java报错出现未知源

(当然我在Eclipse的构建路径中导入了JFeatureLib提供的jar文件)

所以我在项目的链接中使用了代码,并编写了一些代码来调用它.这是我创建一个Frame的代码,打开图片并在该链接上调用Moravec算法：

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

public class Compare{

public Compare(){

JFrame frame = new JFrame("Find corners in picture");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel panel = (JPanel)frame.getContentPane();

JLabel label = new JLabel();

label.setIcon(new ImageIcon("house.jpg"));

panel.add(label);

frame.setLocationRelativeTo(null);

frame.pack();

frame.setVisible(true);

}

public static void main (String[] args){

SwingUtilities.invokeLater(new Runnable(){

public void run(){

new Compare();

}

});

Moravec picture = new Moravec();

}

}

关键是它在线上返回一个错误

Moravec picture = new Moravec();

这个错误是这样的：

Exception in thread "main" java.lang.UnsupportedClassVersionError: de/lmu/ifi/dbs/jfeaturelib/pointDetector/PointDetector : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(Unknown Source)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$000(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(Unknown Source)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$000(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at Compare.main(Compare.java:32)

你能给我一些建议吗？

非常感谢！

解决方法:

不支持的major.minor版本51.0

您正尝试在较旧的Java版本中运行使用较新Java版本编译的jar.消息建议使用JDK7编译de / lmu / ifi / dbs / jfeaturelib / pointDetector / PointDetector,但是您尝试使用旧版本运行它(我猜Java 6).

执行java -version并查看是否是这种情况.如果是这样,请在您的系统上找到JDK7并使用它来运行您的程序.

标签：java,classloader

来源： https://codeday.me/bug/20190728/1565644.html