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From "PandaMonkey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7799) Dependency Conflict : Conlicting JARs org.apache.httpcomponents:httpclient
Date Fri, 23 Feb 2018 13:54:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-7799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374366#comment-16374366
] 

PandaMonkey commented on IGNITE-7799:
-------------------------------------

[~vkulichenko] I accept that you close the issue. Maven doesn't know which version is actual
required by your project. 

If ignite depends on the methods of com.amazonaws:aws-java-sdk-core, at the same time, those
invoked methods need the features definded in httpclient:4.5.2. The problem will appear.

Btw, nearly all the dependency conflict errors can not be detected during compiling process.

> Dependency Conflict : Conlicting JARs org.apache.httpcomponents:httpclient
> --------------------------------------------------------------------------
>
>                 Key: IGNITE-7799
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7799
>             Project: Ignite
>          Issue Type: Bug
>          Components: aws
>    Affects Versions: 2.5
>            Reporter: PandaMonkey
>            Priority: Minor
>             Fix For: 3.0
>
>
> Hi, by analyzing ignite-master\modules\aws\pom.xml, I found that there are two versions
of *org.apache.httpcomponents:httpclient*. Their introduced path is:
>  # org.apache.ignite:ignite-aws:2.5.0-SNAPSHOT::null->com.amazonaws:aws-java-sdk-core:1.11.75::compile->org.apache.httpcomponents:httpclient:4.5.2::compile
>  # org.apache.ignite:ignite-aws:2.5.0-SNAPSHOT::null->org.apache.httpcomponents:httpclient:4.5.1::compile
> Of them, httpclient:4.5.2 is the transitive dependency, and httpclient:4.5.1 is the
direct dependency. By further analyzing the source code, we found they have different features.
> Maven provides the version arbitration mechanism-----"nearest wins", and then your project
will explicitly use the older version: httpclient:4.5.1. The problem will arise when Ignite uses
the methods defined in the transitive JAR httpclient 4.5.2, and those required methods don't
exist in the loaded version httpclient:4.5.1.
> The dependency conflict problem brings high risks of "*NotClassDefFoundError:*" or "*NoSuchMethodError*"
issues at runtime. Please notice this problem. *The solution is upgrading httpclient from
4.5.1 to 4.5.2.*
>  
> ===============projectPath->org.apache.ignite:ignite-aws:2.5.0-SNAPSHOT@D:\ws\snapshot\ignite-master\modules\aws\pom.xml
>  =======conflict:<org.apache.httpcomponents:httpclient:4.5.2::compile><org.apache.httpcomponents:httpclient:4.5.1::compile>
size:2
>  org.apache.ignite:ignite-aws:2.5.0-SNAPSHOT::null->com.amazonaws:aws-java-sdk-core:1.11.75::compile->org.apache.httpcomponents:httpclient:4.5.2::compile
>  org.apache.ignite:ignite-aws:2.5.0-SNAPSHOT::null->org.apache.httpcomponents:httpclient:4.5.1::compile
> *====Risk for ClassNotFoundException/NotClassDefFoundError:*
>  a) Classes that only exist in org.apache.httpcomponents:httpclient:4.5.1:
>  org.apache.http.client.utils.DateUtils$DateFormatHolder$1
> b) Classes that only exist in org.apache.httpcomponents:httpclient:4.5.2:
>  org.apache.http.conn.ssl.DefaultHostnameVerifier$TYPE
>  org.apache.http.impl.client.DefaultClientConnectionReuseStrategy
>  org.apache.http.conn.ssl.DefaultHostnameVerifier$1
> *====Risk for NoSuchMethodException/NoSuchMethodError:*
>  Methods that only exist in org.apache.httpcomponents:httpclient:4.5.2:
>  <org.apache.http.impl.cookie.PublicSuffixDomainFilter: java.util.Map createLocalDomainMap()>
>  <org.apache.http.impl.cookie.IgnoreSpec: boolean match(org.apache.http.cookie.Cookie,org.apache.http.cookie.CookieOrigin)>
>  <org.apache.http.impl.client.HttpClientBuilder: org.apache.http.impl.client.HttpClientBuilder
setDnsResolver(org.apache.http.conn.DnsResolver)>
>  



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