We have been trying to migrate our multi-module projects to maven. I have been struggling with the maven install plugin bug "http://jira.codehaus.org/browse/MNG-2971". I have written a Java program which can find and replace the expressions using my settings.xml and POM in my local repository view.
As a result all of my parent POM's are having a additional phase in the build process. What i'm doing is that i have attached a goal which will run my Java program during "validate" phase.
I think this is a not a good idea instead i would have asked individuals to run the program on their local repository on their own.
What i'm asking here is that the best way to work around the "install" plugin issue (MNG-2971).
I searched through the net but i could not locate such work around.
Well, I didn't try it because I'm not using properties from the settings.xml but the issue has a work around in the comments.
Related
In general, how well does m2eclipse deal with Maven plugins that modify or amend lifecycle phases?
In particular, I have a project that has a maven-clean-plugin extension to remove an extra generated directory (not in target/) using the configuration filesets tag. This works when running mvn at the command line but not when doing a clean in Eclipse. Is there any way to get m2eclipse to process that plugin?
Another example is flexmojos; there's a lot that can be configured with the flexmojo plugin but those parameters don't seem to get imported by m2eclipse.
Is the integration solely ad-hoc? If m2eclipse embeds Maven, why can't the plugins be executed directly using the underlying pom.xml configuration?
In general, how well does m2eclipse deal with Maven plugins that modify or amend lifecycle phases?
Decently, to my experience. At least for plugin bound to phases from the default lifecycle.
In particular, I have a project that has a maven-clean-plugin extension (...). This works when running mvn at the command line but not when doing a clean in Eclipse. Is there any way to get m2eclipse to process that plugin?
What the clean plugin "extension" is doing and what you're doing (calling mvn clean from Eclipse? calling Project > Clean?) is unclear - at least for me. But maybe have a look at MNGECLIPSE-823 or MNGECLIPSE-156. And don't hesitate to clarify :)
Another example is flexmojos; there's a lot that can be configured with the flexmojo plugin but those parameters don't seem to get imported by m2eclipse.
I don't do flex so the above is too vague for me. But providing a more concrete example might help.
I recently started to use Maven2 in one of my Java web application projects. Now I had many issues with it, some times project fails to build for no apparent reason and then it suddenly starts to work when nothing was done at all to project. Or some times our project members must delete project from their harddrive and download project again from SVN. There seems to be many very odd bugs in Maven in eclipse, but there some issues I would like know if it is possible to solve this issues.
1) I have understood that Maven2 should be able to get dependencies for added jars, but when I add a new dependency in Eclipse, it fails when I build it, it says dependecies are missing. How can I make maven to download those missing dependecies automatically?
2) I have Tuckey UrlRewrite Filter in use, but public repositories have only old version of this dependecy, so when I use this old version (3.1 when I need 3.2). How can I include this to project? We have many programmers in this project, so setting up local repository would mean that all our programmers would have to install that local repository.
Now I had many issues with it, some times project fails to build for no apparent reason and then it suddenly starts to work when nothing was done at all to project. (...)
Ok and what is the point of this free rant? I use Maven and my builds are 100% reproducible, there are well known practices to follow to achieve this. Maybe you're just not following them. Anyway if you're not happy with it, what can I say, don't use it.
I have understood that Maven2 should be able to get dependencies for added jars, but when I add a new dependency in Eclipse, it fails when I build it, it says dependencies are missing. How can I make maven to download those missing dependencies automatically?
I think you misunderstood, Eclipse won't guess what Maven coordinates to add if you don't provide the required informations for them. Dependencies must be declared in the POM, either by editing the POM manually or by using m2eclipse wizards.
And if this is what you did (and if I misunderstood the question) then please provide the <dependency> declaration and the exact error trace.
I have Tuckey UrlRewrite Filter in use, but public repositories have only old version of this dependecy, so when I use this old version (3.1 when I need 3.2). How can I include this to project? We have many programmers in this project, so setting up local repository would mean that all our programmers would have to install that local repository.
This question has already been asked several times, see for example Maven, how to add additional libs not available in repo where I suggest two possible solutions (use a corporate repository like Nexus or a "file-based" repository, the former suggestion being the preferred one for a long term solution).
I want to start using maven in code I distribute but I can't find an efficient way to work with dependencies. Every new dependency takes me far too long to add.
As a simple example, I need to add Tomcat for compilation. Do I really have to manually trawl the repo in my browser to find the group-id, artifact-id and version number?
In every case it seems easier to find the non-maven downloads. I hope I've missed something obvious.
Do I really have to manually trawl the repo in my browser to find the group-id, artifact-id and version number?
No. Use a repository search engine. Some are mentioned here, more here. Some IDE also offer facilities to search and add dependencies (e.g. Eclipse with m2eclipse).
First of all, using some IDE really helps. Eclipse has m2eclipse plugin and if you define locations of remote maven repositories in your pom definition, you can add dependencies in its pom editor and it will automatically search the proper artifacts for you.
What is really helpful is using repository manager like Nexus / Artifactory, where you gather the most important maven repositories and then you don't need to declare particular repository locations in your pom definition for various artifacts, but everything will be proxied via Nexus.
I am installing to Maven repository our internal files using mvn install:install command. All Jars installed in such way have version name added automatically as a suffix. Since we have many batch scripts with the Jars names it is very inconvenient for us. How this auto-renaming can be switched off?
You can't. Dependency resolution in Maven works because Maven has conventions and the naming of artifacts is one of them. So you can't turn off the way maven install artifacts (and you actually don't want to).
The common way to handle scripts (bat/sh) is to put them in your source tree (e.g. in src/main/bin) and to create a distribution of your project with the assembly plugin. When building your assembly, you can rename artifacts, filter distribution files, etc. That would be the right place to do such kind of things.
it's tempting to want to remove the version number, but I'd recommend keeping it on if at all possible.
Instead of removing the version numbers, maybe you could use Maven's resource filtering capability to manage your batch scripts? Maven can manage your batch scripts by replacing placeholders such as ${project.version} inside the bat script with the current version number from the pom.xml. That way you can ensure that the batch script is running the correct (expected) version of the code.
You could probably force maven to deploy a jar without a version, but if you do so, you lose some of the main benefits of having Maven manage your build in the first place, imo. For example, just yesterday I was asked to maintain a java project not managed by maven with a bunch of non-versioned jar files inside a lib directory. There's no way to know where any of the jars came from.
It might be a little bit of a headache up front, but if you're using maven, you might as well jump in 100% (again, from my experience).
The past week or two I've been studying Maven, and I like it, but there are just a few things that I require Ant tasks for, rather than Maven's complicated and scarcely-documented POM file. However, I believe Maven has a great folder structure going for it, and I like that it natively supports tests, packages the project into a jar by default, and supports a 'resources' folder, from which everything is directly copied into the jar file.
Is there a sample Ant project out there that does the same sort of thing but with an Ant build.xml script? I want the placeholder folders and hello world app and test, just like Maven does when you first create a project from its default archetype:create goal (as demonstrated in the Maven in 5 Minutes page). Or, is there an even better Ant sample project out there that does more or suggests a better folder layout?
If no such thing exists, perhaps someone can help create it in a nice detailed answer? I would be willing to host a permanently-available zip file for anyone who finds this question in the future.
mvn archetype:create
mvn ant:ant
http://maven.apache.org/plugins/maven-ant-plugin/usage.html
... but if there are really "just a few things", you may want to check out the AntRun plugin instead. I'm not trying to sell you on Maven, believe me, but since it's not clear exactly what is stopping you from trying it with your project, I guess I'm suggesting you try to push the issue a little harder.
Refer this: Why you should use the Maven Ant Tasks instead of Maven or Ivy
I also wouldn't recommend Ivy, reasons at the link above.
Quoting the Maven - Frequently Asked Technical Questions and more precisely:
How can I use Maven features in an Ant build?
The Maven Ant Tasks allow many of the
features of Maven, such as dependency
management and repository deployment,
to be used in an Ant build.
Refer to the installation page and the usage page for instructions for installing and using the Maven Ant Tasks respectively. You'll find many links to samples in the usage page and a build.xml showing most of the features in action.
An alternative (direct competitor?) to Maven Ant Tasks would be Apache Ivy.
PS: While it's definitely a good idea to adopt maven standards, even partially, I'd really think about it twice before to drop Maven (but I live in the Maven jungle for a while now - and I like it - so I'm biased).