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java Programming Glossary: shouldWhy JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times invoking a getter method is a very cheap operation so you should generally not worry about this at all. However the story changes.. re executed everytime Getter methods in JSF backing beans should be designed that way that they solely return the already prepared.. more exactly as per the Javabeans specification . They should not do any expensive DB business logic at all. For that the..
How to upload files to server using JSP/Servlet? http://stackoverflow.com/questions/2422468/how-to-upload-files-to-server-using-jsp-servlet work which requires precise knowledge of RFC2388 . You shouldn't try to do this on your own or copypaste some homegrown library.. as roseindia.net. See also uploading of pdf file . You should rather use a real library which is used and implicitly tested..
Overriding equals and hashCode in Java http://stackoverflow.com/questions/27581/overriding-equals-and-hashcode-in-java as b.hashCode . In practice If you override one then you should override the other. Use the same set of fields that you use..
How to use java.net.URLConnection to fire and handle HTTP requests? http://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests response connection.getInputStream ... Any query string should be concatenated to the URL using . The Accept Charset header..
GUI not working after rewriting to MVC http://stackoverflow.com/questions/3066590/gui-not-working-after-rewriting-to-mvc view controller files and when I click on empty Pin that should be updated and repainted with new color noting happens. Can..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading said your major concern is possibly threadsafety . You should now have learnt that Servlets and filters are shared among all.. too expensive to recreate it on every request. But you should also realize that you should never assign any request or session.. it on every request. But you should also realize that you should never assign any request or session scoped data as an instance..
How to avoid Java Code in JSP-Files? http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files presentation tier from the business logic JSP scriptlets should not be used for writing business logic. Rather JSP scriptlets..
JSTL in JSF2 Facelets… makes sense? http://stackoverflow.com/questions/3342984/jstl-in-jsf2-facelets-makes-sense or submitted form values in the model. JSTL tags should be used carefully in Mojarra versions older than 2.1.18. Before..
How to choose the right bean scope? http://stackoverflow.com/questions/7031885/how-to-choose-the-right-bean-scope unnecessarily occupies server memory. Note that the scope should rather not be chosen based on performance implications unless..
Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing? http://stackoverflow.com/questions/7229226/should-i-avoid-the-use-of-setpreferredmaximumminimumsize-methods-in-java-swi The methods have been defined for a reason. So when should I use them In which context For what purposes What exactly are.. proportions between children of a Component eg child1 should use 10 of space child2 40 child3 50 is it possible to achieve.. code The methods have been defined for a reason. So when should I use them In which context For what purposes don't know personally..
Java String.equals versus == [duplicate] http://stackoverflow.com/questions/767372/java-string-equals-versus that's guaranteed non null in your code although you should still check that you've actually got some tokens in the datos..
Unsupported major.minor version 51.0 http://stackoverflow.com/questions/10382929/unsupported-major-minor-version-51-0 version of Java may be old or too new. How do I fix it Should I install JDK and setup my path variable to JDK instead of JRE..
Why is the Java main method static? http://stackoverflow.com/questions/146576/why-is-the-java-main-method-static protected JavaClass int x public void main String args Should the JVM call new JavaClass int What should it pass for x If..
Floating point arithmetic not producing exact results in Java http://stackoverflow.com/questions/1661273/floating-point-arithmetic-not-producing-exact-results-in-java . Then read What Every Computer Scientist Should Know About Floating Point Arithmetic for the background of why..
What to learn for making Java web applications in Java EE 6? [closed] http://stackoverflow.com/questions/1960280/what-to-learn-for-making-java-web-applications-in-java-ee-6 anyone please tell me how I should proceed with learning Should I grab a book like this Beginning Java EE 6 Platform with GlassFish..
Best Practice: Initialize class fields in constructor or at declaration? http://stackoverflow.com/questions/24551/best-practice-initialize-class-fields-in-constructor-or-at-declaration concerning when you should initialize your classes fields Should you do it at declaration public class Die private int topFace..
What is a raw type and why shouldn't we use it? http://stackoverflow.com/questions/2770321/what-is-a-raw-type-and-why-shouldnt-we-use-it can't use raw types and how is it better Similar questions Should Java Raw Types be Deprecated java generics raw types share..
Is it possible to use JSF+Facelets with HTML 4/5? http://stackoverflow.com/questions/2935759/is-it-possible-to-use-jsffacelets-with-html-4-5
How do I programmatically compile and instantiate a Java class? http://stackoverflow.com/questions/2946338/how-do-i-programmatically-compile-and-instantiate-a-java-class .toURL Class cls Class.forName test.Test true classLoader Should print hello . Object instance cls.newInstance Should print world.. Should print hello . Object instance cls.newInstance Should print world . System.out.println instance Should print test.Test@hashcode.. Should print world . System.out.println instance Should print test.Test@hashcode . Which yields like hello world test.Test@ab853b..
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications choose how you choose the responsibility of a servlet. Should we have one Servlet per entity which will process all it's options..
If profiler is not the answer, what other choices do we have? http://stackoverflow.com/questions/4387895/if-profiler-is-not-the-answer-what-other-choices-do-we-have But then what is the alternative of using profilers. Should we go back and just use our feeling to do optimization UPDATE..
How do I write a correct micro-benchmark in Java? http://stackoverflow.com/questions/504103/how-do-i-write-a-correct-micro-benchmark-in-java illustrating various things to think about. Example Should the benchmark measure time iteration or iterations time and..
Are getters and setters poor design? [closed] http://stackoverflow.com/questions/565095/are-getters-and-setters-poor-design and great programs. What are your opinions on this Should I be changing my Getters and Setters for my private variables..
Java: checked vs unchecked exception explanation http://stackoverflow.com/questions/6115896/java-checked-vs-unchecked-exception-explanation catch FileNotFoundException e 3. What should I do here Should I throw new FileNotFoundException File not found Should I log.. Should I throw new FileNotFoundException File not found Should I log Or should I System.exit 0 4. Now couldnt the above code.. Isn't handling the error sooner better Why bubble up EDIT Should I bubble up the exact exception or mask it using Exception Below..
Array or List in Java. Which is faster? http://stackoverflow.com/questions/716597/array-or-list-in-java-which-is-faster of strings in memory to be accessed serially in Java. Should I store them in an array or should I use some kind of List Since..
Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing? http://stackoverflow.com/questions/7229226/should-i-avoid-the-use-of-setpreferredmaximumminimumsize-methods-in-java-swi I avoid the use of set Preferred Maximum Minimum Size methods.. analysis of the subject. So I have the following questions Should I completely avoid the use of those methods The methods have.. java swing layout manager share improve this question Should I completely avoid the use of those methods yes for application..
Efficiency of Java “Double Brace Initialization”? http://stackoverflow.com/questions/924285/efficiency-of-java-double-brace-initialization scope . Main question Is this as inefficient as it sounds Should its use be limited to one off initializations And of course..
http://stackoverflow.com/questions/1111130/basic-file-upload-in-gwt form.setMethod FormPanel.METHOD_POST form.setAction WHAT SHOULD I PUT HERE VerticalPanel holder new VerticalPanel fu.setName..
JBoss: WAR file in EAR can't find JAR library on classpath http://stackoverflow.com/questions/1330067/jboss-war-file-in-ear-cant-find-jar-library-on-classpath weblogic deployment to Jboss. So if there is anything that SHOULD work but doesn't it might be an issue with some of the code..
How to run Spring 3.0 PetClinic in tomcat with Hibernate backed JPA http://stackoverflow.com/questions/2536292/how-to-run-spring-3-0-petclinic-in-tomcat-with-hibernate-backed-jpa COMMENT the context load time weaver load time weaver SHOULD NOT be used with Hibernate this is for Toplink Declare Hibernate..
http://stackoverflow.com/questions/3813941/mapping-same-class-relation insert false update false list index column WHICH COLUMN SHOULD BE USED AS INDEX one to many class MyFriends list class hibernate..
Thread interrupt not ending blocking call on input stream read http://stackoverflow.com/questions/3843363/thread-interrupt-not-ending-blocking-call-on-input-stream-read this code I never get a ClosedByInterruptException which SHOULD fire once the input stream closes. Furthermore the execution..
Writing an authorization filter for my web app(JSF 2.0) http://stackoverflow.com/questions/5662367/writing-an-authorization-filter-for-my-web-appjsf-2-0 Only SELLER adminpanel.xhtml Only ADMINISTRATOR HOW SHOULD I IMPLEMENT THAT if currentUser null currentUser.getType .equals.. page administrator access THE REGISTRATION PAGES SHOULD NOT BE ACCESSIBLE IF THE USER IS LOGGED IN I read the file from..
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000? http://stackoverflow.com/questions/8763497/how-to-drive-c-c-or-java-compiler-to-compute-123-1000 asked here . In addition It should be noted that the sum SHOULD be calculated during compilation. Printing just the result using..
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