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Use domain name to connect to embedded Apache FtpServer

I'm trying to set up a simple test FTPS server in Java using Apache FtpServer and connect to it using a domain name instead of the IP address.
I've pointed the A record to the IP address and set up the SSL certificate. Based on the Apache FtpServer documentation, here is what my code looks like so far:
FtpServerFactory ftpServerFactory = new FtpServerFactory();
ListenerFactory listenerFactory = new ListenerFactory();
listenerFactory.setPort(990);
listenerFactory.setServerAddress("example.com");
SslConfigurationFactory sslConfigurationFactory = new SslConfigurationFactory();
sslConfigurationFactory.setKeystoreFile(JKS);
sslConfigurationFactory.setKeystorePassword(JKS_PASS);
listenerFactory.setSslConfiguration(sslConfigurationFactory.createSslConfiguration());
listenerFactory.setImplicitSsl(true);
ftpServerFactory.addListener("default", listenerFactory.createListener());
PropertiesUserManagerFactory userManagerFactory = new PropertiesUserManagerFactory();
userManagerFactory.setFile(USERS_PATH.toFile());
BaseUser test = new BaseUser();
sample1.setName("test");
sample1.setPassword("test");
sample1.setHomeDirectory(HOME.getAbsolutePath().toString());
test.setAuthorities(List.of(new WritePermission());
UserManager userManager = userManagerFactory.createUserManager();
try {
userManager.save(test);
}
catch (FtpException e) {
e.printStackTrace();
}
ftpServerFactory.setUserManager(userManager);
FtpServer server = ftpServerFactory.createServer();
try {
server.start();
}
catch (FtpException e) {
e.printStackTrace();
}
However, when I try to connect to the FTPS server, I get an ECONNREFUSED - Connection refused by server from my FTPS client.
Are there any steps that I missed?

If your client reports a 'connection refused' that usually indicates (no guarantee) that no firewall prevented the TCP traffic, the connection request ended up on the intended machine but nothing was accepting the connection on the port you tried to connect to.
Things you can check:
Was the server process running? Was the server process on the correct port? Did the client connect to the correct port?
You might try to connect with another client (e.g. curl) just to see whether the TCP connection can be established.
You might try to connect to another port (e.g. 22 / ssh) to see if the client can establish the connection.

Unable to Connect to Hbase through Java

I am trying to connect to Hbase from Java. Hbase -Version 1.0.0
But I am unable to connect it. Kindly tell me what I am missing as I am new to Hbase.
Here is my code
public class HbaseAddRetrieveData{
public static void main(String[] args) throws IOException {
TableName tableName = TableName.valueOf("stock-prices");
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.master","LocalHost:60000");
conf.set("hbase.zookeeper.property.clientPort", "2181");
conf.set("hbase.zookeeper.quorum", "LocalHost");
conf.set("zookeeper.znode.parent", "/hbase-unsecure");
System.out.println("Config set");
Connection conn = ConnectionFactory.createConnection(conf);
System.out.println("Connection");
Admin admin = conn.getAdmin();
if (!admin.tableExists(tableName)) {
System.out.println("In admin");
admin.createTable(new HTableDescriptor(tableName).addFamily(new HColumnDescriptor("cf")));
}
Table table = conn.getTable(tableName);
Put p = new Put(Bytes.toBytes("AAPL10232015"));
p.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("close"), Bytes.toBytes(119));
table.put(p);
Result r = table.get(new Get(Bytes.toBytes("AAPL10232015")));
System.out.println(r);
}
Below is the error I am facing :
Exception in thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException: Can't get the locations
at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:305)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:131)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:56)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:287)
at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:267)
at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:139)
at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:134)
at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:823)
at org.apache.hadoop.hbase.MetaTableAccessor.fullScan(MetaTableAccessor.java:601)
at org.apache.hadoop.hbase.MetaTableAccessor.tableExists(MetaTableAccessor.java:365)
at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:281)
at com.tcs.healthcare.HbaseRetrieveData.main(HbaseRetrieveData.java:32)
Kindly guide me through this

change L in localhost to l and 'H' to 'h'
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.master","localhost:60000");
conf.set("hbase.zookeeper.property.clientPort", "2181");
conf.set("hbase.zookeeper.quorum", "localhost");
conf.set("zookeeper.znode.parent", "/hbase-unsecure");
If you are using remote machine, then conf.set("hbase.master","remotehost:60000"); even its not working then you check all the jars (which are remote) in the classpath
if you are using maven you can point to the jars which are there in cluster.
you can go to cluster and check below command to know the version of jars which are there in remote machine.
`hbase classpath`
Same version jars should be there in your client machine. For ex hbasex.jar in the remote machine and you are using hbasey.jar then it wont connect.
Moreover, please check from client machine you can able to ping server/cluster or not. Generally there will be firewall restrictions.

Unable to establish database connection to SQL Server 2008 using java in Eclipse IDE

I am trying to connect to HP Operations Manager Database using Java code in Eclipse IDE.
I am able to connect successfully through Microsoft SQL Server Management Studio 2008 but it fails through code.
I have installed "Microsoft JDBC Driver 4.0 for SQL Server"
Code:
import java.sql.*;
public class ConnectDatabase {
Connection dbConnection = null;
String dbName = "openview";
String serverip="10.105.219.102";
String serverport="1433";
String url = "jdbc:sqlserver://"+serverip+"\\OVOPS;databaseName="+dbName+"";
String userName = "HPOM-QA-WIN\\Administrator";
String password = "Nbv12345";
final String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
Statement statement = null;
ResultSet rs = null;
int updateQuery = 0;
public Connection getConnection() {
System.out.println(url);
try{
Class.forName(driverName).newInstance();
dbConnection = DriverManager.getConnection(url,userName,password);
System.out.println(DriverManager.getDrivers());
statement = dbConnection.createStatement();
String QueryString = "select Id from openview.dbo.OV_MS_Message where OriginalServiceId like '{FaultDn[1]}'";
updateQuery = statement.executeUpdate(QueryString);
if(updateQuery!=0){
System.out.println("success" + updateQuery);
}
statement.close();
dbConnection.close();
}catch (Exception e){
e.printStackTrace();
}
return dbConnection;
}
public static void main(String[] args) {
ConnectDatabase cDB = new ConnectDatabase();
cDB.getConnection();
}
}
I get the following error when I execute this code:
jdbc:sqlserver://10.105.219.102\OVOPS;databaseName=openview com.microsoft.sqlserver.jdbc.SQLServerException: The connection to the host 10.105.219.102, named instance ovops failed. Error: "java.net.SocketTimeoutException: Receive timed out". Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434. For SQL Server 2005 or later, verify that the SQL Server Browser Service is running on the host.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.getInstancePort(SQLServerConnection.java:3589)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.primaryPermissionCheck(SQLServerConnection.java:1225)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:972)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.ucs.test.ConnectDatabase.getConnection(ConnectDatabase.java:27)
at com.ucs.test.ConnectDatabase.main(ConnectDatabase.java:51)
When I change the url to
String url = "jdbc:sqlserver://"+serverip+"\\OVOPS:"+serverport+";databaseName="+dbName+"";
I get the below error:
jdbc:sqlserver://10.105.219.102\OVOPS:1433;databaseName=openview com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'HPOM-QA-WIN\Administrator'. ClientConnectionId:f1d323b7-9998-418c-b2a2-f2a7bd7b9b04
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:216)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:254)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:84)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:2908)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:2234)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$000(SQLServerConnection.java:41)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:2220)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:5696)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1715)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1326)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.ucs.test.ConnectDatabase.getConnection(ConnectDatabase.java:27)
at com.ucs.test.ConnectDatabase.main(ConnectDatabase.java:51)
I have explicitly added an inbound rule in windows firewall to allow UPD traffic on 1434 port, then disabled the firewall. But I still get this error.
The credentials provided here are used for connection using Microsoft SQL Server Management Studio and it works perfectly fine. But it fails through the code.
I am not sure where I am going wrong. I am unable to establish a successful connection through the code. Please help me.

Hey Thanks all for your responses. Finally I was able to resolve the issue. The problem was with the url and auth dll. Changed the url to
"jdbc:sqlserver://10.105.219.102:1433;instance=OVOPS;DatabaseName=openview;integratedSecurity=true"
and added the location of "sqljdbc_auth.dll" in java.library.path. It worked!
Thanks again for your efforts to help me :)

It took me a while to sort this issue out, but you have to head into the SQL Server Configuration Manager application. When that's loaded, expand the [SQL Native Client 11.0 Configuration] > Client Protocols.
Enable all three (Shared Memory, TCP/IP, and Named Pipes), if they aren't already.
Then click on TCP/IP and ensure that the default port is 1433.
If you have a 32bit system or version of SQL Server installed, do the same in the SQL Native Client 11.0 Configuration (32it) menu, enabling Shared Memory, TCP/IP, and Named Pipes and setting the default port to 1433.
Then click open the [SQL Server Network Configuration] or (32bit if applicable), and select the [Protocols for "YOURSERVERNAME"].
Ensure again that Shared Memory, TCP/IP, and Named Pipes are all enabled.
Then click on the [TCP/IP] Protocol Name, then select the [IP Addresses] tab at the top of the new popup window. For IP1 ensure that Active is YES; Enabled is YES (this is No by default, even if it is Active); and set the TCP Port to 1433 (tbh I don't know if you have to do this step, but I did and it worked!!); my TCP Dynamic Ports are set to 0 and I didn't change any of the IP addresses;
I did the same thing for IP10, which has IP: 127.0.0.1, which is the local machine.
I also scrolled down to the bottom of the page, and set IPAll TCP Ports to 1433, (dynamic ports is 49163).
Then you need to Apply all changes, close the properties window, and click on SQL Server Services in SQL Server Configuration Manager, and restart all running Servers.
This should do it :D

Catch example:
String url = "jdbc:sqlserver://localhost:1433/databaseName";
String username = "user";
String password = "pass";
Connection connection = DriverManager.getConnection(url, username, password);
1433 is default port.
Dont use '\' in url.

This is probably not an answer to your question, but I hope this will help you. Here is the way how to properly return connection (mysql):
import java.sql.*;
public class ConnectToDatabase{
public Connection getConn(){
final String DBPATH="jdbc:mysql://localhost:3306/mydb";
final String DBUSER="root";
final String DBPASS="";
Connection conn=null;
try {
conn = DriverManager.getConnection(DBPATH,DBUSER,DBPASS);
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
}

Try changing your database user password. Make sure new password doesn't have special characters.
I faced same problem and it got resolved after changing the db password.
Steps of my workaround:
I was getting sqlserverexception.java 190 error stating unable to connect to host port: 4500 which was my localhost port.
Opened Sql Server Configuration Manager -> SQL Server Network Configuration -> Protocols for MSSQLSERVER -> Enabled TCP/IP.
Checked TCP port number. It was 1433. So I changed 4500 to 1433 in my registry file.
After following above steps, I got a different error this time startingpassword for my db user(sql-test) is incorrect. I changed the password to sqltest123 and it worked.

JDBC Example for java

I have downloaded JDK 6 and also I have sqljdb4.jar and I have database.properties file that content the following data
database.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
database.url=jdbc:sqlserver://.;databaseName=UserInfo;integratedSecurity=true;
database.username=sa
database.password=admin
B.N : I'm installing the server on my machine and the server name = . , also I'm using Windows Authontication
My problem now is when I try to create connection I have the following error
com.microsoft.sqlserver.jdbc.SQLServerException:
The TCP/IP connection to the host
localhost, port 1433 has failed.
Error: Connection refused: connect.
Please verify the connection
properties and check that a SQL Server
instance is running on the host and
accepting TCP/IP connections at the
port, and that no firewall is blocking
TCP connections to the port. at
com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:130)
I don't know what is the exact problem here
If any one can help I will be appreciated
Thanks in Advance

That's caused by many probabilities like
1- IP is worong
2- Port is wrong
3- There is firewall prevent machine to go out and connect to another IP
4- SQL server down .
try to use
public class JdbcSQLServerDriverUrlExample
{
public static void main(String[] args)
{
Connection connection = null;
try
{
// the sql server driver string
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
// the sql server url
String url = "jdbc:microsoft:sqlserver://HOST:1433;DatabaseName=DATABASE";
// get the sql server database connection
connection = DriverManager.getConnection(url,"THE_USER", "THE_PASSWORD");
// now do whatever you want to do with the connection
// ...
}
catch (ClassNotFoundException e)
{
e.printStackTrace();
System.exit(1);
}
catch (SQLException e)
{
e.printStackTrace();
System.exit(2);
}
}
}
What i need to explain is there is very good technology called " Persistence " is better than JDBC and is more than brilliant and easy to use .

The problem is that your SQL server is either
not installed,
not running or
not accepting TCP/IP connections.
Particularly the last one is nasty, as I remember that some versions of SQL Server have not configured the TCP/IP connector to run by default.

Well first and foremost we need to see your code. Second looking at the error message the database is A)not running
B) on a different port
or C) the code is incorrect.

How to connect to a remote MySQL database with Java?

I am trying to create a JSF application using the Eclipse IDE. I am using a remote mySQL server as my database. How do I connect to this remote database for creating tables and accessing them?

Just supply the IP / hostname of the remote machine in your database connection string, instead of localhost. For example:
jdbc:mysql://192.168.15.25:3306/yourdatabase
Make sure there is no firewall blocking the access to port 3306
Also, make sure the user you are connecting with is allowed to connect from this particular hostname. For development environments it is safe to do this by 'username'#'%'. Check the user creation manual and the GRANT manual.

You need to pass IP/hostname of the rempote machine in the connection string.
import java.sql.*;
import javax.sql.*;
public class Connect
{
public static void main (String[] args)
{
Connection conn = null;
try
{
String url = "jdbc:mysql://localhost:3306/mydb";
Class.forName ("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection (url,"root"," ");
System.out.println ("Database connection established");
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
if (conn != null)
{
try
{
conn.close ();
System.out.println ("Database connection terminated");
}
catch (Exception e) { /* ignore close errors */ }
}
}
}
}

to access database from remote machine , you need to give grant all privileges to you data base.
run the following script to give permissions:
GRANT ALL PRIVILEGES ON . TO user#'%' IDENTIFIED BY 'password';

Plus, you should make sure the MySQL server's config (/etc/mysql/my.cnf, /etc/default/mysql on Debian) doesn't have "skip-networking" activated and is not binded exclusively to the loopback interface (127.0.0.1) but also to the interface/IP address you want connect to.

Create a new user in the schema ‘mysql’ (mysql.user)
Run this code in your mysql work space
“GRANT ALL ON . to user#'%'IDENTIFIED BY '';
Open the ‘3306’ port at the machine which is having the Data Base.
Control Panel ->
Windows Firewall ->
Advance Settings ->
Inbound Rules ->
New Rule ->
Port ->
Next ->
TCP & set port as 3306 ->
Next ->
Next ->
Next ->
Fill Name and Description ->
Finish ->
Try to check by a telnet msg on cmd including DB server's IP

Close all the connection which is open & connected to the server listen port, whatever it is from application or client side tool (navicat) or on running server (apache or weblogic). First close all connection then restart all tools MySQL,apache etc.

in my.cnf file , please change the following
## Instead of skip-networking the default is now to listen only on
## localhost which is more compatible and is not less secure.
## bind-address = 127.0.0.1

On Ubuntu, after creating localhost and '%' versions of the user, and granting appropriate access to database.tables for both, I had to comment out the 'bind-address' in /etc/mysql/mysql.conf.d/mysql.cnf and restart mysql as sudo.
bind-address = 127.0.0.1

Change the IP / hostname of the vps in your database connection string, instead of localhost. For example if my IP is 193.23.127.130:
jdbc:mysql://193.23.127.130:3306/yourdatabase
then make sure your vps firewall allow port 3306 for MySQL.
Then go to MySQL workbench, Server–Users and Privileges, create an account (in this case account: remoteUser, password:password), make sure Limit to Hosts Matching is % (means you can access from any other IP)
Then set password and grant rights then apply
then you can add the following code in Java to access remotely
Connection connection = DriverManager.getConnection("jdbc:mysql://193.23.127.130:3306/swing_demo", "remoteUser", "password");