servlet-api.jar-未在本地主机上加载jar

Question

This jar in not loading in my Tomcat 7 environment locally. This worked fine yesterday when I shut down for the day. Nothing has changed, but when I start this morning this is what I am presented with. Nothing has changed - really. I just opened up Eclipse to start working and testing my web app - which cannot be found and returns a 404.

What would cause a jar not to load? I have no errors in the project and have cleaned it.

The offending jar is located:

C:\Users\me\Documents\Dev\Eclipse\J2EE_WDT\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\app.cloud.services\WEB-INF\lib

The Console output after cleaning:

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

EDIT

What I am trying to do is start my web app, which currently cannot be found because the jar is not loading. It's physically where it should be - again this worked yesterday and now as of this morning is not.

Answer 1

servlet-api.jar is loaded from tomcat_home/lib directory. I can suggest you to clean tomcat server and restart it. To clean tomcat you need to do "Window -> Show View -> Other -> Servers" and you'll be able to see the tomcat server. Right click and hit "Clean...". Hope this should resolve your problem as it was working fine yesterday and suddenly not working today without any change.