Run Into Problem When Trying Not To Hard Code the Host Name

Question

My code (using the JavaMail API) works fine when the SMTP host name is hard coded in the program:
       props.put( "mail.smtp.host", "TheHostName" );Then, I tried to put the host name in a properties file (smtpServer.properties). The properties file is in the $TOMCATHOME\webapps\AppName\WEB-INF\classes\resources directory. And the properties file has this one single line:
smtpServer = TheHostName     //Note: The host name has only alpha characters, dots, and dashesIn my program, I did:
   private final String PROPFILE = "resources/smtpServer.properties";
   private Properties oProp = null;
   public SendBatchMails()  // this is the constructor in my class
      try
         oProp = new Properties();
         oProp.load ( getClass().getClassLoader().getResourceAsStream( PROPFILE ) );
      catch( IOException oEx )
         System.out.println("Unable to load the Properties " + PROPFILE + oEx );
       String smtpServer = oProp.getProperty( "smtpServer" );
       Properties props = System.getProperties();
       props.put( "mail.smtp.host", smtpServer );And, I got this runtime error:
java.lang.IllegalArgumentException: argument type mismatch
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:324)
     org.apache.commons.beanutils.PropertyUtils.setSimpleProperty(PropertyUtils.java:1789)
     org.apache.commons.beanutils.PropertyUtils.setNestedProperty(PropertyUtils.java:1684)
     org.apache.commons.beanutils.PropertyUtils.setProperty(PropertyUtils.java:1713)
     org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:1019)
     org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
     org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1252)
     org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:821)
     org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
     org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Answer 1

I would agree with Reply 1. From the stack trace it is apparent that it comes from Struts, where it is failing to set some kind of property in a bean. However the code that you posted doesn't seem to have anything to do with that. Check your Struts configuration.