Spring Webflow 和 JSF：java.lang.NullPointerException 在 com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary
Spring Webflow and JSF: java.lang.NullPointerException at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary
我正在尝试构建一个使用 spring webflow 和使用 Eclipse IDE 的 JSF 的 Web 项目。所以我用 JSF 2.2 实现创建了一个动态 Web 项目。然而，在尝试 运行 项目时，我遇到了一些异常。下面是我的 Maven 配置文件。
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.breathejava</groupId>
<artifactId>WebFlowDemo2</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>SWF_Example Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>4.0.1.RELEASE</spring.version>
<swf.version>2.4.0.RELEASE</swf.version>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.webflow</groupId>
<artifactId>spring-webflow</artifactId>
<version>${swf.version}</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.sun.facelets</groupId>
<artifactId>jsf-facelets</artifactId>
<version>1.1.14</version>
</dependency>
<dependency>
<groupId>javax.faces</groupId>
<artifactId>javax.faces-api</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
<build>
<finalName>WebFlowDemo2</finalName>
</build>
</project>
堆栈跟踪
SEVERE: Critical error during deployment:
com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:449)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:214)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5017)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5531)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary(FaceletTaglibConfigProcessor.java:326)
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.process(FaceletTaglibConfigProcessor.java:270)
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:437)
... 10 more
Sep 09, 2015 3:26:09 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener
java.lang.RuntimeException: com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:273)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5017)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5531)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:449)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:214)
... 9 more
Caused by: java.lang.NullPointerException
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary(FaceletTaglibConfigProcessor.java:326)
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.process(FaceletTaglibConfigProcessor.java:270)
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:437)
... 10 more
Sep 09, 2015 3:26:09 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: One or more listeners failed to start. Full details will be found in the appropriate container log file
Sep 09, 2015 3:26:09 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/JSF_Webflow] startup failed due to previous errors
Sep 09, 2015 3:26:09 PM javax.faces.FactoryFinder$FactoryManager getFactory
SEVERE: Application was not properly initialized at startup, could not find Factory: javax.faces.application.ApplicationFactory. Attempting to find backup.
Sep 09, 2015 3:26:09 PM com.sun.faces.config.ConfigureListener contextDestroyed
SEVERE: Unexpected exception when attempting to tear down the Mojarra runtime
java.lang.IllegalStateException: Could not find backup for factory javax.faces.application.ApplicationFactory.
at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1135)
at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:379)
at com.sun.faces.config.InitFacesContext.getApplication(InitFacesContext.java:140)
at com.sun.faces.config.ConfigureListener.contextDestroyed(ConfigureListener.java:310)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:5064)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5726)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
导致此异常的原因是什么？是什么原因，有什么解决办法吗？
这是不对的。
<dependency>
<groupId>com.sun.facelets</groupId>
<artifactId>jsf-facelets</artifactId>
<version>1.1.14</version>
</dependency>
<dependency>
<groupId>javax.faces</groupId>
<artifactId>javax.faces-api</artifactId>
<version>2.2</version>
</dependency>
Facelets 1.x 适用于 JSF 1.x。从 JSF 2.0 开始，Facelets 被集成为标准 JSF API 的一部分。实际上，您最终会在运行时类路径中得到两个不同的 Facelets 版本，它们彼此不兼容，从而导致与处理 Facelets 文件相关的所有颜色的类路径冲突。
摆脱 Facelets 1.x。在 JSF 2.x 中不需要它。
与具体问题无关，SpringWebFlow 和 JSF 2.2 的组合很奇怪，因为 JSF 2.2 已经附带内置流范围支持。您通常只希望看到 Spring WebFlow 与缺少流范围功能的 JSF 2.0/2.1 结合使用。然后我不是在谈论你的 pom 中的 Spring MVC。看起来您根本不知道 JSF 是什么以及它的用途。这是阅读的食物：Using JSF as view technology of Spring MVC.
我正在尝试构建一个使用 spring webflow 和使用 Eclipse IDE 的 JSF 的 Web 项目。所以我用 JSF 2.2 实现创建了一个动态 Web 项目。然而，在尝试 运行 项目时，我遇到了一些异常。下面是我的 Maven 配置文件。
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.breathejava</groupId>
<artifactId>WebFlowDemo2</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>SWF_Example Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>4.0.1.RELEASE</spring.version>
<swf.version>2.4.0.RELEASE</swf.version>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.webflow</groupId>
<artifactId>spring-webflow</artifactId>
<version>${swf.version}</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.sun.facelets</groupId>
<artifactId>jsf-facelets</artifactId>
<version>1.1.14</version>
</dependency>
<dependency>
<groupId>javax.faces</groupId>
<artifactId>javax.faces-api</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
<build>
<finalName>WebFlowDemo2</finalName>
</build>
</project>
堆栈跟踪
SEVERE: Critical error during deployment:
com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:449)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:214)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5017)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5531)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary(FaceletTaglibConfigProcessor.java:326)
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.process(FaceletTaglibConfigProcessor.java:270)
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:437)
... 10 more
Sep 09, 2015 3:26:09 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener
java.lang.RuntimeException: com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:273)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5017)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5531)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! null
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:449)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:214)
... 9 more
Caused by: java.lang.NullPointerException
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.processTagLibrary(FaceletTaglibConfigProcessor.java:326)
at com.sun.faces.config.processor.FaceletTaglibConfigProcessor.process(FaceletTaglibConfigProcessor.java:270)
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:437)
... 10 more
Sep 09, 2015 3:26:09 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: One or more listeners failed to start. Full details will be found in the appropriate container log file
Sep 09, 2015 3:26:09 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/JSF_Webflow] startup failed due to previous errors
Sep 09, 2015 3:26:09 PM javax.faces.FactoryFinder$FactoryManager getFactory
SEVERE: Application was not properly initialized at startup, could not find Factory: javax.faces.application.ApplicationFactory. Attempting to find backup.
Sep 09, 2015 3:26:09 PM com.sun.faces.config.ConfigureListener contextDestroyed
SEVERE: Unexpected exception when attempting to tear down the Mojarra runtime
java.lang.IllegalStateException: Could not find backup for factory javax.faces.application.ApplicationFactory.
at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1135)
at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:379)
at com.sun.faces.config.InitFacesContext.getApplication(InitFacesContext.java:140)
at com.sun.faces.config.ConfigureListener.contextDestroyed(ConfigureListener.java:310)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:5064)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5726)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
导致此异常的原因是什么？是什么原因，有什么解决办法吗？
这是不对的。
<dependency>
<groupId>com.sun.facelets</groupId>
<artifactId>jsf-facelets</artifactId>
<version>1.1.14</version>
</dependency>
<dependency>
<groupId>javax.faces</groupId>
<artifactId>javax.faces-api</artifactId>
<version>2.2</version>
</dependency>
Facelets 1.x 适用于 JSF 1.x。从 JSF 2.0 开始，Facelets 被集成为标准 JSF API 的一部分。实际上，您最终会在运行时类路径中得到两个不同的 Facelets 版本，它们彼此不兼容，从而导致与处理 Facelets 文件相关的所有颜色的类路径冲突。
摆脱 Facelets 1.x。在 JSF 2.x 中不需要它。
与具体问题无关，SpringWebFlow 和 JSF 2.2 的组合很奇怪，因为 JSF 2.2 已经附带内置流范围支持。您通常只希望看到 Spring WebFlow 与缺少流范围功能的 JSF 2.0/2.1 结合使用。然后我不是在谈论你的 pom 中的 Spring MVC。看起来您根本不知道 JSF 是什么以及它的用途。这是阅读的食物：Using JSF as view technology of Spring MVC.