我是这个论坛的新手，也是 JPA / EJB 的新手。
我正在尝试将包含小型应用程序的 .war 文件部署到 tomcat 服务器。该应用程序使用 JTA 与 Derby 数据库进行通信。
当我在 eclipse 中运行的 tomcat 服务器上运行和部署应用程序时，一切都工作正常，但是当我导出 .war 文件并尝试浏览应用程序时，它会抛出 java.lang.ClassNotFoundException: javax.persistence.PersistenceException 。
我的持久性文件如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="1.0">
<persistence-unit name="lab1" transaction-type="RESOURCE_LOCAL">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<!--<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>-->
<class>entity.Team</class>
<class>entity.Gambler</class>
<class>entity.Bet</class>
<class>entity.Game</class>
<class>entity.Gameday</class>
<properties>
<property name="openjpa.ConnectionURL" value="jdbc:derby://localhost:1527/hean0901;create=true"/>
<property name="openjpa.ConnectionDriverName" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="openjpa.ConnectionUserName" value="lab1"/>
<property name="openjpa.ConnectionPassword" value="user"/>
<property name="lab1.log" value="DefaultLevel=TRACE"/>
<property name="nonTransactionalDataSource" value="true"/>
<!-- <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>-->
<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema" />
<property name="eclipselink.logging.level" value="FINEST"/>
</properties>
</persistence-unit>
</persistence>
抛出的错误如下所示：
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 1
1: <jsp:forward page="Setupcheck.do" />
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:401)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:706)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:677)
org.apache.jsp.index_jsp._jspService(index_jsp.java:54)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.NoClassDefFoundError: javax/persistence/PersistenceException
model.Setupcheck.processRequest(Setupcheck.java:31)
model.Setupcheck.doGet(Setupcheck.java:43)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:706)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:677)
org.apache.jsp.index_jsp._jspService(index_jsp.java:54)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.ClassNotFoundException: javax.persistence.PersistenceException
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
model.Setupcheck.processRequest(Setupcheck.java:31)
model.Setupcheck.doGet(Setupcheck.java:43)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:706)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:677)
org.apache.jsp.index_jsp._jspService(index_jsp.java:54)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
以前有人遇到过这种情况吗？
此致
亨里克
您似乎缺少 javax.persistence.PersistenceException 类（JPA 规范的一部分）。
Java Persistence API JAR（包含 PersistenceException 类）可以在这里找到：
http://repo1.maven.org/maven2/javax/persistence/persistence-api/1.0/persistence-api-1.0.jar http://repo1.maven.org/maven2/javax/persistence/persistence-api/1.0/persistence-api-1.0.jar
该 JAR 需要位于您的 WEB-INF/lib 文件夹中。
根据您设置 Eclipse 的方式，它可能会自动将这些 JAR 推送到 Tomcat（通过定义库）。
然而，它尝试加载 PersistenceException 的事实很可能意味着一旦解决了这个 ClassNotFoundException，就会发生另一个异常（真正的异常）。
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