title: Default connection pool for tomcat in spring-boot?
body: <p>What is the default value used for maximum connections on a <code>postgres</code> database with <code>tomcat</code> connection pooling using <code>spring-boot</code>?</p>
  
  <p>There is a property <code>spring.datasource.maxActive</code>, but when I try to sysout it, I'm getting an exception:</p>
  
  <pre><code>@Value("${spring.datasource.maxActive}")
  private String act;
  </code></pre>
  
  <p><code>java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.datasource.maxActive' in string value "${spring.datasource.maxActive}</code></p>