Tomcat 7 LinkageError：加载器约束违规

时间：2011-09-20 10:43:11

标签： jsf tomcat maven jsf-2 

INFO: Deploying web application archive test-1.0-SNAPSHOT.war
20-Sep-2011 12:08:42 org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\software\apache-tomcat-7.0.21\webapps\test-1.0-SNAPSHOT\WEB-INF\lib\servlet-api-2.5.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
20-Sep-2011 12:08:42 com.sun.faces.config.ConfigureListener contextInitialized
INFO: Initializing Mojarra 2.1.0 (SNAPSHOT 20100817) for context '/test-1.0-SNAPSHOT'
20-Sep-2011 12:08:42 com.sun.faces.spi.InjectionProviderFactory createInstance
INFO: JSF1048: PostConstruct/PreDestroy annotations present.  ManagedBeans methods marked with these annotations will have said annotations processed.
20-Sep-2011 12:08:43 com.sun.faces.config.ConfigureListener contextInitialized
SEVERE: Critical error during deployment: 
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, com/sun/faces/config/ConfigureListener, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
    at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:684)
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:240)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
20-Sep-2011 12:08:43 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: java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, com/sun/faces/config/ConfigureListener, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:290)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, com/sun/faces/config/ConfigureListener, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
    at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:684)
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:240)
    ... 8 more
20-Sep-2011 12:08:43 org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
20-Sep-2011 12:08:43 org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/test-1.0-SNAPSHOT] startup failed due to previous errors

我正在尝试运行mkong hello world JSF2示例http://www.mkyong.com/jsf2/jsf-2-0-hello-world-example/

POM.xml是

<dependency>
        <groupId>com.sun.faces</groupId>
        <artifactId>jsf-api</artifactId>
        <version>2.1.0-b03</version>
    </dependency>
    <dependency>
        <groupId>com.sun.faces</groupId>
        <artifactId>jsf-impl</artifactId>
        <version>2.1.0-b03</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.1</version>
    </dependency>

    <dependency>
        <groupId>com.sun.el</groupId>
        <artifactId>el-ri</artifactId>
        <version>1.0</version>
        <scope>provided</scope>
    </dependency>

此帖子loader constraint violation在tomcat 6中描述了同样的问题，但它无法解决我的问题。

4 个答案:

答案 0 :(得分：9)

我不做Maven，但是在你的链接问题中给出了Pascal Thivent的答案，似乎你需要将目标运行时的Maven依赖项标记为provided。

Tomcat作为一个简单的servletcontainer随附JSP，Servlet和EL（仅限JSF和JSTL）。您获得的异常消息表示类路径中的JSP API重复。我建议将pom.xml中的JSP和Servlet条目设置为provided。

此外，在解决问题Mojarra 2.1.0 does not work in Tomcat中所述的问题后，您将遇到第二个主要问题。升级到Mojarra 2.1.1或更新版本（目前为2.1.3）。另请参阅pom片段的Mojarra download page。

答案 1 :(得分：0)

评论

<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.1</version>
</dependency>

为我做了诀窍。似乎因为已经提供了jsp，所以添加依赖是不必要的并且产生错误

答案 2 :(得分：0)

这个答案是BalusC答案的补充。希望这会有所帮助。

使用Tomcat 7作为容器。您必须考虑默认的Shared Library Files。

对我来说，目录$TOMCATHOME/lib中有这样的文件：

  1. 注释-api.jar文件
  2. 卡塔利娜-的ant.jar
  3. 卡塔利娜-ha.jar
  4. ...
  5. 的jsp-api.jar文件
  6. servlet的api.jar文件
  7. ...

    8. 这就是为什么你必须将servlet-api，jsp-api和el-ri标记为provided，甚至排除JAR。

答案 3 :(得分：-1)

尝试将jar文件放入项目Build Path-＆gt; Configure Build Path-＆gt; Libraries-＆gt; Add External Jar ..

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