How to establish a connection pool in JDBC? - Stack Overflow
Can anybody provide examples or links on how to establish a JDBC connection pool? From searching google I see many different ways of doing this and it is rather confusing. Ultimately I …
Connect Java to a MySQL database - Stack Overflow
The better practice is to install the physical JDBC driver JAR file in the server itself and configure the server to create a JDBC connection pool. Here's an example for Tomcat: How should I …
URL string format for connecting to Oracle database with JDBC
Jun 28, 2009 · I highly recommend to use the new format! The old format connects to one specific database instance and one specific database instance only. If you chose to create a database …
Spring boot Unable to acquire JDBC Connection - Stack Overflow
Mar 29, 2023 · 20 connections for 500 users is probably to low. I would also decrease the connection timeout (you don't want to wait 50seconds before you get an error). If you don't get …
I'm getting Unable to acquire JDBC Connection exception
Nov 8, 2018 · I'm running a spring-boot application with hibernate and spring-data. I I have the following method: @Service class SomeService(private val repository : SomeRepository){ fun …
java - What is a Connection in JDBC? - Stack Overflow
May 8, 2009 · What is a Connection Object in JDBC ? How is this Connection maintained(I mean is it a Network connection) ? Are they TCP/IP Connections ? Why is it a costly operation to …
What is the MySQL JDBC driver connection string?
Sep 22, 2009 · I am new to JDBC and I am trying to make a connection to a MySQL database. I am using Connector/J driver, but I cant find the JDBC connection string for my …
How to debug/fix error: TransactionException: Unable to rollback ...
Jul 12, 2021 · But when I run the same code on a new machine, MacOS Big Sur, Apache Tomcat 8.5.43, MySQL 8.0.25, I've started getting TransactionException: Unable to rollback against …
Java JDBC - How to connect to Oracle using tnsnames.ora
Jan 7, 2013 · You can take the entry directly from the tnsnames.ora file and attach it to the jdbc driver string as following: Example from using odbc7.jar (Oracle 12c JDBC driver for JDK 7) to …
java - Could not open JPA EntityManager for transaction;nested ...
Oct 5, 2022 · Could not open JPA EntityManager for transaction;nested exception is org.hibernate.exception.JDBCConnectionException:Unable to acquire JDBC Connection …