blocks|key|1585809|text|我也有同样的症状，一个使用maven的web应用程序项目。在我的例子中，与web.xml中的struts+taglib标记相关，并且该项目具有struts+v1.2.9依赖项。我通过切换到struts+v1.3.10解决了这个问题。不要问为什么这解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1585810|如果您处于相同的情况，并且将struts依赖项从1.2.9升级到1.3.10，请确保在web.xml的DOCTYPE声明中至少使用DTDv2.3：|1585811|!DOCTYPE+web-app+PUBLIC+"-//Sun+Microsystems，Inc.//DTD+Web+Application+2.3//EN“"http://java.sun.com/j2ee/dtds/web-app_2_3.dtd”|offset|length|1585812|否则你会遇到另一个问题(你的webapp在没有互联网连接的情况下无法启动)|1585813|希望这能有所帮助|1585814|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/j2ee/dtds/web-app/_2/_3.dtd^0|0|0|28|19|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I just got the same symptoms, with a web-app project using maven. In my case, was related to struts taglib tags in web.xml, and the project having a struts v1.2.9 dependency. I solved the problem by switching to struts v1.3.10. Don't ask why this solved the problem.

If you are in the same situation and you upgrade your struts dependency from 1.2.9 to 1.3.10, be sure to use at least dtd v2.3 in the DOCTYPE declaration of your web.xml:

!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/j2ee/dtds/web-app_2_3.dtd"

or you'll get another problem (your webapp won't startup without an internet connection)

Hope this helps

blocks|key|1800700|text|我怀疑问题出在Eclipse+web工具平台和Java+EMF模型上。以下是来自Eclipse+Web+Tools+Platform的插件列表的图像，包括Java+EMF+Model和JEM内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800701|📷|atomic|offset|length|1800702|​|1800703|https://stackoverflow.com/users/1503535/nitin-gurram，你的堆栈跟踪是这样的吗？|1800704|!ENTRY+org.eclipse.core.jobs+4+2+2012-09-28+12:10:00.554
!MESSAGE+An+internal+error+occurred+during:+"Loading+descriptor+for+grch97.".
!STACK+0
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException:+org.eclipse.emf.ecore.xmi.FeatureNotFoundException:+Feature+'taglib'+not+found.+(platform:/resource/grch97/WEB-INF/web.xml,+891,+11)
++++at+org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:319)
++++at+org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:278)
++++at+org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:1003)
++++at+org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelResource(JEE5ModelProvider.java:169)
++++at+org.eclipse.jst.jee.model.internal.Web25ModelProvider.getModelObject(Web25ModelProvider.java:44)
++++at+org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelObject(JEE5ModelProvider.java:215)
++++at+org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadProviders(AbstractMergedModelProvider.java:261)
++++at+org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.access$2(AbstractMergedModelProvider.java:255)
++++at+org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider$LoadModelsWorkspaceRunnable.run(AbstractMergedModelProvider.java:278)
++++at+org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
++++at+org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadModel(AbstractMergedModelProvider.java:249)
++++at+org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getMergedModel(AbstractMergedModelProvider.java:219)
++++at+org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getModelObject(AbstractMergedModelProvider.java:139)
++++at+org.eclipse.jst.jee.ui.internal.navigator.Web25ContentProvider.getNewContentProviderInstance(Web25ContentProvider.java:69)
++++at+org.eclipse.jst.jee.ui.internal.navigator.LoadingJeeDDJob.run(LoadingJeeDDJob.java:50)
++++at+org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused+by:+org.eclipse.emf.ecore.xmi.FeatureNotFoundException:+Feature+'taglib'+not+found.+(platform:/resource/grch97/WEB-INF/web.xml,+891,+11)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLHandler.reportUnknownFeature(XMLHandler.java:1985)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleUnknownFeature(XMLHandler.java:1949)
++++at+org.eclipse.emf.ecore.xmi.impl.XMIHandler.handleUnknownFeature(XMIHandler.java:145)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleFeature(XMLHandler.java:1893)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLHandler.processElement(XMLHandler.java:1017)
++++at+org.eclipse.emf.ecore.xmi.impl.XMIHandler.processElement(XMIHandler.java:81)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:995)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:706)
++++at+org.eclipse.emf.ecore.xmi.impl.XMIHandler.startElement(XMIHandler.java:163)
++++at+com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown+Source)
++++at+com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown+Source)
++++at+javax.xml.parsers.SAXParser.parse(Unknown+Source)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:175)
++++at+org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:240)
++++at+org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1505)
++++at+org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1284)
++++at+org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:259)
++++at+org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.demandLoad(ProjectResourceSetImpl.java:811)
++++at+org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:274)
...+14+more|code-block|syntax|javascript|1800705|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/559e1d6af1d828911b5c378f1333961c.jpeg|imageAlt|1|LINK|MUTABLE|url|https://stackoverflow.com/users/1503535/nitin-gurram^0|0|0|1|0|0|0|0|1G|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@$E|15|F|16|1|17]]|A|$]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|19|8|@]|9|@$E|1A|F|1B|1|1C]]|A|$]]|$1|K|3|L|5|M|7|1D|8|@]|9|@]|A|$N|O]]|$1|P|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]|Y|$5|Z|T|10|A|$11|12]]]]

I suspect that the problem is with Eclipse web Tools Platform and Java EMF Model. Here is an image of a list of plugins including Java EMF Model and JEM stuff from Eclipse Web Tools Platform:
<img src="https://i.stack.imgur.com/CugcO.jpg" alt="List of plugins including Java EMF Model and JEM stuff from Eclipse Web Tools Platform">

<a href="https://stackoverflow.com/users/1503535/nitin-gurram">https://stackoverflow.com/users/1503535/nitin-gurram</a>, does your stack trace look like this?

<pre><code>!ENTRY org.eclipse.core.jobs 4 2 2012-09-28 12:10:00.554
!MESSAGE An internal error occurred during: "Loading descriptor for grch97.".
!STACK 0
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException: org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'taglib' not found. (platform:/resource/grch97/WEB-INF/web.xml, 891, 11)
 at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:319)
 at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:278)
 at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:1003)
 at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelResource(JEE5ModelProvider.java:169)
 at org.eclipse.jst.jee.model.internal.Web25ModelProvider.getModelObject(Web25ModelProvider.java:44)
 at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelObject(JEE5ModelProvider.java:215)
 at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadProviders(AbstractMergedModelProvider.java:261)
 at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.access$2(AbstractMergedModelProvider.java:255)
 at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider$LoadModelsWorkspaceRunnable.run(AbstractMergedModelProvider.java:278)
 at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
 at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadModel(AbstractMergedModelProvider.java:249)
 at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getMergedModel(AbstractMergedModelProvider.java:219)
 at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getModelObject(AbstractMergedModelProvider.java:139)
 at org.eclipse.jst.jee.ui.internal.navigator.Web25ContentProvider.getNewContentProviderInstance(Web25ContentProvider.java:69)
 at org.eclipse.jst.jee.ui.internal.navigator.LoadingJeeDDJob.run(LoadingJeeDDJob.java:50)
 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'taglib' not found. (platform:/resource/grch97/WEB-INF/web.xml, 891, 11)
 at org.eclipse.emf.ecore.xmi.impl.XMLHandler.reportUnknownFeature(XMLHandler.java:1985)
 at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleUnknownFeature(XMLHandler.java:1949)
 at org.eclipse.emf.ecore.xmi.impl.XMIHandler.handleUnknownFeature(XMIHandler.java:145)
 at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleFeature(XMLHandler.java:1893)
 at org.eclipse.emf.ecore.xmi.impl.XMLHandler.processElement(XMLHandler.java:1017)
 at org.eclipse.emf.ecore.xmi.impl.XMIHandler.processElement(XMIHandler.java:81)
 at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:995)
 at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:706)
 at org.eclipse.emf.ecore.xmi.impl.XMIHandler.startElement(XMIHandler.java:163)
 at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
 at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
 at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
 at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
 at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
 at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
 at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
 at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
 at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
 at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
 at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
 at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
 at javax.xml.parsers.SAXParser.parse(Unknown Source)
 at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:175)
 at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:240)
 at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1505)
 at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1284)
 at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:259)
 at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.demandLoad(ProjectResourceSetImpl.java:811)
 at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:274)
... 14 more
</code></pre>

blocks|key|1800707|text|我设法修复了这个问题，方法是从每个有问题的项目的.project文件中删除验证器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800708|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I managed to fix this by removing the validator out of the .project file for each of the projects that had the issue.

blocks|key|1800710|text|问题根本不是taglib，它只是Eclipse的一个糟糕的错误描述。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800711|它是项目方面与web.xml+dtd的对比。它们的版本必须匹配！|1800712|如果web.xml说：|1800713|<!DOCTYPE+web-app+PUBLIC+"-//Sun+Microsystems,+Inc.//DTD+Web+Application+2.3//EN"+"http://java.sun.com/dtd/web-app_2_3.dtd">|code-block|syntax|javascript|1800714|但是这个项目有一个|1800715|+"Dynamic+Web+Module+2.5"|1800716|则会出现此错误。将facet更改为2.3或将web.xml更改为2.5...换句话说:它们必须匹配..|1800717|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

The problem is not the taglib at all, it's just a bad error description by Eclipse.

it is the project facet vs. web.xml dtd.. their versions must match!

if the web.xml says:

<pre><code>&lt;!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"&gt;
</code></pre>

but the project has a 

<pre><code> "Dynamic Web Module 2.5"
</code></pre>

then this error will occur.. change facet to 2.3 or web.xml to 2.5... in other words: they must match..

blocks|key|1585845|text|我在使用eclipse4.3+(Kepler)，maven+3.1.0，tomcat6.0.37和jdk7+(也安装了jre6+)时遇到了类似的错误，我找到了一个解决方案来修复它，或者至少通过在eclipse中配置tomcat来摆脱繁琐的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1585846|在Preferences->Server->+Runtime+environment中，定义一个新的运行时环境"Apache+Tomcat6.0“，并从已安装的JRE中选择jre6安装。|1585847|然后在项目的属性中检查目标运行时。ApacheTomcatV6.0应该与Java+v1.6相关联(如果尚未定义，请按new并检查所选的JRE是否为java1.6运行时)。|1585848|希望能有所帮助|1585849|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I had a similar error using eclipse 4.3 (Kepler), maven 3.1.0, tomcat 6.0.37 and jdk7 (have also jre6 installed), and found a solution to fix it or at least to get rid of the tedious errors by configuring tomcat in eclipse.

In Preferences->Server-> Runtime Environments, define a new run time environment "Apache Tomcat 6.0" and select the jre6 installation from the installed JREs. 

Then review the Targeted Runtimes in the project's properties. Apache Tomcat v6.0 should be associated with Java Runtime Environment v1.6 (if not yet defined press new and check that the selected JRE is a java 1.6 runtime).

Hope it helps

blocks|key|1800731|text|在Eclipse+(ALT%2BF5)中更新maven项目时，我遇到了这个错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800732|web.xml|1800733|<web-app+xmlns="http://java.sun.com/xml/ns/javaee"+version="3.0"
++++xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"+++
++++schemaLocation="http://java.sun.com/xml/ns/javaee+
++++http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">|code-block|syntax|javascript|1800734|和项目方面|1800735|Dynamic+Web+Modul+3.0|1800736|以下是我可以修复它的方法：|1800737|从web-app元素中删除了所有xmls定义|offset|length|style|CODE|1800738|<web-app>|1800739|然后更新maven项目(ALT%2BF5)。|1800740|重新插入架构定义并重新更新项目(ALT%2BF5)。|1800741|entityMap^0|0|0|0|0|0|0|1|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@$Q|19|R|1A|S|T]]|9|@]|A|$]]|$1|U|3|V|5|F|7|1B|8|@]|9|@]|A|$G|H]]|$1|W|3|X|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1D|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

I ran into this error while trying to update a maven project in Eclipse (ALT+F5).

web.xml

<pre><code>&lt;web-app xmlns="http://java.sun.com/xml/ns/javaee" version="3.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"&gt;
</code></pre>

and project facet

<pre><code>Dynamic Web Modul 3.0
</code></pre>

Here is how I could fix it:

Removed all xmls-schema definition from the <code>web-app</code> element

<pre><code>&lt;web-app&gt;
</code></pre>

then update the maven project (ALT+F5).

Re-insert the schema definitions and re-update project (ALT+F5).

blocks|key|1800743|text|我能够将项目Java+facet更新到1.5，并且错误已经停止。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800744|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I was able to update the project Java facet to 1.5 and the errors stopped.

blocks|key|1800746|text|根据web-app_2_5.xsd中包含的jsp_2_1.xsd，标记库标签应该在jsp-config标签中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800747|<xsd:complexType+name="jsp-configType">
<xsd:annotation>
++<xsd:documentation>

The+jsp-configType+is+used+to+provide+global+configuration
information+for+the+JSP+files+in+a+web+application.+It+has
two+subelements,+taglib+and+jsp-property-group.

++</xsd:documentation>
</xsd:annotation>

<xsd:sequence>
++<xsd:element+name="taglib"
+++++++type="javaee:taglibType"
+++++++minOccurs="0"
+++++++maxOccurs="unbounded"/>
++<xsd:element+name="jsp-property-group"
+++++++type="javaee:jsp-property-groupType"
+++++++minOccurs="0"
+++++++maxOccurs="unbounded"/>
</xsd:sequence>
<xsd:attribute+name="id"+type="xsd:ID"/>|code-block|syntax|javascript|1800748|​|1800749|当我在js-config中包装taglib时，错误消失了。|1800750|<jsp-config>
++++<taglib>
++++++++<taglib-uri>http://www.springframework.org/tags/form</taglib-uri>
++++++++<taglib-location>/WEB-INF/taglibs/spring-form.tld</taglib-location>
++++</taglib>
</jsp-config>|1800751|以前的解析器可能更宽松。我的配置:+Eclipse露娜，内置maven+3.2.1，web.xml+2.5，动态Web+Project+facet2.5。|1800752|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

According to jsp_2_1.xsd included from web-app_2_5.xsd, taglib tag should be in jsp-config tag:

<pre><code>&lt;xsd:complexType name="jsp-configType"&gt;
&lt;xsd:annotation&gt;
 &lt;xsd:documentation&gt;

The jsp-configType is used to provide global configuration
information for the JSP files in a web application. It has
two subelements, taglib and jsp-property-group.

 &lt;/xsd:documentation&gt;
&lt;/xsd:annotation&gt;

&lt;xsd:sequence&gt;
 &lt;xsd:element name="taglib"
 type="javaee:taglibType"
 minOccurs="0"
 maxOccurs="unbounded"/&gt;
 &lt;xsd:element name="jsp-property-group"
 type="javaee:jsp-property-groupType"
 minOccurs="0"
 maxOccurs="unbounded"/&gt;
&lt;/xsd:sequence&gt;
&lt;xsd:attribute name="id" type="xsd:ID"/&gt;
</code></pre>



When I wrapped taglib in js-config, the error disappeared.

<pre><code>&lt;jsp-config&gt;
 &lt;taglib&gt;
 &lt;taglib-uri&gt;http://www.springframework.org/tags/form&lt;/taglib-uri&gt;
 &lt;taglib-location&gt;/WEB-INF/taglibs/spring-form.tld&lt;/taglib-location&gt;
 &lt;/taglib&gt;
&lt;/jsp-config&gt;
</code></pre>

Previous parsers were probably more lenient. My config: Eclipse Luna, built-in maven 3.2.1, web.xml 2.5, Dynamic Web Project facet 2.5.

blocks|key|1800758|text|在我的例子中，这个问题通过使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1800759|org.eclipse.emf.ecore.xmi_2.10.2.v20150123-0348、org.eclipse.emf.ecore.xmi.source_2.10.2.v20150123-0348、org.eclipse.emf.ecore.xmi_2.10.2.v20150123-0348、org.eclipse.emf.ecore.xmi.source_2.10.2.v20150123-0348和org.eclipse.emf.common_2.10.1.v20150123-0348|offset|length|style|CODE|1800760|构建路径中的jars。尽管出现了新版本，但旧版本的早期jars仍在使用。|1800761|entityMap^0|0|0|1B|1C|1I|2V|1B|47|1I|5Q|18|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]|$D|T|E|U|F|G]|$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$]]

In my case, this problem got resolved by using the version 

<code>org.eclipse.emf.ecore.xmi_2.10.2.v20150123-0348</code> and <code>org.eclipse.emf.ecore.xmi.source_2.10.2.v20150123-0348</code> and 
<code>org.eclipse.emf.ecore.xmi_2.10.2.v20150123-0348</code> and
<code>org.eclipse.emf.ecore.xmi.source_2.10.2.v20150123-0348</code> and
<code>org.eclipse.emf.common_2.10.1.v20150123-0348</code> 

jars in the build path.
 Earlier jars of old version were being used inspite of new version present.

blocks|key|1585897|text|右键单击Eclipse中的项目->+Build+Path+->+Configure+Build+Path+->+project+Facets+->取消选中Dynamic+Web+Module|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1585898|注意:只要您不打算在eclipse中通过嵌入式应用程序服务器运行web-app，这种方法就很好。|1585899|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Right click on the project in Eclipse -> Build Path -> Configure Build Path -> Project Facets -> Uncheck Dynamic Web Module

Note: This approach is good as long you dont plan to run the web-app from within eclipse thru an embedded app server.

I have built my project with maven
All builds successful and eclipse properties generation is also successful

But when I open the project in Eclipse 4, I am getting this error

<pre><code>An internal error occurred during: "Loading descriptor for SALYExplorer.".
org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'taglib' not found. (platform:/resource/SALYExplorer/src/main/webapp/WEB-INF/web.xml, 313, 10)
</code></pre>

At that location I have some properties 

Though the project runs smoothly and everything is fine, just while exploring the project in Navigation pane, Eclipse always throws this error box (quite annoying).

COde at that location

<pre><code>&lt;taglib&gt;
 &lt;taglib-uri&gt;xx.tld&lt;/taglib-uri&gt;
 &lt;taglib-location&gt;/WEB-INF/tld/xx.tld&lt;/taglib-location&gt;
&lt;/taglib&gt;
</code></pre>

and xx definations int it's file

<pre><code>&lt;!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
 "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_2.dtd"&gt;
&lt;taglib&gt;

 &lt;tlib-version&gt;1.0&lt;/tlib-version&gt;
 &lt;jsp-version&gt;1.2&lt;/jsp-version&gt;
.........
&lt;/taglib&gt;
</code></pre>

Eclipse FeatureNotFoundException

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我已经用maven构建了我的项目所有构建都成功了，eclipse属性生成也成功了。但是当我在Eclipse4中打开这个项目时，我得到了这个错误An internal error occurred during: "Loading descriptor for SALYExplorer.".org.eclipse.emf...

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