My guess is that 
http://devmaster:8081/nexus/content/groups/public/commons-io/commons-io/1.4/commons-io-1.4.sha1
 doesn't return an HTTP 404, but a nice looking html saying the resource 
doesn't exist?

Maarten



________________________________
From: Jim Garrison <jim.garri...@troux.com>
To: "ivy-user@ant.apache.org" <ivy-user@ant.apache.org>
Sent: Thursday, June 30, 2011 11:16 PM
Subject: Ivy confused about sha1 vs md5 checksums?

We just started getting the following error when resolving from a local 
repository:

[ivy:resolve] :: problems summary ::
[ivy:resolve] :::: WARNINGS
[ivy:resolve]           [FAILED     ] commons-io#commons-io;1.4!commons-io.jar: 
invalid sha1: expected=<!doctype 
computed=a8762d07e76cfde2395257a5da47ba7c1dbd3dce (827ms)
[ivy:resolve]           [FAILED     ] commons-io#commons-io;1.4!commons-io.jar: 
invalid sha1: expected=<!doctype 
computed=a8762d07e76cfde2395257a5da47ba7c1dbd3dce (827ms)
[ivy:resolve]   ==== public: tried
[ivy:resolve]    
http://devmaster:8081/nexus/content/groups/public/commons-io/commons-io/1.4/commons-io-1.4.jar

devmaster is a local caching Nexus server.

commons-io.jar has only md5 checksums in Maven Central, not sha1.  I purged the 
locally cached copy from devmaster and tried again but got the same error.

After a little digging through the Ivy docs, I added the following line to 
ivysettings.xml:

      <property name="ivy.checksums" value="md5,sha1"/>

to force Ivy to try md5 first, which fixed the problem.

It looks like Ivy is somehow being fooled into thinking it needs to verify an 
sha1 sum when no such checksum exists.  Known problem?

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