HHH000142: Javassist Enhancement failed: com.xxx.xxx
在實體類映射文件中配置了many-to-one後，出現了上述的錯誤
解決辦法：在many-to-one標籤中，設置lazy屬性值爲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框架時，測試數據庫配置是否正確，遇到此異常。
之前是
<property name="hibernate.hbm2ddl.auto">update</property>
改爲
<property name="hibernate.hbm2ddl.auto">create</property>