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From Charles Honton <>
Subject Re: [Help] Force maven[-surefire] to run in parallel
Date Wed, 15 Mar 2017 14:14:57 GMT
You should consider that if the project’s tests were not written with multi-threading in
mind, they may fail.

> On Mar 15, 2017, at 6:56 AM, Thomas Broyer <> wrote:
> Hi,
> On Wed, Mar 15, 2017 at 2:11 PM Luis Henrique de Souza Melo <
>> wrote:
>> Hi,
>> I am a student at the Federal University of Pernambuco, and our group is
>> having some issues with Maven to run some tests in a huge amount of
>> projects.
>> We plan to run all theses open-source projects tests in parallel and in
>> sequential using its own maven. However, we cannot change every pom.xml
>> from every module and/or project main pom.xml manually.
>> Is there any way to force maven and/or surefire to run in parallel using a
>> command line argument, like: mvn test --parallel 3 -fae
>> Or even in sequential mode would help us like: mvn test --sequential -fae
> All parallelism-related properties can be set using "user properties",
> which means you can set them from the command line (if they haven't been
> set explicitly in the POMs); e.g. for forkCount [1] you can call Maven as
> "mvn -DforkCount=2 test" to set the forkCount property to 2. If the
> properties have been set in the POM, if they have been set using a property
> value (e.g. <forkCount>${}</forkCount>) then you can override
> the property from the command line (i.e. "mvn test"). If
> the properties have been set with hard-coded values (e.g.
> <forkCount>1</forkCount>) then you have no other choice than to edit the
> POMs.
> And then you can tell Maven to parallelize the build with -T.
> Actually, everything seems to be described in the Surefire documentation [2]
> [1]
> [2]

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