Spring 如何将字符串字段迁移到枚举？

我有两个版本的产品实体，可以将数据从一个迁移到另一个。“单位”属性就是问题所在。原始文件将千克单位保留为“千克”，迁移后应保留为“千克”

新产品实体有：

@Enumerated(EnumType.STRING)
public Unit unit;

我写了一个转换器：

    @Converter(autoApply = true)
    public class UnitConverter implements AttributeConverter<Unit, String> {

    @Override
    public String convertToDatabaseColumn(Unit attribute) {

        switch (attribute) {

        case KG:
            return "kg";
        case LT:
            return "lt";
        case MT:
            return "mt";
        case PCS:
            return "pcs";

        }

        return null;

    }

    @Override
    public Unit convertToEntityAttribute(String dbData) {

        switch (dbData) {

        case "kg":
            return Unit.KG;
        case "lt":
            return Unit.LT;
        case "mt":
            return Unit.MT;
        case "pcs":
            return Unit.PCS;

        }

        return null;

    }

}

但我明白了

getInt（）的值无效-“kg”

java.lang.IllegalStateException:无法执行CommandLineRunner
位于org.springframework.boot.SpringApplication.callRunner（SpringApplication.java:801）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
位于org.springframework.boot.SpringApplication.callRunners（SpringApplication.java:782）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
在org.springframework.boot.SpringApplication.afterRefresh（SpringApplication.java:769）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
在org.springframework.boot.SpringApplication.run（SpringApplication.java:314）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
在org.springframework.boot.SpringApplication.run（SpringApplication.java:1185）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
在org.springframework.boot.SpringApplication.run（SpringApplication.java:1174）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
在erp.migration.MigrationApplication.main（MigrationApplication.java:21）[bin/：na]
原因：org.springframework.orm.jpa.JpaSystemException:无法执行查询；嵌套异常为org.hibernate.exception.genericjdbception:无法执行查询
在org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException（HibernateJpaDialect.java:333）~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateException如果可能（HibernateJpaDialect.java:244）~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.TranslateExceptionIffailable（AbstractEntityManagerFactoryBean.java:491）~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfmable（ChainedPersistenceExceptionTranslator.java:59）~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.dao.support.DataAccessUtils.translateIfNecessary（DataAccessUtils.java:213）~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke（PersistenceExceptionTranslationInterceptor.java:147）~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:179）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
位于org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke（CrudMethodMetadataPostProcessor.java:133）~[spring-data-jpa-1.10.2.RELEASE.jar:na]
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:179）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke（ExposeInvocationInterceptor.java:92）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:179）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.JdkDynamicAopProxy.invoke（JdkDynamicAopProxy.java:213）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在com.sun.proxy.$Proxy102.findAll（未知源）~[na:na]
在erp.migration.CommandRunner.migrateMaterials（CommandRunner.java:110）~[bin/：na]
在erp.migration.CommandRunner.run（CommandRunner.java:99）~[bin/：na]
在erp.migration.CommandRunner$$FastClassBySpringCGLIB$$d69da090.invoke（）~[bin/:na]
在org.springframework.cglib.proxy.MethodProxy.invoke（MethodProxy.java:204）~[spring-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint（CglibAopProxy.java:720）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:157）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation（TransactionInterceptor.java:99）~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.transaction.interceptor.TransactionSpectSupport.invokeWithinTransaction（TransactionSpectSupport.java:280）~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:96）~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:179）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept（CglibAopProxy.java:655）~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
在erp.migration.CommandRunner$$EnhancerBySpringCGLIB$$8bb3a8a3.run（）~[bin/:na]
位于org.springframework.boot.SpringApplication.callRunner（SpringApplication.java:798）[spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
... 省略了6个公共框架
原因：org.hibernate.exception.genericjdbception:无法执行查询
在org.hibernate.exception.internal.StandardSQLExceptionConverter.convert（StandardSQLExceptionConverter.java:47）~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
在org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert（SqlExceptionHelper.java:109）~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
在org.hibernate.loader.loader.doList（loader.java:2620）~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
在org.hibernate.loader.loader.doList（loader.java:2600）~[hibernate-core-5.0.9.F
public Unit unit;

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:801) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:782) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:769) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1185) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1174) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    at erp.migration.MigrationApplication.main(MigrationApplication.java:21) [bin/:na]
Caused by: org.springframework.orm.jpa.JpaSystemException: could not execute query; nested exception is org.hibernate.exception.GenericJDBCException: could not execute query
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:333) ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244) ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:491) ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133) ~[spring-data-jpa-1.10.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at com.sun.proxy.$Proxy102.findAll(Unknown Source) ~[na:na]
    at erp.migration.CommandRunner.migrateMaterials(CommandRunner.java:110) ~[bin/:na]
    at erp.migration.CommandRunner.run(CommandRunner.java:99) ~[bin/:na]
    at erp.migration.CommandRunner$$FastClassBySpringCGLIB$$d69da090.invoke(<generated>) ~[bin/:na]
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:280) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at erp.migration.CommandRunner$$EnhancerBySpringCGLIB$$8bb3a8a3.run(<generated>) ~[bin/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:798) [spring-boot-1.4.0.RELEASE.jar:1.4.0.RELEASE]
    ... 6 common frames omitted
Caused by: org.hibernate.exception.GenericJDBCException: could not execute query
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.doList(Loader.java:2620) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.doList(Loader.java:2600) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2429) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.list(Loader.java:2424) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1326) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606) ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483) ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:50) ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final]
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:327) ~[spring-data-jpa-1.10.2.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_111]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_111]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_111]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:503) ~[spring-data-commons-1.12.2.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:488) ~[spring-data-commons-1.12.2.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460) ~[spring-data-commons-1.12.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.12.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:280) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.3.2.RELEASE.jar:4.3.2.RELEASE]
    ... 26 common frames omitted
Caused by: java.sql.SQLException: Invalid value for getInt() - 'kg'
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963) ~[mysql-connector-java-5.1.39.jar:5.1.39]
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896) ~[mysql-connector-java-5.1.39.jar:5.1.39]
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885) ~[mysql-connector-java-5.1.39.jar:5.1.39]
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860) ~[mysql-connector-java-5.1.39.jar:5.1.39]
    at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2517) ~[mysql-connector-java-5.1.39.jar:5.1.39]
    at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2583) ~[mysql-connector-java-5.1.39.jar:5.1.39]
    at org.hibernate.type.EnumType$OrdinalEnumValueMapper.getValue(EnumType.java:337) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.type.EnumType.nullSafeGet(EnumType.java:231) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.type.CustomType.nullSafeGet(CustomType.java:111) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.type.AbstractType.hydrate(AbstractType.java:85) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2727) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1729) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1655) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.getRow(Loader.java:1544) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:727) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.processResultSet(Loader.java:972) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.doQuery(Loader.java:930) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    at org.hibernate.loader.Loader.doList(Loader.java:2617) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
    ... 53 common frames omitted