確定根異常？

對於給定的異常堆棧，如何獲得根異常（說它是UnknownHostException）？確定根異常？

[java] org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: Couldn't send message. 
[java] org.codehaus.xfire.fault.XFireFault: Couldn't send message. 
[java]  at org.codehaus.xfire.fault.XFireFault.createFault(XFireFault.java:89) 
[java]  at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:30) 
[java]  at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131) 
[java]  at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:79) 
[java]  at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:114) 
[java]  at org.codehaus.xfire.client.Client.invoke(Client.java:336) 
[java]  at org.codehaus.xfire.client.XFireProxy.handleRequest(XFireProxy.java:77) 
[java]  at org.codehaus.xfire.client.XFireProxy.invoke(XFireProxy.java:57) 
[java]  at $Proxy12.findICPInfoToObject(Unknown Source) 
[java]  at com.sinoi.icp.impl.ICPInfoFinderImpl.findByDomainName(Unknown Source) 
[java]  at com.sinoi.icp.IcpFinderDemo.main(Unknown Source) 
[java] Caused by: org.codehaus.xfire.XFireException: Couldn't send message. 
[java]  at org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:145) 
[java]  at org.codehaus.xfire.transport.http.HttpChannel.send(HttpChannel.java:48) 
[java]  at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26) 
[java]  ... 9 more 
[java] Caused by: java.net.UnknownHostException: icpinfo.137.300.cn 
[java]  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195) 
[java]  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) 
[java]  at java.net.Socket.connect(Socket.java:529) 
[java]  at java.net.Socket.connect(Socket.java:478) 
[java]  at java.net.Socket.<init>(Socket.java:375) 
[java]  at java.net.Socket.<init>(Socket.java:249) 
[java]  at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80) 
[java] 
[java]  at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122) 
[java] 
[java]  at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)

來源

2011-07-29 rmn190

你是什麼意思的上漲？ –

這裏有一個樣品的方法來做到這一點：

public static Throwable getRoot(Throwable t) { 
    Throwable result = t; 

    while (result.getCause() != null) { 
     result = result.getCause(); 
    } 

    return result; 
}

來源

2011-07-29 02:15:11

@ rmn190感謝是不夠的，你需要通過點擊右邊的勾號來接受答案 – Shahzeb

你可以嘗試捕捉異常和做：

e.getCause();

來源

2011-07-29 02:14:41

確定根異常？

回答

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