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I am following advice from the mvn project to use multiple artifact threads for parallel artifact resolution. This command seems to give me the desired result.

mvn -Dmaven.artifact.threads=10 dependency:resolve-plugins

Will this settings.xml automatically set maven.artifact.threads on every call to mvn?

<settings xmlns="http://maven.apache.org/SETTINGS/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd"> <profiles> <profile> <id>moreDependencyThreads</id> <activation> <property> <name>maven.artifact.threads</name> <value>10</value> </property> <activeByDefault>true</activeByDefault> </activation> </profile> </profiles> <activeProfiles> <activeProfile>moreDependencyThreads</activeProfile> </activeProfiles> </settings>
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  • Which maven version do you use? Commented May 18, 2016 at 23:20
  • 2
    System Properties can't be defined in settings.xml. Commented May 19, 2016 at 7:56
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    You know that by default already 5 threads used? Commented May 19, 2016 at 13:54
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    I did not. It seems that my question is answered. The defaults are OK and I cannot change system properties using settings.xml. Thank you for your help @khmarbaise! Commented May 19, 2016 at 14:14

2 Answers 2

Reset to default
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You can set this property in your settings.xml file by changing it as follows:

<settings xmlns="http://maven.apache.org/SETTINGS/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd"> <profiles> <profile> <id>moreDependencyThreads</id> <activation> <activeByDefault>true</activeByDefault> </activation> <properties> <maven.artifact.threads>10</maven.artifact.threads> </properties> </profile> </profiles> </settings>
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4 Comments

Does that create a user property or set a system property? maven.apache.org/settings.html#Properties
When I tried this, mvn clean install -X printed out [DEBUG] properties used {java.vendor=Oracle Corporation, sun.java.launcher=SUN_STANDARD, env.XPC_SERVICE_NAME=0, sun.management.compiler=HotSpot 64-Bit Tiered Compilers, os.name=Mac OS X, ..., line.separator= , java.vm.name=Java HotSpot(TM) 64-Bit Server VM, maven.artifact.threads=10, file.encoding=UTF-8, java.specification.version=1.8, ...}, so it has set the desired property value.
When using Maven 3.2.5 and the -X option I don't see any output like [DEBUG] properties used ... :-(
No need for activeProfiles is there is activeByDefault is true.
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As it also specified in tutorial, you can make it permanent via:

export MAVEN_OPTS=-Dmaven.artifact.threads=10

If you call that it will be permanent for that session, if you add tis to your ~/.bash_profile it will be permanent for that user. Now on every call maven will work with these options.

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Is it possible to define these options in settings.xml instead of in environment variables?
You can make the reverse of what you want but I am not sure about your request. Why you want to do that?
If I define this in settings.xml I can create a recommended settings.xml file for my team. It can define our best practices. Adding or setting environment variables is acceptable but not as portable.

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