Debugging process can not be found by f5 into the jdk source

 

 

debug mode, fis = new FileInputStream (file); break point line debugging process can not be found by f5 into the jdk source

package com.lzl.spring.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.junit.Test;

public class Test1   {
    
    private static String name="C:\\Study\\2401.jpg_wh1200.jpg";
    
    public static  void inputStream()  {
        try {
            InputStream a=new FileInputStream(name);
        } catch (FileNotFoundException e) {
            String message = e.getMessage();
            System.out.println(message);
            e.printStackTrace();
        }
    }
    
    @Test
    public void test11() {
//        inputStream();
        Person per=new Student("haha");
        per.doSomething();
    }
    public static void main(String[] args) {

        FileInputStream fis=null;
        try {
            File file=new File(name);
            fis=new FileInputStream(file);
            int available = fis.available();
            System.out.println(available);
            long n=500000;
            fis.skip(n);
            int available2 = fis.available();
            System.out.println("available2 is  "+available2 );
            
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }finally {
            if(fis!= null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    

After checking the information found:
eclipse default is java environment using JRE (Java Runtime Environment that is java runtime environment) environment, jre environment does not support debugging; you need to replace the JDK eclipse environment. View eclipse operating environment as follows: window -> preference -> java -> Installed JREs -> right side will see the eclipse of java environment.
Since it will eclipse JRE does not allow debugging environment into jdk configuration is as follows:

The first step to find the JREs environment configuration Installed

 

 

 

 

Step two: the reference environment to debug the project into the jdk (ie Buil Path) as shown:

You can now debug and trace the source of the jdk