Getting random "Connection is read-only" - Spring - spring

Question

I've spent the last couple of days debugging some really strange errors.
I have an exposed WebService which calls a service-metod called "addNewOrder"
This service-method is annotated with
#Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)
This service-method will need to read and write to the database.
I would think that the annotation above would ensure that every time this method is called, i'm getting a new transaction that can do what is needed.
But about 50% of the time, when "addNewOrder" is called, i get these strange errors:
org.hibernate.engine.jdbc.spi.SqlExceptionHelper:143 - SQL Error: 0, SQLState: S1009
org.hibernate.engine.jdbc.spi.SqlExceptionHelper:144 - Connection is read-only. Queries leading to data modification are not allowed
Does anyone have any clue as to why this might happen? And why is it random?
Im using Spring 3.2.4, Hibernate 4.1.7, Mysql-connector 5.1.26
This is my applicationContext snippet:
<?xml version="1.0" encoding="iso-8859-1"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="no.aida.model"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="${jpa.show.sql}"/>
<property name="generateDdl" value="${jpa.generate.ddl}"/>
<property name="databasePlatform" value="${jpa.dialect}"/>
</bean>
</property>
<property name="jpaDialect">
<bean id="jpaDialect" class="no.aida.dao.hibernate.IsolationSupportHibernateJpaDialect" />
</property>
</bean>
<!-- javax.sql.DataSource supplied by Jakarta Commons Connection Pooling -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${mysql.db.driver}"/>
<property name="url" value="${mysql.db.url}"/>
<property name="username" value="${mysql.db.username}"/>
<property name="password" value="${mysql.db.password}"/>
<property name="initialSize" value="3" />
<property name="maxActive" value="30" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- Enable #Transactional support -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

Answer 1

Well i'll be damned. Just a few mins after posting this i finally found the error. The reason it is random is because I have another service-method called "getStatus" which is annotated by read-only. And if this is called then every request using the same connection will also be read-only. But i still cant understand why the read-only is not re-set when the connection is used on a method annotated with readOnly = false...
And to add to the saga. The reason why the connections was not reset, was because we had implemented a custom JpaDialect that had forgotten to reset the connections... doooooh!

Answer 2

value="${mysql.db.url}"
Could you please specify the connect url? Do you use:
failOverReadOnly=false
or not? This should help.
BR, Ilya