Related
I'm trying to find out where the dependencies are coming from for a particular plugin goal. I know the dependencies exist because Maven downloaded them when I ran the goal for the first time. And they're not (directly) dependencies of my project, because I ran mvn clean install first, and these dependencies weren't downloaded then.
In this specific case, I'm trying to figure out what the dependencies are when I run mvn sonar:sonar, but I expect the answer will be general purpose. For instance, even though I've built this project a number of times, when I ran that goal Maven downloaded a bunch of new jars like maven-antrun-plugin.
Here are things I've tried:
mvn dependency:tree shows the dependencies for the project, but not for the plugin goal (it doesn't include anything related to SonarQube in the list).
mvn org.apache.maven.plugins:maven-help-plugin:3.2.0:effective-pom -Dverbose=true also doesn't include anything related to SonarQube.
mvn -X sonar:sonar prints out what looks like a dependency graph, but it's missing the jars that Maven downloaded the first time I ran the sonar:sonar goal.
mvn -X dependency:resolve-plugins seems to be meant to download the dependencies of plugins, but does not capture the sonar:sonar dependencies. If I clear out my Maven cache, run mvn dependency:resolve-plugins, and then run mvn sonar:sonar, Maven has to download jars.
Use your IDE to navigate to the POM of the plugin project and then look at the dependency tree.
Or do this manually by copying the plugin POM to your file system and running mvn dependency:tree.
The dependencies downloaded by maven are generally stored locally on the pc at the address C:\Users\yourUser/.m2 this regardless of your projects and so that you do not have to reload dependencies that you are already using in other projects.
I hope I have understood your question and that my answer is useful to you, greetings.
Generally i follow below maven commands to build and run my project.
mvn clean
mvn clean verify
or
mvn clean install
mvn spring-boot:run
My doubt is in which maven life cycle, dependencies get downloaded from maven central repository to my local .m2 repository.
I went through below mentioned maven life cycle but no where i found that in this steps dependency gets downloaded.
validate
compile
test
package
verify
install
deploy
Please explain it would be really helpful.
When you create a maven project, before validate there is step 'prepare-resources' which copies resources. Also when you do maven clean it will download dependencies. Read this link for more details
https://www.tutorialspoint.com/maven/maven_build_life_cycle.htm
The other answer here of prepare-resources is incorrect. That may be confusing the downloading of Maven plugins and their dependencies, but not the project's dependencies.
They actually are downloaded during the compile lifecycle.
Here is an example of a project where the only dependency is GSON, and I just finished running the process-resources lifecycle, the one that immediately precedes compile lifecycle. The only things present in my .m2/repository directory are things required by the default Maven plugins. Note that there is no com folder, which is where GSON would have been downloaded to.
After running mvn compile, the next lifecycle, a lot more dependencies are downloaded, including GSON:
I did mvn install and get this error message
Failed to execute goal on project core: Could not resolve dependencies for project test:core:jar:2.0.1-SNAPSHOT: Could not find artifact lib-net:lib-net:jar:1.0.8 in central (http://repo.maven.apache.org/maven2)
this dependency is a Project of mine, which is available in the local repository ~/.m2
so I tried mvn install -o to force maven to use my local repository, and I get this
Failed to execute goal on project core: Could not resolve dependencies for project test:core:jar:2.0.1-SNAPSHOT: The repository system is offline but the artifact lib-net:lib-net:jar:1.0.8 is not available in the local repository.
I tried to delete my local repository and install everything again, but it doesn't solve my problem!
Any sugestions?
The problem is with maven version. I had the same issue on my Jenkins machine. I followed these steps and it resolved my issue:
Delete the specific older libraries in ~/.m2/
Change the version of maven to apache-maven-3.5.0
Re-run the maven goals
Think I know way how to do it properly
Download sources of your library locally
Go to ~/.m2/ and search for your lib
Delete it from here
perform "mvn clean install" for your library
search for your lib in ~/.m2/
try to "mvn clean install" on your main project
... ?
Profit
If it will no work, check that you use correct artifact id and group id.
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 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.