Unable to import maven project

I'm using 142.3553.1. Sometimes idea cannot import a maven project. The errors are:

4:02:29 PM Unable to import maven project: See logs for details
4:02:29 PM NoClassDefFoundError: com/google/common/base/Function

And for the same project, sometimes it can.

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Could you reproduce the issue and attach the whole idea.log file, please?

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Thanks for replying.

For a default project, I set up maven in idea like this: maven-3.3.3, maven-3.3.3\conf\settings.xml which is
<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <localRepository>C:\working\dev\maven_repo</localRepository>
  <proxies>
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>qwertyu</username>
      <password>qwer1234</password>
      <host>proxy.xxx.com</host>
      <port>8080</port>
      <nonProxyHosts>xxx.com</nonProxyHosts>
    </proxy>
  </proxies>
</settings>

Then everything is ok. By the way, I also set the proxy in idea to the host, port, username and password as above.
After that I switch to maven-3.0.3, C:\Users\qwertyu\.m2\settings.xml which is
<?xml version="1.0" encoding="UTF-8"?>
<settings>
    <localRepository>C:\working\dev\maven_repo</localRepository>
    <mirrors>
        <mirror>
            <id>plasma-central</id>
            <name>Plasma Central</name>
            <mirrorOf>*</mirrorOf>
            <url>http://plasmadev.xxx.com:8000/nexus/content/groups/plasma-development</url>
        </mirror>

    </mirrors>

</settings>
And I get issues "Unable to import maven project".

1st edit: after being unable to import maven project with maven-3.0.3, I try to import with maven-3.3.3 and surprisingly I cannot import a maven project this time. Another log file is attached (all the log messages from the previous try were deleted in this file).


Attachment(s):
idea.log.zip
idea.log.zip
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Unfortunately, I can not reproduce the issue.
Btw, does it help if you close IDEA after maven version switch?

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I cannot reproduce it now either. Now everything is smooth. Have no idea what had happened. I think it only happens when the environment has some issue. If the idea code can tell what was happening when the NoClassDefFound exception occurred, then it will be very helpful.

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