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这些是我在 pom.xml (Maven) 中使用的依赖项。我不明白为什么我会得到

 javax.servlet.ServletException: java.lang.LinkageError

当我尝试运行我的项目时。

<dependencies>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-dojo-plugin</artifactId>
        <version>2.3.4.1</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.4</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts-taglib</artifactId>
        <version>1.3.10</version>

    </dependency>
    <dependency>
        <groupId>org.jasypt</groupId>
        <artifactId>jasypt-hibernate3</artifactId>
        <version>1.9.0</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.2.6.Final</version>
    </dependency>
    <dependency>
        <groupId>javax.transaction</groupId>
        <artifactId>jta</artifactId>
        <version>1.1</version>
    </dependency>
    <dependency>
        <groupId>com.jgeppert.struts2.jquery</groupId>
        <artifactId>struts2-jquery-plugin</artifactId>
        <version>3.3.3</version>
    </dependency>
    <dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz</artifactId>
        <version>1.7.3</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.21</version>
    </dependency>

    <dependency>
        <groupId>opensymphony</groupId>
        <artifactId>sitemesh</artifactId>
        <version>2.4.1</version>
    </dependency>
    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-json-plugin</artifactId>
        <version>2.3.8</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.1</version>
    </dependency>
</dependencies>

它在另一台 PC 上运行。我刚刚做了一个 maven clean 然后什么时候到我硬盘上的项目位置，压缩它，当我从家里的 zip 导入项目时，就会出现这个问题。请告诉您是否有任何提示或线索。谢谢你。

编辑1：

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: 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/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/Index_jsp, 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
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:343)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)


root cause 

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/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/Index_jsp, 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
    org.apache.jsp.Index_jsp._jspInit(Index_jsp.java:26)
    org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:171)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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1 回答 1

2

jsp-api使用范围修改你的，provided这样 Maven 就不会尝试多次加载它。

您可能多次包含罐子。您看到的 linksErrors 来自同名类，由两个不同的加载程序以两种不同的方式加载。确保你不包括任何额外的罐子。

特别javax.servlet.jsp.JspApplicationContext是，由服务器类加载器提供，由于随之而来的冲突，不应将其添加为 JAR。javax.el.ExpressionFactoryjSP API 可能会提供相同的功能。

于 2013-10-08T17:02:00.460 回答