使用JSP使用嵌入式Jetty会出现错误“；web-jsptaglibrary“未找到1.dtd”；

我正在使用嵌入式Jetty启动一个webapp，并使用JSP页面作为视图

使用maven jetty插件可以很好地进行测试，这让我觉得在引导服务器时缺少了一些依赖项（这是问题的根本原因）

I使用命令引导Jetty：

java $JAVA_OPTS -cp target/classes:target/dependency/* xxx.Main

我在Maven中使用了依赖插件，以确保获得类路径上的所有DEP（打包war文件之外）：

嵌入式Jetty服务器启动时没有错误，但是当导航到返回JSP页面的URL时，我总是会遇到此错误

堆栈跟踪：

PWC6181: File /javax/servlet/jsp/resources/web-jsptaglibrary_1_2.dtd not found

Caused by:

org.xml.sax.SAXException: PWC6181: File /javax/servlet/jsp/resources/web-jsptaglibrary_1_2.dtd not found
at org.apache.jasper.xmlparser.MyEntityResolver.resolveEntity(ParserUtils.java:566)
at com.sun.org.apache.xerces.internal.util.EntityResolverWrapper.resolveEntity(EntityResolverWrapper.java:107)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntityAsPerStax(XMLEntityManager.java:1018)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1192)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1090)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1003)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:235)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
at org.apache.jasper.xmlparser.ParserUtils.parseXMLDocument(ParserUtils.java:296)
at org.apache.jasper.xmlparser.ParserUtils.parseXMLDocument(ParserUtils.java:366)
at org.apache.jasper.runtime.TldScanner.scanTld(TldScanner.java:526)
at org.apache.jasper.runtime.TldScanner.scanJar(TldScanner.java:379)
at org.apache.jasper.runtime.TldScanner.scanJars(TldScanner.java:607)
at org.apache.jasper.runtime.TldScanner.scanTlds(TldScanner.java:282)
at org.apache.jasper.runtime.TldScanner.getLocation(TldScanner.java:255)

我使用Jetty 8，我的web.xml配置为Servlet 3.0

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

---

我发现缺少dtd文件的问题在于我需要Jetty JSP JAR

当JSP支持不起作用时，我正在使用这些依赖项：

<dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.web</groupId>
        <artifactId>jsp-impl</artifactId>
        <version>2.2</version>
    </dependency>

javax.servlet.jsp
jsp api
2.2
org.glassfish.web
jsp impl
2.2

Jetty runner一直为我工作，所以我查看了jar文件中的依赖项

<dependency>
    <groupId>org.eclipse.jetty.orbit</groupId>
    <artifactId>javax.servlet.jsp</artifactId>
    <version>2.2.0.v201112011158</version>
</dependency>
<dependency>
    <groupId>org.eclipse.jetty.orbit</groupId>
    <artifactId>org.apache.jasper.glassfish</artifactId>
    <version>2.2.2.v201112011158</version>
</dependency>

org.eclipse.jetty.orbit
javax.servlet.jsp
2.2.0.v201112011158
org.eclipse.jetty.orbit
org.apache.jasper.glassfish
2.2.2.v201112011158

在javax.servlet.jsp依赖关系中，缺少的dtd文件存在，因此当我开始使用它们时，问题就消失了

所以我想问题是我需要Jetty特定的JSP依赖项，而不是一般的依赖项。有人能解释一下为什么Jetty是这样实施的吗

<dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.web</groupId>
        <artifactId>jsp-impl</artifactId>
        <version>2.2</version>
    </dependency>

<dependency>
    <groupId>org.eclipse.jetty.orbit</groupId>
    <artifactId>javax.servlet.jsp</artifactId>
    <version>2.2.0.v201112011158</version>
</dependency>
<dependency>
    <groupId>org.eclipse.jetty.orbit</groupId>
    <artifactId>org.apache.jasper.glassfish</artifactId>
    <version>2.2.2.v201112011158</version>
</dependency>