我的电脑有以下版本的Java:
~/a/172> java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
我写了一个相当短的程序Graph.java(http://www.filedropper.com/graph_1)并使用我的计算机上的javac将其编译成Graph.class。然后我把它scp到Amazon Linux机器(默认的)
[ec2-user@ip-172-31-24-15 ~]$ java -version
java version "1.7.0_91"
OpenJDK Runtime Environment (amzn-2.6.2.2.63.amzn1-x86_64 u91-b00)
OpenJDK 64-Bit Server VM (build 24.91-b01, mixed mode)
然后我试着运行它:
[ec2-user@ip-172-31-24-15 ~]$ java Graph
Exception in thread "main" java.lang.UnsupportedClassVersionError: Graph : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
为什么会发生这种情况,我该如何解决?
答案 0 :(得分:2)
这是因为您正在使用java 1.8编译代码并尝试在java 1.7上运行。 您应该在javac命令中添加以下内容
javac -source 1.7 -target 1.7