4.3.7. 调试和解决 Seam 2.2 Booking 例程的运行时错误和异常

过程 4.11. 调试和解决运行时错误和异常

1. 问题 - javax.naming.NameNotFoundException: Name 'jboss-seam-booking' not found in context ''
   当您通过浏览器访问 URL http://localhost:8080/seam-booking/ 时，您会看到 "The page isn't redirecting properly" 且日志会包含下列错误：

   SEVERE [org.jboss.seam.jsf.SeamPhaseListener] (http--127.0.0.1-8080-1) swallowing exception: java.lang.IllegalStateException: Could not start transaction
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:598) [jboss-seam.jar:]
     (... log messages removed ...)
   Caused by: org.jboss.seam.InstantiationException: Could not instantiate Seam component: org.jboss.seam.transaction.synchronizations
     at org.jboss.seam.Component.newInstance(Component.java:2170) [jboss-seam.jar:]
     (... log messages removed ...)
   Caused by: javax.naming.NameNotFoundException: Name 'jboss-seam-booking' not found in context ''
     at org.jboss.as.naming.util.NamingUtils.nameNotFoundException(NamingUtils.java:109)
     (... log messages removed ...)
   

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   它表示：

   NameNotFoundException 表示了 JNDI 命名问题。JNDI 命名规则在 JBoss EAP 6 里已经进行了修改，所以您需要修改查找名称以遵循新的规则。

   如何解决这个问题：

   为了调集试，

   15:01:16,138 INFO  [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-1) JNDI bindings for session bean named RegisterAction in deployment unit subdeployment "jboss-seam-booking.jar" of deployment "jboss-seam-booking.ear" are as follows:
     java:global/jboss-seam-booking/jboss-seam-booking.jar/RegisterAction!org.jboss.seam.example.booking.Register
     java:app/jboss-seam-booking.jar/RegisterAction!org.jboss.seam.example.booking.Register
     java:module/RegisterAction!org.jboss.seam.example.booking.Register
     java:global/jboss-seam-booking/jboss-seam-booking.jar/RegisterAction
     java:app/jboss-seam-booking.jar/RegisterAction
     java:module/RegisterAction
     [JNDI bindings continue ...]
   

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   日志里一共列出了 8 个 INFO JNDI 绑定，每个都对应一个会话 bean：RegisterAction、BookingListAction、HotelBookingAction、AuthenticatorAction、ChangePasswordAction、HotelSearchingAction、EjbSynchronizations 和 TimerServiceDispatcher。您需要修改 WAR 的 lib/components.xml 文件来使用新的 JNDI 绑定。在日志里，注意 EJB JNDI 绑定都以 "java:app/jboss-seam-booking.jar" 开始。请替换 core:init 元素：

   <!--     <core:init jndi-pattern="jboss-seam-booking/#{ejbName}/local" debug="true" distributable="false"/> -->
   <core:init jndi-pattern="java:app/jboss-seam-booking.jar/#{ejbName}" debug="true" distributable="false"/>
   
   

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   然后，您需要添加 EjbSynchronizations 和 TimerServiceDispatcher JNDI 绑定。请添加下列 component 元素到这个文件里：

   <component class="org.jboss.seam.transaction.EjbSynchronizations" jndi-name="java:app/jboss-seam/EjbSynchronizations"/>
   <component class="org.jboss.seam.async.TimerServiceDispatcher" jndi-name="java:app/jboss-seam/TimerServiceDispatcher"/>
   
   

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   components.xml 文件应该类似于：

   <?xml version="1.0" encoding="UTF-8"?>
   <components xmlns="http://jboss.com/products/seam/components"
     xmlns:core="http://jboss.com/products/seam/core"
     xmlns:security="http://jboss.com/products/seam/security"
     xmlns:transaction="http://jboss.com/products/seam/transaction"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation=
       "http://jboss.com/products/seam/core http://jboss.com/products/seam/core-2.2.xsd
        http://jboss.com/products/seam/transaction http://jboss.com/products/seam/transaction-2.2.xsd
        http://jboss.com/products/seam/security http://jboss.com/products/seam/security-2.2.xsd
        http://jboss.com/products/seam/components http://jboss.com/products/seam/components-2.2.xsd">
   
       <!-- <core:init jndi-pattern="jboss-seam-booking/#{ejbName}/local" debug="true" distributable="false"/> -->
       <core:init jndi-pattern="java:app/jboss-seam-booking.jar/#{ejbName}" debug="true" distributable="false"/>
       <core:manager conversation-timeout="120000"
                     concurrent-request-timeout="500"
                     conversation-id-parameter="cid"/>
       <transaction:ejb-transaction/>
       <security:identity authenticate-method="#{authenticator.authenticate}"/>
       <component class="org.jboss.seam.transaction.EjbSynchronizations"
               jndi-name="java:app/jboss-seam/EjbSynchronizations"/>
       <component class="org.jboss.seam.async.TimerServiceDispatcher"
               jndi-name="java:app/jboss-seam/TimerServiceDispatcher"/>
   </components>
   
   

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   通过删除 standalone/deployments/jboss-seam-booking.ear.failed 文件并在相同目录里创建一个空白的 jboss-seam-booking.ear.dodeploy 文件来重新部署应用程序。
2. 问题 - 应用程序部署和运行无误。当您访问 http://localhost:8080/seam-booking/ 并试图登陆时失败，错误消息为 "Login failed. Transaction failed."。您应该在服务器日志里看到如下异常跟踪信息：

   13:36:04,631 WARN  [org.jboss.modules] (http-/127.0.0.1:8080-1) Failed to define class org.jboss.seam.persistence.HibernateSessionProxy in Module "deployment.jboss-seam-booking.ear.jboss-seam.jar:main" from Service Module Loader: java.lang.LinkageError: Failed to link org/jboss/seam/persistence/HibernateSessionProxy (Module "deployment.jboss-seam-booking.ear.jboss-seam.jar:main" from Service Module Loader)
   ....
   Caused by: java.lang.LinkageError: Failed to link org/jboss/seam/persistence/HibernateSessionProxy (Module "deployment.jboss-seam-booking.ear.jboss-seam.jar:main" from Service Module Loader)
   ...
   Caused by: java.lang.NoClassDefFoundError: org/hibernate/engine/SessionImplementor
   	at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.7.0_45]
   ...
   Caused by: java.lang.ClassNotFoundException: org.hibernate.engine.SessionImplementor from [Module "deployment.jboss-seam-booking.ear.jboss-seam.jar:main" from Service Module Loader]
   ...
   

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   它表示：

   ClassNotFoundException 表示缺失的 Hibernate 库。在这个例子里是 hibernate-core.jar。

   如何解决这个问题：

   从 EAP5_HOME/seam/lib/ 目录复制 hibernate-core.jar JAR 到 jboss-seam-booking.ear/lib 目录。

   通过删除 standalone/deployments/jboss-seam-booking.ear.failed 文件并在相同目录里创建一个空白的 jboss-seam-booking.ear.dodeploy 文件来重新部署应用程序。
3. 问题 - 应用程序部署和运行无误。当您访问 http://localhost:8080/seam-booking/，您可以成功登录。然而，当您试图预订酒店时，您会看到如下异常跟踪信息：
   为了进行调试，您必须首先删除 jboss-seam-booking.ear/jboss-seam-booking.war/WEB-INF/lib/jboss-seam-debug.jar，因为它标记了真正的错误。此时，您应该看到如下错误：

   java.lang.NoClassDefFoundError: org/hibernate/annotations/common/reflection/ReflectionManager

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   它表示：

   ClassNotFoundException 表示有缺失的 Hibernate 库。

   如何解决这个问题：

   从 EAP5_HOME/seam/lib/ 目录复制 hibernate-annotations.jar 和 hibernate-commons-annotations.jar 到 jboss-seam-booking.ear/lib 目录。

   通过删除 standalone/deployments/jboss-seam-booking.ear.failed 文件并在相同目录里创建一个空白的 jboss-seam-booking.ear.dodeploy 文件来重新部署应用程序。
4. 运行时和应用程序错误应该被解决
   此时，应用程序已部署且运行无误。
   返回上一个主题，请点击：第 4.3.4 节 “移植 Seam 2.2 Booking 例程到 JBoss EAP 6：逐步说明”