Sometimes I just want to see a small piece of code in a maven project. Every time I open a maven project, I need to download the jar defined in pom.xml. I can't see the source code without downloading it. What should I do?
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Can some one please help me in below:
I am using RTC and checkout Gradle project, but at the end when I am checking the properties and looking for source folder for my build, I am getting nothing.
Also I am not send the repository specific Gradle jars. What i am doing wrong?
I tried including external jars but no luck as their are too many jars.
Error: project is not at all building.
right click on your project then configure and convert it to gradle project.
Refresh and you will see all dependencies.
I know I should be working with my build.gradle and init.gradle files but I don't know what to write or how to point to my project folder with the pom.xml file.
The first step is to run gradle init in the directory containing the (master) POM. This will convert the Maven build to a Gradle build, generating a settings.gradle file and one or more build.gradle files. For simpler Maven builds, this is all you need to do. For more complex Maven builds, it may be necessary to manually add functionality on the Gradle side that couldn't be converted automatically.
https://guides.gradle.org/migrating-from-maven/
as Peter Niederwieser said:
For more complex Maven builds, it may be necessary to manually add
functionality on the Gradle side that couldn't be converted
automatically.
although you have to write some parts manually by your self. there is an online service that may be an useful tool For complex Maven builds. maven2gradle is a project on github which can convert online dependencies element automatically from maven to gradle scripts.
for using it,
get to maven2gradle . URL
open and select contains of your maven file.
Paste your maven dependencies on the text box in that web page (with
or without the dependencies root element).
click Convert button.
for more information http://sagioto.github.io/maven2gradle/
I want to use https://code.google.com/p/droidpersistence/source/checkout but I don't know how add to my pom.xml..
The link you provided specifies a place you can download some code, using Subversion:
svn checkout http://droidpersistence.googlecode.com/svn/trunk/ droidpersistence-read-only
So run that command, and it will download the code. That particular code is designed to be built with ant, instead of maven. You need to write a little pom.xml file for it, so that when you build it on your computer with "mvn clean install", maven will generate a .jar file (the artifact), and put it in your local maven repository (.m2 directory). Then add a dependency on that jar to your pom file.
In general, to add a dependency to your pom using the latest version of IntelliJ Idea (12.1.6), click somewhere in your pom file, and press ALT-INSERT, then choose "dependency".
Hope this helps!
so I have started using maven (with eclipse, and a local implementation of Sonatype) not that long ago, after getting through the initial pain I though everything was working.... apparently not !
I have my main project POM and all my child POM (I am using a 'flat' hierarchy, so all the sub projects are in the same folder as the parent POM). This seems to be working OK.
The sub project where all started and 'released' and tested before I started using Maven. I went to maven to solve my 'dependencies' problems... or rather make them more complicated in this instance.
Most of the 'Maven' stuff seems to work fine, but I can't resolve the dependencies of my 'sub projects' that have been released into my local ms/repository
Each day I start up eclipse and have the same problems, I have 'unable to resolve imports' on all my personal libraries, and all those that I use for them (such as Log4j, DDlUtils etc).
I thought the whole point of maven was that I would be able to put in an import declaration for a library, add the 'groupID' and other stuff to the child POM (or parent POM). And then have all the jars downloaded automagically when I run
mvn install
against the parent.
However each day I find I have to re-insert the build path to the libraries (internal and external) via the eclipse workspace and point them to the location of the libraries that I have downloaded as maven can't seem to find them anywhere.
Specifically with running Junit test, I can run them from the workspace (using run as junit) and they all pass fine. But if I try to run them with
mvn test
I get an message saying
java.lang;NoClassDefFoundError: org/junit/Assert
(and this is the same from within eclipse running the mvn test or from CLI)
with an error message in the output of
failed to execute goal org.apache.maven.plugins:maven.surfire-plugin:2.10:test
the POM and jar are in my M2_REPO, and I can find it when I search in sonatype, why can't maven find something that is part of its own system, exists in its repo.
but this obviously works just fine when I run via eclipse and point it to an independently downloaded junit library.
I don't know what extra info you may require, and I'm obviously missing something in either the m2e plugin, my maven install or in sonatype.
please help I'm begining to loose my hair!
and may soon be forced to return to an ant/ivy solution (but don't want to have to learn 'yet another tool' (in this case ivy).
Thanks in advance
David.
ps. i'm on a windows XP platform
edit...
can I get maven to build and release the jar and pom even though it thinks it is failing the tests (which is itn't as I'm doing them manually, and they pass just fine).
If I look in the 'effective POM' tab of my parent POM, the plugin stated above is not in there. I guess this means it is a maven config setting, but where do I add it, and why isn't it automatic when I run my first set of maven tests?
edit 2....
I just found this on the apache plugin comments page (http://maven.apache.org/plugins/maven-surefire-plugin/plugin-info.html), so I ran the code on the CLI, mvn surefire:help -Ddetail=true -Dgoal=test lots of stuff was downloaded, and now the tests run, but they fail within maven ? (remember they pass when run from eclipse using 'run as junit test)... so this is nearly a solution...
It sounds like you need make eclipse aware that the projects in question are Maven projects. You may have POMs set up for your projects, but for the m2e plugin to work you need to have either created the project as a Maven project ('New' -> 'Project...' -> 'Maven' -> 'Maven Project...'), or converted it into a Maven project by right clicking it then selecting 'Configure' -> 'Convert to Maven Project'. You will know that a project has been recognised as a Maven project because there will be a little blue 'M' in the top left of its icon, as shown in the screenshot below:
The main thing to note in the above picture is the 'Maven Dependencies' library. This is set up automatically by the m2e plugin. Whenever you add a dependency to a POM then the project's build path will be configured automatically, although sometimes you may need to force it to do so by right clicking the project and selecting 'Maven' -> 'Update Maven Configuration'. The important thing is that if everything is working then you should never have to update the build path yourself. Moveover, if you do update it yourself then any changes you make will likely get overwritten the next time you run the 'Update Maven Configuration' command.
Also worth noting from the picture is that the two dependencies 'mavenProjectTest' and 'primes' have folder icons next to them. This means that they have been picked up as workspace projects. For this to work the project must have 'workspace resolution' enabled, and the projects to be picked up need to be configured as m2e Maven projects as well.
You mention downloading external libraries. You shouldn't need to download any libraries yourself - by adding the right dependency declaration for an external library then Maven will download it from your configured remote repository (the first time anyway - afterwards it will then be able to get it from your local repository). By default, this is the Maven Central repository. To add an external library to your project just follow that link, enter the library in the search box, click on the version link for the version you require, then you will be taken to a page where there will be the dependency XML declaration that you can just copy and paste into your POM.
One more thing that may help is that you should make sure that your source folders follow the Maven default directory structure. That is, your test packages should be contained in a source folder called 'src/test/java', and the main project packages should go in 'src/main/java'. Otherwise Maven will not know where to find your source code. It is possible to configure a POM to tell Maven to expect your source code to be in different source folders, but it is highly recommended that you follow the standard Maven directory structure.
Since you have child modules, my suggestion would be to simplify things by creating a new Maven project from scratch that you can have a play around with. Once you are comfortable with that then try getting m2e to work for your multi-module project.
I remember your pain when first getting to grips with Maven, but it's great once you understand what it's doing and everything is working. I highly recommend reading through the free online book Maven: The Complete Reference - it helped me out a lot when I was getting started with Maven.
I have experienced the same messages and have found a working solution, thanks to one of my organization's Maven experts.
Here was my pom.xml that reproduces your error:
<dependencies>
<dependency>
<groupId>org.junit4</groupId>
<artifactId>org.junit4</artifactId>
<version>4.3.1</version>
</dependency>
</dependencies>
With it, I would get package org.junit does not exist messages and NoClassDefFoundError: org/junit/Assert. Similar to your experience, it worked great from Eclipse, green bars and all.
Here is the pom.xml that works:
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
I copied this from the example at the top of this Using JUnit page.
Developing on the Mac with IntelliJ 9.0.2 Community Edition.
I have a program which depends on two library jars. I have figured out how to get IntelliJ to make me a jar of my source (with the Artifact tab), and even to include the two jars in it.
However, if I get a listing of the jar file it produces, it looks like this:
com/acme/MyClass1.class
com/acme/MyClass2.class
...
mylib1.jar
myLib2.jar
And, no surprises, if I double-click the jar file, it gets a NoClassDefFoundError the first time it tries to access a class in one or other library jar.
It seems I need to tell IntelliJ to "inline" the library jars -- but this menu option is always greyed out!
Does anyone have any idea how to get jars inlined in a jar artifact?
IDEA doesn't support it yet, you can use Ant integration to package your jar (either by unpacking all the jars into the temp folder and then packaging the project output plus this temp folder into the single jar or by using some Ant task like jarjar).
If you want this feature to appear in the future IDEA versions, please vote for the request.
Having the dependency JARs included in your JAR should allow yoru code to run successfully. You probably don't have the JARs on your classpath.
I will use Maven Assembly plugin. Its simple and will give you a neat little jar file..