title: Change to compiler 1.7 when creating a List produced errors throughout the entire project
body: <p>I am using Eclipse Juno and Java.</p>
  
  <p>I was trying to create a new list:</p>
  
  <pre><code>List myList = new ArrayList();
  </code></pre>
  
  <p>This had an error and the resolution on it was along the lines of change compiler to 1.7 which I accepted. The errror on this list creation line was corrected however I now have many errors thoughout the whole project on lines that were previously working. Some examples are:</p>
  
  <pre><code>class GetAccountAndCubsHandler&lt;T&gt; implements AsyncCallback&lt;List&lt;AccountAndCubs&gt;&gt;
  </code></pre>
  
  <p>Multiple markers at this line
   - The hierarchy of the type GetAccountAndCubsHandler is inconsistent
   - List cannot he resolved to a type</p>
  
  <pre><code>public class AccountCreationView extends Composite {
  </code></pre>
  
  <p>Multiple markers at this line
   - The hierarchy of the type AccountCreationView is inconsistent
   - Breakpoint:AccountCreationView</p>
  
  <pre><code>@SuppressWarnings("unused")
  private String accountId;
  </code></pre>
  
  <p>First line - Multiple markers at this line
   - SuppressWarnings cannot be resolved to a type
   - The attribute valie is undefined for the annotation type SuppressWarnings</p>
  
  <p>Second line - String cannot be resolved to a type</p>
  
  <p>As you can imagine having my whole project adversely affected in this way is very disconcerting so any advice on how to recover would be greatly appreciated.</p>
  
  <p>Regards,</p>
  
  <p>Glyn</p>