那些遇到过的问题

相关疑难解决方法(0)

如何在Eclipse项目中导入javax.servlet API？

我想在Eclipse中使用Servlet进行开发,但它说javax.servlet无法解析包.如何将javax.servlet包添加到Eclipse项目中？

java eclipse servlets

tom*_*tom
2010 11-18
313
推荐指数
9
解决办法
61万
查看次数

java.lang.NoClassDefFoundError:javax/el/ELManager

我正在使用Spring Tool Suite在Spring上开发一个webapp.如果我使用IDE在所提供的Pivotal tc服务器上构建和部署应用程序,它就可以正常工作.但是,如果我执行手动"mvn clean package"构建并尝试将其部署到独立的Tomcat服务器(使用最新的Tomcat 7),则会引发以下异常:

2017-08-23 15:24:13 WARN  AnnotationConfigWebApplicationContext:551 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcValidator' defined in org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: javax/el/ELManager
2017-08-23 15:24:13 ERROR DispatcherServlet:502 - Context initialization …
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java tomcat noclassdeffounderror maven

Jac*_*mok
2018 06-07
21
推荐指数
4
解决办法
3万
查看次数

加载器约束违规

我遇到了为一个项目两次使用相同的.jar(对于我的情况,el-api.jar v2.1)的问题,因此,当我尝试使用Tomcat 6运行我的项目时出现以下错误堆栈.

WARNING: Unexpected error forwarding to login page
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/login_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

 at java.lang.Thread.run(Thread.java:619)
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/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/login_jsp, and the …
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java continuous-integration maven-2

作者
2012 06-04
20
推荐指数
2
解决办法
7万
查看次数

java.lang.LinkageError:加载器约束违规:解析接口方法时javax.servlet.jsp.JspApplicationContext.getExpressionFactory()

我在Eclipse IDE中使用JSF 2.0.当我尝试实现JSP和Servlet时,我收到以下错误:

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/exCrop_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
at org.apache.jsp.exCrop_jsp._jspInit(exCrop_jsp.java:31)
at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:181)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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这是怎么造成的,我该如何解决？

jsf jsp servlets jsf-2

Mut*_*thu
2012 05-16
8
推荐指数
1
解决办法
3万
查看次数

Tomcat 7 javax.el.E​​LException

我今天重新启动了httpd和tomcat服务,之后就这样做了.我收到了以下消息.

我看到了这个帖子http://www.coderanch.com/t/592922/Tomcat/enable-el-api-jarver

并按照他们的说法做了.我查了一下,el-api.jar就在那里.我检查了另一台服务器,tomcat也运行得很好.

服务器是Centos 6.4(最终版)和Tomcat 7.0.23版.

我尝试了一切,甚至更换了jar文件,但似乎没有任何效果.

type Exception report

message

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

exception

org.apache.jasper.JasperException: javax.el.ELException: Provider com.sun.el.ExpressionFactoryImpl not found
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:585)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:396)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause

javax.el.ELException: Provider com.sun.el.ExpressionFactoryImpl not found
    javax.el.FactoryFinder.newInstance(FactoryFinder.java:101)
    javax.el.FactoryFinder.find(FactoryFinder.java:197)
    javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:189)
    javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:160)
    org.apache.jasper.runtime.JspApplicationContextImpl.getExpressionFactory(JspApplicationContextImpl.java:108)
    org.apache.jsp.index_jsp._jspInit(index_jsp.java:31)
    org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause

java.lang.ClassNotFoundException: com.sun.el.ExpressionFactoryImpl
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1533)
    javax.el.FactoryFinder.newInstance(FactoryFinder.java:87)
    javax.el.FactoryFinder.find(FactoryFinder.java:197)
    javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:189)
    javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:160)
    org.apache.jasper.runtime.JspApplicationContextImpl.getExpressionFactory(JspApplicationContextImpl.java:108)
    org.apache.jsp.index_jsp._jspInit(index_jsp.java:31)
    org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack …
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java tomcat centos

Ted*_*Pat
lucky-day
7
推荐指数
1
解决办法
1万
查看次数

Spring 3 + Tomcat 6:表单验证异常 - java.lang.NoSuchMethodError:javax.el.E​​xpressionFactory.newInstance()Ljavax/el/ExpressionFactory;

我是Spring 3 MVC的新手,正在尝试使用Java validation API和Hibernate Validator实现JAR 进行表单验证.我正在使用Tomcat 6作为我的应用程序.以下是pom.xml:

<properties>  
<spring.version>3.1.1.RELEASE</spring.version>  
<jdk.version>1.6</jdk.version>  
</properties>

<dependencies>  

    <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>  

    <!-- CGLIB is required to process @Configuration classes -->  
    <dependency>
    <groupId>cglib</groupId>
    <artifactId>cglib</artifactId>
    <version>2.2.2</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

    <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
</dependency>            

    <dependency>  
        <groupId>junit</groupId>  
        <artifactId>junit</artifactId>  
        <version>3.8.1</version>  
        <scope>test</scope>  
    </dependency>  
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.1.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>5.0.1.Final</version>
    </dependency>
       </dependencies>
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以下是模型类Employee.java: …

java spring tomcat spring-mvc maven

use*_*944
2014 05-04
1
推荐指数
1
解决办法
5123
查看次数

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