小编Gna*_*nam的帖子

我在requestScope中使用managedBean userHome,其中实体'user'将被保留.用户具有以ManyToOne关系映射的leader列.我的代码如下所示

@ManagedBean
@RequestScoped
public class UserHome {
    private User user = new User();
        // Getters and Setters

    private List<SelectItem> selectItems = new ArrayList<SelectItem>();

    public UserHome() {
        for(User user: availableLeaders) {
            selectItems.add(new SelectItem(user.getName(), user));
        }
    }

    public void persis();
}

User.java

public class User {
    @Id
    @Column
    private Integer id;

    @Column
    privat String name;

    @ManyToOne
    private User leader;
}

我试图通过h:selectOneMenu这样的方式获得这个领导者的价值

<h:selectOneMenu value="#{userHome.user.leader}" converter="userConverter">
    <f:selectItems value="#{userHome.selectItems}"/>
</h:selectOneMenu>

我的转换器看起来像这样

@FacesConverter(forClass = User.class, value="userConverter")
public class UserConverter implements …

我正在使用JPA项目开发一个hibernate,并尝试使用H2(嵌入式数据库)获取工作的persistence.xml.

persistence.xml中

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    version="1.0">

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

        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>entity.user</class>
        <properties>
           <property name="hibernate.connection.url" value="jdbc:h2:/~test" /> -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"></property>
            <property name="hibernate.connection.driver_class" value="org.h2.Driver" />
            <property name="hibernate.connection.password" value="admin" />
            <property name="hibernate.connection.username" value="admin" />
        </properties>
    </persistence-unit>
</persistence>

但是我的这个不起作用,我总是得到错误

"无法创建EntityManagerFactory"

EntityManagerFactory emf = Persistence.createEntityManagerFactory("DefaultPersistenceUnit");

.anyonw能为我提供工作的persistence.xml吗？

我正在使用JSF-2.1.2在apache-tomcat-7.0.16中运行我的应用程序.在faces-config.xml中添加导航规则后,我收到了NullPointerException.此错误已在JSF论坛中提交.JSF和tomcat应用服务器之间是否有任何兼容版本或任何解决方案？错误堆栈跟踪如下:

java.lang.NullPointerException
    at com.sun.faces.context.flash.ELFlash.loggingGetPhaseMapForReading(ELFlash.java:793)
    at com.sun.faces.context.flash.ELFlash.getPhaseMapForReading(ELFlash.java:826)
    at com.sun.faces.context.flash.ELFlash.isEmpty(ELFlash.java:484)
    at com.sun.faces.facelets.util.DevTools.writeVariables(DevTools.java:325)
    at com.sun.faces.facelets.util.DevTools.writeVariables(DevTools.java:215)
    at com.sun.faces.facelets.util.DevTools.debugHtml(DevTools.java:130)
    at com.sun.faces.renderkit.RenderKitUtils.renderHtmlErrorPage(RenderKitUtils.java:1159)
    at com.sun.faces.context.ExceptionHandlerImpl.throwIt(ExceptionHandlerImpl.java:269)
    at com.sun.faces.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:141)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
    at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:546)
    at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:364)
    at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:154)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Thread.java:662)

我正在尝试将Facelets 1.1.14的JSF 2.0应用程序部署到Tomcat7.我收到以下例外情况:

INFO: Initializing Mojarra 2.0.0 (FCS b23) for context '/AdminUI'

3 Aug, 2011 7:44:32 PM com.sun.faces.spi.InjectionProviderFactory createInstance

INFO: JSF1048: PostConstruct/PreDestroy annotations present.  ManagedBeans methods marked with these annotations will have said annotations processed.
3 Aug, 2011 7:44:33 PM com.sun.faces.config.ConfigManager initialized
INFO: Unsanitized stacktrace from failed start...
java.lang.NullPointerException
        at com.sun.faces.util.Util.loadClass(Util.java:200)
        at com.sun.faces.config.processor.AbstractConfigProcessor.loadClass(AbstractConfigProcessor.java:312)
        at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processHandlerClass(FaceletTaglibConfigProcessor.java:416)
        at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTags(FaceletTaglibConfigProcessor.java:370)
        at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary(FaceletTaglibConfigProcessor.java:313)
        at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.process(FaceletTaglibConfigProcessor.java:262)
        at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:337)
        at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:219)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
        at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
        at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at …

我有"用户"的JPA实体.我想使用maven hibernate3 Plugin为这个实体生成一个sql语句.我尝试使用/sf/ask/479858361/中配置的persistence.xml,但我的配置失败.如何使用任何简单数据库配置persistence.xml并访问使用maven hibernate3创建的表:hbm2ddl插件.