Maven/Eclipse: Could not find any META-INF/persistence.xml file in the classpath

I know there are other questions on SO about this issue, but none of the solutions have worked for me. I'm using maven to build a java project in eclipse, and I have my persistence.xml file in the src/main/resource/META_INF folder. But when I try to mvn install, I always get this error: ``` No Persistence provider for EntityManager named plasma.persistence ``` Looking through the console output it appears to be caused by this: ``` [org.hibernate.jpa.boot.internal.PersistenceXmlParser] - HHH000318: Could not find any META-INF/persistence.xml file in the classpath ``` Here is my persistence.xml file: ``` <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_2_0.xsd" version="2.0"> <persistence-unit name="plasma.persistence" transaction-type="RESOURCE_LOCAL"> <properties> <property name="hibernate.dialect" value="org.hibernate.spatial.dialect.postgis.PostgisDialect"/> <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/> <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432:xxxxx"/> <property name="hibernate.connection.username" value="xxxxx"/> <property name="hibernate.connection.password" value="xxxxx"/> <property name="hibernate.connection.pool_size" value="5"/> <property name="hibernate.show_sql" value="true"/> <property name="hibernate.format_sql" value="true"/> <property name="hibernate.max_fetch_depth" value="5"/> <property name="hibernate.hbm2ddl.auto" value="update"/> </properties> </persistence-unit> ``` I have tried right clicking on the project and adding the META_INF folder to the build path, and it still doesn't work. Any ideas?