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问题
Description:
file [D:\project\carshow-server\server-flowable\flowable-admin\target\classes\com\carshow\flowable\mapper\IFlowableCommentMapper.class] required a single bean, but 2 were found:
- sqlSessionFactory: defined by method 'sqlSessionFactory' in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]
- modelerSqlSessionFactory: defined by method 'modelerSqlSessionFactory' in class path resource [org/flowable/ui/modeler/conf/ModelerDatabaseConfiguration.class]
Action:Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
原因
整合的bean冲突，spring找到了两个
查看两个类源码找到对应的bean
MybatisPlus： MybatisPlusAutoConfiguration.class
Flowable：ModelerDatabaseConfiguration.class
注解解释
@ConditionalOnMissingBean：它是修饰bean的一个注解，主要实现的是，当你的bean被注册之后，如果有注册相同类型的bean，就不会成功，它会保证你的bean只有一个，即你的实例只有一个，当你注册多个相同的bean时，会出现异常，以此来告诉开发人员。
1. 环境：Flowable6.6
2. 解决：
重写mybatis-plus 自动配置类（由于 flowable-modeler 引入时候，会初始化 mybatis的Template和SqlFactory，这导致 mybatis-plus 本身的autoconfig 无法生效，所以需要重写），从源码中拆写代码：
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusProperties;import com.baomidou.mybatisplus.autoconfigure.SpringBootVFS;import com.baomidou.mybatisplus.core.MybatisConfiguration;import com.baomidou.mybatisplus.core.config.GlobalConfig;import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;import com.baomidou.mybatisplus.core.incrementer.IKeyGenerator;import com.baomidou.mybatisplus.core.injector.ISqlInjector;import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;import org.apache.ibatis.mapping.DatabaseIdProvider;import org.apache.ibatis.plugin.Interceptor;import org.apache.ibatis.session.ExecutorType;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.context.ApplicationContext;import org.springframework.core.io.ResourceLoader;import org.springframework.util.StringUtils;import javax.sql.DataSource;import java.util.List;public class AbstractMybatisPlusConfiguration { protected SqlSessionFactory getSqlSessionFactory( DataSource dataSource, MybatisPlusProperties properties, ResourceLoader resourceLoader, Interceptor[] interceptors, DatabaseIdProvider databaseIdProvider, ApplicationContext applicationContext ) throws Exception { MybatisSqlSessionFactoryBean factory = new MybatisSqlSessionFactoryBean(); factory.setDataSource(dataSource); factory.setVfs(SpringBootVFS.class); if (StringUtils.hasText(properties.getConfigLocation())) { factory.setConfigLocation(resourceLoader.getResource(properties.getConfigLocation())); } applyConfiguration(factory, properties); if (properties.getConfigurationProperties() != null) { factory.setConfigurationProperties(properties.getConfigurationProperties()); } if (!ObjectUtils.isEmpty(interceptors)) { factory.setPlugins(interceptors); } if (databaseIdProvider != null) { factory.setDatabaseIdProvider(databaseIdProvider); } if (StringUtils.hasLength(properties.getTypeAliasesPackage())) { factory.setTypeAliasesPackage(properties.getTypeAliasesPackage()); } // TODO 自定义枚举包 if (StringUtils.hasLength(properties.getTypeEnumsPackage())) { factory.setTypeEnumsPackage(properties.getTypeEnumsPackage()); } if (properties.getTypeAliasesSuperType() != null) { factory.setTypeAliasesSuperType(properties.getTypeAliasesSuperType()); } if (StringUtils.hasLength(properties.getTypeHandlersPackage())) { factory.setTypeHandlersPackage(properties.getTypeHandlersPackage()); } if (!ObjectUtils.isEmpty(properties.resolveMapperLocations())) { factory.setMapperLocations(properties.resolveMapperLocations()); } // TODO 此处必为非 NULL GlobalConfig globalConfig = properties.getGlobalConfig(); //注入填充器 if (applicationContext.getBeanNamesForType(MetaObjectHandler.class, false, false).length > 0) { MetaObjectHandler metaObjectHandler = applicationContext.getBean(MetaObjectHandler.class); globalConfig.setMetaObjectHandler(metaObjectHandler); } //注入主键生成器 if (applicationContext.getBeanNamesForType(IKeyGenerator.class, false, false).length > 0) { IKeyGenerator keyGenerator = applicationContext.getBean(IKeyGenerator.class); globalConfig.getDbConfig().setKeyGenerators((List<IKeyGenerator>) keyGenerator); } //注入sql注入器 if (applicationContext.getBeanNamesForType(ISqlInjector.class, false, false).length > 0) { ISqlInjector iSqlInjector = applicationContext.getBean(ISqlInjector.class); globalConfig.setSqlInjector(iSqlInjector); } factory.setGlobalConfig(globalConfig); return factory.getObject(); } private void applyConfiguration(MybatisSqlSessionFactoryBean factory, MybatisPlusProperties properties) { MybatisConfiguration configuration = properties.getConfiguration(); if (configuration == null && !StringUtils.hasText(properties.getConfigLocation())) { configuration = new MybatisConfiguration(); }// if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) {// for (ConfigurationCustomizer customizer : this.configurationCustomizers) {// customizer.customize(configuration);// }// } factory.setConfiguration(configuration); } public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory, MybatisPlusProperties properties) { ExecutorType executorType = properties.getExecutorType(); if (executorType != null) { return new SqlSessionTemplate(sqlSessionFactory, executorType); } else { return new SqlSessionTemplate(sqlSessionFactory); } }}继承重写的配置类
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusProperties;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.ResourceLoader;import javax.sql.DataSource;@MapperScan( sqlSessionTemplateRef = "mySqlSessionTemplate", sqlSessionFactoryRef = "mySqlSessionFactory")@EnableConfigurationProperties(MybatisPlusProperties.class)@Configurationpublic class MybatisPlusConfiguration extends AbstractMybatisPlusConfiguration { @Bean(name = "mySqlSessionFactory") public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource, MybatisPlusProperties properties, ResourceLoader resourceLoader, ApplicationContext applicationContext) throws Exception { return getSqlSessionFactory(dataSource, properties, resourceLoader, null, null, applicationContext); } @Bean(name = "mySqlSessionTemplate") public SqlSessionTemplate sqlSessionTemplate(MybatisPlusProperties properties, @Qualifier("mySqlSessionFactory") SqlSessionFactory sqlSessionFactory) { return getSqlSessionTemplate(sqlSessionFactory, properties); }}重写 flowable-modeler 中 ModelerDatabaseConfiguration,用 @Primary 指定框架内部的mybatis 作为默认的
import liquibase.Liquibase;import liquibase.database.Database;import liquibase.database.DatabaseConnection;import liquibase.database.DatabaseFactory;import liquibase.database.jvm.JdbcConnection;import liquibase.exception.DatabaseException;import liquibase.resource.ClassLoaderResourceAccessor;import lombok.extern.slf4j.Slf4j;import org.apache.ibatis.session.SqlSessionFactory;import org.flowable.common.engine.api.FlowableException;import org.flowable.ui.common.service.exception.InternalServerErrorException;import org.flowable.ui.modeler.properties.FlowableModelerAppProperties;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.core.io.ResourceLoader;import org.springframework.core.io.support.ResourcePatternUtils;import javax.sql.DataSource;import java.sql.Connection;import java.sql.DatabaseMetaData;import java.sql.SQLException;import java.util.Properties;@Configuration@Slf4jpublic class DatabaseConfiguration { protected static final String LIQUIBASE_CHANGELOG_PREFIX = "ACT_DE_"; @Autowired protected FlowableModelerAppProperties modelerAppProperties; @Autowired protected ResourceLoader resourceLoader; protected static Properties databaseTypeMappings = getDefaultDatabaseTypeMappings(); public static final String DATABASE_TYPE_H2 = "h3"; public static final String DATABASE_TYPE_HSQL = "hsql"; public static final String DATABASE_TYPE_MYSQL = "mysql"; public static final String DATABASE_TYPE_ORACLE = "oracle"; public static final String DATABASE_TYPE_POSTGRES = "postgres"; public static final String DATABASE_TYPE_MSSQL = "mssql"; public static final String DATABASE_TYPE_DB2 = "db2"; public static Properties getDefaultDatabaseTypeMappings() { Properties databaseTypeMappings = new Properties(); databaseTypeMappings.setProperty("H2", DATABASE_TYPE_H2); databaseTypeMappings.setProperty("HSQL Database Engine", DATABASE_TYPE_HSQL); databaseTypeMappings.setProperty("MySQL", DATABASE_TYPE_MYSQL); databaseTypeMappings.setProperty("Oracle", DATABASE_TYPE_ORACLE); databaseTypeMappings.setProperty("PostgreSQL", DATABASE_TYPE_POSTGRES); databaseTypeMappings.setProperty("Microsoft SQL Server", DATABASE_TYPE_MSSQL); databaseTypeMappings.setProperty(DATABASE_TYPE_DB2, DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/NT", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/NT64", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2 UDP", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/LINUX", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/LINUX390", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/LINUXX8664", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/LINUXZ64", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/LINUXPPC64", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/400 SQL", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/6000", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2 UDB iSeries", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/AIX64", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/HPUX", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/HP64", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/SUN", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/SUN64", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/PTX", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2/2", DATABASE_TYPE_DB2); databaseTypeMappings.setProperty("DB2 UDB AS400", DATABASE_TYPE_DB2); return databaseTypeMappings; } @Bean @Primary public SqlSessionFactory sqlSessionFactory(DataSource dataSource) { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource(dataSource); String databaseType = initDatabaseType(dataSource); if (databaseType == null) { throw new FlowableException("couldn't deduct database type"); } try { Properties properties = new Properties(); properties.put("prefix", modelerAppProperties.getDataSourcePrefix()); properties.put("blobType", "BLOB"); properties.put("boolValue", "TRUE"); properties.load(this.getClass().getClassLoader().getResourceAsStream("org/flowable/db/properties/" + databaseType + ".properties")); sqlSessionFactoryBean.setConfigurationProperties(properties); sqlSessionFactoryBean .setMapperLocations(ResourcePatternUtils.getResourcePatternResolver(resourceLoader).getResources("classpath:/META-INF/modeler-mybatis-mappings/*.xml")); sqlSessionFactoryBean.afterPropertiesSet(); return sqlSessionFactoryBean.getObject(); } catch (Exception e) { throw new FlowableException("Could not create sqlSessionFactory", e); } } @Primary @Bean(destroyMethod = "clearCache") // destroyMethod: see https://github.com/mybatis/old-google-code-issues/issues/778 public SqlSessionTemplate SqlSessionTemplate(SqlSessionFactory sqlSessionFactory) { return new SqlSessionTemplate(sqlSessionFactory); } @Bean public Liquibase liquibase(DataSource dataSource) { log.info("Configuring Liquibase"); Liquibase liquibase = null; try { DatabaseConnection connection = new JdbcConnection(dataSource.getConnection()); Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(connection); database.setDatabaseChangeLogTableName(LIQUIBASE_CHANGELOG_PREFIX + database.getDatabaseChangeLogTableName()); database.setDatabaseChangeLogLockTableName(LIQUIBASE_CHANGELOG_PREFIX + database.getDatabaseChangeLogLockTableName()); liquibase = new Liquibase("META-INF/liquibase/flowable-modeler-app-db-changelog.xml", new ClassLoaderResourceAccessor(), database); liquibase.update("flowable"); return liquibase; } catch (Exception e) { throw new InternalServerErrorException("Error creating liquibase database", e); } finally { closeDatabase(liquibase); } } protected String initDatabaseType(DataSource dataSource) { String databaseType = null; Connection connection = null; try { connection = dataSource.getConnection(); DatabaseMetaData databaseMetaData = connection.getMetaData(); String databaseProductName = databaseMetaData.getDatabaseProductName(); log.info("database product name: '{}'", databaseProductName); databaseType = databaseTypeMappings.getProperty(databaseProductName); if (databaseType == null) { throw new FlowableException("couldn't deduct database type from database product name '" + databaseProductName + "'"); } log.info("using database type: {}", databaseType); } catch (SQLException e) { log.error("Exception while initializing Database connection", e); } finally { try { if (connection != null) { connection.close(); } } catch (SQLException e) { log.error("Exception while closing the Database connection", e); } } return databaseType; } private void closeDatabase(Liquibase liquibase) { if (liquibase != null) { Database database = liquibase.getDatabase(); if (database != null) { try { database.close(); } catch (DatabaseException e) { log.warn("Error closing database", e); } } } }}关于“MybatisPlus整合Flowable出现错误怎么解决”这篇文章的内容就介绍到这里，感谢各位的阅读！相信大家对“MybatisPlus整合Flowable出现错误怎么解决”知识都有一定的了解，大家如果还想学习更多知识，欢迎关注编程网行业资讯频道。
