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MybatisPlus整合Flowable出现的坑及解决

 更新时间：2023年03月30日 09:48:31   作者：夕夕夕兮  
这篇文章主要介绍了MybatisPlus整合Flowable出现的坑及解决方案，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教

摘要：现在在项目中使用的MybatisPlus，最近研究了一下流程框架Flowable,看了很多技术文档博客，打算直接整合进去，先记录一下遇到的问题：  

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。

所以问题就来了，找到了这两个bean冲突，接下来如何进行解决呢，查看了一下源码并查阅了其他大佬的技术博客，记录一下

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;

/**
 * @author xw
 * @description 重写mybatis-plus 自动配置类
 * @date 2022/1/7 14:06
 */
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;

/**
 * @author xw
 * @description
 * @date 2022/1/7 16:24
 */
@MapperScan(
        sqlSessionTemplateRef = "mySqlSessionTemplate",
        sqlSessionFactoryRef = "mySqlSessionFactory"
)
@EnableConfigurationProperties(MybatisPlusProperties.class)
@Configuration
public 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;

/**
 * @author xw
 * @description 重写 flowable-modeler 中 ModelerDatabaseConfiguration
 * @date 2022/1/7 16:31
 */

@Configuration
@Slf4j
public 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 = "h2";
    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);
                }
            }
        }
    }

}

总结

以上关于Mybatis-Plus整合Flowable的坑就处理完啦，重启ok! - 之后也会找个时间记录SpringCloud微服务中整合Flowable服务的流程，加油！希望能给大家一个参考，也希望大家多多支持脚本之家。

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