jpa - No active transaction in EJB @Schedule method -

i have ejb @schedule marked method, persists entity database. within method, when i'm calling entitymanager.flush() after persist(), i'm getting javax.persistence.transactionrequiredexception: no transaction active

afaik ejb methods transactional, i'm getting error if additionally mark method @transactionattribute(required).

when manage transaction manually entitytransaction.begin() , commit(), works ok.

i'm using wildfly 10.0 final on jdk 8u74, eclipselink 2.6.0.

here persistence.xml:

<?xml version="1.0" encoding="utf-8"?> <persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="2.1">         <persistence-unit name="mainpu" transaction-type="jta">         <provider>org.eclipse.persistence.jpa.persistenceprovider</provider>         <jta-data-source>java:/datasources/exampleds</jta-data-source>         <class>com.example.myentity</class>     </persistence-unit>     </persistence> 

myejb.java:

package com.example;  import javax.ejb.*; import javax.ejb.timer; import javax.persistence.entitymanager; import javax.persistence.persistencecontext;  @startup @dependson("apputils") @singleton public class myejb {     @persistencecontext(unitname = "mainpu")     private entitymanager em;      @schedule(hour = "*", minute = "*", second = "*/20", info = "", persistent = false)     private void dostuff(timer timer) {         myentity entity = new myentity("test" + math.random(), "test value");         em.merge(entity);         em.flush();     } } 

when use jta commit , flush changes database , close current transaction. so, when em.flush(), transaction closed.