camel jpa error in high-loaded mode - spring

Question

I try to use apache-camel in High-Loaded project, where every second waiting more user's connections. In single-mode everything is OK, but when user's requests more then 10,I have some errors,for example
"javax.persistence.PersistenceException: org.hibernate.HibernateException: Flush during cascade is dangerous"
or
"Could not synchronize database state with session
org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update"
and etc.
My route looks like :
from("some url")
.to("jpa:myEntity")
.process("here I read saved entity,and create new entity")
.to("jpa:mySeconEntity")
My persistance.xml:
<persistence-unit name="myUnit" transaction-type="RESOURCE_LOCAL">
</persistence-unit>
My spring-config:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="driver.for.db"/>
<property name="url" value="url.to.db"/>
<property name="username" value="username"/>
<property name="password" value="pass"/>
</bean>
<bean id="jpa" class="org.apache.camel.component.jpa.JpaComponent">
<property name="entityManagerFactory" ref="entityManagerFactory" />
<property name="transactionManager" ref="transactionManager"/>
</bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="paymentGateway" />
<property name="jpaProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</prop>
<prop key="hibernate.jdbc.batch_size">20</prop>
</props>
</property>
<property name="dataSource" ref="dataSource"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
Version of camel - 2.12.0. Your suggestions? My problem contains in configuration of transactions or in jpa consumer's params, when I save entities to database?