kdevo/IntelliJ + Maven - Unresolved Plugin.md

## IntelliJ + Maven - Unresolved Plugin.md

      
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              IntelliJ + Maven - Unresolved Plugin.md
            
          
    IntelliJ IDEA and Maven - "Unresolved Plugin" Solutions

⚠️ Probably outdated (from 2016).
Related:

https://intellij-support.jetbrains.com/hc/en-us/community/posts/206434489
https://youtrack.jetbrains.com/issue/IDEA-127515

Symptoms


After adding a plugin or a dependency to pom.xml and auto-importing changes or importing changes manually, the plugin or dependency is still not resolved/downloaded


Check via CTRL+SHIFT+A -> Enter "Maven Projects" (you would a red underlined plugin or dependency)


"Cannot reconnect" to remote Maven central repository


Check via CTRL+SHIFT+A -> Enter "Maven Settings" > Repositories (you would see a red entry)

Causes (only assumptions)


Corrupted download: background process has been interrupted/aborted...

due to a network problem
(un)intentionally by the user


After downloading the archive, while extracting the archive, IntelliJ aborts the process because of too low disk space
Simultaneous downloads from the Maven repository (?)

Solutions - tested on Linux

Before you try any of these solutions, save your work, clear IntelliJ's cache via File > "Invalidate Cache / Restart" and check if the problem persists.
Please also try if a simple "Reimport All Maven Projects" (type as action using CTRL+SHIFT+A) changes anything.
1. Solution - "Unresolved plugin"

If you have multiple unresolved plugins, it's maybe less work for you to follow the second solution instead to redownload all plugins at once.
Let's assume the plugin's full name which causes the problem is: org.apache.maven.plugins:maven-shade-plugin:2.4.3:shade (replace with your plugin's name)


Close IntelliJ
Get the path of your plugin. The path of the example plugin would be org/apache/maven/plugins/maven-shade-plugin (substitute '.' and ':' with '/')
Navigate to the affected plugin directory and delete it:

cd ~/.m2/repository/org/apache/maven/plugins/maven-shade-plugin
ls -a # should show a directory named after your plugin's version number
mv 2.4.3 2.4.3_old

Start IntelliJ again
CTRL+SHIFT+A -> Enter "Reimport All Maven Projects"
If the problem still persists, try the second solution below

2. Solution - "Cannot reconnect" to Maven repository


Make sure that you have enough disk space (especially when using a VM)
Try to update the repository CTRL+SHIFT+A -> Enter "Maven Settings" > Repositories -> select the red entry and click "Update"
Wait and drink ☕. This possibly takes a long time depending on your system, especially after the download has finished. The progress bar stands still but package extraction is in progress, please be patient.
If IntelliJ fails and the problem still persists: close IntelliJ, then:

cd ~/.m2
mv repository repository_old

Update as descibed in 2.