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module not found error: no module named 'mysql'

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June 30, 2021

put the jar file in the project's library folder.

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Access to XMLHttpRequest at 'http://localhost:8081/api/v1/employees' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

July 27, 2021

Fix : Add the add cross controller to springboot controller class Ex : @CrossOrigin (origins = "http://localhost:3000/" )

"status": 404, "error": "not found", "message": "no message available", "path": "/api/employee"

July 16, 2021

first, make sure the YourController.java file that has the @Controller and the YourSpringBootFile.java file that has the @SpringBootApplication are in the same package. If you want your controller to be in a different package outside of YourSpringBootFile.java's package, then follow these instructions = Spring: Run multiple "SpringApplication.Run()" in application main method There are 2 methods to overcome this Place the bootup application at the start of the package structure and rest all controllers inside it. Example : package com.spring.boot.app; - You bootup application(i.e. Main Method -SpringApplication.run(App.class, args);) You Rest Controller in with the same package structure Example: package com.spring.boot.app.rest; Explicitly define the Controller in the Bootup package. Method 1 is more cleaner. referred to: https://stackoverflow.com/questions/31318107/spring-boot-cannot-access-rest-controller-on-localhost-404 https://stackoverflow.com/questions/3413520...

Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]:

July 26, 2021

Error: org.springframework.beans.factory.BeanCreationException : Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException : Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] org.hibernate.boot.registry.selector.spi.StrategySelectionException : Unable to resolve name [org.hibernate.dialect.MYSQL5InnoDBDialect] as strategy [org.hibernate.dialect.Dialect] in my case, it was caused by this spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MYSQL5InnoDBDialect instead of that you may use spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect The difference between MYSQL5InnoDBDialect and MYSQL5Dialect can be found by referring to this link : https://stackoverflow.com/questions/4368195/hibernate-w...