Get the Eclipse plug-in for Maven.
Read up on Maven.
It is a very nice way to run a project in Eclipse.
It can not do anything that Ant can not do but it does a lot of what Ant
can do without you having to write anything.
It is a different way to approach things but is very nice once you get
it set up.
The Maven documentation is abysmal. It is sparse, written from a totally
useless point of view and you have to read between the lines to make any
sense of it. If they had decent docs, it would be universally used for
any project with more than 2 developers.
On the bright side, once you have a POM file set up or given to you, you
usually do not have much contact with Maven until you start to add new
dependencies to your project and they go in pretty well.
The worst thing about Maven and Eclipse is that Eclipse has to be told
about your dependencies manually in order to do syntax highlighting. You
need to add each of the dependencies in your Maven POM to your build
path. If not, your code will be lit up like a Xmas tree and still compile.
Not a big deal but the Plug-in should deal with this. (Maybe it does and
I have not found the right place to poke it - Eclipse is a great IDE but
takes a long time to get good at it.)
Ron
[EMAIL PROTECTED] wrote:
Thanks. So as to not waste any more of your time, sounds like I should drop
this tutorial and shift to the maven tutorial, as per David Taylor.
Hopefully I can use the maven tutorial code as Eclipse projects with some
tweaking?
Ben
---- Andrew Strickland <[EMAIL PROTECTED]> wrote:
or rather, I guess that "null" corresponds to the groupId in the POM of the
express-demo project. Check to see if that has a value.
On Mon, Apr 14, 2008 at 8:26 PM, Andrew Strickland <[EMAIL PROTECTED]>
wrote:
without looking at the code, the problem to me seems to be the:
*
Caused by: org.apache.maven.project*
*.ProjectBuildingException: Cannot find parent
: org.apache.portals.tutorials**:portal-applications for project:
null:express-dem
o:war:null for project null:express-demo:war:null
*
Whatever the value of the express-demo pom artifactId is, it's not
supposed to be "null". Just a guess though,
Andy
On Mon, Apr 14, 2008 at 6:58 PM, <[EMAIL PROTECTED]> wrote:
Hi. I'm trying to figure out why I'm getting this maven error, at this
point in the tutorial:
http://portals.apache.org/tutorials/jetspeed-2-ant/03/build-it.html
Below are details of the error:
----------------------------------------------------------------
Directory of
C:\downloads\Apache\JetspeedTraining\workspace\jetexpress\applicat
ions\express-demo
04/14/2008 06:11 PM <DIR> .
04/14/2008 06:11 PM <DIR> ..
04/14/2008 06:11 PM 7,816 pom.xml
04/14/2008 06:11 PM <DIR> src
1 File(s) 7,816 bytes
3 Dir(s) 169,487,032,320 bytes free
C:\downloads\Apache\JetspeedTraining\workspace\jetexpress\applications\express-d
emo>mvn
[INFO] Scanning for projects...
Downloading:
http://repo1.maven.org/maven2/org/apache/portals/tutorials/portal-a
pplications/1.0/portal-applications-1.0.pom<http://repo1.maven.org/maven2/org/apache/portals/tutorials/portal-applications/1.0/portal-applications-1.0.pom>
[INFO]
------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO]
------------------------------------------------------------------------
[INFO] Failed to resolve artifact.
GroupId: org.apache.portals.tutorials
ArtifactId: portal-applications
Version: 1.0
Reason: Unable to download the artifact from any repository
org.apache.portals.tutorials:portal-applications:pom:1.0
from the specified remote repositories:
central (http://repo1.maven.org/maven2)
[INFO]
------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.reactor.MavenExecutionException: Cannot find parent:
org.apache
.portals.tutorials:portal-applications for project:
null:express-demo:war:null f
or project null:express-demo:war:null
at
org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:378)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:292)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at
org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.project.ProjectBuildingException: Cannot
find parent
: org.apache.portals.tutorials:portal-applications for project:
null:express-dem
o:war:null for project null:express-demo:war:null
at
org.apache.maven.project.DefaultMavenProjectBuilder.assembleLineage(D
efaultMavenProjectBuilder.java:1370)
at
org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(Def
aultMavenProjectBuilder.java:821)
at
org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFi
leInternal(DefaultMavenProjectBuilder.java:506)
at
org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMave
nProjectBuilder.java:198)
at
org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:583)
at
org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:461)
at
org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:365)
... 11 more
Caused by: org.apache.maven.project.ProjectBuildingException: POM
'org.apache.po
rtals.tutorials:portal-applications' not found in repository: Unable to
download
the artifact from any repository
org.apache.portals.tutorials:portal-applications:pom:1.0
from the specified remote repositories:
central (http://repo1.maven.org/maven2)
for project org.apache.portals.tutorials:portal-applications
at
org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepo
sitory(DefaultMavenProjectBuilder.java:603)
at
org.apache.maven.project.DefaultMavenProjectBuilder.assembleLineage(D
efaultMavenProjectBuilder.java:1366)
... 17 more
Caused by: org.apache.maven.artifact.resolver.ArtifactNotFoundException:
Unable
to download the artifact from any repository
org.apache.portals.tutorials:portal-applications:pom:1.0
from the specified remote repositories:
central (http://repo1.maven.org/maven2)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(De
faultArtifactResolver.java:212)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(De
faultArtifactResolver.java:74)
at
org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepo
sitory(DefaultMavenProjectBuilder.java:556)
... 18 more
Caused by: org.apache.maven.wagon.ResourceDoesNotExistException: Unable
to downl
oad the artifact from any repository
at
org.apache.maven.artifact.manager.DefaultWagonManager.getArtifact(Def
aultWagonManager.java:331)
at
org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(De
faultArtifactResolver.java:200)
... 20 more
[INFO]
------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Mon Apr 14 18:17:33 EDT 2008
[INFO] Final Memory: 1M/2M
[INFO]
------------------------------------------------------------------------
C:\downloads\Apache\JetspeedTraining\workspace\jetexpress\applications\express-d
emo>
---------------------------------------------------------------------------
As a side-issue, I've managed to work around many of the obvious errors
in the tutorial and gotten pretty far with the changes and "delta" deploys,
but it contains so many bugs and incorrect file locations and such, that
it's almost useless as a "tutorial" for newcomers...hard to see the forest
for all the trees. Of course, those who already have good experience with
jetspeed and/or portlets AND tomcat AND maven AND eclipse AND ant, will
probably be able to figure it out....but that's more background knowledge
than most newcomers will probably have...or are willing to learn for no
other reason than to learn portlets.
The tutorial looks like it was quite good at one time, so it gives me
the feeling that this jetspeed (and maybe portlets in general) isn't being
actively advanced anymore. Is that so?
Ben
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