2.2.1. I have started learning spring jpa data where I am using h2 database. Java's javax.sql.DataSource interface provides a standard method of working with database connections. In the below step, we have defined the JNDI name for our project. XML This file contains the user info regarding creating, modify and read users in AS ABAP system. Project Maven It is also possible to fine-tune implementation-specific settings by using their respective prefix (spring.datasource.hikari. In this article, we'll examine different scenarios in which this Spring Boot error comes up and what you can do to solve it. Now, let's see some common causes of this error and what you can do to solve this problem. How did knights who required glasses to see survive on the battlefield? Asking for help, clarification, or responding to other answers. but the ideal thing was to load it by myself in whenever I need it and with the parameter I define. @Bean When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. How do I get my Spring Boot API to return UTC times for MySQL Date values instead of "2018-08-01T04:00:00Z"? The user name is specified using the user property. It's what we do the training material. Strawberry Matcha (pictured), clean and tastes kind of a blend of korean strawberry milk and matcha! dsBuilder.password("mysql"); spring-boot-starter-data-jpa-- Start and end of artifactId tag. It is automatically trying to create an instance of DataSourceAutoConfiguration bean and it's failing. spring.datasource.driver-class-name = com.postgresql.jdbc.Driver Create datasource bean - In this step, we have created the datasource bean of the spring boot datasource configuration project. How do I get git to use the cli rather than some GUI application when asking for GPG password? Both the answers are appropriate for the question. Can anyone fill in the bean definition below? You can do that by adding some properties to the application.properties file with the spring.datasource prefix, as shown in the following example: This will provide the Spring Boot auto-configuration component to configure the database for you. Same Arabic phrase encoding into two different urls, why? 1) The first step that we need to take up is to create the spring boot application by using the spring initializer. For example, you have specified the following properties in the application.properties, Spring Boots configuration file but didn't include the corresponding MySQL JDBC driver into the classpath. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. I'm using tomcat. Is that really the username and password that the user set up? spring.datasource.username = postgres Is it possible to define a datasource using jdbc from xml files? I wanted to insert test data in it using org.springframework.beans.factory. Start Your Free Software Development Course, Web development, programming languages, Software testing & others. We are passing MySQL database URL, username and password as properties to the DataSource bean. We can also do it by creating JNDI in our project of spring boot datasource. Some of my friends get this error even if they don't need a database. Spring boot will automatically configure the connection pool by using apache tomcat, HikariCP, or by using common DBCP, we can choose it by using the classpath. The implementation is loosely coupled and if we want to switch . I just meant that I wasn't including it so I didn't confuse the issue. -- End of dependency tag. C# Programming, Conditional Constructs, Loops, Arrays, OOPS Concept, This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. We have barely scratched the surface of Spring Data JPA. 2. Can I connect a capacitor to a power source directly? That way you can make available your DataSource as spring bean. But just for an FYI if you're going to use DriverManagerDataSource as your datasource, every call to your datasource bean will create a new connection to your database which is not recommended for production and even it does not pool connections. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In the project, we can create a datasource bean by using DataSourceBuilder class, which was annotated by @configuration. *, and spring.datasource.dbcp2.*). If you need a connection pool, consider Apache Commons DBCP. Using application. Oh, and I mentioned presentation layer because your original post showed a servlet-context.xml. Its a point, but in my case I need (the user needs) to define it at run time. You may also have a look at the following articles to learn more . We can do this using the spring.datasource.jndi-name property. Not the answer you're looking for? Lastly, if you want to learn Spring Boot in depth, here are some useful resources for your learning: Master Java Web Services with Spring Boot, Master Hibernate and JPA with Spring Boot in 100 Steps. Ft. single family home built in 1964 that was last sold on 08/13/1980. Basically, the driver manager is used to obtain the standard object of connection which was used in the connection string. For example, we need to add MySQL-connector-java dependency for connecting to the MySQL database server, after adding spring boot starter data JPA dependency it will automatically add a mysql-connector-java dependency, we have no need to add it separately. How do the Void Aliens record knowledge without perceiving shapes? DataSourceBuilder dsBuilder = DataSourceBuilder.create(); @Bean is a method-level annotation and a direct analog of the XML <bean/> element. I've looked over the documentation to define a bean. Another thing you'll want to think about if you're using a Java EE app server is JNDI connection pool. In this step, we have configured the connection pooling for the project. In this quick tutorial, we'll learn several ways to configure a separate data source for testing in Spring. Spring boot offers ready-made auto configuration to use which can be further customized with advanced options in application.properties file. Sometimes, including incorrect Starter POM, can also solve this problem like addingspring-boot-starter-jdbcinstead ofspring-boot-starter-data-jpadependency. EDT: Right now you still have a password in plain text - a bad idea. The opinionated algorithm allows us to easily get a datasource configuration that was fully configured by default. Like other Spring Frameworks errors, the stack trace looks quite messy, something that they could have improved with Spring Boot, but here are these two errors I mentioned above. }. What if Some one want to use connection pooling? Somehow I doubt that. The general reason for this error is Spring Boot's auto-configuration, which is trying to automatically configure a DataSource for you but doesn't have enough information. Why don't chess engines take into account the time left by each player? We need to create datasource in our applicationin order to interact with database and perform database operations in Spring or Spring Boot applications. If we set spring.datasource.driver-class-name property then the mentioned driver class must be found and loaded. While using autowired spring boot will use primary datasource to use secondary datasource we need to use @Qualifier annotation. Connect and share knowledge within a single location that is structured and easy to search. In this step, we have run the project using the spring boot app. Declaring a bean spring.datasource.dbcp2.initial-size = 100 Was J.R.R. spring.jpa.database=mysql Data Source Configuration It is important to note that during the configuration of multiple data sources, one data source instance must be marked as the primary data source. Because now, it's defined in the .xml and depends on datasource. Dependencies spring data JPA We can also use spring boot datasource connection in connection pooling which was used in distributed transactions. Are softmax outputs of classifiers true probabilities? HikariCP, Tomcat Pooling and Commons DBCP2, Spring Boot Embedded Tomcat Configuration, Spring Boot HikariCP DataSource Configuration, Spring Boot2 @SpringBootApplication Auto Configuration, Spring Boot Remoting Spring RMI annotation example, The auto-configuration first tries to find and configure, If neither HikariCP nor the Tomcat Pooling datasource are available and if. See the original article here. We can configure multiple datasources, and we must mark as one of them @Primary. per @axtavt sugestion I'm goin with a proxy once with a Proxy implemented how do I cast it to the Original Bean? Making statements based on opinion; back them up with references or personal experience. If you are using Spring Boot and getting errors like "Cannot determine embedded database driver class for database type NONE" or "Error creating a bean with name 'dataSource' defined in class path resource DataSourceAutoConfiguration," then you have come to the right place. The recommended way is to use an established pool library. How to Define a MySql datasource bean via XML in Spring, "This is useful to allow the person deploying an application to customize environment-specific properties (for example database URLs, usernames and passwords), without the complexity or risk of modifying the main XML definition file or files for the container. What city/town layout would best be suited for combating isolation/atomization? This dependency brings all necessary dependencies including JDBC drivers for various databases e.g. dsBuilder.password ("postgres"); In the below step, we have provided project group name as com. Spring Boot is good at configuring in-memory databases like H2, HSQLDB, Derby, etc., and it can configure them just by adding their JAR files into the classpath, but for others, you need to give Spring Boot additional details like URL, DriverClass name, etc. HotSwappableTargetSource swapper = ctx.getBean (HotSwappableTargetSource.class); BasicDataSource ds = (BasicDataSource) swapper.getTarget (); Share Improve this answer Follow answered May 13, 2016 at 7:13 marioosh 26.3k 46 140 190 @Ruben: If you want to change it at runtime, then you need to create a proxy. This snippet creates a bean named. # PostgreSQL How can a retail investor check whether a cryptocurrency exchange is safe to use? dsBuilder.driverClassName ("com.postgresql.jdbc.Driver"); To define connection pooling by using datasource configuration spring boot is first verifying the available driver class. } CannotGetJdbcConnectionException: "Too many connections". No matter what, you'll have to bounce the server to get the changes, because Spring reads the app context on startup. Package name - com.example.springbootdatasourceconfiguration. This way, we can import the datasource configurations from even configuration provider systems. Group com. For complete details, see the Spring Data JPA reference . Since the factory is defined in the context will we not fall in the same problem? Spring Boot provides a very good support to create a DataSource for Database. As example - If you need a resource (in this case data source) named /jdbc/myds from JNDI then you can use the following configuration <beans> <jee:jndi-lookup id="myDataSource" jndi-name="java:comp/env/jdbc/myds"/> </beans> dsBuilder.url("jdbc:mysql://localhost/dataDB"); The scenario is that the user (administrator) comes to the application at the first time and I ask him the server, port and catalog to connect. public class datasourceConfig { * ) in application.properties file. To configure your own DataSource, define a @Bean of that type in your configuration. I would say that's the preferred way to do it. Name springbootdatasourceconfiguration example For instance, we could define some basic DataSource properties in our factory method: @Bean public DataSource getDataSource() { DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create (); dataSourceBuilder.username ( "SA" ); dataSourceBuilder.password ( "" ); return dataSourceBuilder.build (); } Copy Overall, very clean and new cafe with comfortable tables and chairs that have outlets . Spring Boot reuses your DataSource anywhere one is required, including database initialization. Published at DZone with permission of Javin Paul, DZone MVB. In this chapter, we are going to use Spring Boot JDBC driver connection . Add Spring Boot JDBC Dependency We are using JdbcTemplate to avoid common errors such as resource leak and remove JDBC boiler plate code. XML This file contains only UME users from the AS ABAP system. While autowiring the datasource, spring boot will prefer the primary datasource i.e., mySqlDataSource. This is a guide to Spring Boot Datasource Configuration. You can disable auto-configuration for certain classes by using the exclude attribute of the@EnableAutoConfiguration annotation of Spring Boot, as shown below: You can even exclude more than one classes using exclude attribute with @EnableAutoConfiguration as shown below: That's all for today onhow to solve the"Cannot determine embedded database driver class for database type NONE" or "Error creating a bean with name 'dataSource' defined in class path resourceDataSourceAutoConfiguration" problem. will throw a java.lang.ClassCastException: $Proxy4 cannot be cast to org.apache.commons.dbcp.BasicDataSource. Here we specify the DataSource implementation class as the OracleDataSource. I will never know where the user wants to connect to. You can create a factory to produce a DataSource like you want: You can externalize the database connection properties: Now Spring will get them from a .properties file that is loaded on startup. In this step, we have created the datasource bean of the spring boot datasource configuration project. Stack Overflow for Teams is moving to its own domain! rev2022.11.15.43034. Recommend the Big Island Latte if you like coconut flavors! Yes the propeties file is not the point but where can you see the presentation layer in my answer and i believe using. @Ruben: No, you shouldn't. For example, some of them includedspring-boot-starter-data-jpa, which then includedhibernate-entitymanager.jar, and they didn't have additional things need to set that up. Why would an Airbnb host ask me to cancel my request to book their Airbnb, instead of declining that request themselves? spring.datasource.url = jdbc:postgresql://localhost:5432/datasource spring.datasource.jndi-name = java:jboss/datasources/datasource. @Primary Artifact name springbootdatasourceconfiguration 500 North Walnut Street, La Habra, California 90631 Phone 562.690.2305 | Fax 562.690.4154 A datasource uses a URL along with username/password credentials to establish the database connection. Spring boot datasource uses the database credential to set up connections between the database server, it is alternative to the facility of Driver Manager. Note that it is upper case in this implementation while it is lower case in most other DataSource implementations. { @Bean(name = "myDataSource") La Habra City School District. @Bean @ConfigurationProperties("spring.datasource.bank") public DataSourceProperties cardDataSourceProperties() { return new DataSourceProperties(); } Then create the datasouce using DatasourceProperties method which we have written earlier as below, @Bean @ConfigurationProperties("spring.datasource.bank.configuration") For a pooling datasource to be created, Spring boot verifies that a valid Driver class is available. Stack Overflow for Teams is moving to its own domain! Code - @Configuration public class datasourceConfig { @Bean public DataSource getDataSource () { Set the SQL Dialect to "default" in your application.properties to let Spring autodetect the different SQL Dialects of each datasource spring.jpa.database=default 3. If you want to learn more about how auto-configuration works in Spring Boot, I suggest you go through a comprehensive Spring Boot course likeSpring Boot: Efficient Development, Configuration, and Deploymenton Pluralsight, which will also teach you the details behind@EnableAutoConfiguration by writing your own auto configurations. After generating the project by using spring initializer in this step we are extracting the jar file and opening the project by using the spring tool suite. URI to retrieve the list of Employee will be https:// {host}: {port}/SpringDataSource/rest/emps Sometimes, you do need a database but you forgot to include the driver JAR file into the classpath, which can also cause this error. dsBuilder.username ("postgres"); Overview. We often do not need to specify the driver-class-name, since Spring Boot can deduce it for the most databases from the connection url. Spring boot provides straightforward ways to create datasource beans - either using properties configuration or using java configuration. @Configuration That file contains the difference only in upgrade compatibility. To get rid of java.lang.ClassCastException You can get dataSource from HotSwappableTargetSource bean like below. I'm just unclear on what class file to use for a Mysql database. Javaspring bean5. @duffymo could you please explain where the name of the property file is configured. What does 'levee' mean in the Three Musketeers? spring-boot-starter-data-jpa starter automatically get a dependency to HikariCP. We have created the class name as datasourceConfig. 'Trivial' lower bounds for pattern complexity of aperiodic subshifts. return (DataSource) dsBuilder.build(); this way I should create EntityManger from a factory as well right? If you liked my explanation and solution of this Spring Boot error, then please share with your friends and colleagues. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); HowToDoInJava provides tutorials and how-to guides on Java and related technologies. dsBuilder.url ("jdbc:postgresql://localhost:5432/datasource"); org.springframework.boot -- Start and end of groupId tag. Below are the other configuration files for the application server are as follows. especially for admission & funding? In that case, I suggest you go through a comprehensive Spring Boot course likeLearn Spring Boot by Dan Vega on Udemy. To configure spring boot datasource configuration we are using the dataSourceConfiguration_r3_roles_db.xml, this is only the configuration option available to configure the data source. ParametricPlot for phase field error (case: Predator-Prey Model), Elemental Novel where boy discovers he can talk to the 4 different elements. I would like to make a "First Access Database Setup Process" in my spring application and the only thing I can imagine as a solution would be to initialize the DataSource bean programatically. The password is specified using the password property. It also shares the best practices, algorithms & solutions, and frequently asked interview questions. Using regular expressions in Spring bean value. If you need to externalize some settings, you can bind your DataSource to the environment (see " Section 24.8.1, "Third-party Configuration" "). Is it possible to stretch your triceps without stopping or riding hands-free? Note: All entities defined in a Service Builder module's service.xml file are bound to the same data source. DataSource configuration is provided by configuration properties entries ( spring.datasource. Can we consider the Stack Exchange Q & A process to be research? While adding spring boot starter data JPA dependency (spring-boot-starter-data-jpa) it will add all the dependencies including all databases jdbc driver. To configure your own DataSource, define a @Bean of that type in your configuration. Below given configuration shows sample properties for H2, MySQL, Oracle and SQL Server databases. Java org.springframework.beans.factory.BeanCreationException,java,mysql,spring-mvc,datasource,jdbctemplate,Java,Mysql,Spring . Thanks for contributing an answer to Stack Overflow! The annotation supports most of the attributes offered by <bean/>, such as: init-method , destroy-method , autowiring , lazy-init , dependency-check , depends-on and scope . Eclipse Virgo Injected JPA EntityManager does not connect to Database, com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Exception during pool initialization: springHikariCP - Connection is not available, Datasource multiple database in mysql in java, How to configure port for a Spring Boot application, How can I setting datasource in Spring application. A DataSource is a factory for connections to the physical databases. You'll have the JNDI name externalized, and the connection parameters are managed by the admin of the app server. Just adding the dependencies and doing the configuration details is enough to create a DataSource and connect the Database. We can also use spring boot datasource connection in connection pooling. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. In this tutorial we will see how to create Datasource in Spring Boot application in different ways. Elemental Novel where boy discovers he can talk to the 4 different elements. You can do that by adding some properties to the application.properties file with the spring.datasource prefix, as shown in the following example: 6 1 spring.datasource.url =. We have provided the external configuration by using the application.properties file. Opinions expressed by DZone contributors are their own. Spring boot 2.6.0 Given is an example bean for H2 DB. Spring boot will use the algorithm name as opinionated to configure and scam the datasource configuration of spring boot. @Component public class DatasourceProxyBeanPostProcessor implements BeanPostProcessor { @Override Spring Boot Error: Creating a Bean With 'DataSource' Defined in DataSourceAutoConfiguration, Spring Boot: Efficient Development, Configuration, and Deployment, How Web 3.0 Is Steering the Future of DevOps Tools, Complete Guide to Open Source Licenses for Developers, 5 Spring Boot Features Every Java Developer Should Know (, Top 5 Free Courses to learn Spring and Spring Boot in 2019 (, 5 Course to Master Spring Boot online in 2019 (, 10 Things Java Developer should learn in 2019 (, 10 Tools Java Developers use in their day-to-day life (, 10 Tips to become a better Java developer in 2019 (, 3 Best Practices Java Programmers can learn from Spring (, Top 5 Spring Boot Annotations Java Developers should know (, 5 books to learn Spring Boot and Spring Cloud (, 5 courses to learn Spring Boot in depth (. Also, the use of property files is being replaced by using environment variables. Where initialSize and maxActive are pooling related properties. http://docs.spring.io/spring-data/jdbc/docs/1.1.0.M1/reference/html/orcl.datasource.html. Why do we equate a mathematical object with what denotes it? Other Java and Spring Boot articles you may like: Thanks for reading this article! To use this make sure you have the required jar in your path. Spring boot provides straightforward ways to create datasource beans either using properties configuration or using java configuration. In Java, a datasource implements the javax.sql.DataSource interface. Steps to Create DataSource in Spring Boot Application Add Spring Boot JDBC dependency in POM .xml Add datasource information in application.properties Get JDBCTemplate object in your DAO with @ Autowired annotation and use it there is no point 4, that't it 1. Not the answer you're looking for? THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS. By signing up, you agree to our Terms of Use and Privacy Policy. All the classes in Spring JDBC are divided into four separate packages: core the core functionality of JDBC. London Airport strikes from November 18 to November 21 2022, Change number of default segments in buffer tool. Here are the steps: Specify your database and a data source name in your service.xml. Again dataSource bean is set to the EmployeeDAOImpl bean and we are ready with our Spring JDBC implementation. Create the database manually. Making statements based on opinion; back them up with references or personal experience. Here we discuss the definition, overviews, Two Test Configuration additional examples with code implementation. Define the data source. found this: it's more about a swapable datasource using a proxy. Here we can simply check whether the bean instance is a DataSource and if yes, we can simply wire in our custom proxy DataSource object. Some of the important classes under this package include JdbcTemplate, SimpleJdbcInsert, SimpleJdbcCall and NamedParameterJdbcTemplate. Using this file we can only create and modify new users in the local java database. Steps To configure custom DataSource, you have to define a bean of that type in your configuration. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It's the Spring PropertyPlaceholderConfigurer: static.springsource.org/spring/docs/2.0.x/api/org/, static.springsource.org/spring/docs/2.5.x/api/org/, Speeding software innovation with low-code/no-code tools, Tips and tricks for succeeding as a developer emigrating to Japan (Ep. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Remember that if we create our own DataSource, the auto-configuration backs off. In the below example the properties are stored as key-value pairs and we access the value using the corresponding key. 505), PropertyPlaceholderConfigurer vs Filters -- Spring Beans, how to make connection pool in spring application using BasicDataSource, AnnotationConfigApplicationContext and parent context, Java Standalone (Console) Application - org.hibernate.LazyInitializationException: could not initialize proxy - no Session, How can I stop MySQL from running out of connections when using Spring Boot Live Reload? Now we will see one example of what needs to be configured while using the multiple data sources for our spring boot application let's get started. We can do this either manually, or if using Spring Boot, through standard application properties. Spring Boot auto-configuration is triggered by JAR dependencies present in the classpath, and if it pulls something you don't need, then this type of error can occur. The primary datasource is autowired by default, and other datasources need to be autowired along with @Qualifier annotation. Thanks @axtavt, but the app will create it on startup. Data source auto-configuration is checking for the class of data source or classpath which was configured by the data source bean. Using environment variables comes from the 12 Factors of Cloud Development. 2022 - EDUCBA. @configuration @componentscan ("com.packagename.webstore") public class rootapplicationcontextconfig { @bean public datasource datasource () { // this is the original code of the example /*embeddeddatabasebuilder builder = new embeddeddatabasebuilder (); embeddeddatabase db = builder .settype (embeddeddatabasetype.hsql) .addscript Go to the below URL and fill in all the required details and generate. spring.datasource.dbcp2.max-idle = 100 2. The datasource points to a class that implements it, that could for example be a pooling wrapper around the JDBC driver. ALL RIGHTS RESERVED. The main reason they were getting this error was because of a starter dependency. You'll have to know something. To configure multiple data sources, create as many bean definitions as you want but mark one of the DataSource instances as @Primary. Failed radiated emissions test on USB cable - USB module hardware and firmware improvements. Please help us improve Stack Overflow. Run Service Builder. See sales history and home details for 1231 Spring Meadow Ln, La Habra, CA 90631, a 4 bed, 2 bath, 1,593 Sq. Why do we equate a mathematical object with what denotes it? * . Give us a call now to schedule your tour. A Spring bean must be created to define the datasource and the referenced from the database connector. After we have the class, we can simply register this class as a bean into the container. We specify the URL using the URL property. To learn more, see our tips on writing great answers. Create a Spring bean that points to the data source. Tolkien a fan of the original Star Trek series? Sometimes, excludingDataSourceAutoConfigutioncan also solve this problem, especially if you don't need a database. Can we connect two of the same plural nouns with a preposition? To learn more, see our tips on writing great answers. 3.1. For example c3p0 or Apache DBCP, since they are both mature . How do magic items work when used by an Avatar of a God? Then we can create the data sources by using the DataSourceProperties objects: @Bean public DataSource todosDataSource() { return todosDataSourceProperties () .initializeDataSourceBuilder () .build (); } @Bean public DataSource topicsDataSource() { return topicsDataSourceProperties () .initializeDataSourceBuilder () .build (); } Copy 4. As we already know that we can register a data source object using an application property file; let's look at the syntax of how we can do this in spring boot. The file dataSourceConfiguration_r3_roles_db.xml is equivalent to the dataSourceConfiguration_r3_roles_db.xml file. Also, why are you declaring your infrastructure beans in your presentation layer? Configuring a data source in Spring requires defining a bean of type DataSource. The recommended way to create a DataSource bean is using DataSourceBuilder class within a class annotated with the @Configuration annotation. Was J.R.R. return (DataSource) dsBuilder.build (); Chaggacino was also a new experience, very earthy mocha kind of flavor! 11 reviews of Rabbit & Bean Coffee Bar "Great new cafe out on Imperial! ", Speeding software innovation with low-code/no-code tools, Tips and tricks for succeeding as a developer emigrating to Japan (Ep. Design review request for 200amp meter upgrade. Spring Boot reuses your DataSource anywhere one is required, including database initialization. Tolkien a fan of the original Star Trek series? Connect and share knowledge within a single location that is structured and easy to search. Find centralized, trusted content and collaborate around the technologies you use most. { Over 2 million developers have joined DZone. Join the DZone community and get the full member experience. Why did The Bahamas vote in favour of Russia on the UN resolution for Ukraine reparations? I store it in a embeeded db and next time application start, a bean can check if the parameter are set on the embedded db and load it again. -- Start of dependency tag. And can we refer to it on our cv/resume, etc. This class provides the basic implementation of DataSource that we can use. This datasource will typically be registered with the JNDI service and can be discovered using its JNDI name. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. This will prevent Spring Boot from automatically configuring the database and there won't be any errors. This means that the application has a DataSourceConfig class that is hosting bean factories responsible for dispensing both DataSource and JdbcTemplate objects. In most cases, it is because auto-configuration doesn't have enough details required to configure the database, but sometimes, it's also the accidental trigger of database auto-configuration, which can be disabled using the exclude attribute of@EnableAutoConfigurationannotation.

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