MybatisPlus整合Flowable出现错误怎么解决

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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);                }            }        }    }}

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