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Merging a lot of different processes together into a single stateful session can result in many instance variables and lots of retained data And, if there are many different client instances executing concurrently, then there will be many, large retained instances using up a lot of server resources The effect will be severely degraded performance Another variation occurs when a number of stateless methods are included within a Stateful Session Bean If a lot of methods are thrown together into a few sessions, there is the likelihood that stateless (single-step) methods are implemented on Stateful Session Beans The result will be reduced performance, because the stateless methods aren t accessed through more scalable Stateless Session Beans Also, this means that the client always needs to get a handle to a specific Stateful Session Bean instance to execute any of those methods.

The acknowledgment statement for the page as forwarded by the bank s technical executive is as follows:

CONSUMER(Tc=3) = (item -> DELAY[i] 1 tick -> CONSUMER), DELAY~t:i .Tc] = (t==Tc) tick -> CONSUMER > (t<Tc) tick - DELAY[t+i]

Occasionally, a developer may define many variations on the same basic method, taking different numbers of parameters, and so on, resulting in a lot of very similarlooking methods that all support the same basic process When this is repeated for a.

private static String makeRow(String[] entries, int entryWidth) { String row = | ; for(int i=0; i<entries.length; i++) { row = row + padString(entries[i], entryWidth, ); row = row + | ; } return(row); } // A String of the form +------+------+------+ private static String makeSeparator(int entryWidth, int columnCount) { String entry = padString( , entryWidth+1, - ); String separator = + ; for(int i=0; i<columnCount; i++) { separator = separator + entry + + ; } return(separator); } private static String padString(String orig, int size, String padChar) { if (orig == null) { orig = <null> ; } // Use StringBuffer, not just repeated String concatenation // to avoid creating too many temporary Strings. StringBuffer buffer = new StringBuffer( ); int extraChars = size - orig.length(); for(int i=0; i<extraChars; i++) { buffer.append(padChar); } buffer.append(orig); return(buffer.toString()); } }

The solution Systemout Becomes assert is the best means to solve this pitfall (A related solution, assert the intent from Pitfall 11: No assert, can also be helpful) Tests trapped in this pitfall usually have the same issues that code trapped in Pitfall 11 do, namely the intent of the API is not asserted As you are working through this solution references will be made to the intent of the API being put into the asserts in places where the intent of the printout is not clear In those cases it might be helpful to refer back to that solution for more context The steps to that solution can be found earlier in this chapter as the solution to Pitfall 11 Many developers become console blind because of having too many debugging statements in their code.

13: Interacting with XML Using JDOM In addition to the abstract class AbstractDOMAdapter, which implements the DOMAdapter interface, seven concrete implementations currently extend AbstractDOMAdapter. These wrap the behavior for getting a DOM Document object from your favorite DOM parser. The currently included implementations are CrimsonDOMAdapter, JAXPDOMAdapter, OracleV1DOMAdapter, OracleV2DOMAdapter, ProjectXDOMAdapter, XercesDOMAdapter, and XML4JDOMAdapter. Using your bare hands If you are creating a JDOM Document from scratch then you aren't reading from input, so your answer isn't found within the org.jdom.input package. Create a new instance of the class org.jdom.Document using one of the five constructors. At the very least you should specify the root element. You can, for example, create Richard IV with the following:

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As the program runs, debugging statements come spraying out of the console as fast as the console can write text The same thing happens with test code that is stuck in this pitfall As the printouts come streaming by on the console, the developer is forced to pay very close attention and then must be able to look through all the output to make sure that what was expected is what actually happened There is no way that a developer will catch everything in a long stream of printouts, and a developer cannot possibly provide as much detail checking as a program can With asserts in place, however, the test can actually make sure that whatever is being looked for in the output is found And, as an added bonus, nothing will show up on the console unless there is a failure.