【发布时间】：2013-04-25 14:37:00
【问题描述】：
这个 jar 没有在本地加载到我的 Tomcat 7 环境中。昨天当我关闭一天时，这工作得很好。什么都没有改变，但是当我今天早上开始时，这就是我所看到的。什么都没有改变——真的。我刚刚打开 Eclipse 开始工作和测试我的网络应用程序 - 找不到并返回 404。
什么会导致 jar 无法加载？我在项目中没有错误并已清理它。
有问题的 jar 位于：
C:\Users\me\Documents\Dev\Eclipse\J2EE_WDT\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\app.cloud.services\WEB-INF\lib
清理后的控制台输出：
Apr 25, 2013 9:38:31 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/mydomain.com] has started
Apr 25, 2013 9:38:35 AM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: urn:com:sun:jersey:api:view is already defined
Apr 25, 2013 9:38:35 AM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
com.mydomain.webservices
Apr 25, 2013 9:38:35 AM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
class com.mydomain.webservices.Encryption
class com.mydomain.webservices.Codec
Apr 25, 2013 9:38:35 AM com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No provider classes found.
Apr 25, 2013 9:38:35 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.12 02/15/2012 04:51 PM'
Apr 25, 2013 9:38:36 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/mydomain.com] is completed
Apr 25, 2013 9:38:36 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/cs.core.web] has started
Apr 25, 2013 9:38:36 AM java.util.jar.Attributes read
WARNING: Duplicate name in Manifest: Class-Path.
Ensure that the manifest does not have duplicate entries, and
that blank lines separate individual sections in both your
manifest and in the META-INF/MANIFEST.MF entry in the jar file.
Apr 25, 2013 9:38:36 AM java.util.jar.Attributes read
WARNING: Duplicate name in Manifest: Class-Path.
Ensure that the manifest does not have duplicate entries, and
that blank lines separate individual sections in both your
manifest and in the META-INF/MANIFEST.MF entry in the jar file.
Apr 25, 2013 9:38:36 AM java.util.jar.Attributes read
WARNING: Duplicate name in Manifest: Class-Path.
Ensure that the manifest does not have duplicate entries, and
that blank lines separate individual sections in both your
manifest and in the META-INF/MANIFEST.MF entry in the jar file.
Apr 25, 2013 9:38:36 AM java.util.jar.Attributes read
WARNING: Duplicate name in Manifest: Class-Path.
Ensure that the manifest does not have duplicate entries, and
that blank lines separate individual sections in both your
manifest and in the META-INF/MANIFEST.MF entry in the jar file.
Apr 25, 2013 9:38:36 AM java.util.jar.Attributes read
WARNING: Duplicate name in Manifest: Class-Path.
Ensure that the manifest does not have duplicate entries, and
that blank lines separate individual sections in both your
manifest and in the META-INF/MANIFEST.MF entry in the jar file.
Apr 25, 2013 9:38:40 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/cs.core.web] is completed
Apr 25, 2013 9:38:40 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/app.cloud.services] has started
Apr 25, 2013 9:38:41 AM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\Users\me\Documents\Dev\Eclipse\J2EE_WDT\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\app.cloud.services\WEB-INF\lib\el-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/el/Expression.class
Apr 25, 2013 9:38:41 AM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\Users\me\Documents\Dev\Eclipse\J2EE_WDT\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\app.cloud.services\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Apr 25, 2013 9:38:45 AM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: urn:com:sun:jersey:api:view is already defined
Apr 25, 2013 9:38:45 AM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
com.app.api
Apr 25, 2013 9:38:45 AM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
class com.app.api.SyncAccount
class com.app.api.Override
class com.app.api.SyncSchedule
class com.app.api.SyncDevice
class com.app.api.Register_NOTUSED
class com.app.api.Mock
class com.app.api.Contact
class com.app.api.WSInit
class com.app.api.SyncMetrics
Apr 25, 2013 9:38:45 AM com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No provider classes found.
Apr 25, 2013 9:38:45 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.12 02/15/2012 04:51 PM'
Apr 25, 2013 9:38:45 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/app.cloud.services] is completed
编辑
我要做的是启动我的网络应用程序，由于 jar 未加载，目前无法找到该应用程序。它在物理上它应该在的位置 - 昨天再次起作用，现在到今天早上却没有。
【问题讨论】：
-
罐子在哪里？你是如何将它添加到你的类路径中的？
-
@SotiriosDelimanolis 是 servlet-api.jar。看起来 OP 没有运行 Tomcat，或者 Tomcat 安装以某种方式损坏。
-
请让我们现在告诉我们您到底要做什么以及您在哪里（哪个应用程序）收到错误以及错误消息/详细信息。您在浏览器中访问 Web 应用程序时是否收到 404，或者您的 Eclipse 无法找到 jar 或两者都找不到？
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@SotiriosDelimanolis 这意味着 OP 正在工作区文件夹中部署 tomcat 应用程序（是的，对于初学者来说，这是一个未知的坏习惯）。 OP 应该尝试在 tomcat 文件夹中部署应用程序并从 WEB-INF/lib 中删除此 servlet-api.jar。
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照 Luiggi Mendoza 说的做。 Tomcat 抛出错误，因为您尝试加载 servlet-api.jar 两次（再次从您的 WEB-INF/lib 文件夹），而 Tomcat 已经可以使用它。
标签： java jar http-status-code-404