Question

我试图通过命令按钮将主键“userId”作为EL方法参数发送到我的托管bean来删除数据库条目。

我当前的代码看起来像

豆：

@ManagedBean
@RequestScoped
public class HibernateUserHandling 
{
...
public void deleteUser(String userIdViaXhtml)
{
    Session session = sessionFactory.openSession();
    session.beginTransaction();

    session.createQuery("DELETE FROM AddressDetails WHERE USERID = :userIdViaXhtml");
    session.createQuery("DELETE FROM UserDetails WHERE USERID = :userIdViaXhtml");

    session.getTransaction().commit();
    session.close();
}
...
}

查看：

    <html>
    <body>
        <ui:composition template="./generalTemplate.xhtml"
        xmlns="http://www.w3.org/1999/xhtml"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:ui="http://java.sun.com/jsf/facelets">
        <ui:define name="content">
            <h:outputStylesheet library="css" name="cssHibernate.css" />
                <h:form id="main">
                    <h:dataTable value="#{hibernateDataOutput.persons}" var="list"
                                styleClass="order-table"
                                headerClass="order-table-header"
                                rowClasses="order-table-odd-row,order-table-even-row">
                        ...
                            <f:facet name="header">Delete</f:facet>
                            <h:commandButton id="userId" action="#{hibernateUserHandling['deleteUser(list.userId)']}" image="delete.jpg" />
                        </h:column>
                    </h:dataTable>
                    ...
                </h:form>
            </ui:define>
        </ui:composition>
    </body>
</html>

我测试了更多方法，例如通过像在inputText中那样将值传递给bean中的单独变量，但没有任何效果。

我认为我的基本方法完全错误。

我收到以下错误：

/hibernate.xhtml @39,137 action="#{hibernateUserHandling.deleteUser(list.userId)}" Failed to parse the expression [#{hibernateUserHandling.deleteUser(list.userId)}]

堆栈追踪：

    javax.faces.view.facelets.TagAttributeException: /hibernate.xhtml @39,137 action="#{hibernateUserHandling.deleteUser(list.userId)}" Failed to parse the expression [#{hibernateUserHandling.deleteUser(list.userId)}]
            at com.sun.faces.facelets.tag.TagAttributeImpl.getMethodExpression(TagAttributeImpl.java:232)
            at com.sun.faces.facelets.tag.jsf.ActionSourceRule$ActionMapper2.applyMetadata(ActionSourceRule.java:104)
            at com.sun.faces.facelets.tag.MetadataImpl.applyMetadata(MetadataImpl.java:81)
            at javax.faces.view.facelets.MetaTagHandler.setAttributes(MetaTagHandler.java:129)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.setAttributes(DelegatingMetaTagHandler.java:102)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.doNewComponentActions(ComponentTagHandlerDelegateImpl.java:402)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:159)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at com.sun.faces.facelets.tag.ui.DefineHandler.applyDefinition(DefineHandler.java:103)
            at com.sun.faces.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:178)
            at com.sun.faces.facelets.impl.DefaultFaceletContext$TemplateManager.apply(DefaultFaceletContext.java:395)
            at com.sun.faces.facelets.impl.DefaultFaceletContext.includeDefinition(DefaultFaceletContext.java:366)
            at com.sun.faces.facelets.tag.ui.InsertHandler.apply(InsertHandler.java:108)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
            at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188)
            at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
            at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
            at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:86)
            at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:308)
            at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:367)
            at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:346)
            at com.sun.faces.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:199)
            at com.sun.faces.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:155)
            at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
            at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:86)
            at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:152)
            at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:769)
            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:410)
            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:293)
            at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:877)
            at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:594)
            at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1675)
            at java.lang.Thread.run(Thread.java:619)
    Caused by: javax.el.ELException: Failed to parse the expression [#{hibernateUserHandling.deleteUser(list.userId)}]
            at org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:146)
            at org.apache.el.lang.ExpressionBuilder.build(ExpressionBuilder.java:172)
            at org.apache.el.lang.ExpressionBuilder.createMethodExpression(ExpressionBuilder.java:223)
            at org.apache.el.ExpressionFactoryImpl.createMethodExpression(ExpressionFactoryImpl.java:57)
            at com.sun.faces.facelets.tag.TagAttributeImpl.getMethodExpression(TagAttributeImpl.java:222)
            ... 61 more
    Caused by: org.apache.el.parser.ParseException: Encountered " "(" "( "" at line 1, column 35.
    Was expecting one of:
        "}" ...
        "." ...
        "[" ...
        ">" ...
        "gt" ...
        "<" ...
        "lt" ...
        ">=" ...
        "ge" ...
        "<=" ...
        "le" ...
        "==" ...
        "eq" ...
        "!=" ...
        "ne" ...
        "&&" ...
        "and" ...
        "||" ...
        "or" ...
        "*" ...
        "+" ...
        "-" ...
        "/" ...
        "div" ...
        "%" ...
        "mod" ...

            at org.apache.el.parser.ELParser.generateParseException(ELParser.java:2142)
            at org.apache.el.parser.ELParser.jj_consume_token(ELParser.java:2024)
            at org.apache.el.parser.ELParser.DeferredExpression(ELParser.java:113)
            at org.apache.el.parser.ELParser.CompositeExpression(ELParser.java:40)
            at org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:114)
            ... 65 more

Answer 1

您的Facelet构图错误。在最终视图中忽略<ui:composition>之外的任何内容，模板客户端内容需要进入<ui:define>。您在<h:form> 外面模板定义<ui:define>，因此它不包含在最终视图中，因此按钮没有任何表单可供提交，他们只是赢了似乎根本不起作用。

按如下方式重新排列Facelet模板客户端：

<ui:composition template="./generalTemplate.xhtml"
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets">

    <ui:define name="content">
        <h:outputStylesheet library="css" name="cssHibernate.css" />
        <h:form id="main">
            <h:dataTable value="#{hibernateDataOutput.persons}" var="list"
                         styleClass="order-table"
                         headerClass="order-table-header"
                         rowClasses="order-table-odd-row,order-table-even-row">
                <h:column>
                    <f:facet name="header">Delete</f:facet>
                    <h:commandButton id="userId" action="#{hibernateUserHandling.deleteUser(list.userId)}" image="delete.jpg" />
                </h:column>
            </h:dataTable>
        </h:form>
    </ui:define>
</ui:composition>

另见：

对于您的具体问题，

无关，Hibernate代码存在缺陷。但这是一个不同的问题。

更新：根据您之后在问题中编辑的堆栈跟踪，

Caused by: javax.el.ELException: Failed to parse the expression [#{hibernateUserHandling.deleteUser(list.userId)}]

显然您的环境根本不支持EL 2.2。您需要确保web.xml声明符合Servlet 3.0 API并且您要部署到Servlet 3.0兼容的servlet容器（例如Tomcat 7，Glassfish 3，JBoss AS 6等）。

另见：

How to call a method with a parameter in JSF

Answer 2

hibernate代码不正确。将您的方法修改为

public void deleteUser(String userIdViaXhtml)
{
    Session session = sessionFactory.openSession();
    session.beginTransaction();

    Query query = session.createQuery("DELETE FROM AddressDetails WHERE USERID = :userIdViaXhtml");
    query.setString("userIdViaXhtml",userIdViaXhtml);
    query.executeUpdate();

    session.createQuery("DELETE FROM UserDetails WHERE USERID = :userIdViaXhtml");
    query.setString("userIdViaXhtml",userIdViaXhtml);
    query.executeUpdate();

    session.getTransaction().commit();
    session.close();
}

提示：处理正常回滚的异常，不要直接在JSF托管bean中编写此代码，使用DAO模式。

带EL方法参数的命令按钮不会调用操作方法

2 个答案:

另见：

另见：