Spring Data CRUD Repository: save method does not work

Finally, I've found a solution for my case.

Since I'm using Spring without its Boot part I had to configure custom WebApplicationInitializer to let Spring manage application entry point:

public class MainWebAppInitializer implements WebApplicationInitializer
{
    @Override
    public void onStartup(final ServletContext sc)
    {
        AnnotationConfigWebApplicationContext root = new AnnotationConfigWebApplicationContext();
        root.register(WebAppConfiguration.class, DataConfig.class);
        sc.addListener(new ContextLoaderListener(root));
        
        ...other not related code ommited
    }
}

So because I've registered both Config Classes (WebAppConfiguration.class, DataConfig.class) using AnnotationConfigWebApplicationContext#register I thought annotating configs with @Configuration would be Redundand.

And I was wrong at that point.

To register TransactionManager correctly you SHOULD annotate your Jpa Config class with @Configuration.

Thus I've managed to annotate my config classes with @Configuration and this solved my issue.

Now Spring CRUD Repositories are able to run DML queries to DB (with help of #save methods). Precisely talking: now Repositories are able to open own transactions and run required queries in terms of these transactions.

I didnot get this, how you are initializing the datasource properties ? I could not see in your given code.

factory.setDataSource(dataSource());

You should be designing you Configuration class like below. Use both the :

entityManagerFactoryRef="entityManagerFactory",
transactionManagerRef="jpaTransactionManager"

Read the hibernate properties from a yaml or properties file.

And set your datasource

Configuration class : DataConfig

/**
 * @author Som
 *
 */

@Configuration
@EnableJpaRepositories(basePackages="package-name",
                       entityManagerFactoryRef="entityManagerFactory",
                       transactionManagerRef="jpaTransactionManager")
@EnableTransactionManagement
@PropertySource(value = { "classpath:application.yml" })
public class DataConfig {
    
    @Autowired
    private Environment environment;
    
    @Value("${datasource.myapp.maxPoolSize:10}")
    private int maxPoolSize;
    
    
    /**
     * Populate DataSourceProperties object directly from application.yml 
     *       *
     */
    
    @Bean
    @Primary
    @ConfigurationProperties(prefix = "datasource.myapp")
    public DataSourceProperties dataSourceProperties(){
        return new DataSourceProperties();
    }
    
    
    /**
     * Configure HikariCP pooled DataSource.
     * 
     */
    @Bean
    public DataSource dataSource() {
        DataSourceProperties dataSourceProperties = dataSourceProperties();
        HikariDataSource dataSource = (HikariDataSource) DataSourceBuilder
                .create(dataSourceProperties.getClassLoader())
                .driverClassName(dataSourceProperties.getDriverClassName())
                .url(dataSourceProperties.getUrl())
                .username(dataSourceProperties.getUsername())
                .password(dataSourceProperties.getPassword())
                .type(HikariDataSource.class)
                .build();
        
        dataSource.setMaximumPoolSize(maxPoolSize);
        return dataSource;
    }
    
    
    /**
     * Entity Manager Factory setup.
     * 
     */
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws NamingException {
        LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
        factoryBean.setDataSource(dataSource());
        factoryBean.setPackagesToScan(new String[] { "package-name" });
        factoryBean.setJpaVendorAdapter(jpaVendorAdapter());
        factoryBean.setJpaProperties(jpaProperties());
        return factoryBean;
    }
    
    
    
    /**
     * Provider specific adapter.
     * 
     */
    @Bean
    public JpaVendorAdapter jpaVendorAdapter() {
        HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
        return hibernateJpaVendorAdapter;
    }
 
    /**
     * Hibernate properties.
     * 
     */
    private Properties jpaProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("datasource.myapp.hibernate.dialect"));
        properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("datasource.myapp.hibernate.hbm2ddl.method"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("datasource.myapp.hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("datasource.myapp.hibernate.format_sql"));
        if(StringUtils.isNotEmpty(environment.getRequiredProperty("datasource.myapp.defaultSchema"))){
            properties.put("hibernate.default_schema", environment.getRequiredProperty("datasource.myapp.defaultSchema"));
        }
        return properties;
    }
 
    @Bean
    @Autowired
    public PlatformTransactionManager jpaTransactionManager(EntityManagerFactory emf) {
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(emf);
        return txManager;
    }

}

application.yaml

server:
  port: 8081
  servlet:
    context-path: /CRUDApp
---
spring:
  profiles: local,default
datasource:
  myapp:
    url: jdbc:h2:~/test
    username: SA
    password:
    driverClassName: org.h2.Driver
    defaultSchema:
    maxPoolSize: 10
    hibernate:
      hbm2ddl.method: create-drop
      show_sql: true
      format_sql: true
      dialect: org.hibernate.dialect.H2Dialect
---