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What can I do to make the following Gradle project build succesfully?

I've build a new project. settings.gradle is:

rootProject.name = 'myproject'

build.gradle is:

group 'mygroup' version '1.0-SNAPSHOT' apply plugin: 'groovy' apply plugin: 'java' apply plugin: 'idea' sourceCompatibility = 1.5 repositories { mavenLocal() mavenCentral() maven { url "https://plugins.gradle.org/m2/" } maven { url "https://mvnrepository.com/artifact/org.apache.commons/commons-lang3" } } dependencies { compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.6' compile 'org.codehaus.groovy:groovy-all:2.3.11' testCompile group: 'junit', name: 'junit', version: '4.11' }

If I use "Refresh all gradle projects" in the Gradle Tool Window, the Event Log says:

Unindexed remote maven repositories found. [Disable...] The following repositories used in your gradle projects were not indexed yet: https://plugins.gradle.org/m2 https://mvnrepository.com/artifact/org.apache.commons/commons-lang3

Project Structure --> Problems tells me:

Library Gradle: org.apache.commons:commons-lang3:3.6 has broken classes path:   /home/myhome/git/myproject/Could not resolve org.apache.commons:commons-lang3:3.6.

Does anybody know a good instruction website for building gradle projects (other than Getting started with Gradle)? I've also re-setup the project based on these instructions, but I cannot resolve any dependencies either. (auto-import enabled and using a Gradle wrapper)

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    The problem seems to be in maven { url "https://mvnrepository.com/artifact/org.apache.commons/commons-lang3" } line as repository should specify the root host, not some specific package. Commented Aug 7, 2017 at 11:26
  • Thanks @CrazyCoder for this information! Please apologize my question, but how is the root host's URL then in this case? (It doesn't seem to be https://mvnrepository.com/artifact/. At least, this does not make any difference for the success of my build.) Commented Aug 7, 2017 at 13:32
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    Why do you need this custom repository anyway? Do you think mavenCentral has no commons-lang3? Commented Aug 7, 2017 at 13:51
  • You're right, mavenCentral provides commons-lang3 as well. So, if I drop this mvnrepository entry and reduce "repositories" to mavenCentral(), the problem remains that I can not resolve any dependency. (Gradle projects view shows red underlining "Unable to resolve..." for whichever SourceSet.) Commented Aug 7, 2017 at 14:29
  • Does it build from the command line Gradle outside of IntelliJ IDEA? Commented Aug 7, 2017 at 14:30

2 Answers 2

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Do you have maven installed?

With regards to mavenLocal() Gradle goes and reads ~/.m2/settings.xml to find the info about where is your repo situated, when it can't find any info it is going to assume it's '~/.m2/repository'

Please update the question with the IntelliJ version you are using as versions from 2015, 2016 wasn't that good with Gradle integration yet, if you are using an outdated version, I recommend downloading latest and trying again.

You can use some kind of a workaround for this, in your build.gradle apply plugin: 'idea' and then on the command line do gradle cleanIdea idea - this will delete and recreate your idea files .iws .ipr .iml and recrete the classhpaths and your project should refresh in IntelliJ and work just fine

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The IntelliJ update hint is useful here. In fact, I had already updated from 2016.3 to 2017.2. After I created another project from scratch, the IDE asked me to leave "Gradle offline mode" - which I never had activated intentionally. I then returned to my former project and resolvements and imports work well now.
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The problem disappeared after:

  • upgrading from IntelliJ 2016.3 to 2017.2
  • setting up another project from scratch
  • being asked to deactivate "Gradle offline mode" - and answering yes.

Obviously the problem was the "Gradle offline mode" which can be directly deactivated as described in this answer.

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