazzVersion-JDK17.jar，放到JDK8的工程里面

5)然后就报错了【java.lang.UnsupportedClassVersionError】

4B1317DE7618D2A2569B1AC95AB1AAA4
Exception in thread "main" java.lang.UnsupportedClassVersionError: a/T has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at zwf.Test.main(Test.java:34)

JDK8 52

JDK11 55（印象中）

JDK17 61

6）拿源代码到JDK8环境编译个新的包吧TestClazzVersion-JDK8.jar，