java.lang.NoClassDefFoundError：无法初始化类financeiro.util.JpaUtil

Question

我需要帮助才能显示电子书Algaworks的咨询结果页面。欢迎任何帮助！

控制台（日志文件）

 jul 25, 2016 10:42:45 PM com.sun.faces.lifecycle.InvokeApplicationPhase execute
ADVERTÊNCIA: #{consultaLancamentosBean.consultar}: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
javax.faces.FacesException: #{consultaLancamentosBean.consultar}: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UIViewAction.broadcast(UIViewAction.java:559)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.el.EvaluationException: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:94)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 28 more
Caused by: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:107)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    ... 29 more

jul 25, 2016 10:42:45 PM com.sun.faces.context.ExceptionHandlerImpl log
1100: JSF1073: javax.faces.FacesException obtido durante o processamento de INVOKE_APPLICATION 5: UIComponent-ClientId=, Message=#{consultaLancamentosBean.consultar}: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
jul 25, 2016 10:42:45 PM com.sun.faces.context.ExceptionHandlerImpl log
1100: #{consultaLancamentosBean.consultar}: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
javax.faces.FacesException: #{consultaLancamentosBean.consultar}: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:89)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.FacesException: #{consultaLancamentosBean.consultar}: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UIViewAction.broadcast(UIViewAction.java:559)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    ... 24 more
Caused by: javax.faces.el.EvaluationException: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:94)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 28 more
Caused by: javax.el.PropertyNotFoundException: /ConsultaLancamentos.xhtml @10,65 action="#{consultaLancamentosBean.consultar}": Target Unreachable, identifier 'consultaLancamentosBean' resolved to null
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:107)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    ... 29 more

---＆GT; Persistence.xml（/ src / main / resources / META-INF）：

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
    version="2.1">

    <persistence-unit name="FinanceiroPU">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.janaina.financeiro.model.Pessoa</class>
        <class>com.janaina.financeiro.model.Lancamento</class>

        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/financeiro" />
            <property name="javax.persistence.jdbc.user" value="postgres" />
            <property name="javax.persistence.jdbc.password" value="postgres" />
            <property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />

            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
        </properties>
    </persistence-unit>
</persistence>

---＆GT; ConsultaLacamentos.xhtml：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://xmlns.jcp.org/jsf/core"
    xmlns:h="http://xmlns.jcp.org/jsf/html">
<h:head>
    <title>Consulta de lançamentos</title>
</h:head>
<h:body>
    <f:metadata>
        <f:viewAction action="#{consultaLancamentosBean.consultar}" />
    </f:metadata>
    <h1>Consulta de lançamentos</h1>
    <h:form id="frm">
        <h:dataTable value="#{consultaLancamentosBean.lancamentos}"
            var="lancamento" border="1" cellspacing="0" cellpadding="2">
            <h:column>
                <f:facet name="header">
                    <h:outputText value="Pessoa" />
                </f:facet>
                <h:outputText value="#{lancamento.pessoa.nome}" />
            </h:column>
            <h:column>
                <f:facet name="header">
                    <h:outputText value="Descrição" />
                </f:facet>
                <h:outputText value="#{lancamento.descricao}" />
            </h:column>
            <h:column>
                <f:facet name="header">
                    <h:outputText value="Tipo" />
                </f:facet>
                <h:outputText value="#{lancamento.tipo}" />
            </h:column>
            <h:column>
                <f:facet name="header">
                    <h:outputText value="Valor" />
                </f:facet>
                <h:outputText value="#{lancamento.valor}" />
            </h:column>
            <h:column>
                <f:facet name="header">
                    <h:outputText value="Data de vencimento" />
                </f:facet>
                <h:outputText value="#{lancamento.dataVencimento}" />
            </h:column>
            <h:column>
                <f:facet name="header">
                    <h:outputText value="Data de pagamento" />
                </f:facet>
                <h:outputText value="#{lancamento.dataPagamento}" />
            </h:column>
        </h:dataTable>
    </h:form>
</h:body>
</html>

---＆GT; ConsultaLacamentosBean.java

package com.janaina.financeiro.controller;

import java.io.Serializable;
import java.util.List;

import javax.faces.bean.ManagedBean;
import javax.faces.view.ViewScoped;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;

import com.janaina.financeiro.model.Lancamento;
import com.janaina.financeiro.util.JpaUtil;

@ManagedBean
@ViewScoped
public class ConsultaLancamentosBean implements Serializable {
    private static final long serialVersionUID = 1L;
    private List<Lancamento> lancamentos;

    public void consultar() {
        EntityManager manager = JpaUtil.getEntityManager();
        TypedQuery<Lancamento> query = manager.createQuery("from Lancamento", Lancamento.class);
        this.lancamentos = query.getResultList();
        manager.close();
    }

    public List<Lancamento> getLancamentos() {
        return lancamentos;
    }
}

---＆GT; JpaUtil.java

package com.janaina.financeiro.util;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

//JpaUtil armazena a instância compartilhada de EntityManagerFactory em uma variável estática
//Qualquer código terá acesso fácil e rápido
//Sempre que for preciso uma EntityManager basta chamar:
//EntityManager manager = JpaUtil.getEntityManager();

public class JpaUtil {
    private static EntityManagerFactory factory;
    static {
        factory = Persistence.createEntityManagerFactory("FinanceiroPU");
    }

    public static EntityManager getEntityManager() {
        return factory.createEntityManager();
    }
}

Answer 1

我解决了这个问题！我意识到我的问题的原因是：

1）我在项目中使用Java JRE而不是JDK。为了解决这个问题，我做了以下工作：Rigth-点击Project＆gt;性状＆gt; Java构建路径＆gt;库和GT;我正在使用的选定JRE＆gt;编辑＆gt;已安装的JRE＆gt;搜索＆GT; JDK路径（C：\ Program Files \ Java \ jdk1.8.0_101）。

2）然后我意识到我无法连接到PostgreSQL。然后我卸载了PostgreSQL并删除了Program Files中的目录，然后重新安装了！

3）最后：右键单击Project＆gt;以＆gt;运行行家＆GT; Maven Clean然后Rigth-点击Project＆gt;以＆gt;运行行家＆GT; Maven安装

上述步骤对我有用..我希望他们帮助别人！

我的（web.xml）：

Shown

的persistence.xml：

import os
import zipfile
import csv
import glob

currentPath = r"K:\BsbProd\BSBCHS\BSB_4_Release"

for zip in glob.glob('{}/*.zip'.format(currentPath)):
    zf = zipfile.ZipFile(os.path.join(currentPath, zip), 'r')
    for each in [n for n in zf.namelist() if n.lower().endswith('.kap')]:
        currentFile = zf.open(each).readlines()
        writer = csv.writer(open(r"C:\Users\PalmerDa\Desktop\BSB2{}.csv".format(os.path.basename(each)), "wb"))
        plys = [r for r in currentFile if r.startswith('PLY')]
        for rr in plys:
            col1, col2 = rr.split(",")[1:]
            rows = float(col1), float(col2)
            writer.writerow(rows)
        if plys[0] != plys[-1]:
            writer.writerow((float(plys[0].split(",")[1]),float(plys[0].split(",")[2])))