Transaction configure failed in Spring Boot - spring-boot

Question

update:
I found that I inject class A into class C which extends an external class,
and that class didn't managed by spring, like this:
public class C extends ExternalClass {
#AutoWired
private A a;
//doSomething...
}
That should be the main cause of transaction failure.
Another question: is there any way to make spring manage transaction of class A which has injected into anothor class that isn't handled by spring?
I'm building a project with Spring Boot and Mybatis.
I have a problem that one of service class cannot a create transactional connection and won't perform a roll back.
I found that if I removed injection of A Class in B Class, like this:
class A{
//#Autowired
//private B b;
// b is not used in this class
#Autowired
private ADao dao;
}
class B{
#Autowired
private BDao dao;
//Transaction of this method failed
//session didn't roll back
public void (){
dao.insert(new Entity ());
//Exception here
}
}
The connection created by class B would be transactional. Both of two class are in the same package, but if I add that injection, the transaction would fail. What made me much confused is that class B can inject into other class, and transaction would work well too.
Here is the log:
2018-01-05 21:30:33.861 DEBUG 10346 --- [http-nio-8099-exec-2] org.mybatis.spring.SqlSessionUtils 97 : Creating a new SqlSession
2018-01-05 21:30:33.866 DEBUG 10346 --- [http-nio-8099-exec-2] org.mybatis.spring.SqlSessionUtils 148 : SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession#3aeb5ca8] was not registered for synchronization because synchronization is not active
2018-01-05 21:30:33.888 DEBUG 10346 --- [http-nio-8099-exec-2] o.s.jdbc.datasource.DataSourceUtils 110 : Fetching JDBC Connection from DataSource
2018-01-05 21:30:33.888 DEBUG 10346 --- [http-nio-8099-exec-2] o.s.j.d.DriverManagerDataSource 142 : Creating new JDBC DriverManager Connection to [jdbc:mariadb://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true]
2018-01-05 21:30:33.905 DEBUG 10346 --- [http-nio-8099-exec-2] o.m.s.t.SpringManagedTransaction 87 : JDBC Connection [org.mariadb.jdbc.MySQLConnection#2bad8689] will not be managed by Spring
2018-01-05 21:30:33.908 DEBUG 10346 --- [http-nio-8099-exec-2] p.c.z.admin.dao.UserDao.insertSelective 159 : ==> Preparing: INSERT INTO sys_user ( id,username ) VALUES( ?,? )
2018-01-05 21:30:33.916 DEBUG 10346 --- [http-nio-8099-exec-2] p.c.z.admin.dao.UserDao.insertSelective 159 : ==> Parameters: null, test(String)
2018-01-05 21:30:33.929 DEBUG 10346 --- [http-nio-8099-exec-2] p.c.z.admin.dao.UserDao.insertSelective 159 : <== Updates: 1
2018-01-05 21:30:33.932 DEBUG 10346 --- [http-nio-8099-exec-2] p.c.z.a.d.U.insertSelective!selectKey 159 : ==> Executing: SELECT LAST_INSERT_ID()
2018-01-05 21:30:33.940 DEBUG 10346 --- [http-nio-8099-exec-2] p.c.z.a.d.U.insertSelective!selectKey 159 : <== Total: 1
2018-01-05 21:30:33.942 DEBUG 10346 --- [http-nio-8099-exec-2] org.mybatis.spring.SqlSessionUtils 191 : Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession#3aeb5ca8]
I've tried 3 ways to config transaction:
with java config:
#Bean(name = "transactionInterceptor")
public TransactionInterceptor transactionInterceptor(PlatformTransactionManager platformTransactionManager) {
TransactionInterceptor transactionInterceptor = new TransactionInterceptor();
transactionInterceptor.setTransactionManager(platformTransactionManager);
Properties transactionAttributes = new Properties();
transactionAttributes.setProperty("insert*","PROPAGATION_REQUIRED,-Throwable");
transactionAttributes.setProperty("update*","PROPAGATION_REQUIRED,-Throwable");
transactionAttributes.setProperty("delete*","PROPAGATION_REQUIRED,-Throwable");
transactionAttributes.setProperty("select*","PROPAGATION_REQUIRED,-Throwable,readOnly");
transactionInterceptor.setTransactionAttributes(transactionAttributes);
return transactionInterceptor;
}
#Bean
public BeanNameAutoProxyCreator transactionAutoProxy() {
BeanNameAutoProxyCreator transactionAutoProxy = new BeanNameAutoProxyCreator();
transactionAutoProxy.setProxyTargetClass(true);
transactionAutoProxy.setBeanNames("*ServiceImpl");
transactionAutoProxy.setInterceptorNames("transactionInterceptor");
return transactionAutoProxy;
}
and with xml：
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="del*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
<tx:method name="insert*" propagation="REQUIRED"/>
<tx:method name="*" rollback-for="Exception"/>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut id="services"
expression="execution(* root.*.service.*.*(..))"/>
<aop:advisor pointcut-ref="services" advice-ref="txAdvice"/>
</aop:config>
and with #Transactional.
However none of them worked.

Answer 1

The problem is that if you inject a class into another one which is not a spring managed bean, then the spring transaction management will failed.
So while having a transaction failure, go check if there is a wrong dependency injection.