Hibernate startup very slow

Startup slow may be caused by this config:

<property name="hbm2ddl.auto">update</property>

This config means when hibernate start, check if the entity matching with ddl, and do action such as 'create','update'. This will cost too much time.

So the solution is comment this config. Then hibernate will start without validate.

For Postgres, add in application config:

spring.jpa.database-platform = org.hibernate.dialect.PostgreSQLDialect
spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=false

First line is necessary if not determine Dialect

Results

Before:

09:10:19.637 [main] INFO  o.h.annotations.common.Version - HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
09:14:17.159 [main] INFO  org.hibernate.dialect.Dialect - HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL9Dialect

~4 minutes

After:

09:40:10.930 [main] INFO  o.h.annotations.common.Version - HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
09:40:11.043 [main] INFO  org.hibernate.dialect.Dialect - HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect

~1 minute

See Hibernate Slow to Acquire Postgres Connection

hibernate.temp.use_jdbc_metadata_defaults=false

To avoid meta-data reload during SessionFactory creation.