title: How to define a big string in Spring Roo annotation(or jpa annotation) entity, varchar(255) is not enough
body: <p>In spring-roo entity, I define a content field to record the content of the article:</p>
  
  <pre><code>@NotNull
  private String content;
  </code></pre>
  
  <p>But in mysql field, it mapped to varchar(255), it's too short to record a content of article so the following exception thrown:</p>
  
  <pre><code>ERROR org.hibernate.util.JDBCExceptionReporter - Data truncation: Data too long for column 'content' at row 1
  </code></pre>
  
  <p>My question is what's the big string field type in mysql? (In access db, it's "memo"), how to define this annotation in Spring Roo to make it record more data? Thanks</p>