我配置了,我使用Datanucleus JPA连接到MySQL。我用datanucleus-enhancer-plugin编译类和增强的实体。我可以使用mvn exec:java来运行我的应用程序,并且我也可以在使用lib(jar依赖项)创建存档后运行它。Datanucleus RDBMS JPA jar-with-dependencues
当我创建一个jar(jar-with-dependencies)时出现这个问题。我得到这个错误:
javax.persistence.PersistenceException: Explicit persistence provider error(s) occurred for "mysql" after trying the following discovered implementations: org.datanucleus.api.jpa.PersistenceProviderImpl from provider: org.datanucleus.api.jpa.PersistenceProviderImpl
at javax.persistence.Persistence.createPersistenceException(Persistence.java:244)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:186)
at cantina.crawler.util.JpaUtil.getRdbmsEntityManager(JpaUtil.java:29)
at cantina.crawler.bolt.SiteDetectorBolt.prepare(SiteDetectorBolt.java:32)
at backtype.storm.daemon.executor$fn__4050$fn__4059.invoke(executor.clj:610)
at backtype.storm.util$async_loop$fn__465.invoke(util.clj:375)
at clojure.lang.AFn.run(AFn.java:24)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.datanucleus.exceptions.NucleusException: Error creating handler of type "persistence" for metadata parsing : MetaData handler plugin "persistence" was not found. Please check your CLASSPATH and plugin specification.
at org.datanucleus.metadata.xml.MetaDataParser.parseMetaDataStream(MetaDataParser.java:269)
at org.datanucleus.metadata.xml.MetaDataParser.parseMetaDataURL(MetaDataParser.java:137)
at org.datanucleus.metadata.MetaDataUtils.parsePersistenceFiles(MetaDataUtils.java:956)
at org.datanucleus.api.jpa.JPAEntityManagerFactory.<init>(JPAEntityManagerFactory.java:342)
at org.datanucleus.api.jpa.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:91)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:152)
... 6 more
Caused by: org.datanucleus.exceptions.NucleusUserException: MetaData handler plugin "persistence" was not found. Please check your CLASSPATH and plugin specification.
at org.datanucleus.metadata.xml.MetaDataParser.parseMetaDataStream(MetaDataParser.java:263)
... 11 more
我unziped的jar和datanucleus核心文件在那里。我无法弄清楚发生了什么事。
你会发现最终的解决方案? – Campa 2017-07-19 15:12:57