Develop Reference

Issues with username and password when connecting to oracle database 12c through ojdbc

I have SQL developer installed and a properly configured DB, I create a user from sys like so:
CREATE USER random IDENTIFIED BY 12345;
GRANT ALL PRIVILEGES TO random;
I attempt to connect to the oracle SQL database with the ojdbc8.jar found in oracles website like this:
String url = "jdbc:oracle:thin:random/12345#localhost:1521:home";
try{
Connection dbConn = DriverManager.getConnection(url);
}catch(Exception e){
System.out.println("Exception: " + e.getLocalizedMessage());
}
However I receive this error:
Exception: ORA-01017: invalid username/password; logon denied
The last time I asked this question it was just populated by answers that have no actual answer to the problem at hand, I don't need to change the driver to a different one, I don't need to instantiate some sort of factory nonsense that just adds complexity, all I want to know is how I'm meant to connect to an account that is part of my DB so I can perform basic SQL functions.
Edit:
It just occurred to me that it is a pdb, is there a modification needed to the connection url that anyone can point out?

Try:
Connection dbConn = DriverManager.getConnection("jdbc:oracle:thin:#localhost:1521:home", "random", "12345");

PDB connections need a slight tweak.
Please use localhost:port/sid instead of localhost:port:sid:
if (isPluggableDB) {
conn = DriverManager.getConnection("jdbc:oracle:thin:#" + hostName + ":" + hostPort + "/" + sid, userName, password);
} else {
conn = DriverManager.getConnection("jdbc:oracle:thin:#" + hostName + ":" + hostPort + ":" + sid, userName, password);
}

"Could not create connection to database server" netbeans google cloud sql error

I am trying to create my first API using java httpServlet and netbeans which will be connected to a database on google cloud based its examples and documentations. I have not created the database, but I was given the necessary credentials and vars to create the connection. So I have downloaded the project from github, and when I tried to open it from netbeans there was some issues concerning dependencies ... So I resolved them, I replaced the credentials with their values and run the project; Unfortunately an error was thrown: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. I made some searches but did not get any result... Could it be an error from this code ? an error from database security if it was invisible on cloud? Any help is more than appreciated.
public class ListTables {
public static void main(String[] args) throws IOException, SQLException {
String instanceConnectionName = "<foo:foo:bar>";
String databaseName = "myDatabaseName ";
String username = "myUsername ";
String password = "<myPass>";
if (instanceConnectionName.equals("<insert_connection_name>")) {
System.err.println("Please update the sample to specify the instance connection name.");
System.exit(1);
}
if (password.equals("<insert_password>")) {
System.err.println("Please update the sample to specify the mysql password.");
System.exit(1);
}
String jdbcUrl = String.format(
"jdbc:mysql://google/%s?cloudSqlInstance=%s&"
+ "socketFactory=com.google.cloud.sql.mysql.SocketFactory",
databaseName,
instanceConnectionName);
try{
Connection connection = DriverManager.getConnection(jdbcUrl, username, password);
/* try (Statement statement = connection.createStatement()) {
ResultSet resultSet = statement.executeQuery("select * from wf_accounts;");
while (resultSet.next()) {
System.out.println(resultSet.getString(1));
}
}*/
}catch(Exception ex){
System.out.println("Error: " + ex.toString());
}
Update
Same error was thrown when I did this:
String jdbcUrl = String.format(
"jdbc:mysql://google/%s?cloudSqlInstance=%s&"
+ "socketFactory=com.google.cloud.sql.mysql.SocketFactory",
"",
"");
Any hints?

First you have to check whether the mysql server is running on.If you are Windows user you can simply
Go to Task Manager
Go to Services
then search for your Mysql server(eg:for my case its MYSQL56)
then you will see under the status column it says its not running
by right clicking and select start
If it's already running then you have to do as in mysql Documentation,
You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property
autoReconnect=true
to avoid this problem

android - sql server - connection either null or no suitable driver found

My connection java file contains :
try {
Log.i("Login", "Establishing Connection...");
// SET CONNECTIONSTRING
Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
Log.i("JDBC","found");
Connection DbConn = DriverManager.getConnection("<connection_string>");
Log.i("Login","Connected");
Statement stmt = DbConn.createStatement();
ResultSet insert = stmt.executeQuery("insert into UserLogin(username, password) values (admin, admin);");
ResultSet reset = stmt.executeQuery(" select * from UserLogin ");
Toast.makeText(this, reset.getString(1), Toast.LENGTH_SHORT).show();
DbConn.close();
// go to newsfeed
} catch (Exception e) {
Log.e("Error connection","" + e.getMessage());
}
When my connection string contains:
jdbc:jtds:sqlserver://, I gets error in connection :null,and when it's
jdbc:sqlserver://, I gets error in connection:no suitable driver found.
I'm trying to connect Android with Azure SQL DB.
I've seen Question1, Question2, Question3, Question4.
No Answer.

#NiravMadariya, The JDBC connection string with jTDS shoule be jdbc:jtds:sqlserver://<server>:<port>/<database>, please see the jTDS FAQ which includes URL format and the reason for No suitable driver exception.
Note, if you are using the JTDS JDBC driver for Auzre SQL DB, then you will need to add ssl=require to the URL of the connection string as like this jdbc:jtds:sqlserver://<server>:<port>/<database>?ssl=require.
Meanwhile, using Microsoft JDBC Driver for SQL Server is a recommend way for Azure SQL DB, please see https://azure.microsoft.com/en-us/documentation/articles/sql-database-develop-java-simple/.

How to specify path to mySQL using localhost?

I have been having issues specifying the path (I have two files: comments.frm and db.opt in the following folder: C:\xampp\mysql\data\feedback)... I am using XAMPP and mySQL. I am not sure why I am having an error? Please, take a look this part of my code:
public void readDataBase() throws Exception {
try {
// This will load the MySQL driver, each DB has its own driver
Class.forName("com.mysql.jdbc.Driver");
// Setup the connection with the DB
connect = DriverManager
.getConnection("jdbc:mysql://localhost//feedback"
+ "user=root&password=1234");
PS: My password for localhost is 12345678

You should try
DriverManager.getConnection("jdbc:mysql://localhost/feedback", "root", "1234");

For better clarity you can use the other overloaded method while getting connection.
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://<db_ip>/<db_name>",
"<username>", "<pwd>");

Try
connect = DriverManager
.getConnection("jdbc:mysql://localhost/feedback?user=root&password=1234")
(you forgot about the question mark after "feedback")

Many answers but everyone forgot the port of the database.
If you use mysql then try 3306 as db port.
http://www.petefreitag.com/articles/jdbc_urls/ - list of jdbc urls (Examples)
try
{
conn = DriverManager.getConnection("jdbc:mysql://" + dbHost + ":" + dbPort + "/" + dbName, user, passwd);
}
catch(SQLException sqle)
{
System.out.println("Connection fails: " + sqle.getMessage());
}

I think you need to use this:
DriverManager.getConnection("jdbc:mysql://localhost:3306/feedback", "root", "1234");
I check my old project and find that I don't use double slash here /feedback.
also you can specify encoding like this :
DriverManager.getConnection("jdbc:mysql://localhost:3306/feedback?characterEncoding=UTF-8&characterEncoding=Cp1251", "root", "1234");
and also one more advice. Don't use hard code. Get url, password and user name from property files.

Try this hope it can help you!!!
Class.forName("com.mysql.jdbc.Driver");
connect = DriverManager.getConnection("jdbc:mysql://localhost/feedback?"+"user=root&password=1234");
also see the URL Mistakes like:
jdbc:mysql://localhost//feedback?
// after localhost... check and try my code...
.

Why am I receiving this SQLException error stating that no suitable driver can be found?

I'm on a mac, running a MAMP instance of MySQL. I'm trying to use a jdbc driver to connect my java code to a database called 'test', working with a table called 'customer.' I keep getting an error:
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:8889/test
I'm not sure if the problem is with my code, or if it's a configuration problem with the MAMP instance of MySQL, or if it's something else entirely.
I have an initialize driver method:
public void initializeDriver(){
try{
Class.forName("com.mysql.jdbc.Driver");
}
catch(ClassNotFoundException e) {
System.err.println(e.toString());
}
}
And I have a connection created in the following way:
public void insertCustomer(String connectionUrl, String connectionUser, String connectionPassword, Customer customer) {
try{
Connection conn = DriverManager.getConnection(connectionUrl, connectionUser, connectionPassword);
Statement constat = conn.createStatement();
String query = "INSERT INTO customers (customer_id, email, deliverable, create_date) VALUES (" + customer.id + ", " + customer.emailAddress + ", " + customer.deliverable + ", " + customer.createDate + ")" ;
constat.executeQuery(query);
conn.close();
}
catch(SQLException e){
System.out.println(e.toString());
}
}
And I have downloaded mysql-connector-java-5.1.20 and set it in my classpath.
If anyone has any suggestions for how I could correct this error, I would be really grateful!

You have to put MySQL jdbc connector jar library into the classpath.
Then initialize the driver before opening the connection with code like the following :
Class.forName("com.mysql.jdbc.Driver").newInstance();

You will need the corresponding mysql JDBC driver jar in your classpath or loadable by your container. See the doc for ConnectorJ and note the installation instructions.

Try to add mysql-connector-java-5.1.20.jar to Glassfish (or Tomcat) lib folder.

you have also a error in this row
constat.executeQuery(query);
if you want insert some data in data base you have to use this code
constat.executeUpdate(query);