Want to shift to maven for my old java web project. So created a basic pom.xml using IntelliJ Idea facility. The project is a J2EE web project and also uses axis 2 1.7.7 . All the jars are in 'lib' directory inside the project structure. Is there a easy way to find out the dependency entries which will be required in the newly created 'pom.xml' . What I mean is a a tool which can pickup the jars one by one and suggest the dependency entries
Any help will be highly appreciated here.Thanks
I don't think there is such a tool.
Note that you probably only need to add some of the dependencies because Maven resolves transitive dependencies automatically.
So I would look into the source code, figure out which classes you import and add the appropriate dependencies.
Related
We have a EAR project which has a WAR project. Maven is used, so pom.xml. As typical of any project, this project also contains a big feature (say Job Scheduling "JBS") among many other features. As it is planned to retire this whole project in the near future, it is discouraged heavily to spend much on working on this project (whether bugs or enhancements).
Therefore, for the sake of running the (JBS) feature as a separate application, the whole EAR project was duplicated (also to save time/cost). As a result, all the Java packages and classes (necessary for JBS project) were duplicated. In this situation, if we update one or more classes in the main project, this (JBS) feature project/application gets outdated (and needs update).
The fact is that this JBS feature project ONLY requires many packages of Java classes (from the main EAR-WAR project), and do not require 99% of the web modules and others. I am removing all the unnecessary things from JBS project. Then I would like to create a JAR library with all the java classes, so JBS project can have a dependency on this JAR.
I do not know if it is a good idea to separate these classes out of the main project (to create another Java project). I would like to continue to have these classes as part of the main project. Then, it will be good, as and when one or more of these classes are changed, a new version of the JAR will be generated (right away). And the JBS project would then make use of this updated JAR.
How can we accomplish this? I understand, through maven, we can do a build/package jar/war/ear on a project of that nature. I am not an expert with maven (and did not learn it systematically).
But, is there a way to create one or more JARs additionally from inside WAR pom.xml? In other words: I mean pom.xml of WAR will create a WAR. In addition to creating a WAR, can maven help create additional JAR? Or can maven create two packages out of one pom.xml?
Or should I create a separate module in the main project with all these packages/classes, and have its own pom.xml to generate the necessary JAR? For this, most probably I need to modify the structure of the main project. I would like to avoid this unless there is no way out.
Can you advice?
It seems like the best thing for you would be to create a multi-module project that both contains the JAR and the other project. This way, you can easily change/build them together, but you create separate artifacts.
For my project, I'm using code from another project found on github. I've included the project as a separate folder in my project. My project uses code from that project, so I want to build that project and include it in my project without really making any changes to that project. So how do I specify in my pom.xml to run the sub-projects pom.xml?
If it helps, here is the repository of the other project that I am using: Soda Java
If you're not planning on changing it, simply download it & build it once using Maven. This will install it into your local repository, and you can simply reference it in your pom without any issue.
If you can find it in an external maven repo somewhere, you wouldn't even have to download & build it.
Only if you're planning on changing it do you need the aggregate project approach.
You create an aggregate project with packaging=pom and a modules element that has one module for the dependency and one module for your project, and you build that.
just a simple question: I need to add a Maven dependency to a Eclipse Plugin project.
The project has not a POM file, so I converted it to a Maven one.
Now I have plugin.xml file and pom.xml file. POM contains the dependency I need to satisfy, but it's ignored; I mean, I can't resolve an import in source code referring to that import.
Can you help me?
ty
I read about Tycho plugin, but online configurations don't work.
If I'm reading this correctly, you've just started by adding a Maven dependency to your project, but don't have the dependency available for Eclipse to validate your code against.
You will need to start a Maven build after you add a brand new dependency so that Maven can add that to your local cached repository. Once the Maven build is done, Eclipse should recognize your imports properly.
You may want to check whether the dependency you are looking for is available in the Eclipse Orbit.
The Orbit project is basically a repository of libraries to make them available for Eclipse Plug-in Development. What is especially nice in the Orbit libraries is that they also provide the sources. Thus, it is possible to view the implementation and get proper JavaDoc and so on.
Example
One can find the com.google.gson library using the update site
https://download.eclipse.org/tools/orbit/downloads/drops/R20190602212107/repository
Thereby, the part R20190602212107 refers to the Orbit build name that you find on the downloads page of the project.
I have a project that consists of several modules (app. 10-12). I use maven idea plugin to generate .iml for each module, but I have one problem. All modules are of JAVA_MODULE type, but plugin generates main module as J2EE_WEB_MODULE. I think it is because there's .war files and WEB_INF folders in target folder, but these ones are for Tomcat usage. Anyway, at the end I must edit .iml file and change J2EE_WEB_MODULE to JAVA_MODULE.
Is there any way to make maven plugin generate a module of specific type? Or maybe there's a workaround that lets one change with maven, using regexp, module type in .iml?
Thank you in advance.
Do not use the maven-idea-plugin, it is obsolete and has not been updated since 2008.
Just open the project by pointing to the pom.xml.
The guys at JetBrains has done a perfect job with their own maven integration.
I have two maven projects, the second project extends some classes of first project. I want to create the jar file with all dependencies of first project and include it to another project as dependency. I am searching this since long time, is it possible to do it?
I am new to maven, any help on this would be highly appreciated.
Thanks
If you just want to add the dependencies to another project you add the second project dependency to your new project and the first one will be inherited and automatically included. This is what is called a transitive dependency. Read more about it in the free book Maven: The Complete Reference.
If I understand you right, you want to create a uber-jar containing all dependencies, right ?
Please refer to this question How can I create an executable JAR with dependencies using Maven?
In the second project's POM file, specify the first projects maven co-ordinates (groupId,artifactId,version,packaging) under the 'dependency' section. It will transitively acquire all the dependent artifacts.
Although it is possible in Maven to generate a standalone jar with all its dependencies. For that purpose, you can use the maven-shade-plugin. ( Reference )
There are two ways you are create a fat jar. You include the jar itself in the jar of dependent. You will not have much control in this case and the maven assembly plugin would do the work. Alternatively, you can unzip the jar and zip everything together to create the new jar. You have to decide which one best suits you. If you have multiple versions of same class, then include the whole jar in the new jar would help, but if the versions are coherent, it's best to create a jar by unzipping and zipping everything. For the second procedure, I recommend using the maven shade plugin to create uber jar.