title: Error installing juno eclipse
body: <p>Last week I downloaded the new version of Eclipse, juno version.
  I just tried to install Glassfish 3.1 and got the following error:</p>
  
  <pre><code>An error occurred while collecting items to be installed
  session context was: (profile = epp.package.jee, org.eclipse.equinox.internal.p2.engine.phases.Collect phase =, operand =, action =).
  Problems downloading artifact: osgi.bundle, oracle.eclipse.tools.doc.javaee5, 1.0.0.201201241920.
  MD5 hash is not as expected. Expected: 699d173f277d25db59d2b339a1e9098b and found 2887a201d2514c6b8322c5f630be0887.
  Problems downloading artifact: osgi.bundle, oracle.eclipse.tools.doc.javaee6, 1.0.0.201201241920.
  MD5 hash is not as expected. Expected: 089c09298729b38ac585f25f054477a5 and found 85033b5cbc613a8c6a5612c0cc91179b.
  Problems downloading artifact: osgi.bundle, oracle.eclipse.tools.glassfish, 5.0.1.201201241920.
  MD5 hash is not as expected. Expected: 26c38ca1a321d9b1b1ca3271d777ee75 and found 472830c9576aad4b375175bc39fa9d4e.
  Problems downloading artifact: org.eclipse.update.feature, oracle.eclipse.tools.juno.glassfish, 2.0.1.201201241920.
  MD5 hash is not as expected. Expected: fbef299b507f02fcab8887c108e82434 and found a10465b7694743e7df1fb779b38a7e3b.
  </code></pre>
  
  <p>What does this error mean? How do I fix it?</p>