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Subject: Re: Classloading issue
From: =?iso-8859-1?Q?Nicolas_Lalev=E9e?= <nicolas.lalevee@hibnet.org>
In-Reply-To: <E5947984-6BD1-470E-8F0F-5254AA8BB971@gmx.de>
Date: Mon, 12 May 2014 01:51:12 +0200
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References: <EB62861A-D248-4035-B7F5-6BEAF0BC6EBF@hibnet.org>
 <E5947984-6BD1-470E-8F0F-5254AA8BB971@gmx.de>
To: "Ant Developers List" <dev@ant.apache.org>


Le 12 mai 2014 =E0 01:34, Antoine Levy Lambert <antoine@gmx.de> a =E9crit =
:

> Hello Nicolas,
>=20
> I have tried your test case and it is failing as you except :
>=20
> BUILD FAILED
> /Users/antoine/dev/asf/ivyde-trunk/test/ssh-resolver/build.xml:27: =
java.lang.NoClassDefFoundError: =
com/jcraft/jsch/agentproxy/AgentProxyException
> 	at =
org.apache.ivy.plugins.repository.ssh.AbstractSshBasedRepository.getSessio=
n(AbstractSshBasedRepository.java:108)
> 	at =
org.apache.ivy.plugins.repository.ssh.SshRepository.resolveResource(SshRep=
ository.java:82)
> 	at =
org.apache.ivy.plugins.repository.ssh.SshResource.resolve(SshResource.java=
:101)
>=20
> The line 108 in AbstractSsshBasedRepository contains this :
>=20
>       return SshCache.getInstance().getSession(host, port, user, =
userPassword, getKeyFile(),
>           getKeyFilePassword(), getPassFile(), isAllowedAgentUse());
>=20
> getSession is a method which calls attemptAgentUse.

It is only called is attemptAgentUse is true. In our case it is false.

> Does this explain why an attempt to load AgentProxyException happens =
at that time ?

I have plugged a debugger, and the class loading exception is raised on =
the call of SshCache.getInstance(). As far as I can tell, it is the =
class SshCache which fails to load, but I don't understand why.

Nicolas

>=20
> Regards,
>=20
> Antoine
>=20
> On May 11, 2014, at 5:41 PM, Nicolas Lalev=E9e =
<nicolas.lalevee@hibnet.org> wrote:
>=20
>> Hi,
>>=20
>> I need some help to understand a bug around classloading (nothing =
that particular to Ivy).
>>=20
>> I was looking into IVY-1471 [1] and I don't understand why it is =
failing that way. In the classpath there are both Ivy and Jsch, but not =
the optional jar related to managing the ssh agent via jsch. And it is =
failing because a class in that optional jar is not found. But I don't =
understand why the classloader is looking for it in the first place.
>>=20
>> The error is raised is AbstractSshBasedRepository, on the call of =
SshCache.getInstance() [2]. But as far as I can tell, nothing in the =
loading of the SshCache [3] class requires AgentProxyException. The =
class is only needed by the function SshCache#attemptAgentUse() [4], =
which will be called at runtime, if the end user actually want ssh agent =
support, in which case it would naturally fail. But here it fails very =
earlier.
>>=20
>> I have made a test case you can test with its build.xml, no IvyDE =
required there [5].
>>=20
>> Am I missing something ? Is there a special treatment for the loading =
of Exception classes ?
>>=20
>> Nicolas
>>=20
>> [1] https://issues.apache.org/jira/browse/IVY-1471
>> [2] =
https://fisheye6.atlassian.com/browse/ant/ivy/core/trunk/src/java/org/apac=
he/ivy/plugins/repository/ssh/AbstractSshBasedRepository.java?hb=3Dtrue#to=
108
>> [3] =
https://fisheye6.atlassian.com/browse/ant/ivy/core/trunk/src/java/org/apac=
he/ivy/plugins/repository/ssh/SshCache.java?hb=3Dtrue
>> [4] =
https://fisheye6.atlassian.com/browse/ant/ivy/core/trunk/src/java/org/apac=
he/ivy/plugins/repository/ssh/SshCache.java?hb=3Dtrue#to300
>> [5] =
http://svn.apache.org/repos/asf/ant/ivy/ivyde/trunk/test/ssh-resolver/
>>=20
>>=20
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>>=20
>=20
>=20
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>=20


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