Cannot connect to MySQL database, using Struts2 and jdbc - mysql

Question

I am trying to connect to a database using JDBC and MySQL driver in
Struts2 using Eclipse IDE, but I am getting an error as access is denied, Can any one please help me out here ? Thanks in advance
pom.xml is
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>testdatabase</groupId>
<artifactId>testdb</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>2.3.24</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
</dependencies>
</project>
Action class is
public String execute()
{
Connection con=null;
String URL = "jdbc:mysql://localhost/hadoopinfo";
String ret = ERROR;
try
{
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Driver loaded!");
}
catch(Exception e)
{
e.printStackTrace();
}
try {
con = DriverManager.getConnection(URL, "root", "root123");
System.out.println("Connected to DataBase");
}
catch(Exception e)
{
System.out.println("seems problem with either URL or
User and Password ");
e.printStackTrace();
}
error is
Driver loaded!
seems problem with either URL or User and Password
java.sql.SQLException: Access denied for user 'root'#'localhost' (using
password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:998)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3847)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3783)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
at`com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication
(MysqlIO.java:`1665)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1207)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2249)
at
`com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2280)`
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2079)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
`Source)`
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:400)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)

Answer 1

Assuming, you are able to connect through command prompt (Outside the application)
Run this query in sql editor, and check the result
SELECT * FROM mysql.user
See if you have an entry as Host localhost and User root,
If Not : Create one
If Yes : Your password is wrong.
You are connected to Mysql using % as the host. Change your password for Host localhost
Note: For resetting the password for root, follow this link https://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html