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为什么没有看到数据库中的更新?
原标题：Why tomcat does not see the update in the database?

我目前是净户,正在开发一个带java的网络应用程序。 我使用JPA2.0和H2数据库。

The problem is that when I change the data in the database and I reloaded the page in the browser=>no change is set. Only if I rerun a jsp page in netbeans, or I restart tomcat:

网络:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>ajoutAutomobile</servlet-name>
        <servlet-class>controlleurs.ajoutAutomobile</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutConducteur</servlet-name>
        <servlet-class>controlleurs.ajoutConducteur</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutMission</servlet-name>
        <servlet-class>controlleurs.ajoutMission</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutUtilisateur</servlet-name>
        <servlet-class>controlleurs.ajoutUtilisateur</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectCinConducteur</servlet-name>
        <servlet-class>controlleurs.selectCinConducteur</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectIdAuto</servlet-name>
        <servlet-class>controlleurs.selectIdAuto</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectIdAutomobile</servlet-name>
        <servlet-class>controlleurs.selectIdAutomobile</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutVignette</servlet-name>
        <servlet-class>controlleurs.ajoutVignette</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectImei</servlet-name>
        <servlet-class>controlleurs.selectImei</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutAssurance</servlet-name>
        <servlet-class>controlleurs.ajoutAssurance</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutVisite</servlet-name>
        <servlet-class>controlleurs.ajoutVisite</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutIntervention</servlet-name>
        <servlet-class>controlleurs.ajoutIntervention</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectAutoLibre</servlet-name>
        <servlet-class>controlleurs.selectAutoLibre</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectConducteurLibre</servlet-name>
        <servlet-class>controlleurs.selectConducteurLibre</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>afficheInfoGeo</servlet-name>
        <servlet-class>controlleurs.afficheInfoGeo</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ajoutAffectation</servlet-name>
        <servlet-class>controlleurs.ajoutAffectation</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>afficheListConducteur</servlet-name>
        <servlet-class>controlleurs.afficheListConducteur</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>afficheInfoGeoRestreinte</servlet-name>
        <servlet-class>controlleurs.afficheInfoGeoRestreinte</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectDate</servlet-name>
        <servlet-class>controlleurs.selectDate</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectCoordsRestreinte</servlet-name>
        <servlet-class>controlleurs.selectCoordsRestreinte</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectAssuranceExpir</servlet-name>
        <servlet-class>controlleurs.selectAssuranceExpir</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectVignetteExpir</servlet-name>
        <servlet-class>controlleurs.selectVignetteExpir</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectVisiteExpir</servlet-name>
        <servlet-class>controlleurs.selectVisiteExpir</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectAssurance</servlet-name>
        <servlet-class>controlleurs.selectAssurance</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectVignette</servlet-name>
        <servlet-class>controlleurs.selectVignette</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>selectVisite</servlet-name>
        <servlet-class>controlleurs.selectVisite</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>afficheListAutomobile</servlet-name>
        <servlet-class>controlleurs.afficheListAutomobile</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>historiqueAffectationConducteur</servlet-name>
        <servlet-class>controlleurs.historiqueAffectationConducteur</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>historiqueAffectationAutomobile</servlet-name>
        <servlet-class>controlleurs.historiqueAffectationAutomobile</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ajoutAutomobile</servlet-name>
        <url-pattern>/ajoutAutomobile</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutConducteur</servlet-name>
        <url-pattern>/ajoutConducteur</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutMission</servlet-name>
        <url-pattern>/ajoutMission</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutUtilisateur</servlet-name>
        <url-pattern>/ajoutUtilisateur</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectCinConducteur</servlet-name>
        <url-pattern>/selectCinConducteur</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectIdAuto</servlet-name>
        <url-pattern>/selectIdAuto</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectIdAutomobile</servlet-name>
        <url-pattern>/selectIdAutomobile</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutVignette</servlet-name>
        <url-pattern>/ajoutVignette</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectImei</servlet-name>
        <url-pattern>/selectImei</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutAssurance</servlet-name>
        <url-pattern>/ajoutAssurance</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutVisite</servlet-name>
        <url-pattern>/ajoutVisite</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutIntervention</servlet-name>
        <url-pattern>/ajoutIntervention</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectAutoLibre</servlet-name>
        <url-pattern>/selectAutoLibre</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectConducteurLibre</servlet-name>
        <url-pattern>/selectConducteurLibre</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>afficheInfoGeo</servlet-name>
        <url-pattern>/afficheInfoGeo</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ajoutAffectation</servlet-name>
        <url-pattern>/ajoutAffectation</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>afficheListConducteur</servlet-name>
        <url-pattern>/afficheListConducteur</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>afficheInfoGeoRestreinte</servlet-name>
        <url-pattern>/afficheInfoGeoRestreinte</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectDate</servlet-name>
        <url-pattern>/selectDate</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectCoordsRestreinte</servlet-name>
        <url-pattern>/selectCoordsRestreinte</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectAssuranceExpir</servlet-name>
        <url-pattern>/selectAssuranceExpir</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectVignetteExpir</servlet-name>
        <url-pattern>/selectVignetteExpir</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectVisiteExpir</servlet-name>
        <url-pattern>/selectVisiteExpir</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectAssurance</servlet-name>
        <url-pattern>/selectAssurance</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectVignette</servlet-name>
        <url-pattern>/selectVignette</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>selectVisite</servlet-name>
        <url-pattern>/selectVisite</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>afficheListAutomobile</servlet-name>
        <url-pattern>/afficheListAutomobile</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>historiqueAffectationConducteur</servlet-name>
        <url-pattern>/historiqueAffectationConducteur</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>historiqueAffectationAutomobile</servlet-name>
        <url-pattern>/historiqueAffectationAutomobile</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
           30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

服务器:

<?xml version= 1.0  encoding= utf-8 ?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<!-- Note:  A "Server" is not itself a "Container", so you may not
     define subcomponents such as "Valves" at this level.
     Documentation at /docs/config/server.html
 -->
<Server port="8005" shutdown="SHUTDOWN">

  <!--APR library loader. Documentation at /docs/apr.html -->
  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
  <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
  <Listener className="org.apache.catalina.core.JasperListener" />
  <!-- Prevent memory leaks due to use of particular java/javax APIs-->
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
  <!-- JMX Support for the Tomcat server. Documentation at /docs/non-existent.html -->
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />

  <!-- Global JNDI resources
       Documentation at /docs/jndi-resources-howto.html
  -->
  <GlobalNamingResources>
    <!-- Editable user database that can also be used by
         UserDatabaseRealm to authenticate users
    -->
    <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />
  </GlobalNamingResources>

  <!-- A "Service" is a collection of one or more "Connectors" that share
       a single "Container" Note:  A "Service" is not itself a "Container", 
       so you may not define subcomponents such as "Valves" at this level.
       Documentation at /docs/config/service.html
   -->
  <Service name="Catalina">

    <!--The connectors can use a shared executor, you can define one or more named thread pools-->
    <!--
    <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" 
        maxThreads="150" minSpareThreads="4"/>
    -->


    <!-- A "Connector" represents an endpoint by which requests are received
         and responses are returned. Documentation at :
         Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
         Java AJP  Connector: /docs/config/ajp.html
         APR (HTTP/AJP) Connector: /docs/apr.html
         Define a non-SSL HTTP/1.1 Connector on port 8080
    -->
    <Connector port="8080" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" />
    <!-- A "Connector" using the shared thread pool-->
    <!--
    <Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" />
    -->           
    <!-- Define a SSL HTTP/1.1 Connector on port 8443
         This connector uses the JSSE configuration, when using APR, the 
         connector should be using the OpenSSL style configuration
         described in the APR documentation -->
    <!--
    <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
               maxThreads="150" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />


    <!-- An Engine represents the entry point (within Catalina) that processes
         every request.  The Engine implementation for Tomcat stand alone
         analyzes the HTTP headers included with the request, and passes them
         on to the appropriate Host (virtual host).
         Documentation at /docs/config/engine.html -->

    <!-- You should set jvmRoute to support load-balancing via AJP ie :
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">         
    --> 
    <Engine name="Catalina" defaultHost="localhost">

      <!--For clustering, please take a look at documentation at:
          /docs/cluster-howto.html  (simple how to)
          /docs/config/cluster.html (reference documentation) -->
      <!--
      <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
      -->        

      <!-- The request dumper valve dumps useful debugging information about
           the request and response data received and sent by Tomcat.
           Documentation at: /docs/config/valve.html -->
      <!--
      <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
      -->

      <!-- This Realm uses the UserDatabase configured in the global JNDI
           resources under the key "UserDatabase".  Any edits
           that are performed against this UserDatabase are immediately
           available for use by the Realm.  -->
      <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
             resourceName="UserDatabase"/>

      <!-- Define the default virtual host
           Note: XML Schema validation will not work with Xerces 2.2.
       -->
      <Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">

        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"  
               prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
        -->

      </Host>
    </Engine>
  </Service>
</Server>

如何解决这一问题?

EDIT: I have tried to delete cache, also open the page in other browser =>same result..

EDIT2: persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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_2_0.xsd">
  <persistence-unit name="webPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>entities.Automobile</class>
    <class>entities.Intervention</class>
    <class>entities.Assurance</class>
    <class>entities.Coordonnees</class>
    <class>entities.Mission</class>
    <class>entities.Affectation</class>
    <class>entities.Conducteur</class>
    <class>entities.Gps</class>
    <class>entities.Vignette</class>
    <class>entities.Utilisateur</class>
    <class>entities.VisiteTechnique</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:h2:tcp://localhost/~/ApiGps"/>
      <property name="javax.persistence.jdbc.password" value=""/>
      <property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
      <property name="javax.persistence.jdbc.user" value="sa"/>
    </properties>
  </persistence-unit>
</persistence>

我的保留:

response.setContentType("application/json");

        PrintWriter out = response.getWriter();
        EntityManagerFactory emf=Persistence.createEntityManagerFactory("webPU"); 


       Timestamp nd=new Timestamp(System.currentTimeMillis());//now
       nd.setMinutes(nd.getMinutes()-20);
      EntityManager em=emf.createEntityManager();
      String req="select a from Automobile a where a.gpsImei.imei in (SELECT c.gpsImei.imei FROM Coordonnees c WHERE c.date < :nd )";
      Query resultat=em.createQuery(req);
      resultat.setParameter("nd", nd);
      java.util.List<Automobile> la= resultat.getResultList();  
      Gson gson=new Gson();
      String json =gson.toJson(La);//convert the List to json

      try {
        out.println(json);//return respons to ajax
       } finally {            
        out.close();
       }
最佳回答

由于您正在使用<条码> 交易类型=“资源CE_LOCAL>。

你们总是只想使用一个实体。 在你的申请中,有一个管理同一实体管理情况的家长班。

It is almost never a good idea to have more than one instance of an EntityManager in use (don t create a second one unless you ve destroyed the first)

我认为,问题在于在这里建立一个新的欧安会。

EntityManager em=emf.createEntityManager();

在个人方面,我倾向于使用交易类型,交易类型=“运输”,而不是对实体经理的担忧:

http://openejb.apache.org/jpa-concepts.html” rel=“nofollow noretinger” http://openejb.apache.org/jpa-concepts.html

当你拯救数据时,你会使用拯救或合并的方式?

这可能不是正确的答案,但我希望它会有所帮助。

时间：2012-05-01 16:31:42
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