造成的：javax.persistence.PersistenceException：否EntityManager的持久性提供者命名的本地

Question

當我跑我的RCP應用程序我得到的錯誤信息：

Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named local 
at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) 
at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) 

我對EclipseLink的持久性API和jar文件Derby JDBC驅動程序在我的類路徑，並 包含在我的MANIFEST.MF：

Manifest-Version: 1.0 
Require-Bundle: org.eclipse.ui, 
org.eclipse.core.runtime, 
org.eclipse.ui.forms;bundle-version="3.5.100", 
javax.servlet;bundle-version="2.5.0", 
com.caucho.hessian;bundle-version="3.0.8", 
org.apache.commons.lang;bundle-version="2.1.0", 
org.eclipse.persistence.core;bundle-version="2.4.0", 
org.eclipse.persistence.jpa;bundle-version="2.4.0", 
org.eclipse.persistence.asm;bundle-version="3.3.1", 
javax.persistence;bundle-version="2.0.4", 
workstation_dependencies;bundle-version="1.0.0", -- THIS IS A CUSTOM DEPS PACKAGE 
org.apache.derby;bundle-version="10.5.1" 
Bundle-Vendor: MYVENDOR 
Bundle-ActivationPolicy: lazy 
Bundle-Version: 1.0.0.20120319 
Bundle-Name: MYBUNDLE 
Bundle-Activator: foo.myrcpapp.Activator 
Bundle-ManifestVersion: 2 
Bundle-SymbolicName: foo.myrcpapp; 
singleton:=true 
Bundle-RequiredExecutionEnvironment: JavaSE-1.6 
Eclipse-RegisterBuddy: com.caucho.hessian 
JPA-PersistenceUnits: local 
Meta-Persistence: META-INF/persistence.xml 
Bundle-ClassPath: lib/commonj.sdo_2.1.1.v201112051852.jar, 
lib/commonj.sdo.source_2.1.1.v201112051852.jar, 
lib/derby-10.8.2.2.jar, 
lib/eclipselink-jpa-modelgen_2.4.0.v20120608-r11652.jar, 
lib/javax.activation_1.1.0.v201108011116.jar, 
lib/javax.ejb_3.1.0.v201205171433.jar, 
lib/javax.jms_1.1.0.v200906010428.jar, 
lib/javax.mail_1.4.0.v201005080615.jar, 
lib/javax.persistence_1.0.0.v200905011740.jar, 
lib/javax.persistence_2.0.4.v201112161009.jar, 
lib/javax.persistence.source_2.0.4.v201112161009.jar, 
lib/javax.resource_1.5.0.v200906010428.jar, 
lib/javax.servlet_2.4.0.v200806031604.jar, 
lib/javax.transaction_1.1.0.v201002051055.jar, 
lib/javax.ws.rs_1.1.1.v20101004-1200.jar, 
lib/javax.ws.rs.source_1.1.1.v20101004-1200.jar, 
lib/javax.wsdl_1.6.2.v201012040545.jar, 
lib/javax.xml.bind_2.2.0.v201105210648.jar, 
lib/javax.xml.bind.source_2.2.0.v201005080402.jar, 
lib/javax.xml.soap_1.3.0.v200906010428.jar, 
lib/javax.xml.stream_1.0.1.v201004272200.jar, 
lib/javax.xml.ws_2.0.0.v200902170419.jar, 
lib/org.eclipse.orbit.mongodb_2.7.3.v20120213-1927.jar, 
lib/org.eclipse.persistence.antlr_3.2.0.v201206041011.jar, 
lib/org.eclipse.persistence.antlr.source_3.2.0.v201206041011.jar, 
lib/org.eclipse.persistence.asm_3.3.1.v201206041142.jar, 
lib/org.eclipse.persistence.asm.source_3.3.1.v201206041142.jar, 
lib/org.eclipse.persistence.core_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.core.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.dbws_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.dbws.builder_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.dbws.builder.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.dbws.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.equinox_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.equinox.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.equinox.weaving_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.equinox.weaving.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.jpql_2.0.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.jpql.source_2.0.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.modelgen_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.modelgen.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.osgi_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.osgi.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpa.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpars_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.jpars.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.moxy_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.moxy.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.nosql_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.nosql.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.oracle_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.oracle.nosql_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.oracle.nosql.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.oracle.source_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.oracleddlparser_1.0.0.v20120530.jar, 
lib/org.eclipse.persistence.oracleddlparser.source_1.0.0.v20120530.jar, 
lib/org.eclipse.persistence.sdo_2.4.0.v20120608-r11652.jar, 
lib/org.eclipse.persistence.sdo.source_2.4.0.v20120608-r11652.jar, 
. 

我的persistence.xml看起來是這樣的：

<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" xmlns="http://java.sun.com/xml/ns/persistence"> 

<persistence-unit name="local" transaction-type="RESOURCE_LOCAL"> 
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> 

    <class>foo.Bar</class> 

    <properties> 
     <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" /> 
     <property name="javax.persistence.jdbc.url" value="jdbc:derby:mydb;create=true" /> 
     <property name="javax.persistence.jdbc.user" value="username" /> 
     <property name="javax.persistence.jdbc.password" value="passwd" /> 

     <property name="eclipselink.persistence-context.persist-on-commit" value="true"/> 

     <!-- EclipseLink should create the database schema automatically --> 
     <property name="eclipselink.ddl-generation" value="create-tables" /> 
     <property name="eclipselink.ddl-generation.output-mode" 
      value="database" /> 
    </properties> 
    </persistence-unit> 
</persistence> 

我試着在persistence.xml中放入隨機亂碼垃圾並得到了相同的結果，所以我不確定它是否被拾取。 persistence.xml位於項目根目錄下的META-INF文件夾中，並且我試圖將META-INF文件夾複製到各個位置而不做任何更改。

任何想法？

提前歡呼。

Answer 1

這些例子可能會有幫助，

http://wiki.eclipse.org/EclipseLink/Examples/OSGi