Given the following Spring persistence configuration:

```
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

<tx:annotation-driven/>

<bean id="transactionManager" class="org.springframework.orm.jdo.JdoTransactionManager"
    p:persistenceManagerFactory-ref="localPersistenceManagerFactoryBean" />

<bean id="transactionAwarePersistenceManagerFactoryProxy"
    class="org.springframework.orm.jdo.TransactionAwarePersistenceManagerFactoryProxy"
    p:targetPersistenceManagerFactory-ref="localPersistenceManagerFactoryBean"
    p:allowCreate="false" />

<bean id="localPersistenceManagerFactoryBean"
    class="org.springframework.orm.jdo.LocalPersistenceManagerFactoryBean">
    <property name="jdoPropertyMap">
        <props>
            <prop key="javax.jdo.PersistenceManagerFactoryClass">
                org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManagerFactory
            </prop>
            <prop key="javax.jdo.option.ConnectionURL">appengine</prop>
            <prop key="javax.jdo.option.NontransactionalRead">true</prop>
            <prop key="javax.jdo.option.NontransactionalWrite">false</prop>
            <prop key="javax.jdo.option.RetainValues">false</prop>
            <prop key="javax.jdo.option.DetachAllOnCommit">true</prop>
            <prop key="javax.jdo.option.Multithreaded">true</prop>
            <prop key="datanucleus.appengine.ignorableMetaDataBehavior">NONE</prop>
            <prop key="datanucleus.appengine.autoCreateDatastoreTxns">true</prop>
        </props>
    </property>
</bean>

```

I have a simple service such as:

```
@Service
@Transactional
public class EntityServiceImpl implements EntityService {

@Autowired
private EntityRepository entityRepository;

@Override
public void create(Entity entity) {
    entityRepository.create(entity);
}   
}

```

The following is the underlying repository:

```
@Repository
public class EntityAppEngineRepositoryImpl extends BaseAppEngineTxManager
    implements EntityRepository {

@Override
public void create(Entity entity) {
    final PersistenceManager pm = getPersistenceManager();
    pm.makePersistent(entity);
}
}

```

When I call my service method to create an entity I get the following exception:

```
org.datanucleus.jdo.exceptions.TransactionNotWritableException: Impossible to perform operation since it either requires an active transaction or 'NontransactionalRead' enabled. You have neither of these.
at org.datanucleus.jdo.JDOPersistenceManager.assertWritable(JDOPersistenceManager.java:2149)
at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:687)
at org.springframework.samples.mvc.basic.services.impl.EntityAppEngineRepositoryImpl.create(EntityAppEngineRepositoryImpl.java:25)
at org.springframework.samples.mvc.basic.services.impl.EntityServiceImpl.create(EntityServiceImpl.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy19.create(Unknown Source)
at org.springframework.samples.mvc.basic.boot.Bootstrap.createEntity(Bootstrap.java:31)
at org.springframework.samples.mvc.basic.boot.Bootstrap.onApplicationEvent(Bootstrap.java:20)
at org.springframework.samples.mvc.basic.boot.Bootstrap.onApplicationEvent(Bootstrap.java:1)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:97)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:324)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:929)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:467)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:631)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:588)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:645)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:508)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:449)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:133)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:196)
at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:239)
at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:146)
at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:189)
at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:128)
at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:104)
enter code here

```

Any idea why my transaction isn't active?

Thanks!