Apart from the usual web client interface, a EJB 3 application can be accessed also by a plain Java Standard Edition client. This post clarifies the use of Log4j in the latter form of client. To add the Log4j jar library, double click the project, so that the window of the image appears. As for web based (view) client J2EE projects you can read it
here:
All that 's written there is still valid. I would like to add a couple of things. First, you need to create the log4j.properties file in the following path:
C:\...\Model\src\
A copy of the log4j.properties file is given here for your convenience:
# **Set root logger level to DEBUG and its only appender to A.
log4j.rootLogger=DEBUG, A
# ***** A is set to be a ConsoleAppender.
log4j.appender.A=org.apache.log4j.ConsoleAppender
# ***** A uses PatternLayout.
log4j.appender.A.layout=org.apache.log4j.PatternLayout
log4j.appender.A.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
Secondly, when it comes to EJB model projects, you need to add the following code in
italics, in order to avoid the expensive use of System.out.println() in your client classes:
...
import org.apache.log4j.Logger;
public class PlaceOrderClient {
static Logger logger =Logger.getLogger("PlaceOrderClient");
/* instead of
Logger logger = Logger.getLogger(this.getClass().getSimpleName());*/
public static void main(String [] args) {
try {
final Context context = getInitialContext();
PlaceOrder placeOrder = (PlaceOrder)context.lookup("ejb3inaction-Model-PlaceOrder#actionbazaar.buslogic.PlaceOrder");
if (logger.isDebugEnabled())
logger.debug("Exercising PlaceOrder EJB...");
// System.out.println("Exercising PlaceOrder EJB...");
The full source code is available on OTN:
http://www.oracle.com/technetwork/indexes/samplecode/jdeveloper-adf-sample-522118.html
and is given without any guarantee of support whatsoever.
Finally, in case you prefer working with Eclipse, the process is quite similar. See for example:
http://snippets.dzone.com/posts/show/3248
If you need more tips about appenders:
http://www.mobilefish.com/developer/log4j/log4j_quickguide_appenders.html
https://logging.apache.org/log4j/2.x/
On the bright side, the text is well written, in American English, with a few spelling errors. It provides an introduction to PL/SQL, database design, Oracle Text for Oracle 9i, XML, including XSL, XPath and xsql, which is now considered obsolete(?). Its source code works and could be reused. On the dark side, the book is not an introductory level one, the chapters from the beginning to 14 are more reference like, until the true tutorial building of the web application begins. A javascript or java, introduction is missing, and the paragraphs about XPath are difficult to understand.
