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# JDK8+111 disables (by default) `BASIC` for Proxy
One may encounter Proxy issues with resent JDK

https://confluence.atlassian.com/kb/basic-authentication-fails-for-outgoing-proxy-in-java-8u111-909643110.html

http://www.oracle.com/technetwork/java/javase/8u111-relnotes-3124969.html

> In some environments, certain authentication schemes may be undesirable when proxying HTTPS. Accordingly, the Basic authentication scheme has been deactivated, by default, in the Oracle Java Runtime .. Now, proxies requiring Basic authentication when setting up a tunnel for HTTPS will no longer succeed by default. If required, this authentication scheme can be reactivated by removing Basic from the jdk.http.auth.tunneling.disabledSchemes networking property, or by setting a system property of the same name to "" ( empty ) on the command line.

You can then:

    -Djdk.http.auth.tunneling.disabledSchemes=""
    
see also https://youtrack.jetbrains.com/issue/IDEA-185083

# NTLM Proxy

In case of NTLM proxy, the default mvn wagon may not be functional. An alternative is to rely on the lightweight http wagon:

```


  [...]
  
    
      org.apache.maven.wagon
      wagon-http-lightweight
      3.5.3
    
  

```

see https://maven.apache.org/guides/mini/guide-using-extensions.html
see https://maven.apache.org/guides/mini/guide-wagon-providers.html
see https://mvnrepository.com/artifact/org.apache.maven.wagon/wagon-http-lightweight

In some  cases, the proxy expect the password not to be defined/left empty to let NTLM do its work:

```
   
      example-proxy
      true
      http
      proxy.example.com
      8080
      proxyuser
      somepassword
      www.google.com|*.example.com
    
```

see https://maven.apache.org/guides/mini/guide-proxies.html

# Documentation about proxy

https://developer.mozilla.org/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file