JPA时多项目同时运行时出现问题

Question

有两个项目A和B，在同一台服务器下，只单独部署A或者B时，运行都正常，若两个都部署，则先访问的运行正常，后访问的出现如下错误：
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: JPA] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)
at kop.api.jpa.EntityManagerUtil.(EntityManagerUtil.java:23)
 ...12 more
Caused by: org.hibernate.HibernateException: Could not instantiate connection provider: org.hibernate.connection.ProxoolConnectionProvider
at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:77)
at org.hibernate.ejb.InjectionSettingsFactory.createConnectionProvider(InjectionSettingsFactory.java:29)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:62)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
 ...16 more
请问是啥原因？？？？？

Answer 1

很明显问题在构建：EntityManagerFactory的时候出现，你代码太少了，关注下你配置EntityManagerFactory 的代码。。贴上来看看

Answer 2

persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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">
  <persistence-unit name="JPA" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <non-jta-data-source/>
    <class>.......</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.proxool.pool_alias" value="pool"/>
      <property name="hibernate.proxool.xml" value="Proxool.xml"/>
      <property name="hibernate.connection.provider_class" value="org.hibernate.connection.ProxoolConnectionProvider"/>
      <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>
      <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>
      <property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>
      <property name="hibernate.show_sql" value="false"/>
    </properties>
  </persistence-unit>
</persistence>Proxool.xml
<?xml version="1.0" encoding="utf-8"?>
<something-else-entirely>
<proxool>
    <alias>pool</alias>
    <driver-url>jdbc:oracle:thin:@localhost:1521:test</driver-url>
    <driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
    <driver-properties>
        <property name="user" value="test"/>
        <property name="password" value="test"/>
    </driver-properties>
    
    <house-keeping-sleep-time>90000</house-keeping-sleep-time>
 
    <maximum-new-connections>20</maximum-new-connections>
    
    <prototype-count>5</prototype-count>    <maximum-connection-count>100</maximum-connection-count>
    
    <minimum-connection-count>10</minimum-connection-count>
</proxool>
</something-else-entirely> 创建EntityManagerFactory代码：

EntityManagerFactory emf;
emf = Persistence.createEntityManagerFactory("JPA");
EntityManager manager= emf.createEntityManager();

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