常见异常整理

最新推荐文章于 2024-11-18 08:49:24 发布

绿芽在山顶

最新推荐文章于 2024-11-18 08:49:24 发布

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本文链接：https://blog.youkuaiyun.com/weufengwangshi_/article/details/89105410

本文介绍了一种解决SSH框架整合过程中出现的Javassist增强失败的方法，通过调整Hibernate配置与实体类映射文件中的lazy加载属性来避免异常。

HHH000142: Javassist Enhancement failed: com.xxx.xxx

在实体类映射文件中配置了many-to-one后，出现了上述的错误

解决办法：在many-to-one标签中，设置lazy属性值为false

<many-to-one name="custSource" column="cust_source" class="com.itheima.domain.BaseDict" lazy="false"></many-to-one>
<many-to-one name="custLevel" column="cust_level" class="com.itheima.domain.BaseDict" lazy="false"></many-to-one>

Caused by: org.hibernate.tool.schema.spi.SchemaManagementException

target [alter table t_user add column uid integer not null]
   at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:59)
   at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:431)
   at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:449)
   at org.hibernate.tool.schema.internal.SchemaMigratorImpl.migrateTable(SchemaMigratorImpl.java:253)
   at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets(SchemaMigratorImpl.java:170)
   at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:60)
   at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:133)
   at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:101)
   at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:470)
   at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
   at cn.itcast.utils.HibernateUtils.<clinit>(HibernateUtils.java:12)

在整合ssh框架时，测试数据库配置是否正确，遇到此异常。

之前是

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

改为

<property name="hibernate.hbm2ddl.auto">create</property>