How do I get javadoc to link to the Java API using an Ant task?

Right now my ant task looks like.

<javadoc sourcepath="${source}" destdir="${doc}">
    <link href="http://java.sun.com/j2se/1.5.0/docs/api/" />
</javadoc>

And I'm getting this warning:

javadoc: warning - Error fetching URL: http://java.sun.com/j2se/1.5.0/docs/api/package-list

How do I get the javadoc to properly link to the API? I am behind a proxy.

From stackoverflow Rob Spieldenner

• You probably need the http.proxyHost and http.proxyPort system properties set. For example, ANT_OPTS="-Dhttp.proxyHost=proxy.y.com" ant doc

  Alternatively, you could set the "offline" flag and provide a package list, but that could be a pain for the Java core.

  From erickson

• You can also pass the arguments inside the ant task

  <arg value="-J-Dhttp.proxyHost=your.proxy.here"/>
  <arg value="-J-Dhttp.proxyPort=##"/>
  

  If going the offline link route. Download the package list by going to the URL of the Java API (http://java.sun.com/j2se/1.5.0/docs/api/package-list) and saving it as a text file and then using this Ant task.

  <javadoc sourcepath="${source}" destdir="${doc}">
      <link offline="true" href="http://java.sun.com/j2se/1.5.0/docs/api/" packagelistloc="path-containing-package-list"/>
  </javadoc>
  

  From Rob Spieldenner