Intellij Community can't use http proxy for Maven

Question

I have Intellij IDEA Community installed on a Linux box that needs to use an authenticated proxy to get to the Internet. I have a system-wide proxy on the box that works, and I have the proxy configured in ~/.m2/settings.xml. Maven correctly uses the proxy when I run try it from the command-line.

I have the same proxy configured within Intellij and it gives me the plugins listing correctly. But when I try to sync with the Maven repository withing Intellij I keep getting this:

[WARNING] Unable to get resource 'org.codehaus.mojo:hibernate3-maven-plugin:pom:2.2'  from  repository restlet (http://maven.restlet.org): Authorization failed: Not    authorized by proxy. 

I went to Settings->Maven and put in the proxy info as properties and that didn't work. I can see by looking at those settings that Intellij is reading my ~./m2/settings.xml fine because it knows where my local repo is (it's in a non-standard place).

Anyone know how I can get this working?

Answer 1

I had the same problem running maven inside IntelliJ whilst behind an NTLM proxy. The working solution was as follows:

1. Download and install CNTLM. Excellent post here on how to do this https://stackoverflow.com/a/23962313/3298801
2. Set and test your local proxy settings in IntelliJ via Settings >> System Settings >> HTTP Proxy.
3. In Intellij set the maven runner. Within Settings >> Maven >> runner set VM options to:
   -DproxySet=true -DproxyHost=localhost -DproxyPort=3132
4. Restart Intellij
5. Note within ~/.m2/settings.xml I also added my proxy config as:

<proxies>         <proxy>             <active>true</active>             <protocol>https</protocol>             <host>localhost</host>             <port>3132</port>          </proxy> </proxies> 

Answer 2

1. Navigate to Maven > Importing¹. inside the IntelliJ IDEA Settings (which is found under File > Settings).

2. The second last option in Maven > Importing is a field named "VM options for importer". Append the following to whatever already exists there:

   -DproxySet=true -DproxyHost=myproxy.com -DproxyPort=3128

   Here, replace myproxy.com with your proxy server, (e.g. http://myproxyserver.com). Replace 3128 with your proxy port (e.g. 8080).

3. Do the same under Maven > Runner¹

4. Apply and close the settings window.

It should work now.

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¹ This may be nested under Build, Execution, Deployment > Build Tools >, depending on the version of IntelliJ you're using.