Question

I want to get tomcat’s installation directory in my computer using java. I tried using :

System.getProperty("catalina.base");

and

System.getProperty("catalina.home");

But both methods return null as the answer. I tried it with System.getProperty("java.home"); and it correctly returns the java path.
Any ideas as to what the problem is? Thanks

Answer 1

Try installing this JSP and passing various values for the “property” parameter:

<%
  String propertyName = request.getParameter("property");
  Object propertyValue;
  String typeString;
  if(null == propertyName)
    propertyValue = null;
  else
    propertyValue = System.getProperty(propertyName);

  if(null == propertyValue)
    typeString = "null";
  else
    typeString = propertyValue.getClass().getName();
%>
The system property <code><%= propertyName %></code> has the value:
<code><%= propertyValue %></code> (<%= typeString %>).

Maybe you can find a pattern to which property values return null.