Because the project was too busy, I finally had time to learn jpa again today. I didn't expect that I was given a head start when I first came up. I reported several mistakes in a row and recorded them.
| Error message | solution |
|---|---|
| java.sql.SQLSyntaxErrorException: Table ‘sell.hibernate_sequence’ doesn’t exist | Add @GeneratedValue(strategy = GenerationType.IDENTITY) to the entity class |
| org.hibernate.LazyInitializationException: could not initialize proxy [com.yz.dataobject.ProductCategory#2] - no Session | 1. Add spring.jpa.open-in-view=true to the configuration file 2. Add spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true to the configuration file 3. Add @Proxy(lazy = false) to the entity class |
| org.hibernate.exception.ConstraintViolationException: could not execute statement | There are many reasons for this error, usually due to duplicate fields |
| java.lang.IllegalArgumentException: Parameter value element [1] did not match expected type [java.lang.String (n/a)] | Method parameter type is incorrect |
| java.lang.IllegalStateException: Failed to load ApplicationContext | Used a method not supported by jap |
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