http状态500-使用jpa实体管理器工厂运行TomcatWeb服务器时出错

我正在尝试创建一个chatapp，其中jsp和jpa在tomcat服务器上运行，并使用mysql作为数据源。当我运行时，我得到以下错误。
web错误
这是eclipse控制台上的错误：
chatappjsp/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps
    dez. 06, 2020 3:45:54 DA TARDE org.apache.catalina.startup.VersionLoggerListener log
    INFO: Command line argument: -Dfile.encoding=UTF-8
    dez. 06, 2020 3:45:54 DA TARDE org.apache.catalina.startup.VersionLoggerListener log
    INFO: Command line argument: -XX:+ShowCodeDetailsInExceptionMessages
    dez. 06, 2020 3:45:54 DA TARDE org.apache.catalina.core.AprLifecycleListener lifecycleEvent
    INFO: The Apache Tomcat Native library which allows using OpenSSL was not found on the java.library.path: [/Users/Miguel/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
    dez. 06, 2020 3:45:55 DA TARDE org.apache.coyote.AbstractProtocol init
    INFO: Initializing ProtocolHandler ["http-nio-8080"]
    dez. 06, 2020 3:45:55 DA TARDE org.apache.catalina.startup.Catalina load
    INFO: Server initialization in [2543] milliseconds
    dez. 06, 2020 3:45:56 DA TARDE org.apache.catalina.core.StandardService startInternal
    INFO: Starting service [Catalina]
    dez. 06, 2020 3:45:56 DA TARDE org.apache.catalina.core.StandardEngine startInternal
    INFO: Starting Servlet engine: [Apache Tomcat/9.0.39]
    dez. 06, 2020 3:45:59 DA TARDE org.apache.jasper.servlet.TldScanner scanJars
    INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
    dez. 06, 2020 3:45:59 DA TARDE org.apache.coyote.AbstractProtocol start
    INFO: Starting ProtocolHandler ["http-nio-8080"]
    dez. 06, 2020 3:45:59 DA TARDE org.apache.catalina.startup.Catalina start
    INFO: Server startup in [3760] milliseconds
    dez. 06, 2020 3:52:08 DA TARDE org.apache.catalina.core.StandardWrapperValve invoke
    SEVERE: Servlet.service() for servlet [jsp] in context with path [/ChatAppJSP] threw exception [An exception occurred processing [Test.jsp] at line [15]

    12: </head>
    13: <body>
    14: <%
    15: EntityManager em = Test.emf.createEntityManager();
    16: User u = em.find(User.class, 1);
    17: %>
    18: <h1>The user is <%=u.getName() %></h1>

Stacktrace:] with root cause
Local Exception Stack: 
Exception [EclipseLink-7250] (Eclipse Persistence Services - 2.7.7.v20200504-69f2c2b80d): org.eclipse.persistence.exceptions.ValidationException
Exception Description: [class domain.Message] uses a non-entity [class int] as target entity in the relationship attribute [field messageId].
    at org.eclipse.persistence.exceptions.ValidationException.nonEntityTargetInRelationship(ValidationException.java:1383)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.RelationshipAccessor.getReferenceDescriptor(RelationshipAccessor.java:569)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.processDerivedId(ClassAccessor.java:1620)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processDerivedId(EntityAccessor.java:995)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processAccessorsWithDerivedIDs(MetadataProject.java:1610)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage3(MetadataProject.java:1907)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:584)
    at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:629)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:2006)
    at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:104)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:107)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:191)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:80)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
    at test.Test.<clinit>(Test.java:9)
    at org.apache.jsp.Test_jsp._jspService(Test_jsp.java:137)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:832)
jsp文件
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http状态500-使用jpa实体管理器工厂运行TomcatWeb服务器时出错

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