I have encountered a problem when setting up a Data Source in Oracle WebLogic Server that is an AS400. When setting it up and testing the connection I get the error message:
"The application requester cannot establish the connection"
When checking on IBMs website I found the following:
What does "The application requester cannot establish the connection"
mean?
The Toolbox JDBC driver uses the system name, user ID, and password
provided in the call to DriverManager.getConnection() to establish a
connection to the IBM i database. If any of these are not provided,
the Toolbox JDBC driver will display a sign-on prompt. If the Toolbox
JDBC driver can not sign on to the system for any reason, it will
throw an SQLException with the message "The application requester
cannot establish the connection". Here is a list of potential causes
for this exception: The system name is incorrect. One way to verify
this is to use ping with the specified system name. If ping fails,
then there is a TCP/IP configuration problem between your client and
the system. The user ID or password is incorrect. The IBM i database
host server is not started. You can start this by running STRHOSTSVR
*DATABASE on the IBM i command line. You can verify if the IBM i database host server is running
using the utilities.JPing application.
(http://www-03.ibm.com/systems/power/software/i/toolbox/faq/jdbc.html#faqC6)
When I ping the server, it fails - which also makes sense. However, when I use just a plain java file that opens a connection, fires an sql and closes the connection like
connection1 = DriverManager.getConnection("server", "user", "password")
Statement statement1 = connection1.createStatement();
ResultSet result1 = statement1.executeQuery("SQLquery")
i get a perfect connection and correct result. How is this possible? How can I connect via WebLogic and ODI?
PS: I already installed the AS400 driver according to this manual
Related
We have a java project in an Azure virtual machine (VM), and need connect to Azure SQL db by JDBC connection, so we use the JDBC connection string provided by Azure SQL db as follows:
"jdbc:sqlserver://ZZZdbserver.database.windows.net:1433;database=ZZZ;user=*****;password=*****;encrypt=true;trustServerCertificate=false;hostNameInCertificate=*.database.windows.net;loginTimeout=30;"
but we got an exception:
"java.security.cert.CertificateException: Failed to validate the server name in a certificate during Secure Sockets Layer (SSL) initialization.
The server name is *.database.windows.net, the name in certificate is cr2.eastus1-a.control.database.windows.net."
then we updated the JDBC connection string to:
"jdbc:sqlserver://ZZZdbserver.database.windows.net:1433;database=ZZZ;user=*****;password=*****;encrypt=true;trustServerCertificate=false;hostNameInCertificate=cr2.eastus1-a.control.database.windows.net;loginTimeout=30;"
but we got another exception:
org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Cannot open server "ZZZ1" requested by the login. The login failed.)
where "ZZZ1" is our username for the Azure VM.
Any idea to solve this issue?
By default, Azure VM has not blocked the outbound connection to the Internet. You could first verify the network connectivity from your VM to the Azure SQL database via running the command telnet ZZZdbserver.database.windows.net 1433 in CMD or Test-NetConnection -computer ZZZdbserver.database.windows.net -port 1433 in Powershell. If it fails, you may check if there is any firewall blocking this database connection or port or your application is listening on that port or your SQL database is online.
Additionally, if the network connectivity has succeeded, you could verify if the username or password is correct when you are using to connect to your database. Make sure there is not any typo. Also, the username should have enough privileges to access this database. You can try to access this database via Server admin login in the properties of the SQL database. Moreover, you could refer to this sample code to use Java to connect to access the Azure SQL database.
When using the Microsoft JDBC Driver for SQL Server to connect to an Azure SQL Database. You should note this:
Appending the server name to the userId in the connection string
Prior to the 4.0 version of the Microsoft JDBC Driver for SQL Server,
when connecting to an Azure SQL Database, you were required to append
the server name to the UserId in the connection string. For example,
user#servername. Beginning in version 4.0 of the Microsoft JDBC Driver
for SQL Server, it's no longer necessary to append #servername to the
UserId in the connection string.
Using encryption requires setting hostNameInCertificate
Prior to the 7.2 version of the Microsoft JDBC Driver for SQL Server,
when connecting to an Azure SQL Database, you should specify
hostNameInCertificate if you specify encrypt=true (If the server name
in the connection string is shortName.domainName, set the
hostNameInCertificate property to *.domainName.). This property is
optional as of version 7.2 of the driver.
Hope this helps.
If I need set encrypt=true, and hostNameInCertificate=cr2.eastus1-a.control.database.windows.net. Where do I need get the certificate for cr2.eastus1-a.control.database.windows.net from Azure SQL DB's service?
I am trying to connect to H2 Server started on the same machine using java. I started the H2 server in mixed mode. While connecting to the server I am getting Error.
The code to start the server is:
Server.createTcpServer("-tcp", "-tcpAllowOthers", "-tcpSSL").start();
The code to connect to the server is:
Class.forName("org.h2.Driver");
Connection conn = DriverManager.getConnection("jdbc:h2:tcp://127.0.0.1/~/Data/test", "", "");
The Error is:
Connection is broken: "unexpected status 352518912" [90067-197]
Anybody please help me with this. I am stuck at this for two days.
You need to use ssl protocol instead of tcp in the URL, because you use an encrypted socked on the server.
"jdbc:h2:ssl://127.0.0.1/~/Data/test"
Please also note that database cannot be created remotely by default in recent versions of H2 due to security reasons. You need to create the database on the server side with a local url such as "jdbc:h2:~/Data/test", it's enough to open and close a connection to it.
Also I hope that empty password is only for that example code in the question. If you have a database that has an user with ADMIN privileges (username and password from the first connection that creates the database are used to create such user) and an empty or weak password (or if you enable the remote database creation), anyone, who can connect to that port, will get full access to your server process and this process most likely already has the same access to your system as you, so you effectively create a remote security hole with -tcpAllowOthers and such passwords.
When I try to connect java application to oracle db using jdbc thin client, my system name was sent to db server without host name (eg. 102XXXXX) But when I try with oracle client(PL/SQL developer), my system name was sent to db server with domain name appended (eg. North_America/102XXXXX). And in oracle server, my machine is whitelisted with domain name (eg. North_America/102XXXXX). So I got account locked exception when try to run the java application but have successful connection from PL/SQL developer. I am not sure how to solve this issue from my side. I need both connection. Anyone has any idea?
Note that you can also customize what the Oracle JDBC thin driver sends for the system name during authentication by setting this property "v$session.machine".
I have a local MS SQL Server and I am trying to connect to it using JTDS in java. Here is the connection string:
Class.forName("net.sourceforge.jtds.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:jtds:sqlserver://localhost:1433/stock","sa","password");
And the server properties:
name: USER-PC\SQLEXPRESS
root directory: c:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL
I am getting a Exception in thread "main" java.sql.SQLException: Network error IOException: Connection refused: connect error.
How can I remedy this?
Check the following:
You have enabled mixed mode security, i.e. so you can connect with username/password (rather than using Windows authentication)
The TCP/IP protocol is enabled. Open SQL Server Configuration Manager, then in SQL Server Network config select Protocols and Enable TCP/IP.
Try passing just one String to getConnection using this format:
DriverManager.getConnection("jdbc:jtds:sqlserver://localhost:1433/stock;instance=SQLEXPRESS;user=sa;password=password")
If you are using this format (naming the instance) then the SQL Server Browser service needs to be running (in Services). If this is greyed out then the Service is probably disabled, so enable it and then start it.
Port 1433 is the port used by the default instance. You're using SQLEXPRESS, which is a named instance. Your connection string should include something like:
sqlserver://localhost\SQLEXPRESS
SQL Server Browser service is disable by default. If you're developing .Net app, you do not need to start SQLBrowser, but if you're using JTDS in java, you will need it started.
I have a java program that connects to a MS SQL database. The program works perfectly when running through eclipse however I get an error when I run it through AIX:
java.sql.SQLException: Network error IOException: A remote host refused an attempted connect operation.
I can successfully ping the server but am not able to telnet into the server. I am also not able to telnet from my windows desktop.
I am using jtds to connect:
String connectionString = "jdbc:jtds:sqlserver://"+dropez_ip_address+"/"+dropez_db_name;
ResultSet rs = null;
Statement stmt = null;
try{
Class.forName("net.sourceforge.jtds.jdbc.Driver");
Connection conn = DriverManager.getConnection(connectionString, dropez_db_username, dropez_db_password);
stmt = conn.createStatement();
}catch(Exception e){}
Here is some documentation from jTDS regarding the issue, but I am still not able to resolve the issue.
Why do I get java.sql.SQLException: "Network error IOException: Connection refused: connect" when trying to get a connection?
The "Connection refused" exception is thrown by jTDS when it is unable to connect to the server. There may be a number of reasons why this could happen:
- The server name is misspelled or the port number is incorrect.
- SQL Server is not configured to use TCP/IP. Either enable TCP/IP from SQL Server's Network Utility app or have jTDS connect via named pipes (see the URL format for information on how to do this).
- There is a firewall blocking port 1433 on the server.
To check whether TCP/IP is enabled and the port is not blocked you can use "telnet 1433". Until telnet doesn't connect, jTDS won't either. If you can't figure out why, ask your network administrator for help.
If you can't telnet on port 1433, you are blocked by a firewall somewhere in the middle between your machine and the server. That's not a java related problem.
May it be that when you say "it runs perfectly under eclipse but not AIX" you are taking about 2 different computers ? If so, the one with eclipse is not firewalled, the one where you deploy your app is blocked.
But again, nothing to do with java. It's a level 3 error (TCP layer) of TCP-IP model.
Regards,
Stéphane
Your SQL Server database probably doesn't have the TCP/IP protocol enabled, to enable it:
From the Microsoft SQL Server 2005 -> Configuration Tools, open the 'Microsoft SQL Server Configuration Manager'.
Expand ‘SQL Server 2005 Network Configuration’, and then click ‘Protocols for ’.
Right-click ‘TCP/IP’ and then click ‘Enable’. The icon for the protocol will change to show that the protocol is enabled.
For SQL Server 2008: