Question

大家好，所以我正在Vaadin / GWT做我的第一步，我发现也许我没有得到一些其统治或其他的机制。首先，我在仪表板上进行了修改 - 演示，你可以在这里查看 - ＆gt; https://github.com/vaadin/dashboard-demo

我试图从我的数据库中获取一些数据。我在spring项目中经常使用JPA所以我配置了所有属性，但只是为了确保这是我的persistance.xml：

http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" 版本=＆＃34; 2.0＆＃34;＆GT;

<persistence-unit name="transactionUnit" transaction-type="RESOURCE_LOCAL">

    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>


    <properties>
        <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
        <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/testDb?UseUnicode=true&amp;characterEncoding=utf8" />
        <property name="javax.persistence.jdbc.user" value="root" />
        <property name="javax.persistence.jdbc.password" value="root" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        <property name="hibernate.show_sql" value="true" />
        <property name="hibernate.hbm2ddl.auto" value="create" />
    </properties>

</persistence-unit>

我还有一些非常简单的用户类：

@Entity(name = "USERS")
public class UserImpl implements User, java.io.Serializable {

    /**
     *
     */
    private static final long serialVersionUID = -7872836283108223143L;

    @Id
    @Column(name = "USER_ID")
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected Long id;

    @Column(name = "USERNAME", unique = true)
    protected String username;

    @Column(name = "FIRST_NAME")
    protected String firstName;

    @Column(name = "LAST_NAME")
    protected String lastName;

    @Column(name = "EMAIL")
    protected String email;

    @Column(name = "PHONE_NUMBER")
    protected String phoneNumber;

    @Column(name = "PASSWORD")
    protected String password;

    @Column(name = "ENABLED")
    protected boolean active;

    @Override
    public Long getId() {
        return id;
    }

    @Override
    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public String getUsername() {
        return username;
    }

    @Override
    public void setUsername(String username) {
        this.username = username;
    }

    @Override
    public String getPassword() {
        return password;
    }

    @Override
    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public boolean isActive() {
        return active;
    }

    @Override
    public void setActive(boolean active) {
        this.active = active;
    }

    @Override
    public String getFirstName() {
        return firstName;
    }

    @Override
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    @Override
    public String getLastName() {
        return lastName;
    }

    @Override
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Override
    public String getEmail() {
        return email;
    }

    @Override
    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String getPhoneNumber() {
        return phoneNumber;
    }

    @Override
    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }


}

并指出我有这样的方法（也简单UBER）：

@Subscribe

public void userLoginRequested(final UserLoginRequestedEvent event) {

EntityManager em = Persistence
        .createEntityManagerFactory("transactionUnit")
        .createEntityManager();

TypedQuery<com.vaadin.demo.dashboard.domain.classes.UserImpl> query = em.createQuery("SELECT user FROM com.vaadin.demo.dashboard.domain.classes.UserImpl user WHERE LOWER(username) = :username", com.vaadin.demo.dashboard.domain.classes.UserImpl.class);
com.vaadin.demo.dashboard.domain.classes.UserImpl testUser;

testUser = query.getSingleResult();

User user = getDataProvider().authenticate(event.getUserName(),
        event.getPassword());
VaadinSession.getCurrent().setAttribute(User.class.getName(), user);;

}

方法应该简单地返回对象但是没有我有这样的错误：

[EL Info]：2015-11-24 15：43：16.62 - ServerSession（1650623529） - EclipseLink，版本：Eclipse 持久性服务 - 2.2.0.v20110202-r8913 [EL Info]：2015-11-24 15：43：16.797 - 的ServerSession（1650623529） - 文件：/ d：/Serwery/apache-tomcat-8.0.15/webapps/ROOT/WEB-INF/classes/_transactionUnit 登录成功lis 24,2015 3:43:16 PM com.vaadin.server.DefaultErrorHandler doDefault SEVERE： java.lang.NoSuchMethodError： javax.persistence.EntityManager.createQuery（Ljava /郎/字符串; Ljava /郎/类;）Ljavax /持久/ TypedQuery; 在 com.vaadin.demo.dashboard.DashboardUI.userLoginRequested（DashboardUI.java:103） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:497）at com.google.common.eventbus.EventSubscriber.handleEvent（EventSubscriber.java:74）在 com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent（SynchronizedEventSubscriber.java:47）在com.google.common.eventbus.EventBus.dispatch（EventBus.java:322）在 com.google.common.eventbus.EventBus.dispatchQueuedEvents（EventBus.java:304）在com.google.common.eventbus.EventBus.post（EventBus.java:275）at com.vaadin.demo.dashboard.event.DashboardEventBus.post（DashboardEventBus.java:17）在 com.vaadin.demo.dashboard.view.LoginView $ 1.buttonClick（LoginView.java:102） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:497）at com.vaadin.event.ListenerMethod.receiveEvent（ListenerMethod.java:508）在com.vaadin.event.EventRouter.fireEvent（EventRouter.java:198）at com.vaadin.event.EventRouter.fireEvent（EventRouter.java:161）at com.vaadin.server.AbstractClientConnector.fireEvent（AbstractClientConnector.java:1003）在com.vaadin.ui.Button.fireClick（Button.java:393）at com.vaadin.ui.Button $ 1.click（Button.java:61）at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:497）at com.vaadin.server.ServerRpcManager.applyInvocation（ServerRpcManager.java:158）在 com.vaadin.server.ServerRpcManager.applyInvocation（ServerRpcManager.java:118）在 com.vaadin.server.communication.ServerRpcHandler.handleInvocations（ServerRpcHandler.java:313）在 com.vaadin.server.communication.ServerRpcHandler.handleRpc（ServerRpcHandler.java:202）在 com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest（UidlRequestHandler.java:95）在 com.vaadin.server.SynchronizedRequestHandler.handleRequest（SynchronizedRequestHandler.java:41）在 com.vaadin.server.VaadinService.handleRequest（VaadinService.java:1408）在com.vaadin.server.VaadinServlet.service（VaadinServlet.java:351）在javax.servlet.http.HttpServlet.service（HttpServlet.java:725）at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:291）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在 org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:219）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:501）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:142）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）在 org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:610）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:88）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:537）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1085）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:658）在 org.apache.coyote.http11.Http11NioProtocol $ Http11ConnectionHandler.process（Http11NioProtocol.java:222）在 org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1556）在 org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1513）在 java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:617）在 org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.lang.Thread.run（Thread.java:745）

问题是我的做法有什么问题？

Answer 1

您的类路径中是否是正确的java持久性版本？

您尝试调用的createQuery方法自版本2.0起首次可用

/**
* @since Java Persistence 2.0
*/
public <T> TypedQuery<T> createQuery(CriteriaQuery<T> criteriaQuery);

如果您使用maven，请执行以下操作：

<dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>javax.persistence</artifactId>
    <version>2.1.0</version>
</dependency>

不喜欢：

<dependency>
    <groupId>javax.persistence</groupId>
    <artifactId>persistence-api</artifactId>
    <version>1.0.2</version>
</dependency>

Vaadin EntityManager - createQuery不起作用吗？

1 个答案: