I have meet one issue:
There is one database,it could be connected by sqldeveloper tools
But I want to use c3p0 to connect the database with the jdbcurl:
jdbc:oracle:thin:#2.2.6.11:2709:hl.webtest.com
get these error:
WARN - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask#55854763 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (5). Last acquisition attempt exception:
java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
why C3p0 throw the error? It seemed that the jdbcurl is wrong, what is correct jdbcurl with the Service Name?
jdbc:oracle:thin:#//2.2.6.11:2709/hl.webtest.com
it is use service_name, not the SID
You need the // and the /
Related
My application creates multiple (6-7) connections to the server. After about 5 minutes, 1 of the connections will be dropped. I can't really figure out why. Other than the aurora_fwd_master_idle_timeout that is set to 60, other configs remain at their default values. wait_timeout value, for example, defaults at 8 hours, so it should be long enough.
If I limit the multiple connections to 3-4, sometimes it work, sometimes it doesn't.
When it doesn't work, the detailed error is as follows:
MySql.Data.MySqlClient.MySqlException (0x80004005): Fatal error encountered during data read.
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Reading from the stream has failed.
---> System.IO.IOException: The read operation failed, see inner exception.
---> System.TimeoutException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
---> System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
Any ideas of what could possibly cause this?
when running
dotnet ef database update --startup-project ../webapi/webapi.WebAPI.csproj
on my MAC 10.13.5
I get this error -
System.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: TCP Provider, error: 35 - An internal exception was caught) ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. ---> System.EntryPointNotFoundException: Unable to find an entry point named 'AppleCryptoNative_SslCreateContext' in shared library 'System.Security.Cryptography.Native.Apple'.
at Interop.AppleCrypto.SslCreateContext(Int32 isServer)
at System.Net.SafeDeleteSslContext.CreateSslContext(SafeFreeSslCredentials credential, Boolean isServer)
at System.Net.SafeDeleteSslContext..ctor(SafeFreeSslCredentials credential, SslAuthenticationOptions sslAuthenticationOptions)
at System.Net.Security.SslStreamPal.HandshakeInternal(SafeFreeCredentials credential, SafeDeleteContext& context, SecurityBuffer inputBuffer, SecurityBuffer outputBuffer, SslAuthenticationOptions sslAuthenticationOptions)
--- End of inner exception stack trace ---
...
A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: TCP Provider, error: 35 - An internal exception was caught)
I originally thought this was my local docker database was not available but when connecting to new database instance it still occurs, this was working yesterday.
Whilst typing this I came across this, but thought would just add the answer as someone on a MAC EF Core install may miss that also when searching -
A connection was successfully established with the server, but then an error occurred during the pre-login handshake
Cleaning my project (I personally deleted all the folders) and rebuilding, sorted it!
I have followed every step in the tutorial: https://netbeans.org/kb/docs/web/mysql-webapp.html but the data source and connection pool are not displayed on the Server Resources node.
after completing all the other steps and deploying the project, i get the following error...
exception
javax.servlet.ServletException: javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: No suitable driver found for jdbc/IFPWAFCAD"
root cause
javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: No suitable driver found for jdbc/IFPWAFCAD"
I have Mysql DB connected to .NET MVC. When i connect remote it some times works fine and some times i have this error msg:
MySql.Data.MySqlClient.MySqlException (0x80004005): Authentication to
host 'ServerName' for user 'UserName' using method
'mysql_native_password' failed with message: Reading from the stream
has failed. ---> MySql.Data.MySqlClient.MySqlException (0x80004005):
Reading from the stream has failed. ---> System.IO.IOException: Unable
to read data from the transport connection: An established connection
was aborted by the software in your host machine. --->
System.Net.Sockets.SocketException: An established connection was
aborted by the
Please how can i make Authentication ? Any ideas to solve it?
This is a common error when some kind of deadlock occurs on the database more commonly a connection has been open a long time and gets shut down at the database end even though it is still in-use in your web application.
In my code, I used a suggestion from Microsoft, that retries the database command if it fails. The link is here: http://social.technet.microsoft.com/wiki/contents/articles/4235.retry-logic-for-transient-failures-in-windows-azure-sql-database.aspx Similar things exist for other non-Azure problems that use RetryPolicy.
What this means in a simple (Azure in my case) example is:
private static RetryPolicy<SqlAzureTransientErrorDetectionStrategy> retryPolicy = new RetryPolicy<SqlAzureTransientErrorDetectionStrategy>(new Incremental(3, TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1)));
// Inside your database function
retryPolicy.ExecuteAction(() =>
{
db.ExecuteStoredProc("procRecordMetric", cmd);
});
In my case, this was caused by ssl being enabled on the mysql server.
Here is a snippet from my.cnf
#ssl-ca = /etc/ssl/mysql/ca-cert.pem
#ssl-cert = /etc/ssl/mysql/server-cert.pem
#ssl-key = /etc/ssl/mysql/server-key.pem
Commenting these 3 lines fixed the issue for me.
Apache Tomcat 6.0.35 Hibernate Problem
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask#352e71c4 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(DriverManager.java:279)
The problem is rising with Ubuntu 12.04.2. What u need to do is to change hibernate library. I change it from v 4.1.2 to 4.1.9 and it is working fine.