[
http://jira.codehaus.org/browse/MASSEMBLY-420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=236764#action_236764
]
John Casey edited comment on MASSEMBLY-420 at 9/28/10 2:41 PM:
---------------------------------------------------------------
Creating empty archives was never part of the design of the assembly plugin; it
was a bug in the plexus-archiver at one point.
If the assembly contains no files, by design it should fail to alert the user
that something has gone wrong. It's not considered sane to create a
distribution archive that contains nothing.
For a more detailed discussion about building an assembly at the parent level,
see:
http://maven.apache.org/plugins/maven-assembly-plugin/faq.html#module-binaries
and:
http://maven.apache.org/plugins/maven-assembly-plugin/examples/multimodule/module-binary-inclusion-simple.html
NOTE: Those pages are both in dire need of updating. I've made the changes, but
will wait to push the new site until the release of this plugin.
So, until that release, those pages will give BAD ADVICE on this topic.
Here is the gist:
{quote}
If your assembly includes module binaries, those binaries won't be available to
the assembly plugin except in special cases. This is normally seen when the
Assembly Plugin is bound to a phase of the standard build lifecycle in the
parent POM of a multimodule build. It is a result of the way Maven sorts and
executes the build process for a multimodule project layout.
In a multimodule hierarchy, when a child module declares the parent POM in its
<parent/> section, Maven interprets this to mean that the parent project's
build must be completed before the child build can start. This ensures that the
parent project is in its final form by the time the child needs access to its
POM information. In cases where the Assembly Plugin is included as part of that
parent project's build process, it will execute along with everything else as
part of the parent build - before the child build can start. If the assembly
descriptor used in that parent build references module binaries, it effectively
expects the child build to be completed before the assembly is processed. This
leads to a recursive dependency situation, where the child build depends on the
parent build to complete before it can start, while the parent build depends on
the presence of child-module artifacts to complete successfully. Since these
artifacts are missing, the Assembly Plugin will complain about missing
artifacts, and the build will fail.
In many cases, you can avoid this problem by adding a new child module whose
sole purpose is to produce your assembly. In the POM for this new project, add
dependency definitions for any of the module binaries you had previously
referenced. This will ensure the new assembly child is built last. Then, move
your assembly descriptor into this new child module. At this point, you have
the option of either changing all moduleSet/binaries references to
dependencySet references, or you can keep the moduleSets and instead set the
useAllReactorProjects flag to true for each moduleSet.
Obviously, any fileSet or file references you may have in this descriptor may
need to be adjusted or have the files they reference moved into the new child
module alongside the descriptor itself.
In cases where you absolutely must use module-binaries references, you should
create an assembly-child POM mentioned above, then insert
<useAllReactorProjects>true<useAllReactorProjects> to each of your moduleSet
sections. Then, bind the assembly in your assembly-child POM (normally to the
package phase) using the single goal. When you execute the build from the
top-level POM, Maven should generated your assembly in the new child project.
NOTE: The useAllReactorProjects flag is only available in version 2.2-beta-6
and higher.
{quote}
was (Author: jdcasey):
Creating empty archives was never part of the design of the assembly
plugin; it was a bug in the plexus-archiver at one point.
If the assembly contains no files, by design it should fail to alert the user
that something has gone wrong. It's not considered sane to create a
distribution archive that contains nothing.
For a more detailed discussion about building an assembly at the parent level,
see:
http://maven.apache.org/plugins/maven-assembly-plugin/faq.html#module-binaries
and:
http://maven.apache.org/plugins/maven-assembly-plugin/examples/multimodule/module-binary-inclusion-simple.html
NOTE: Those pages are both in dire need of updating. I've made the changes, but
will wait to push the new site until the release of this plugin.
So, until that release, those pages will give BAD ADVICE on this topic.
Here is the gist:
{noformat}
If your assembly includes module binaries, those binaries won't be available to
the assembly plugin except in special cases. This is normally seen when the
Assembly Plugin is bound to a phase of the standard build lifecycle in the
parent POM of a multimodule build. It is a result of the way Maven sorts and
executes the build process for a multimodule project layout.
In a multimodule hierarchy, when a child module declares the parent POM in its
<parent/> section, Maven interprets this to mean that the parent project's
build must be completed before the child build can start. This ensures that the
parent project is in its final form by the time the child needs access to its
POM information. In cases where the Assembly Plugin is included as part of that
parent project's build process, it will execute along with everything else as
part of the parent build - before the child build can start. If the assembly
descriptor used in that parent build references module binaries, it effectively
expects the child build to be completed before the assembly is processed. This
leads to a recursive dependency situation, where the child build depends on the
parent build to complete before it can start, while the parent build depends on
the presence of child-module artifacts to complete successfully. Since these
artifacts are missing, the Assembly Plugin will complain about missing
artifacts, and the build will fail.
In many cases, you can avoid this problem by adding a new child module whose
sole purpose is to produce your assembly. In the POM for this new project, add
dependency definitions for any of the module binaries you had previously
referenced. This will ensure the new assembly child is built last. Then, move
your assembly descriptor into this new child module. At this point, you have
the option of either changing all moduleSet/binaries references to
dependencySet references, or you can keep the moduleSets and instead set the
useAllReactorProjects flag to true for each moduleSet.
Obviously, any fileSet or file references you may have in this descriptor may
need to be adjusted or have the files they reference moved into the new child
module alongside the descriptor itself.
In cases where you absolutely must use module-binaries references, you should
create an assembly-child POM mentioned above, then insert
<useAllReactorProjects>true<useAllReactorProjects> to each of your moduleSet
sections. Then, bind the assembly in your assembly-child POM (normally to the
package phase) using the single goal. When you execute the build from the
top-level POM, Maven should generated your assembly in the new child project.
NOTE: The useAllReactorProjects flag is only available in version 2.2-beta-6
and higher.
{noformat}
> maven fails when packing parent pom
> -----------------------------------
>
> Key: MASSEMBLY-420
> URL: http://jira.codehaus.org/browse/MASSEMBLY-420
> Project: Maven 2.x Assembly Plugin
> Issue Type: Bug
> Affects Versions: 2.2-beta-3
> Environment: Windows Vista
> Reporter: Karsten Ohme
> Assignee: John Casey
> Priority: Blocker
> Fix For: 2.2-beta-6
>
>
> I have a parent module and multiple sub modules. I must build all submodules
> manually, because the parent assembly cannot be created.
> I have defined the assembly plugin in the parent.
> [INFO] [assembly:single {execution: make-assembly}]
> [WARNING] Cannot include project artifact: org.foo.bar:j2se:pom:1
> .0.2-SNAPSHOT; it doesn't have an associated file or directory.
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Failed to create assembly: Error creating assembly archive
> jar-with-dependencies: You must set at least one file.
> In previous releases it was working.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://jira.codehaus.org/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
