jetty-9.3.3 上的 JSP 编译错误

Question

我有一个在嵌入式 Jetty-7.6.8 (jdk-6) 上运行的 webapp 应用程序，但由于浏览器上的 Diffe-Hellman 错误，我们决定迁移到更新版本的 Jetty。所以，我们搬到了 Jetty-9.3.3。由于 Jetty-9.x 需要 jdk-8，我也升级了 jdk。现在码头启动没有错误，但是当我尝试访问我的登录页面时，我得到一个无法编译的jsp错误。

这些是依赖项：

-org.eclipse.jetty.apache-jsp-9.3.3.v20150827.jar
-org.mortbay.jasper.apache-el-8.0.23.M1.jar 
-org.mortbay.jasper.apache-jsp-8.0.23.M1.jar
-org.eclipse.jetty.orbit.org.eclipse.jdt.core-3.8.2.v20130121.jar
-jetty-continuation-9.3.3.v20150827.jar 
-jetty-http-9.3.3.v20150827.jar
-jetty-io-9.3.3.v20150827.jar 
-jetty-security-9.3.3.v20150827.jar
-jetty-server-9.3.3.v20150827.jar 
-jetty-servlet-9.3.3.v20150827.jar
-jetty-util-9.3.3.v20150827.jar 
-jetty-webapp-9.3.3.v20150827.jar
-jetty-xml-9.3.3.v20150827.jar
-servlet-api-3.1.jar

日志/浏览器出现的错误：

HTTP ERROR 500

Problem accessing /xdadm/test.jsp. Reason:

Server Error

Caused by:

org.apache.jasper.JasperException: Unable to compile class for JSP
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:600)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:816)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1686)
at com.xcom.filter.RequestHandler.doFilter(RequestHandler.java:91)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1156)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1088)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
at org.eclipse.jetty.server.Server.handle(Server.java:517)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:306)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:245)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:192)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:245)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.NullPointerException
at org.apache.jasper.compiler.Validator$ValidateVisitor.<init>(Validator.java:515)
at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1853)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
... 33 more

请提供有关问题所在的任何线索或建议。 TIA

Answer 1

我添加了所有这些依赖后问题就解决了：

 jetty-lib/apache-jsp/org.eclipse.jetty.apache-jsp-9.3.8.v20160314.jar
 jetty-lib/apache-jsp/org.mortbay.jasper.apache-jsp-8.0.27.jar
 jetty-lib/apache-jsp/org.eclipse.jdt.core.compiler.ecj-4.4.2.jar
 jetty-lib/apache-jsp/org.mortbay.jasper.apache-el-8.0.27.jar
 jetty-lib/jetty-annotations-9.3.8.v20160314.jar jetty-lib/jetty-continuation-9.3.8.v20160314.jar
 jetty-lib/jetty-http-9.3.8.v20160314.jar jetty-lib/jetty-io-9.3.8.v20160314.jar
 jetty-lib/jetty-plus-9.3.8.v20160314.jar jetty-lib/jetty-security-9.3.8.v20160314.jar
 jetty-lib/jetty-server-9.3.8.v20160314.jar jetty-lib/jetty-servlet-9.3.8.v20160314.jar
 jetty-lib/jetty-util-9.3.8.v20160314.jar jetty-lib/jetty-webapp-9.3.8.v20160314.jar
 jetty-lib/jetty-xml-9.3.8.v20160314.jar  jetty-lib/servlet-api-3.1.jar
 jetty-lib/setuid/jetty-setuid-java-1.0.3.jar

它是这样的：

jetty-lib/
├── apache-jsp
│   |── org.eclipse.jdt.core.compiler.ecj-4.4.2.jar
│   ├── org.eclipse.jetty.apache-jsp-9.3.8.v20160314.jar
│   ├── org.mortbay.jasper.apache-el-8.0.27.jar
│   └── org.mortbay.jasper.apache-jsp-8.0.27.jar
├── jetty-annotations-9.3.8.v20160314.jar
├── jetty-continuation-9.3.8.v20160314.jar
├── jetty-http-9.3.8.v20160314.jar
├── jetty-io-9.3.8.v20160314.jar
├── jetty-plus-9.3.8.v20160314.jar
├── jetty-security-9.3.8.v20160314.jar
├── jetty-server-9.3.8.v20160314.jar
├── jetty-servlet-9.3.8.v20160314.jar
├── jetty-util-9.3.8.v20160314.jar
├── jetty-webapp-9.3.8.v20160314.jar
├── jetty-xml-9.3.8.v20160314.jar
├── servlet-api-3.1.jar
└── setuid
    ├── 32libsetuid-linux.so
    ├── jetty-setuid-java-1.0.3.jar
    └── libsetuid-linux.so

PS：我已经从 9.3.3 移到了 9.3.8

Answer 2

Embedded Jetty Server 9.4.15 和 JSP 支持也有同样的问题。 解决方案很简单：https://www.eclipse.org/jetty/documentation/current/embedded-examples.html#embedded-webapp-jsp

你必须启用 AnnotationConfiguration ：

// This webapp will use jsps and jstl. We need to enable the
// AnnotationConfiguration in order to correctly
// set up the jsp container
Configuration.ClassList classlist = Configuration.ClassList
            .setServerDefault( server );
classlist.addBefore(
            "org.eclipse.jetty.webapp.JettyWebXmlConfiguration",
            "org.eclipse.jetty.annotations.AnnotationConfiguration" );

Answer 3

一段时间以来，我一直遇到同样的错误。所以对于遇到同样错误的人来说，答案正是其他人指出的——依赖管理。

如果您看到Caused by: java.lang.NullPointerException at org.apache.jasper.compiler.Validator$ValidateVisitor.<init>(Validator.java:515)，这是由于 Apache Jasper 引擎未能检测/加载标签库造成的。

换句话说，您在某处缺少 taglibs 依赖或其 API 或其实现。

确保以下所有依赖项/JAR 都在您的 POM 中

    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-jsp</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.mortbay.jasper</groupId>
        <artifactId>apache-el</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.mortbay.jasper</groupId>
        <artifactId>apache-jsp</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.mortbay.jasper</groupId>
        <artifactId>jasper-jsp</artifactId>
        <type>pom</type>
    </dependency>
    <dependency>
        <groupId>org.apache.taglibs</groupId>
        <artifactId>taglibs-standard-impl</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.taglibs</groupId>
        <artifactId>taglibs-standard-spec</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>apache-jsp</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>apache-jstl</artifactId>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-annotations</artifactId>
        <scope>compile</scope>
    </dependency>

如果您将 WAR 隐藏到 FAT jar 中，如果依赖项的范围不同（编译与运行时），那么您将面临另一个痛苦的世界，那么依赖项的顺序很重要，否则您将开始获得相同的NullPointerException。

Answer 4

从 Jetty 8.1 升级到 9.4 时，我遇到了完全相同的问题。就我而言，这不是缺少依赖项，而是太多或冲突的依赖项。在我从类路径中删除以下工件后，问题就消失了：

• org.mortbay.jasper.apache-jsp
• org.mortbay.jasper.apache-el

Answer 5

Jetty 项目维护了一个示例项目，供 JSP 在 Embedded-jetty 中使用。

见：github.com/jetty-project/embedded-jetty-jsp

您需要解决的问题：

• 使用构建工具！ （这是此答案最重要的方面，仅此一项就可以解决您 3/4 的问题）
• 修复您的依赖关系

例子：

[embedded-jetty-jsp]$ mvn dependency:tree
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building embedded-jetty-jsp 1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ embedded-jetty-jsp ---
[INFO] org.eclipse.jetty.demo:embedded-jetty-jsp:jar:1-SNAPSHOT
[INFO] +- javax.servlet:javax.servlet-api:jar:3.1.0:compile
[INFO] +- org.eclipse.jetty:jetty-annotations:jar:9.3.3.v20150827:compile
[INFO] |  +- org.eclipse.jetty:jetty-plus:jar:9.3.3.v20150827:compile
[INFO] |  |  \- org.eclipse.jetty:jetty-jndi:jar:9.3.3.v20150827:compile
[INFO] |  +- javax.annotation:javax.annotation-api:jar:1.2:compile
[INFO] |  +- org.ow2.asm:asm:jar:5.0.1:compile
[INFO] |  \- org.ow2.asm:asm-commons:jar:5.0.1:compile
[INFO] |     \- org.ow2.asm:asm-tree:jar:5.0.1:compile
[INFO] +- org.eclipse.jetty:jetty-webapp:jar:9.3.3.v20150827:compile
[INFO] |  +- org.eclipse.jetty:jetty-xml:jar:9.3.3.v20150827:compile
[INFO] |  \- org.eclipse.jetty:jetty-servlet:jar:9.3.3.v20150827:compile
[INFO] |     \- org.eclipse.jetty:jetty-security:jar:9.3.3.v20150827:compile
[INFO] +- org.eclipse.jetty:apache-jsp:jar:9.3.3.v20150827:compile
[INFO] |  +- org.eclipse.jetty:jetty-util:jar:9.3.3.v20150827:compile
[INFO] |  +- org.eclipse.jetty:jetty-server:jar:9.3.3.v20150827:compile
[INFO] |  |  +- org.eclipse.jetty:jetty-http:jar:9.3.3.v20150827:compile
[INFO] |  |  \- org.eclipse.jetty:jetty-io:jar:9.3.3.v20150827:compile
[INFO] |  +- org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1.M0:compile
[INFO] |  +- org.mortbay.jasper:apache-jsp:jar:8.0.23.M1:compile
[INFO] |  |  \- org.mortbay.jasper:apache-el:jar:8.0.23.M1:compile
[INFO] |  \- org.eclipse.jetty.orbit:org.eclipse.jdt.core:jar:3.8.2.v20130121:compile
[INFO] \- org.eclipse.jetty:apache-jstl:pom:9.3.3.v20150827:compile
[INFO]    +- org.apache.taglibs:taglibs-standard-spec:jar:1.2.1:compile
[INFO]    \- org.apache.taglibs:taglibs-standard-impl:jar:1.2.1:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.884 s
[INFO] Finished at: 2015-09-15T05:37:53-07:00
[INFO] Final Memory: 13M/481M
[INFO] ------------------------------------------------------------------------

• 正确设置您的 JSP 环境。

  注意：

  • 实例管理器设置
  • 温度/暂存目录
  • ContainerIncludeJarPattern
  • 容器初始化器
  • JettyJasperInitializer
  • 非系统类加载器要求
  • JasperServlet 的设置
  • DefaultServlet 的设置