List absolute paths for files in Linux

Following Linux command can be used to list absolute file paths.

ls -d /apps/*

Selenium testing in JAVA

Following JAVA code can be used to test web application with login page, filtering data and submit form.

You have to install web browser driver. I used chrome driver.

pom.xml

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>3.141.59</version>
</dependency>
 
JAVA code

System.setProperty("webdriver.chrome.driver","./driver/chromedriver.exe");
WebDriver driver = new ChromeDriver();

String baseUrl = "https://testwebsite/login";
driver.get(baseUrl);

//maximizing window
driver.manage().window().maximize();

//get login form details
WebElement username = driver.findElement(By.name("username"));
WebElement password = driver.findElement(By.name("password"));
WebElement login = driver.findElement(By.xpath("//input[@value='Login']"));

// login to site
username.sendKeys("admin");
password.sendKeys("admin@123");
login.click();

// filtering using placeholder
WebElement fullName = driver.findElement(By.xpath("//input[@placeholder='Filter Full Name']"));
WebElement country = driver.findElement(By.xpath("//input[@placeholder='Filter Country']"));
WebElement filter = driver.findElement(By.xpath("//input[@value='Filter']"));

// filter sujith & Sri Lanka
fullName.sendKeys("Sujith");
country.sendKeys("Sri Lanka");
filter.click();

// add new record to list 
WebElement add = driver.findElement(By.xpath("//*[text()='Add New']"));
add.click();

//filter by name
WebElement frmFullName = driver.findElement(By.name("fullName"));
WebElement frmAge = driver.findElement(By.name("age"));
WebElement frmAddress = driver.findElement(By.name("address"));
//filter by placeholder
WebElement frmBirthPicker = 
driver.findElement(By.xpath("//input[@placeholder='yyyy-mm-dd']"));
WebElement frmCountry = driver.findElement(By.name("country"));
//filter by parent input with 'GIT' label
WebElement frmGIT = driver.findElement(By.xpath("//label[contains(., 'GIT')]/parent::*//input"));
WebElement frmHTML = driver.findElement(By.xpath("//label[contains(., 'HTML')]/parent::*//input"));
WebElement frmMale = driver.findElement(By.id("Male"));

frmFullName.sendKeys("Test full name");
frmAge.sendKeys("24");
frmAddress.sendKeys("Test address1");
frmBirthPicker.sendKeys("2010-10-10");
frmCountry.sendKeys("Sri Lanka");
//checking buttons
frmGIT.click();
frmHTML.click();
frmMale.click();

//submitting form  
WebElement submit = driver.findElement(By.xpath("//input[@value='Submit']"));
submit.click();
    
// driver.close();

use VisualVM to monitor JAVA application

Run the JAVA application with the following options.

java8 -jar 
-Dcom.sun.management.jmxremote 
-Dcom.sun.management.jmxremote.port=8662 
-Dcom.sun.management.jmxremote.rmi.port=8662 
-Dcom.sun.management.jmxremote.local.only=false 
-Dcom.sun.management.jmxremote.authenticate=false 
-Dcom.sun.management.jmxremote.ssl=false 
-Xms32m 
-Xmx128m 
TestVisualVM.jar

Now, connect the remote JMX session in 8662 port in VisualVM to monitor application.

When reading emails from JAVA application, it returns content body in xhtml format. Following code can be used to convert xhtml tages to html.

org.jsoup.nodes.Document document = Jsoup.parseBodyFragment(xhtml);

document.outputSettings().escapeMode(Entities.EscapeMode.xhtml);

String str = document.body().html();

Authenticate AD user in JAVA

Use following JAVA applications to authenticate AD user in JAVA. More information can be found on following URL.

https://stackoverflow.com/questions/390150/authenticating-against-active-directory-with-java-on-linux

import com.sun.jndi.ldap.LdapCtxFactory;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import java.util.Iterator;
import javax.naming.Context;
import javax.naming.AuthenticationException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import static javax.naming.directory.SearchControls.SUBTREE_SCOPE;

class App2 {

    public static void main(String[] args) {

        String domainName;
        String serverName;

            domainName = "mobitel.int";
            serverName = "HO-AD-001";
        

        String username = "sujith";
        String password = "passwd";

        System.out
                .println("Authenticating " + username + "@" + domainName + " through " + serverName + "." + domainName);

        // bind by using the specified username/password
        Hashtable props = new Hashtable();
        String principalName = username + "@" + domainName;
        props.put(Context.SECURITY_PRINCIPAL, principalName);
        props.put(Context.SECURITY_CREDENTIALS, password);
        DirContext context;

        try {
            context = LdapCtxFactory.getLdapCtxInstance("ldap://" + serverName + "." + domainName + '/', props);
            System.out.println("Authentication succeeded!");

            // locate this user's record
            SearchControls controls = new SearchControls();
            controls.setSearchScope(SUBTREE_SCOPE);
            NamingEnumeration renum = context.search(toDC(domainName),
                    "(& (userPrincipalName=" + principalName + ")(objectClass=user))", controls);
            if (!renum.hasMore()) {
                System.out.println("Cannot locate user information for " + username);
                System.exit(1);
            }
            SearchResult result = renum.next();

            List groups = new ArrayList();
            Attribute memberOf = result.getAttributes().get("memberOf");
            if (memberOf != null) {// null if this user belongs to no group at all
                for (int i = 0; i < memberOf.size(); i++) {
                    Attributes atts = context.getAttributes(memberOf.get(i).toString(), new String[] { "CN" });
                    Attribute att = atts.get("CN");
                    groups.add(att.get().toString());
                }
            }

            context.close();

            System.out.println();
            System.out.println("User belongs to: ");
            Iterator ig = groups.iterator();
            while (ig.hasNext()) {
                System.out.println("   " + ig.next());
            }

        } catch (AuthenticationException a) {
            System.out.println("Authentication failed: " + a);
            System.exit(1);
        } catch (NamingException e) {
            System.out.println("Failed to bind to LDAP / get account information: " + e);
            System.exit(1);
        }
    }

    private static String toDC(String domainName) {
        StringBuilder buf = new StringBuilder();
        for (String token : domainName.split("\\.")) {
            if (token.length() == 0)
                continue; // defensive check
            if (buf.length() > 0)
                buf.append(",");
            buf.append("DC=").append(token);
        }
        return buf.toString();
    }
}

Retrieve AD server details

Use following command to get AD server details in command prompt.

nslookup -type=srv _ldap._tcp.DOMAINNAME

Sub directory size in Linux/Solaris

Following command can be used to retrieve directory sizes in Linux. Below command returns 5 largest files in any sub directory in /apps/ directory.

find /apps/ -type f -ls | sort -k 7 -r -n | head -5