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Access denied for user ''#'localhost' (using password: NO) in Eclipse, instead of 'root'#'localhost', classpath corrupted [duplicate]

This question already has an answer here:
Exception in thread "main" java.sql.SQLException: Access denied for user ''#'localhost' (using password: NO)
(1 answer)
Closed 2 years ago.
I'm making a java project with SceneBuilder and Eclipse; i need to connect to a local database created using MySQL, but after running my Java code in eclipse i get the following error:
Exception in thread "main" java.sql.SQLException: Access denied for user ''#'localhost' (using password: NO)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.mysql.cj.jdbc.admin.TimezoneDump.main(TimezoneDump.java:70)
Instead of 'root'#'localhost' (using password: NO) that is a login credentials error, now i have ''#'localhost' (using password: NO).
Using MySQL workbench and command prompt, i can correctly access using "root"/"root", and launch queries on my db. Running the same Eclipseproject on another laptop or my home pc, i can run it without errors. So the problem is not in the code but in some setting of my current laptop.
I already tried to:
Uninstall and reinstall Eclipse.
Uninstall and reinstall mySQL products: Workbench, Server, J Connector.
Switch Eclipse workspace.
Open the 3306 port from windows firewall.
That's the part of the code where i try to connect to my db.
package model;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class UserDAO {
private static String USER = "root";
private static String PASS = "root";
private static String DB_URL = "jdbc:mysql://127.0.0.1:3306/beecological?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
private static String DRIVER_CLASS_NAME = "com.mysql.cj.jdbc.Driver";
public static boolean checkUsername(String username) {
Statement stmt = null;
Connection conn = null;
int res = 1;
try {
Class.forName(DRIVER_CLASS_NAME);
conn = DriverManager.getConnection(DB_URL, USER, PASS);
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
res = Queries.verifyUsernameAvailable(stmt, username);
stmt.close();
conn.close();
}catch (Exception e) {
e.printStackTrace();
}
if(res == 1) {
return false;
}
return true;
}
public static void saveUser(User instance) {
Statement stmt = null;
Connection conn = null;
try {
Class.forName(DRIVER_CLASS_NAME);
conn = DriverManager.getConnection(DB_URL, USER, PASS);
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
Queries.insertUser(stmt, instance);
stmt.close();
conn.close();
}catch (Exception e) {
e.printStackTrace();
}
}
public static boolean verifyLogin(User instance) {
Statement stmt = null;
Connection conn = null;
int res = 0;
try {
//caricamento driver mysql
Class.forName(DRIVER_CLASS_NAME);
conn = DriverManager.getConnection(DB_URL, USER, PASS);
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
res = Queries.verifyUserRegistered(stmt, instance);
stmt.close();
conn.close();
}catch (Exception e) {
e.printStackTrace();
}
if (res == 0) {
return false; //utente immesso non esiste
}
return true;
}
}

Solution
The problem was not about MySQL login credentials, but on Eclipse configuration.
In my folder project the .classpath and the .project files were corrupted. Infact going to myproject>right click>Run As..>Run Configurations the main class was setted as com.mysql.cj.jdbc.admin.TimezoneDump.main instead of my mainApp class. Trying to change there the main class file not worked, because for Eclipse the mainApp doesn't exist.
So this is what i've done to solve the error:
Delete the project from Eclipse (not on the disk)
Close Eclipse
Go to Project folder and delete .classpath and .project files
Open eclipse, go to File > Open projects from File System and choose the project directory
Right click on the project > Run As > Run Configurations and set the right Main class

Install Mysql driver on EC2 instance?

I have a Unix Instance ready on Amazon EC2 .I have installed mysql in it which is runnig on 3306 port. ( Note: It is not rds database from AWS)
I have created EmpDB databse in Mysql and have created Employee table. And I have written a java program to insert a row in Table.
Below is the code:
import java.sql.*;
import java.util.Calendar;
public class Test{
public static void main(String[] args) {
try{
String myDriver = "com.mysql.jdbc.Driver";
String myUrl = "jdbc:mysql://localhost:3306/TaskDB";
Class.forName(myDriver);
Connection conn = DriverManager.getConnection(myUrl, "root", "root");
String query = " insert into employee (id,name,dept,salary)"
+ " values (?, ?, ?, ?)";
PreparedStatement preparedStmt = conn.prepareStatement(query);
preparedStmt.setInt (1, 600);
preparedStmt.setString (2, "Rubble");
preparedStmt.setString(3, "startDate");
preparedStmt.setInt(4, 5000);
preparedStmt.execute();
conn.close();
} catch (Exception e){
System.err.println("Got an exception!");
e.printStackTrace();
}
}
When I am executing it via "java Test", getting below error:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(URLClassLoader.java:359)
at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
at java.security.AccessController.doPrivileged(Native Method)
at java.net
How I can install mysql connector on my Unix Instance?

Just copy the MySql-Connector.jar into Tomcat's lib folder, and then remove the jar from the webapp's lib folder, and then, re run the project.
import com.mysql.jdbc.Driver;

Put the driver in the same folder as my Test.java file, and compile it, resulting in Test.class.
So in this folder have
Test.class
mysql-connector-java-5.1.14-bin.jar
and I write this:
java -cp .;mysql-connector-java-5.1.14-bin.jar Test
This way if you not use any IDE just cmd in windows or shell in linux.

Not able to establish connection with Progress Database using JDBC

I am getting the following exception :-
java.sql.SQLException: [DataDirect][OpenEdge JDBC Driver][OpenEdge] Access denied(Authorisation failed)
at com.ddtek.jdbc.openedge.client.ddd.aw(Unknown Source)
at com.ddtek.jdbc.openedge.client.ddd.j(Unknown Source)
at com.ddtek.jdbc.openedge.OpenEdgeImplConnection.j(Unknown Source)
at com.ddtek.jdbc.openedgebase.BaseConnection.b(Unknown Source)
at com.ddtek.jdbc.openedgebase.BaseConnection.k(Unknown Source)
at com.ddtek.jdbc.openedgebase.BaseConnection.b(Unknown Source)
at com.ddtek.jdbc.openedgebase.BaseConnection.a(Unknown Source)
at com.ddtek.jdbc.openedgebase.BaseDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at com.ncr.sj250216.JdbcTest.main(JdbcTest.java:18)
There is no compile time error in my code, i am using the right jars as referenced libraries.
package com.ncr.sj250216;
import java.sql.*;
public class JdbcTest
{
public static String
URL="jdbc:datadirect:openedge://sun3899.daytonoh.ncr.com:28409;DatabaseName=dispatch";
public static String username="CSMSRUP";
public static String password=null;
public static void main(String [] args)
{
try
{
Class.forName ("com.ddtek.jdbc.openedge.OpenEdgeDriver");
System.out.println("Driver loaded");
Connection conn = DriverManager.getConnection(URL,username,password);
System.out.println("Connected");
Statement stmt = conn.createStatement();
System.out.println("Statement created");
ResultSet rs = stmt.executeQuery("select remark from pub.dupdate_remarks");
System.out.println("ResultSet : \n");
while (rs.next())
{
System.out.println(rs.getString(1));
}
System.out.println("AFTER CRUISING THROUGH THE RESULT SET");
rs.close();
stmt.close();
conn.close();
}
catch (Exception x)
{
x.printStackTrace();
}
}
}

Access denied and Authorization failed mean that you either have the wrong userid & password or you are attempting to connect to the wrong db.
If you have access to the server that the db runs on you can test your credentials using Progress' sqlexp command line tool:
sqlexp -user userName -password passWord -db dnName -S servicePort
Or you could use any popular Windows based SQL querying tool to try the connection...

Connecting to MySQL using JDBC [duplicate]

This question already has answers here:
Connect Java to a MySQL database
(14 answers)
Closed 7 years ago.
I have searched the internet trying to find solutions on using java and JDBC to connect to MySQL. Unfortunately I have found multiple answers and none that solved my problem.
I downloaded the JDBC from MySQL, and unzipped the file to find the .jar. I placed the .jar in my C:/Program Files (X86)/Java/JDK.../JRE/lib/ext folder. I set my environmental variable classpath (maybe CLASSPATH, ClassPath ??) to the following:
%CLASSPATH%;.;C:\Program Files (x86)\Java\jdk1.8.0_65\jre\lib\ext
I use the script I composed based on all the different solutions I have seen to get this:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class MySql {
public static void main(String[] args)
{
Connection con = getConnection();
if (con != null) {
System.out.println("Connection Made");
}
else {
System.out.println("Connection not made");
}
}
private static Connection getConnection() {
Connection con = null;
try {
Class.forName("com.mysql.jdbc");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sakila", "java", "java");
System.out.println("Connection Made");
conn.close();
}
catch (SQLException e)
{
System.out.println(e.getMessage());
System.exit(0);
}
catch (ClassNotFoundException e)
{
System.out.println(e.getMessage());
System.exit(0);
}
return con;
}
}
It compiles with javac MySql.java. Then when it runs (java MySql) I get com.mysql.jdbc. I have read that I don't need to register the driver, but when I remove Class.forName all I get is 'cannot find JDBC driver' error.
I can't narrow down my problem to either:
1). Classpath not setup correctly.
2). Improper java connection code.
3). Unable to locate MySQL server.
Any help would be appreciated.
Edit -
I placed the .jar file onto Desktop for testing purposes. Changed system classpath variable:
%CLASSPATH%;.;C:\User\User\Desktop\mysql-connector-java-5.1.38-bin.jar
Then when I add the trace for the error statement I get:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader.findClass<Unkown Source>
at java.lang.ClassLoader.loadclass (Unknown source)
at sun.misc.Launcher$AppClassLoader.loadclass(Unkown Source)
etc.
etc.
edit 2 - I have spent two days using Connect Java to a MySQL database as a resource and none of the instructions I have followed have solved my problem.

Instead of
System.out.println(e.getMessage());
Do this
e.printStackTrace();
You will see that the exception is:
java.lang.ClassNotFoundException: com.mysql.jdbc
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at MySql.getConnection(MySql.java:24)
at MySql.main(MySql.java:10)
Remove the Class.forName. You might get an access denied or some other error but it will solve the ClassNotFoundException. Here is the final edited version that should work:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class MySql {
public static void main(String[] args)
{
Connection con = getConnection();
if (con != null) {
System.out.println("Connection Made");
}
else {
System.out.println("Connection not made");
}
}
private static Connection getConnection() {
Connection con = null;
try {
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sakila", "java", "java");
System.out.println("Connection Made");
conn.close();
}
catch (SQLException e)
{
e.printStackTrace();
System.exit(0);
}
return con;
}
}

If you need Class.forName() you have to use correct class:
Class.forName("com.mysql.jdbc.Driver");
But with JDBC 4 that has become no longer needed.
Create full Exception stack traces and use the result to search here - most common errors have been solved here before.
NoSuitableDriverFound is a very strong indication your mysql-connector.jar (not the .zip....) is missing from your classpath when you run your code.
You could try like this:
Run java -cp .;C:\User\User\Desktop\mysql-connector-java-5.1.38-bin.jar MySql

I think you must add the path including the jar file name of the driver in your classpath. Like so:
%CLASSPATH%;.;C:\Program Files (x86)\Java\jdk1.8.0_65\jre\lib\ext\mysql-connector-java-xxx.jar

If your Java is version 6 or above you doesn't need Class.formName(...) code.
And for ensure that everything works, compile and execute your code in the follow way.
To compile:
java -cp PATH_TO_DRIVER; YOUR_CLASS.java
To execute:
java -cp PATH_TO_DRIVER; YOUR_CLASS
Change YOUR_CLASS to the name of your class and PATH_TO_DRIVER to the path where you download the MySQL driver.
Hope it helps!

Try this code!
public static void main(String[] argv) {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("Where is your MySQL JDBC Driver?");
e.printStackTrace();
return;
}
System.out.println("MySQL JDBC Driver Registered!");
Connection connection = null;
try {
connection = DriverManager
.getConnection("jdbc:mysql://localhost:3306/yourSCHEMAname,"login", "password");
} catch (SQLException e) {
System.out.println("Connection Failed! Check output console");
e.printStackTrace();
return;
}
if (connection != null) {
System.out.println("You made it, take control your database now!");
} else {
System.out.println("Failed to make connection!");
}
}
}

ClassNotFoundException in mvc application

I am getting ClassNotFoundException in this code when I run it on a server But as a stand alone java file it runs fine.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import UserJavaBean.UserJavaBean;
public class UserDataBase {
public int insert()
{
int flag =0;
try
{
UserJavaBean user= new UserJavaBean();
//Statement stmt= null;
PreparedStatement ps= null;
//ResultSet rs= null;
Connection conn;
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Class Loaded");
conn= DriverManager.getConnection("jdbc:oracle:thin:#localhost:****:orcl","hr","hr");
System.out.println("Connection Established");
// stmt= conn.createStatement();
int emp_id= user.getId();
String emp_name=user.getName();
String emp_des=user.getDesignation();
ps = conn.prepareStatement("insert into nanda values(?,?,?)" );
ps.setString(1,emp_name);
ps.setInt(2,emp_id);
ps.setString(3,emp_des);
ps.executeUpdate();
flag=1;
}
catch(Exception e)
{
e.printStackTrace();
flag=0;
}
System.out.println("flagvalue"+flag);
return flag;
}
}

You have not provided exception stacktrace. But I think you should provide the respective jar file of oracle.jdbc.driver.OracleDriver in class path as well as inside lib folder. You might have forget to provide the jar file inside lib folder of the project. As you are not getting any error during stand alone run, you have provide the jar file in class path and it is taking the class path jar file. But when you deploy your web application you have to provide the same jar file inside the lib folder. So that after deployment it will take the jar file from lib folder.
In a nutshell, After deployment, the class path jar files are not available for web app.
I think this will resolve your problem. Try it and let me know.