title: Plugin org.codehaus.mojo:exec-maven-plugin:1.5.0 or one of its dependencies could not be resolved
body: <p>I am trying to run my first project "Calculator" on netbeans-11 july version and it gives this error -<br>
  Plugin org.codehaus.mojo:exec-maven-plugin:1.5.0 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.codehaus.mojo:exec-maven-plugin:jar:1.5.0: Could not transfer artifact org.codehaus.mojo:exec-maven-plugin:pom:1.5.0 from/to central (<a href="https://repo.maven.apache.org/maven2" rel="nofollow noreferrer">https://repo.maven.apache.org/maven2</a>): Connect to repo.maven.apache.org:443 [repo.maven.apache.org/151.101.196.215] failed**: Connection timed out: connect -> [Help 1]</p>
  
  <p>my pom.xml file - </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;project xmlns="http://maven.apache.org/POM/4.0.0" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
  http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt;
  &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  &lt;groupId&gt;com.mycompany&lt;/groupId&gt;
  &lt;artifactId&gt;Calculator&lt;/artifactId&gt;
  &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt;
  &lt;packaging&gt;jar&lt;/packaging&gt;
  &lt;properties&gt;
      &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
      &lt;maven.compiler.source&gt;12&lt;/maven.compiler.source&gt;
      &lt;maven.compiler.target&gt;12&lt;/maven.compiler.target&gt;
  &lt;/properties&gt;
  &lt;/project&gt;
  </code></pre>
  
  <p>how to resolve this ?</p>