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POpersistence.xml - spring JPA
 

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    <p>I have read dozens of articles, but I cant figure out, where the mistake is... it should be really simple. I'm trying to write app on appengine using Spring and JPA.</p> <p>I am using JEE5 project (dont know if it matters)</p> <pre><code>&lt;tx:annotation-driven transaction-manager="transactionManager"/&gt; &lt;bean id="persistenceUnitManager" class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager"&gt; &lt;property name="persistenceXmlLocation"&gt; &lt;value&gt;classpath*:/META-INF/persistence.xml&lt;/value&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"&gt; &lt;property name="persistenceUnitName" value="transactions-optional" /&gt; &lt;/bean&gt; &lt;bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"&gt; &lt;property name="entityManagerFactory" ref="entityManagerFactory" /&gt; &lt;/bean&gt; &lt;bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" /&gt; &lt;bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" /&gt; </code></pre> <p>The persistence.xml file is located in META-INF directory (ROOT/META-INF/persistence.xml)</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" ?&gt; &lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"&gt; &lt;persistence-unit name="transactions-optional"&gt; &lt;provider&gt;org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider&lt;/provider&gt; &lt;properties&gt; &lt;property name="datanucleus.NontransactionalRead" value="true"/&gt; &lt;property name="datanucleus.NontransactionalWrite" value="true"/&gt; &lt;property name="datanucleus.ConnectionURL" value="appengine"/&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>I still get this exception (i was trying to move meta-inf directory in src directory with no success, the exception was the same)</p> <pre><code>Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'genericJpaDAO': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected javax.persistence.EntityManagerFactory cz.cvut.fel.pupilbook.dao.support.jpa.GenericJpaDAO.entityManagerfactory; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/context/applicationContext.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: No Persistence provider for EntityManager named transactions-optional at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1074) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190) at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:844) </code></pre> <p>Thanks for help.</p>
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    1. COIs `META-INF/persistence.xml` in your compilation output (where your compiled classes settle)? If no, then have you tried to place `META-INF/persistence.xml` there manually and see if the issue persists?
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      1. USDenis Kniazhev
    2. COyep, its in target/name_of_the_project/META-INF folder, when I build it, also in project.war/META-INF
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    3. COActually I ment the place where your classes go, that is, where your folders `cz/cvut/fel/pupilbook/.../OneOfYourClasses.class` are placed. So, `META-INF` should go next to `cz` folder with compiled classes. If this doesn't work however, then I'm as confused as you are...
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