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Error creating bean with name 'entityManagerFactory' defined in class path resource: Invocation of init method failed

java
hibernate
spring-boot
entity-manager
Anton ShumikhinbyAnton Shumikhin·Dec 1, 2024
TLDR

The entityManagerFactory tantrum might be due to the following reasons:

  • Entity annotations have gone rogue.
  • @EntityScan decided to go on a vacation.
@EntityScan("com.yourapp.domain") // All entities, stand in line.
  • Database properties turned hostile.
  • The stack trace is hiding something.
spring.datasource.url=jdbc:yourdb://localhost:3306/yourdb // Uncle Larry sends his regards. spring.datasource.username=dbuser // "dbuser", really? C'mon, you're better than this. spring.datasource.password=dbpass // No points for creativity.

Checking the connection pool party

Our Data Sorcerer might be tired, increasing both 'maxPoolSize' and 'borrowConnectionTimeout' will help.

<property name="maxPoolSize" value="50"/> // More room for the party. <property name="borrowConnectionTimeout" value="30"/> // Less haste, more speed.

Dealing with dependency drama

javax.xml.bind:jaxb-api v 2.3.0, org.javassist:javassist v 3.25.0-GA are a must-have in your Maven allies.

<dependency> // Tonight, we dine in hell - JAXB <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.0</version> </dependency> <dependency> // Our silent hero - Javassist <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.25.0-GA</version> </dependency>

Art of entity embedding

  • Ensure that our entity engraving (annotations) are in sync with the actual database structure.
  • Avoid extra fluff in your entity classes that are not present in your database.

Hibernate-Spring love story

Our entityManagerFactory bean depends heavily on Hibernate and Spring. Validate the:

  • Coherency of your Hibernate EntityManager configuration.
  • Spring Boot, MySQL connector, and JTA Atomikos dependencies in your pom.xml.

Debugging the entity factory

Corruptions and initialization riddles can add torment to our entityManagerFactory. When things are topsy-turvy:

  • Reinstall dependencies like hibernate-core and hibernate-entitymanager from Maven repository.

Decoding entity road-signs

Learning from errors is key. Far from being just gibberish, detailed error messages will often conceal:

  • The specific module responsible for the error.
  • The kind of error incurred.
  • Feelings of betrayal from your database.

Destination database

Not all who wander in your code are lost. Some might be your DB connection:

  • Confirm that the DB is accessible.
  • Cross-check the spring.datasource.url for correctness.
  • Invest in a good connection-testing tool or script.

Spring Boot detour

Even on the darkest code paths, a well-formed query can be your guiding star. When all else fails:

  • Realign the mappings in your @Entity and @Table annotations.
  • Synchronize your Spring Boot and Hibernate configurations.
  • Dive into the depth of your Maven pom.xml to retrieve lost artifacts.