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i am new to java and have mainly used node.js for most of my projects. I have used npm and used the npm install function to download packages. In maven, is there a similar function that easily installs packages?
mvn dependency:resolve
Is worth take a look to mvn life cycles
There's also mvn dependency:go-offline to download the dependencies and prepare to run the rest of the tasks without any connection to the internet.
I was looking for a way to install maven dependencies during a CI job, while explicitly NOT compiling the code or running the tests.
Keep all the dependencies in your pom.xml(You can think of this as package.json). If you are using an IDE like eclipse it will automatically download the dependencies for you. If you want to download the dependencies from the command line run mvn install.
You can find the corresponding XML for dependencies here https://mvnrepository.com/
Maven doesn't have an install command. Before any task you run maven checks if the project was changed and downloads any new dependency you specified from Maven Central repository.
EDIT: Maven calls the resolver for most tasks you run.
I imported my already working project on another computer and it started to download dependencies.
Apparently my internet connection crashed and now I get the following:
>Build errors for comics; org.apache.maven.lifecycle.LifecycleExecutionException:
Failed to execute goal on project comicsTest: Could not resolve dependencies for project comicsTest:comicsTest:war:0.0.1-SNAPSHOT:
The following artifacts could not be resolved:
org.springframework:spring-context:jar:3.0.5.RELEASE,
org.hibernate:hibernate-entitymanager:jar:3.6.0.Final,
org.hibernate:hibernate-core:jar:3.6.0.Final,
org.hibernate:hibernate-commons-annotations:jar:3.2.0.Final,
org.aspectj:aspectjweaver:jar:1.6.8,
commons-lang:commons-lang:jar:2.5,
>mysql:mysql-connector-java:jar:5.1.13: Failure to transfer org.springframework:spring-context:jar:3.0.5.RELEASE from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced.
>Original error: Could not transfer artifact org.springframework:spring-context:jar:3.0.5.RELEASE from central (http://repo1.maven.org/maven2): No response received after 60000
How do I force maven to update?
mvn clean install -U
-U means force update of snapshot dependencies.
Release dependencies will be updated this way if they have never been previously successfully downloaded. ref: https://stackoverflow.com/a/29020990/32453
If your local repository is somehow mucked up for release jars as opposed to snapshots (-U and --update-snapshots only update snapshots), you can purge the local repo using the following:
mvn dependency:purge-local-repository
You probably then want to clean and install again:
mvn dependency:purge-local-repository clean install
Lots more info available at https://maven.apache.org/plugins/maven-dependency-plugin/examples/purging-local-repository.html
-U seems to force update of all SNAPSHOT dependencies.
If you want to update a single dependency without clean or -U you could just remove it from your local repo and then build.
The example below if for updating slf4j-api 1.7.1-SNAPSHOT:
rm -rf ~/.m2/repository/org/slf4j/slf4j-api/1.7.1-SNAPSHOT
mvn compile
All the answers here didn't work for me. I used the hammer method:
find ~/.m2/ -name "*.lastUpdated" | xargs rm
That fixed the problem :-)
You can do effectively from Eclipse IDE. Of course if you are using it.
Project_Name->Maven->Update Project Configuration->Force Update of Snapshots/Releases
Just in case someone wants only update project's snapshot dependencies and doesn't want to install artifact:
mvn dependency:resolve -U
Don't forget to reimport dependencies in your IDE. In IDEA you need to right click on pom file and choose Maven -> Reimport
If you're unsure what is inside your local repository, I recommend to fire a build with the option:
-Dmaven.repo.local=localrepo
That way you'll ensure to build in a cleanroom environment.
In my case first I did was:
mvn clean install -U
Still it was showing same error then I closed project and again reopened it. Finally worked.
If you are using eclipse IDE then :
Select Project.
Press alt+F5, window for Update Maven Project will pop up.
Check - Force Update of Snapshots/releases and click OK.
If Using Intellij IDE
go to settings/Maven
check Always update snapshots
I used the IntelliJ IDE and I had a similar problem and to solve I clicked in "Generate Sources and Update Folders for All Projects" in Maven tab.
Previous versions of maven did not force the check for missing releases when used -U with mvn clean install, only the snapshots, though newer version supports this.
For someone still struggling with previous version, following can be helpful-
On Windows:
cd %userprofile%\.m2\repository
for /r %i in (*.lastUpdated) do del %i
On Linux:
find ~/.m2 -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;
Whenever maven can't download dependencies for any reason (connectivity/not exists etc), it will add the ".error=Could not transfer artifact" in dependency-name.lastUpdate file in respective folder under $home/.m2 directory. Removing these files will force maven to try fetching the dependencies again.
mvn clean install -e -U -Dmaven.test.skip=true
-e Detailed exception
-U forced update
-DskipTests does not execute test cases, but compiles test case classes to generate corresponding class files under target/test classes.
-Dmaven.test.skip=true, do not execute test cases or compile test case classes.Using maven. test. skip not only skips running unit tests, but also skips compiling test code.
A small suggestion. If you use the IntelliJ Idea compiler, it is recommended to clean the cache
I've got the error in an other context.
So my solution might be useful to others who stumple upon the question:
The problem:
I've copied the local repository to another computer, which has no connection to a special repository.
So maven tried to check the artifacts against the invalid repository.
My solution:
Remove the _maven.repositories files.
You need to check your settings.xml file under <maven_home>/conf directory.
This is one of the most annoying things about Maven. For me the following happens: If I add a dependency requesting more dependencies and more and more but have a slow connection, it seams to stop while downloading and timing out. While timing out all dependencies not yet fetched are marked with place holders in the .m2 cache and Maven will not (never) pick it up unless I remove the place holder entry from the cache (as other stated) by removing it.
So as far as I see it, Maven or more precise the Eclipse Maven plugin has a bug regarding this. Someone should report this.
It's important to add that the main difference of running mvn with -U and without -U is that -U will override your local SNAPSHOT jars with remote SNAPSHOT jars.
Local SNAPSHOT jars created from local mvn install in cases where you have other modules of your proj that generate jars.
For fixing this issue from Eclipse:
1) Add below dependency in Maven pom.xml and save the pom.xml file.
<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.3.1</version>
</dependency>
2) Go to project >> Maven >> Update Project
select the project and click OK.
3) Optional step, if it's not resolved till step 2 then do below step after doing step-1
Go to project >> Maven >> Update Project >> check in the checkbox 'Force Update of Snapshots/Releases'
select the project and click OK.
-U is used to force update maven Repo.
Use
mvn -U clean install
I've got the same error with android-maps-utils dependency. Using aar type package in dependency section solve my problem.
By default type is jar so It might be checked what type of dependency in repository is downloaded.
I tried all the answers here but nothing seemed to work. Restarted my computer first then ran mvn clean install -U. That solved my problem.
What maven does is, it downloads all your project's dependencies into your local repo (.m2 folder). Because of the internet causing issues with your local repo, you project is facing problems. I am not sure if this will surely help you or not but you can try deleting all the files within the repository folder inside the .m2 folder. Since there would be nothing in the local repo, maven would be forced to download the dependencies again, thus forcing an update.
Generally, the .m2 folder is located at c:users:[username]:.m2
after using mvn clean install -U run as maven test also and after that update your project using maven-update project
this works in my case
I had this problem for a different reason. I went to the maven repository https://mvnrepository.com looking for the latest version of spring core, which at the time was 5.0.0.M3/ The repository showed me this entry for my pom.xml:
<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.0.M3</version>
</dependency>
Naive fool that I am, I assumed that the comment was telling me that the jar is located in the default repository.
However, after a lot of head-banging, I saw a note just below the xml saying "Note: this artifact it located at Alfresco Public repository (https://artifacts.alfresco.com/nexus/content/repositories/public/)"
So the comment in the XML is completely misleading. The jar is located in another archive, which was why Maven couldn't find it!
We can force to get latest update of release and snapshot repository with below command :
mvn --update-snapshots clean install
I had the same error and running mvn install -U and then running mvn install worked for me.
mvn clean install -U doesn't work. However mvn -U clean followed by mvn clean install does.
I honestly don't know anything about java, I'm just trying to build the latest version of this project to try and work around bugs in the version that is packaged by my OS. The project in question:
https://sourceforge.net/projects/tuxguitar/
I tried running mvn compile, mvn clean package, and mvn clean install but no jar file was produced in the source tree. The readme has no instructions for building. Any help would be greatly appreciated!
Thanks!
To produce jar you need at least package phase, you can get there by doing:
mvn clean package
(clean is to remove stale data, it is a good practice to use it always with maven) and you jar will be in target directory.
mvn complite just complite the project and no package.
answer : mvn clean package.this will clean,complite and package the project,after finished, you can found the package(jar or war) into the $PROJECT_HOME/target/ folder.
I usually run mvn clean install - which in addition will add the built jar into your local maven artifact repository.
I imported my already working project on another computer and it started to download dependencies.
Apparently my internet connection crashed and now I get the following:
>Build errors for comics; org.apache.maven.lifecycle.LifecycleExecutionException:
Failed to execute goal on project comicsTest: Could not resolve dependencies for project comicsTest:comicsTest:war:0.0.1-SNAPSHOT:
The following artifacts could not be resolved:
org.springframework:spring-context:jar:3.0.5.RELEASE,
org.hibernate:hibernate-entitymanager:jar:3.6.0.Final,
org.hibernate:hibernate-core:jar:3.6.0.Final,
org.hibernate:hibernate-commons-annotations:jar:3.2.0.Final,
org.aspectj:aspectjweaver:jar:1.6.8,
commons-lang:commons-lang:jar:2.5,
>mysql:mysql-connector-java:jar:5.1.13: Failure to transfer org.springframework:spring-context:jar:3.0.5.RELEASE from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced.
>Original error: Could not transfer artifact org.springframework:spring-context:jar:3.0.5.RELEASE from central (http://repo1.maven.org/maven2): No response received after 60000
How do I force maven to update?
mvn clean install -U
-U means force update of snapshot dependencies.
Release dependencies will be updated this way if they have never been previously successfully downloaded. ref: https://stackoverflow.com/a/29020990/32453
If your local repository is somehow mucked up for release jars as opposed to snapshots (-U and --update-snapshots only update snapshots), you can purge the local repo using the following:
mvn dependency:purge-local-repository
You probably then want to clean and install again:
mvn dependency:purge-local-repository clean install
Lots more info available at https://maven.apache.org/plugins/maven-dependency-plugin/examples/purging-local-repository.html
-U seems to force update of all SNAPSHOT dependencies.
If you want to update a single dependency without clean or -U you could just remove it from your local repo and then build.
The example below if for updating slf4j-api 1.7.1-SNAPSHOT:
rm -rf ~/.m2/repository/org/slf4j/slf4j-api/1.7.1-SNAPSHOT
mvn compile
All the answers here didn't work for me. I used the hammer method:
find ~/.m2/ -name "*.lastUpdated" | xargs rm
That fixed the problem :-)
You can do effectively from Eclipse IDE. Of course if you are using it.
Project_Name->Maven->Update Project Configuration->Force Update of Snapshots/Releases
Just in case someone wants only update project's snapshot dependencies and doesn't want to install artifact:
mvn dependency:resolve -U
Don't forget to reimport dependencies in your IDE. In IDEA you need to right click on pom file and choose Maven -> Reimport
If you're unsure what is inside your local repository, I recommend to fire a build with the option:
-Dmaven.repo.local=localrepo
That way you'll ensure to build in a cleanroom environment.
In my case first I did was:
mvn clean install -U
Still it was showing same error then I closed project and again reopened it. Finally worked.
If you are using eclipse IDE then :
Select Project.
Press alt+F5, window for Update Maven Project will pop up.
Check - Force Update of Snapshots/releases and click OK.
If Using Intellij IDE
go to settings/Maven
check Always update snapshots
I used the IntelliJ IDE and I had a similar problem and to solve I clicked in "Generate Sources and Update Folders for All Projects" in Maven tab.
Previous versions of maven did not force the check for missing releases when used -U with mvn clean install, only the snapshots, though newer version supports this.
For someone still struggling with previous version, following can be helpful-
On Windows:
cd %userprofile%\.m2\repository
for /r %i in (*.lastUpdated) do del %i
On Linux:
find ~/.m2 -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;
Whenever maven can't download dependencies for any reason (connectivity/not exists etc), it will add the ".error=Could not transfer artifact" in dependency-name.lastUpdate file in respective folder under $home/.m2 directory. Removing these files will force maven to try fetching the dependencies again.
mvn clean install -e -U -Dmaven.test.skip=true
-e Detailed exception
-U forced update
-DskipTests does not execute test cases, but compiles test case classes to generate corresponding class files under target/test classes.
-Dmaven.test.skip=true, do not execute test cases or compile test case classes.Using maven. test. skip not only skips running unit tests, but also skips compiling test code.
A small suggestion. If you use the IntelliJ Idea compiler, it is recommended to clean the cache
I've got the error in an other context.
So my solution might be useful to others who stumple upon the question:
The problem:
I've copied the local repository to another computer, which has no connection to a special repository.
So maven tried to check the artifacts against the invalid repository.
My solution:
Remove the _maven.repositories files.
You need to check your settings.xml file under <maven_home>/conf directory.
This is one of the most annoying things about Maven. For me the following happens: If I add a dependency requesting more dependencies and more and more but have a slow connection, it seams to stop while downloading and timing out. While timing out all dependencies not yet fetched are marked with place holders in the .m2 cache and Maven will not (never) pick it up unless I remove the place holder entry from the cache (as other stated) by removing it.
So as far as I see it, Maven or more precise the Eclipse Maven plugin has a bug regarding this. Someone should report this.
It's important to add that the main difference of running mvn with -U and without -U is that -U will override your local SNAPSHOT jars with remote SNAPSHOT jars.
Local SNAPSHOT jars created from local mvn install in cases where you have other modules of your proj that generate jars.
For fixing this issue from Eclipse:
1) Add below dependency in Maven pom.xml and save the pom.xml file.
<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.3.1</version>
</dependency>
2) Go to project >> Maven >> Update Project
select the project and click OK.
3) Optional step, if it's not resolved till step 2 then do below step after doing step-1
Go to project >> Maven >> Update Project >> check in the checkbox 'Force Update of Snapshots/Releases'
select the project and click OK.
-U is used to force update maven Repo.
Use
mvn -U clean install
I've got the same error with android-maps-utils dependency. Using aar type package in dependency section solve my problem.
By default type is jar so It might be checked what type of dependency in repository is downloaded.
I tried all the answers here but nothing seemed to work. Restarted my computer first then ran mvn clean install -U. That solved my problem.
What maven does is, it downloads all your project's dependencies into your local repo (.m2 folder). Because of the internet causing issues with your local repo, you project is facing problems. I am not sure if this will surely help you or not but you can try deleting all the files within the repository folder inside the .m2 folder. Since there would be nothing in the local repo, maven would be forced to download the dependencies again, thus forcing an update.
Generally, the .m2 folder is located at c:users:[username]:.m2
after using mvn clean install -U run as maven test also and after that update your project using maven-update project
this works in my case
I had this problem for a different reason. I went to the maven repository https://mvnrepository.com looking for the latest version of spring core, which at the time was 5.0.0.M3/ The repository showed me this entry for my pom.xml:
<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.0.M3</version>
</dependency>
Naive fool that I am, I assumed that the comment was telling me that the jar is located in the default repository.
However, after a lot of head-banging, I saw a note just below the xml saying "Note: this artifact it located at Alfresco Public repository (https://artifacts.alfresco.com/nexus/content/repositories/public/)"
So the comment in the XML is completely misleading. The jar is located in another archive, which was why Maven couldn't find it!
We can force to get latest update of release and snapshot repository with below command :
mvn --update-snapshots clean install
I had the same error and running mvn install -U and then running mvn install worked for me.
mvn clean install -U doesn't work. However mvn -U clean followed by mvn clean install does.
is there a quicker way to maven install say a complete lib folder to maven dependencies rather than the individual command for each jar:
mvn install:install-file -DgroupId=third-party -DartifactId=app-eventinfo -Dversion=1.0 -Dpackaging=jar -Dfile=EventInfoToOrder.jar
Is there a way I can say this is a folder of dependencies or a little work around in eclipse where I trick maven into using a user defined library as a dependency.
Yes I have a lot of folders that have been sitting on my buildpath which I must install to my local repo.
Cheers for reading :)
The problem is not about the folder contents, but specifying the correct values for groupId, artifactId and version.
If you are ok with random values for this, then you could write a dirty batch file/shell script to do this.
Otherwise, the time you spend trying to automate this (by having a mapping of groupId, artifactId and version for each jar in your folders), you can arguably do mvn install:install-file manually.
A better option would be to review your dependencies and see which are not available in maven repo and only install those. The remaining will be downloaded by maven on its own.
There is no standard way of doing this as it would go against Maven's philosophy of managed (versioned) dependencies.