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Confusing transitive dependency behavior with xml-apis

Tags:

java

maven

dependency-management

In my project I depend on several external libraries that depend on various versions of xml-apis. If I use maven-enforcer-plugin to fail if there are version conflicts my build fails.

Before I started, printing the classpath of my running app gives xml-apis:xml-apis:1.4.01

When I enable maven-enforcer-plugin I get this, which is expected

Dependency convergence error for xml-apis:xml-apis:1.3.04 paths to dependency are:

+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.bbraile:utd:1.0-SNAPSHOT
    +-xalan:xalan:2.7.2
      +-xalan:serializer:2.7.2
        +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.bbraile:utd:1.0-SNAPSHOT
    +-xml-apis:xml-apis:1.4.01
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.bbraile:utd:1.0-SNAPSHOT
    +-xerces:xercesImpl:2.11.0
      +-xml-apis:xml-apis:1.4.01
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-com.io7m.xom:xom:1.2.10
    +-xml-apis:xml-apis:1.3.03
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-bridge:1.7
      +-org.apache.xmlgraphics:batik-anim:1.7
        +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-bridge:1.7
      +-org.apache.xmlgraphics:batik-css:1.7
        +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-bridge:1.7
      +-org.apache.xmlgraphics:batik-ext:1.7
        +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-bridge:1.7
      +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-dom:1.7
      +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-gvt:1.7
      +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-svg-dom:1.7
      +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-org.apache.xmlgraphics:batik-svggen:1.7
      +-xml-apis:xml-apis:1.3.04
and
+-org.bbraile:bbraile:1.0-SNAPSHOT
  +-org.apache.xmlgraphics:batik-transcoder:1.7
    +-xml-apis:xml-apis:1.3.04

To fix this based on what I've read I should add this to my POM

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>xml-apis</groupId>
            <artifactId>xml-apis</artifactId>
            <version>2.0.2</version>
        </dependency>
    </dependencies>
</dependencyManagement>

And re-run my program again. It passes maven-enforcer-plugin checks but my classpath says now I'm running xml-apis:xml-apis:1.0.b2. How did the version number get older? Why is my version getting ignored?

Adding this to my POM, with or without the <version> tag has no effect

<dependencies>
    <dependency>
        <groupId>xml-apis</groupId>
        <artifactId>xml-apis</artifactId>
        <version>2.0.2</version>
    </dependency>
</dependencies>

Consulting dependency:tree -Dverbose=true -Dincludes=xml-apis gives below, which implies 2.0.2

org.bbraile:bbraile:jar:1.0-SNAPSHOT
+- org.bbraile:utd:jar:1.0-SNAPSHOT:compile
|  +- xalan:xalan:jar:2.7.2:compile
|  |  \- xalan:serializer:jar:2.7.2:compile
|  |     \- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for conflict with 1.0.b2)
|  \- xerces:xercesImpl:jar:2.11.0:compile
|     \- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
+- com.io7m.xom:xom:jar:1.2.10:compile
|  \- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
+- org.apache.xmlgraphics:batik-transcoder:jar:1.7:compile
|  +- org.apache.xmlgraphics:batik-bridge:jar:1.7:compile
|  |  +- org.apache.xmlgraphics:batik-anim:jar:1.7:compile
|  |  |  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  |  |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|  |  +- org.apache.xmlgraphics:batik-css:jar:1.7:compile
|  |  |  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  |  |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|  |  +- org.apache.xmlgraphics:batik-ext:jar:1.7:compile
|  |  |  \- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  |  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|  +- org.apache.xmlgraphics:batik-dom:jar:1.7:compile
|  |  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|  +- org.apache.xmlgraphics:batik-gvt:jar:1.7:compile
|  |  \- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  +- org.apache.xmlgraphics:batik-svg-dom:jar:1.7:compile
|  |  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|  +- org.apache.xmlgraphics:batik-svggen:jar:1.7:compile
|  |  \- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  +- (xml-apis:xml-apis:jar:2.0.2:compile - version managed from 1.0.b2; omitted for duplicate)
|  \- xml-apis:xml-apis-ext:jar:1.3.04:compile
\- xml-apis:xml-apis:jar:2.0.2:compile

Why is my explicit version in dependencyManagment being ignored? Why did setting that reduce the version on my classpath? How can I pass maven-enforcer-plugin with the most recent xml-apis version?

like image 944
TheLQ Avatar asked Mar 30 '15 19:03

TheLQ

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Video Answer

1 Answers

Turns out this isn't a maven problem, this is a xml-api's problem. As of today this is how xml-apis:xml-apis looks in Maven Central

Very confusing xml-apis versions

If you look carefully 2.0.2 isn't the latest release, 1.4.01 is! While everybody else and their IDEs considers 2 to be greater than 1, xml-apis goes backwards.

This is extremely confusing and non-obvious, so hopefully someone finds this useful.

like image 148
TheLQ Avatar answered Oct 29 '22 21:10

TheLQ
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