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Subject: DO NOT REPLY [Bug 48833] NPE in <get>
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Date: Mon,  1 Mar 2010 16:18:21 +0000 (UTC)

https://issues.apache.org/bugzilla/show_bug.cgi?id=48833

--- Comment #1 from Steve Loughran <stevel@apache.org> 2010-03-01 16:18:21 UTC ---
I thought this could be triggered by a null connection, added a check for that,
but no. This is being triggered by something in Sun's code. If you search for 
NullPointerException sun.net.www.ParseUtil.toURI

you can see that we are not the only group to encounter it. 

Propose: catch the exception, turn to a BuildException listing the URL at
fault. 

This turns the error into (at normal levels)
build.xml:176: Failed to parse http:localhost:8081/hadoop.site.xml

which lets people debug the problem

At -verbose you get

Failed to parse http:localhost:8081/hadoop.site.xml
    at org.apache.tools.ant.taskdefs.Get$GetThread.openConnection(Get.java:668)
    at org.apache.tools.ant.taskdefs.Get$GetThread.get(Get.java:581)
    at org.apache.tools.ant.taskdefs.Get$GetThread.run(Get.java:571)
Caused by: java.lang.NullPointerException
    at sun.net.www.ParseUtil.toURI(ParseUtil.java:261)
    at
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:795)
    at
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:726)
    at org.apache.tools.ant.taskdefs.Get$GetThread.openConnection(Get.java:665)
    ... 2 more

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