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Clean a RandomAccessFile


Clean a RandomAccessFile

By : g_dann
Date : October 28 2020, 04:55 PM
I hope this helps you . You can use RandomAccessFile.setLength(0) to truncate the file.
code :


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How the RandomAccessFile class returns bytes with randomAccessFile.read() method;

How the RandomAccessFile class returns bytes with randomAccessFile.read() method;


By : amit
Date : March 29 2020, 07:55 AM
Any of those help You should use readFully
code :
    try (RandomAccessFile raf = new RandomAccessFile("filename", "r")) {
        byte[] document = new byte[(int) raf.length()];
        raf.readFully(document);
    }
class Test {
    public static void main(String args[]) {
        // here is where chars will be stored. If printed now, will show random junk
        char[] buffer = new char[5];

        // call our method. It does not "return" data.
        // It puts data into an array we already created.
        putCharsInMyBuffer(buffer);

        // prints "hello", even though hello was never "returned"
        System.out.println(buffer);
    }

    static void putCharsInMyBuffer(char[] buffer) {
        buffer[0] = 'h';
        buffer[1] = 'e';
        buffer[2] = 'l';
        buffer[3] = 'l';
        buffer[4] = 'o';
    }
}
How to close a RandomAccessFile

How to close a RandomAccessFile


By : aelyseev
Date : March 29 2020, 07:55 AM
this will help When you are trying to access the RandomAccessFile length(), method, it is already closed and thus you cannot access it anymore. You probably want to use the length() method of File. Your loop cannot work as the RandomAccessFile was already closed.
But I must admit I am clueless on the low level reason why rfmRandomAccessFile would not really be closed. It could be a side effect of your strange loop trying to get the size of a closed file.
code :
package com.company;

import java.io.*;

public class Main {

    public static void main(String[] args)  {
        File file = new File("foobar.txt");
        RandomAccessFile randomAccessFile = null;
        try {
            randomAccessFile = new RandomAccessFile(file, "rws");
            randomAccessFile.write(new byte[]{'f'});
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(randomAccessFile !=null){
                try {
                    randomAccessFile.close();
                } catch (IOException e) {
                    //doh!
                }
            }
        }
        FileReader reader = null;
        try {
            reader = new FileReader(file);
            char read = (char) reader.read();
            System.out.println("what was written: "+read);
            System.out.println("file size: "+file.length());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(reader !=null){
                try {
                    reader.close();
                } catch (IOException e) {
                    //doh!
                }
            }
        }
    }
}
Get RandomAccessFile from JAR archive

Get RandomAccessFile from JAR archive


By : user1210269
Date : March 29 2020, 07:55 AM
this will help Resources are not files, and they live in a JAR file, which is not a random access medium.
'mvn clean' vs.'mvn clean install' (when a plugin execution is attached to 'clean')

'mvn clean' vs.'mvn clean install' (when a plugin execution is attached to 'clean')


By : Rohit Kumar
Date : March 29 2020, 07:55 AM
will be helpful for those in need Maven first analyses the pom.xml and then calls the goals/phases. The analysis itself is complicated and has different depths, so I guess that calling clean alone will not make Maven analyse the dependencies, but calling clean install does so. Note that the analysis of the POM only happens once, not again for every goal/phase.
Generally, your approach cannot be recommended. Usually, you put project dependencies into remote Maven repositories, so that they can be resolved through them. If you work inside a company, you should set up a Nexus/Artifactory server that handles your artifacts.
How to solve "Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean (default-clean) on pro

How to solve "Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean (default-clean) on pro


By : Ufuk
Date : March 29 2020, 07:55 AM
will help you This usually happens in Windows environments when the target folder is "locked". E.g. when you are running your web application (looks like you do) and want to perform a mvn clean. The application server/servlet engine locks the files so that mvn clean cannot delete the files because they are locked. Try to run this command when the web application is not running.
Edit: This also may happen if you have the target folder open in explorer or editing a text file from target folder, etc.
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