带有嵌入式码头的Webapp给出异常

Question

我正在尝试使用 Java 7 和 Jetty 9.1.3 维护一个使用嵌入式码头独立运行的 Java Web 应用程序。除了其中一个 JSP 页面中的所有链接之外，一切都运行。该页面上的每个链接都应该获取 png 文件或文本文件并将其显示在链接下方。通过 Netbeans 运行时，每个链接在单击时都会挂起，并且控制台会给出以下错误：

Apr 10, 2014 4:23:34 PM org.apache.struts.chain.commands.AbstractExceptionHandler execute
WARNING: Unhandled exception
java.lang.IllegalStateException: Form too many keys
at org.eclipse.jetty.util.UrlEncoded.decodeUtf8To(UrlEncoded.java:526)
at org.eclipse.jetty.util.UrlEncoded.decodeTo(UrlEncoded.java:625)
at org.eclipse.jetty.server.Request.extractParameters(Request.java:344)
at org.eclipse.jetty.server.Request.getParameterNames(Request.java:852)
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:426)
at org.apache.struts.chain.commands.servlet.PopulateActionForm.populate(PopulateActionForm.java:50)
at org.apache.struts.chain.commands.AbstractPopulateActionForm.execute(AbstractPopulateActionForm.java:60)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:711)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1112)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:479)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1046)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:462)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:281)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.lang.Thread.run(Thread.java:744)

Apr 10, 2014 4:23:34 PM org.apache.struts.chain.commands.ExceptionCatcher postprocess
WARNING: Exception from exceptionCommand 'servlet-exception'
java.lang.IllegalStateException: Form too many keys
at org.eclipse.jetty.util.UrlEncoded.decodeUtf8To(UrlEncoded.java:526)
at org.eclipse.jetty.util.UrlEncoded.decodeTo(UrlEncoded.java:625)
at org.eclipse.jetty.server.Request.extractParameters(Request.java:344)
at org.eclipse.jetty.server.Request.getParameterNames(Request.java:852)
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:426)
at org.apache.struts.chain.commands.servlet.PopulateActionForm.populate(PopulateActionForm.java:50)
at org.apache.struts.chain.commands.AbstractPopulateActionForm.execute(AbstractPopulateActionForm.java:60)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:711)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1112)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:479)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1046)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:462)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:281)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.lang.Thread.run(Thread.java:744)

2014-04-10 16:23:34.438:WARN:oejs.ServletHandler:qtp2008751570-30: 
javax.servlet.ServletException: java.lang.IllegalStateException: Form too many keys
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:711)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1112)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:479)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1046)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:462)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:281)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.lang.Thread.run(Thread.java:744)
Caused by: 
java.lang.IllegalStateException: Form too many keys
at org.eclipse.jetty.util.UrlEncoded.decodeUtf8To(UrlEncoded.java:526)
at org.eclipse.jetty.util.UrlEncoded.decodeTo(UrlEncoded.java:625)
at org.eclipse.jetty.server.Request.extractParameters(Request.java:344)
at org.eclipse.jetty.server.Request.getParameterNames(Request.java:852)
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:426)
at org.apache.struts.chain.commands.servlet.PopulateActionForm.populate(PopulateActionForm.java:50)
at org.apache.struts.chain.commands.AbstractPopulateActionForm.execute(AbstractPopulateActionForm.java:60)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:711)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1112)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:479)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1046)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:462)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:281)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.lang.Thread.run(Thread.java:744)

我做了一些研究，发现这经常（或总是）与默认码头参数的表格太大有关。建议的修复是通过创建一个名为 jetty-web.xml 的 xml 文件并将其放置在 web/WEB-INF 文件夹中来覆盖默认值。这是我新创建的 jetty-web.xml：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE Configure PUBLIC
"-//Eclipse//DTD Configure//EN"
"http://jetty.eclipse.org/configure.dtd">

<Configure id="WebAppContext" class="org.eclipse.jetty.webapp.WebAppContext">
   <Set name="maxFormContentSize">600000</Set>
   <Set name="maxFormKeys">20000</Set>
</Configure>

我用这个文件重建了网络应用程序，但它没有解决问题。我尝试使用更大的数字，但似乎没有效果。我对 jetty 甚至嵌入式 jetty 与 java 交互的底层方式不够熟悉，不知道接下来要尝试什么。

我很乐意从有问题的 JSP 页面或支持处理请求的 Java 代码中发布任何代码，但我认为现在控制台错误可能就足够了。非常感谢您的帮助。

Answer 1

试试

-Dorg.eclipse.jetty.server.Request.maxFormKeys=2000

在 jvm 参数中

Answer 2

对于码头 9.2 您可以为单个 Web 应用程序配置表单限制。 在这种情况下，必须使用以下方法配置上下文处理程序（或 webappContext）实例：

ContextHandler.setMaxFormContentSize(int maxSizeInBytes);
ContextHandler.setMaxFormKeys(int formKeys);    

这些方法可以在嵌入 jetty 时直接调用，但更常见的是从上下文 XML 文件或 WEB-INF/jetty-web.xml 文件配置：

<Configure class="org.eclipse.jetty.webapp.WebAppContext">

  ...

  <Set name="maxFormContentSize">200000</Set>
  <Set name="maxFormKeys">2000</Set>
</Configure>    

您可以为服务器配置表单限制

如果上下文没有配置特定的表单限制，则检查服务器属性以查看是否在大小或键上设置了服务器范围的限制。以下 XML 显示了如何在 jetty.xml 中设置这些属性：

<configure class="org.eclipse.jetty.server.Server">

  ...

  <Call name="setAttribute">
    <Arg>org.eclipse.jetty.server.Request.maxFormContentSize</Arg>
    <Arg>100000</Arg>
   </Call>
  <Call name="setAttribute">
    <Arg>org.eclipse.jetty.server.Request.maxFormKeys</Arg>
    <Arg>2000</Arg>
   </Call>
</configure>