UnsupportedClassVersionError when trying to generate a jar

I have compiled my code and everything else and when I open the file .jar created it says A JNI error has occured

cmd:

C:\Projetos\Java\Projetos\Projeto02>java -jar Gerar.jar
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: principal has been compiled by a more recent version of the Java Runtime (class file version 53.0), 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(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(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 sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Code:

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.text.*;

class principal {

public static void main(String[] args){

        /*cria o layout e a janela */
        JFrame frame = new JFrame("Gerador");
        JPanel panel = new JPanel(new GridBagLayout());


        /*JLabel do lado dos objetos*/
        GridBagConstraints gbc8 = new GridBagConstraints();
        gbc8.anchor = GridBagConstraints.EAST;
        gbc8.gridx = 0;
        gbc8.gridy = 0;
        JLabel itml = new JLabel("Nome do Arquivo:");
        panel.add(itml, gbc8);

        /*Cria e posiciona o JTextField*/
        GridBagConstraints gbc1 = new GridBagConstraints();
        gbc1.anchor = GridBagConstraints.WEST;
        gbc1.gridx = 1;
        gbc1.gridy = 0;
        JTextField texto = new JTextField();
        texto.setColumns(10);
        panel.add(texto, gbc1);

        /*Cria e posiciona o JComboBox*/
        String[] items = {".txt", ".java", ".html", ".php", ".xml", ".odt", ".ods", ".jar", ".sql", ".pdf"};
        JComboBox combo = new JComboBox(items);
        combo.setBackground(Color.WHITE);
        GridBagConstraints gbc2 = new GridBagConstraints();
        gbc2.anchor = GridBagConstraints.WEST;
        gbc2.gridx = 1;
        gbc2.gridy = 1;
        panel.add(combo, gbc2);

        /*JLabel do lado dos objetos*/
        GridBagConstraints gbc9 = new GridBagConstraints();
        gbc9.anchor = GridBagConstraints.EAST;
        gbc9.gridx = 0;
        gbc9.gridy = 1;
        JLabel itm2 = new JLabel("Extens\u00e3o:");
        panel.add(itm2, gbc9);

        /*Cria e posiciona o JButton*/
        GridBagConstraints gbc3 = new GridBagConstraints();
        gbc3.anchor = GridBagConstraints.WEST;
        gbc3.gridx = 1;
        gbc3.gridy = 2;
        JButton butao = new JButton("Gerar");
        panel.add(butao, gbc3);


        butao.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e)
        {

            String arquivo = texto.getText() + combo.getSelectedItem();
            File file = new File(arquivo);

            texto.setText("");
            combo.setSelectedIndex(0);
            try{file.createNewFile();}catch(IOException ex){ex.printStackTrace();}




        }
        });

        /*Configurações da janela*/
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        frame.setSize(250, 250);
        frame.getContentPane().add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

}