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我已將我的項目分爲2個包。我正在使用Maven。使用Hibernate包從另一個包中訪問數據庫
package 1 它是一個hibernate包，意味着它包含POJO類，DAO類和接口，BO類和接口以及hibernate配置。它生成一個JAR文件。
包2 這是一個JSF包，只包含網頁和託管的bean，我也使用ICEfaces。
我的目標是將第一個包的JAR文件包含在第二個包的構建路徑中，並使用BO類的方法從網頁訪問數據庫。
首先，我將列出所有配置的第一包的文件：
AppContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="bankBankBO"
class="bdl.cdr.core.bo.impl.BankBankBOImpl" >
<property name="bankBankDAO" ref="bankBankDAO" />
</bean>
<bean id="bankBankDAO"
class="bdl.cdr.core.dao.impl.BankBankDAOImpl" >
<property name="sessionFactory" ref="sessionFactory" />
</bean>
</beans>
DataSource.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>jdbc.properties</value>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
</beans>
HibernateSessionFactory.xml
個<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<!-- Hibernate session factory -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource"/>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="current_session_context_class">org.hibernate.context.ThreadLocalSessionContext</prop>
</props>
</property>
<property name="annotatedClasses">
<list>
<value>bdl.cdr.core.pojo.BankBank</value>
</list>
</property>
</bean>
</beans>
jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db2inst1
jdbc.username=root
jdbc.password=root
BeanLocations.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<!-- Database Configuration -->
<import resource="DataSource.xml"/>
<import resource="HibernateSessionFactory.xml"/>
<import resource="AppContext.xml"/>
</beans>
我使用JUnit測試，一切工作正常。
現在我所做的就是採用由Maven構建的JAR文件，並將其包含在第二個包的構建路徑中。
而這正是我試圖做的：
我創建了一個服務工廠（或BO廠）類：
public class ServiceFactory {
public static BankBankBO bankBankService;
public static BankBankBO getBankBankService() {
return bankBankService;
}
}
在faces-config.xml我增加了以下內容：
<managed-bean>
<managed-bean-name>serviceFactory</managed-bean-name>
<managed-bean-class>bdl.cdr.portlet.utils.ServiceFactory</managed-bean-class>
<managed-bean-scope>application</managed-bean-scope>
<managed-property>
<property-name>bankBankService</property-name>
<property-class>bdl.cdr.core.bo.BankBankBO</property-class>
<value>#{bankBankBO}</value>
</managed-property>
</managed-bean>
在鏈接到網頁的另一個bean中，我創建了一個按鈕上的單擊事件：
public void print(ActionEvent ae) {
ServiceFactory.getBankBankService().findAll();
}
findAll方法應該從數據庫返回所有Bank的列表，返回類型是hibernate包中的POJO類，名爲BankBank。
點擊該按鈕後，我收到以下異常：
SEVERE: Received 'java.lang.NullPointerException' when invoking action listener '#{jasperBean.print}' for component '_t38'
Jul 12, 2014 11:42:29 PM javax.faces.event.MethodExpressionActionListener processAction
SEVERE: java.lang.NullPointerException
at bdl.cdr.portlet.managedbeans.main.interfacemodule.JasperBean.print(JasperBean.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:148)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:775)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:786)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1251)
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:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
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:103)
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.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:744)
Jul 12, 2014 11:42:29 PM org.icefaces.impl.application.ExtendedExceptionHandler handle
WARNING: queued exception
javax.faces.event.AbortProcessingException: /index.xhtml @23,74 actionListener="#{jasperBean.print}": java.lang.NullPointerException
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:182)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:775)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:786)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1251)
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:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
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:103)
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.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at bdl.cdr.portlet.managedbeans.main.interfacemodule.JasperBean.print(JasperBean.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:148)
... 21 more
Jul 12, 2014 11:42:29 PM com.sun.faces.context.AjaxExceptionHandlerImpl log
SEVERE: JSF1073: javax.faces.event.AbortProcessingException caught during processing of INVOKE_APPLICATION 5 : UIComponent-ClientId=j_idt37:_t38, Message=/index.xhtml @23,74 actionListener="#{jasperBean.print}": java.lang.NullPointerException
Jul 12, 2014 11:42:29 PM com.sun.faces.context.AjaxExceptionHandlerImpl log
SEVERE: /index.xhtml @23,74 actionListener="#{jasperBean.print}": java.lang.NullPointerException
javax.faces.event.AbortProcessingException: /index.xhtml @23,74 actionListener="#{jasperBean.print}": java.lang.NullPointerException
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:182)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:775)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:786)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1251)
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:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
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:103)
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.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at bdl.cdr.portlet.managedbeans.main.interfacemodule.JasperBean.print(JasperBean.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:148)
... 21 more
我能提供的所有其他類和文件，web.xml，faces-config.xml，無論您需要的內容。
謝謝。
ServiceFactory.getBankBankService（）返回null，因爲bankBankService沒有初始化... – MGorgon
@Morgonon是的，我在幾分鐘前意識到這一點，我應該如何初始化它？是不是在'faces-config.xml'中提到它足夠了？ –
@AliBassam bankBankBO是Spring Bean，而ServiceFactory是JSF Managed Bean，所以注入bankBankService不起作用。閱讀有關JSF-Spring集成的信息，例如：http：//stackoverflow.com/questions/8925170/jsf-2-inject-spring-bean-service-with-managedproperty-and-no-xml – MGorgon