我正在尝试向嵌入在Pax Web OSGi容器中的Jetty 8注册一个自定义错误处理程序。我将以下基本xml配置添加到jetty.xml文件中:
<Call name="addBean">
<Arg>
<New class="my.custom.handler">
<Set name="server"><Ref id="Server"/></Set>
</New>
</Arg>
</Call>
但是,在此配置之后,Jetty无法启动,并且我从日志文件中得到以下根本原因的错误消息:
Caused by: java.lang.NoSuchMethodException: class my.error.handler.MyErrorHandler.setServer(class org.ops4j.pax.web.service.jetty.internal.JettyServerWrapper)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.set(XmlConfiguration.java:592)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:396)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:827)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1141)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:1044)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.call(XmlConfiguration.java:735)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:400)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:334)[70:org.eclipse.jetty.aggregate.jetty-all-server:8.1.19.v20160209]
at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:281)
... 16 more
看来Pax用JettyServerWrapper包装了Jetty的Server类,并且无法使用xml配置中的Reflection来设置。当我深入研究Jetty源代码时,我发现此代码与xml中的反射配置有关:
来自org.eclipse.jetty.xml.XmlConfiguration的内部类JettyXmlConfiguration:
private void set(Object obj, XmlParser.Node node) throws Exception
{
...
// Try for trivial match
try
{
Method set = oClass.getMethod(name,vClass);
set.invoke(obj,arg);
return;
}
...
}
从代码中可以明显看出,XmlConfiguration的set方法仅尝试获取具有特定类型的方法,而不查找父类。这就是为什么不能在自定义错误处理程序上设置Pax包装的Server实例的原因。
因此,无法使用xml配置Jetty。你有什么解决方案?
最佳答案
您可以在文档中找到有关如何配置Jetty的描述:
http://ops4j.github.io/pax/web/SNAPSHOT/User-Guide.html#adding-specialized-contexthandlers
此外,这是一个快速总结:
<Get name="handler">
<Call name="addHandler">
<Arg>
<New class="org.eclipse.jetty.servlet.ServletContextHandler">
<Set name="contextPath">/app</Set>
<Set name="resourceBase">/path/to/your/share</Set>
<Call name="addServlet">
<Arg>org.eclipse.jetty.servlet.DefaultServlet</Arg>
<Arg>/</Arg>
</Call>
</New>
</Arg>
</Call>
</Get>
无需以定义启动方式的方式配置Jetty,而是需要“适应”正在运行的实例。
关于java - Pax Web中的 jetty 错误处理程序注册错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46543504/