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com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:

I'm trying to connect my java application to mysql workbench. all the details in connection string, username and password are correct, even though the connection is not getting established
and throwing the error
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
From the coverage I came to know that the connection statement is not executing, but I don't know why?
could you please explain me what went wrong. please and thanks.

Maybe because you specified MySQL in the JDBC URL instead of mysql (notice the case difference).
You should also close the result set, statement and connection at the end.

To connect workbench to a database, first you must have a running sql server. So first of all make sure you have a running server. Then loose the "?autoReconnect=ture&useSSL=false" part in your database connection URL and try it again.

I was having the same problem and I suffered for more than 3-4 hours with it, and finally one of my senior suggested me to check the version of my SQLconnector and SQL Workspace's version.
Then I found that it was because of the mismatch of both of them. Please check this thing first, and still if it doesn't work, then use the below query.
?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=CONVERT_TO_NULL&serverTimezone=GMT
add this after your URL as it is a Master Quick Fix.

Java, MySql -- connecting from another computer

I created a java program that uses MySql. Now I want to give the app to someone else, and I'm using the URL as: jdbc:mysql://ipAddress:3306/tableName, but it doesn't work, showing the error of connection failure.
What should I do?

It's a troubleshooting stuff, do the following.
Check the Firewall and Port access on MySQL Server computer.
Check the MySQL Service and the DB User is doing good.
Follow the following thread
How to allow remote connection to mysql

Trying to connect sql database which is on host

I'm having trouble with trying to connect sql database which is staying in a host machine. I know host machine's ip,password etc etc I can use this host maching as my computer. So here's my problem starting. Normally my database stands at my C:/ folder like "x.sqlite" I did this database with mozilla plugin which named SQLite Manager. Here's my code for connecting to database.
Class.forName("org.sqlite.JDBC");
Connection conn =DriverManager.getConnection("jdbc:sqlite:C:\\x.sqlite");
But i need to connect first host machine and show the sqlite file as that code which i gave before that. If you need something, just leave a comment or if you have any answers , feel fre e to share with me please , thanks ^^

SQLite is not designed for use over a network. If the remote database is available as a network share or NFS mount you might be able to use it, but that is likely to cause data corruption if the connection goes down or has temporary glitches.

IO Error: The Network Adapter could not establish the connection

I am new to Oracle, and am trying to run a simple example code with Java, but am getting this error when executing the code.. I am able to start up the listener via CMD and am also able to run SQL Plus. Can anyone give me a hand and tell me what I might be doing wrong?
Update:
I am using JDBC.
Database is local, and I actually had it working but it stopped working just today. I'm not really sure why though. Would you mind giving me some procedures to follow by since I don't know much.

Either:
The database isn't running
You got the URL wrong
There is a firewall in the way.
(This strange error message is produced by Oracle's JDBC driver when it can't connect to the database server. 'Network adapter' appears to refer to some component of their code, which isn't very useful. Real network adapters (NICs) don't establish connections at all: TCP protocol stacks do that. It would have been a lot more useful if they had just let the original ConnectException be thrown, or at least used its error message and let it appear in the stack trace.)

I had the same problem, and this is how I fixed it.
I was using the wrong port for my connection.
private final String DB_URL = "jdbc:oracle:thin:#localhost:1521:orcll"; // 1521 my wrong port
go to your localhost
(my localhost address) : https://localhost:1158/em
login
user name
password
connect as --> normal
Below 'General' click on LISTENER_localhost
look at you port number
Net Address (ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1522))
Connect to port 1522
Edit you connection
change port 1521 to 1522.
done

Another thing you might want to check that the listener.ora file matches the way you are trying to connect to the DB. If you were connecting via a localhost reference and your listener.ora file got changed from:
HOST = localhost
to
HOST = 192.168.XX.XX
then this can cause the error that you had unless you update your hosts file to accommodate for this. Someone might have made this change to allow for remote connections to the DB from other machines.

I figured out that in my case, my database was in different subnet than the subnet from where i was trying to access the db.

I had this error when i renamed the pc in the windows-properties. The pc-name must be updated in the listener.ora-file

Most probably you have listener configured wrongly, the hostname you specify in connection string must be the same as in the listener.
First check the Firewall and network related issues.
Check if Oracle Listener service is available and running. If not you may use Oracle Net Configuration Assistant tool to add and register new listener.
If the above steps are ok then you need to configure Oracle Listener appropriately. You may use Oracle Net Manager tool or edit “%ORACLE_HOME%\network\admin\listener.ora” file manually.
There are 2 options that need to be considered carefully:
Listening Locations associated with the Listener – Hostname(IP) and Port in Listening Location must exactly match the ones used in the connection string.
For example, if you use 192.168.74.139 as target hostname, then there must be Listening Location registered with the same IP address.
Also make sure the you use the same SID as indicated in Database Service associated with the Listener.
https://adhoctuts.com/fix-oracle-io-error-the-network-adapter-could-not-establish-the-connection-error/

IO Error: The Network Adapter could not establish the connection (CONNECTION_ID=iKQM6lBbSLiArrYuDqud8A==)
if you are facing this issue
1- make sure you have downloaded oracle databases like oracle 11g,19c, 21c, or any latest databases.
2- search for services in your computer or type win+r then services.mis then search for oracleservice you will find orcl or xe or any other sid like oracleserviceorcl;
after that you can test your connection using sql developer, sql plus or cmd

To resolve the Network Adapter Error I had to remove the - in the name of the computer name.

In my case, I needed to specify a viahost and viauser. Worth trying if you're in a complex system. :)

For me the basic oracle only was not installed. Please ensure you have oracle installed and then try checking host and port.

I was having issues with this as well. I was using the jdbc connection string to connect to the database. The hostname was incorrectly configured in the string. I am using Mac, and the same string was being used on Windows machines without an issue. On my connection string, I had to make sure that I had the full url with the appending "organizationname.com" to the end of the hostname.
Hope this helps.

Just try to re-create connection. In my situation one of jdbc connection stopped working for no reason. From console sqlplus was working ok.
It took me 2 hours to realize that If i create the same connection - it works.

How do I get started using JDBC and SQL Server 2008 R2?

I've been googling this for the last 3 hours, and I've had no luck. I'm trying to connect to a SQL Server 2008 with Java, which I normally access with SQL Management Studio. It's windows authenticated too, so it's not like I enter a username or password.
The two relevent lines of code:
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn = DriverManager.getConnection(db_connect_string, db_userid, db_password);
What I want to know is:
What am I supposed to put in for Class.forName? I just downloaded the latest JDBC. Yes I've looked around. Most sites tell me what it is, and why I need to set it, rather than what I need to set.
Where do I define a class path, and what do I define it as? I've googled this, and I can't find anything that tells me WHERE I set this.
Since it's a windows authenticated system, what do I use for db_connect_string, db_userid, and db_password? I'm assuming db_connect_string is localhost, right (if it's a local database)?
I'm not very well versed with any of this, so an explanation would be really appreciated!

The Microsoft JDBC driver supports Windows authentication for clients on Windows platforms. Beginning with the 4.0 release, we also offer pure Java Kerberos authentication regardless of platforms. You can find more details on Kerberos here - http://msdn.microsoft.com/en-us/library/gg558122.aspx and setting connection properties here - http://msdn.microsoft.com/en-us/library/ms378988.aspx
Our online help in general provides guidelines for building your connection url and making connections to SQL Server.

Actually, you can use JDBC (as well as jTDS) to connect to SQL Server from Java with Windows authentication. Please take a look here. Hope it helps!