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  • How does this code break the Law of Demeter?

    - by Dave Jarvis
    The following code breaks the Law of Demeter: public class Student extends Person { private Grades grades; public Student() { } /** Must never return null; throw an appropriately named exception, instead. */ private synchronized Grades getGrades() throws GradesException { if( this.grades == null ) { this.grades = createGrades(); } return this.grades; } /** Create a new instance of grades for this student. */ protected Grades createGrades() throws GradesException { // Reads the grades from the database, if needed. // return new Grades(); } /** Answers if this student was graded by a teacher with the given name. */ public boolean isTeacher( int year, String name ) throws GradesException, TeacherException { // The method only knows about Teacher instances. // return getTeacher( year ).nameEquals( name ); } private Grades getGradesForYear( int year ) throws GradesException { // The method only knows about Grades instances. // return getGrades().getForYear( year ); } private Teacher getTeacher( int year ) throws GradesException, TeacherException { // This method knows about Grades and Teacher instances. A mistake? // return getGradesForYear( year ).getTeacher(); } } public class Teacher extends Person { public Teacher() { } /** * This method will take into consideration first name, * last name, middle initial, case sensitivity, and * eventually it could answer true to wild cards and * regular expressions. */ public boolean nameEquals( String name ) { return getName().equalsIgnoreCase( name ); } /** Never returns null. */ private synchronized String getName() { if( this.name == null ) { this.name == ""; } return this.name; } } Questions How is the LoD broken? Where is the code breaking the LoD? How should the code be written to uphold the LoD?

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  • Debugging JSR 168 Portlet with spring, eclipse & pluto.

    - by mikep
    I am trying to set up a development environment to test Spring Portlet MVC for development of JSR 168 conforming portlets. I have the latest STS installed, which included Spring 2.5 and Eclipse (Catalina). This has been my environment to develop with Spring MVC, and that works fine using Apache as a local server for debugging. I found some instructions on the Pluto portal site on using Pluto as a remote debugging host for portlets. I have implemented those instructions. I am sending Eclipse into debug mode by right clicking on one of the JSPs and going into "debug as". My problem is that when I log into Pluto, it is not sending me into debug mode. I am seeing the default Pluto page as opposed to my portlet. My portlet has not been installed onto Pluto, and the instructions do not seem to require the portlet to be installed. To help, I have a screen shot at http://www.ceruleaninc.ca/pluto%5Fproblem.jpg, showing the following: Eclipse showing the remote debugging to localhost:8000 Tomcat showing the "Listening for transport dt_socket at address: 8000 The Catalina.bat jpda start command The Pluto Portal screen after log in Thanks much! I would welcome any advice on approaches to debugging portlets. I am not tied to pluto. There does seem to be a lack of detailed instructions on this topic.

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  • Algorithm to aggregate values from child tree nodes

    - by user222164
    I have objects in a tree structure, I would like to aggregate status information from children nodes and update parent node with aggregated status. Lets say node A has children B1, B2, and B1 has C1, C2, C3 as children. Each of the nodes have a status attribute. Now if C1, C2, C3 are all complete then I would like to mark B1 as completed. And if C4, C5,C6,C7 are complete make B2 as complete. When B1 and B2 are both complete mark A as complete. I can go through these nodes in brute force method and make updates, could someone suggest an efficient algorithm to do it. A { B1 { C1, C2, C3}, B2 { C4, C5, C6, C7} }

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  • How can I set size of a button?

    - by Roman
    I put my buttons in a JPane with GridLayout. Then I put JPanel into another JPanel with BoxLayout.Y_AXIS. I want buttons in the GridLayout to be square. I use tmp.setSize(30,30) and it does not work. I also try to use new GridLayout(X, Y, 4, 4) but I cannot figure out what X and Y are. So, what is the correct way to do this stuff?

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  • how to Update JTable

    - by bob3333
    Good evening I have a JTable that I built with a TableModel how to update the elements of the table, because when I do table = new JTable (new TableProg (elementTab)) I create another table above the original table and it is very ugly So for example how to update element of table in a loop at each iteration as "elementTab" changes? thank you very much

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  • How to keep the session of user login?

    - by YaW
    Hi, I have an app that requires user to register. I've got the app conected to PHP in my server to do the logic of register/login and so, this is not problem at all. But, I want to keep a session of the user in local, so the user doesn't have to login again every time he runs the app. So, I want something like this: First time user, he opens the app, register and login. Do some stuff with the app and closes it. Open the app again, the user is recognized so he doesn't need to login again. I only need to store an ID and a Username (both fetched from the DB in the login php method). What's the best way to do this?? I've thought about doing a custom preference, store the data in files or even a local DB (sqlite). Any suggestions?

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  • Parsing xml with dom4j or jdom or anyhow

    - by c0mrade
    Hello, I wanna read feed entries and I'm just stuck now. Take this for example : http://stackoverflow.com/feeds/question/2084883 lets say I wanna read all the summary node value inside each entry node in document. How do I do that? I've changed many variations of code this one is closest to what I want to achieve I think : Element entryPoint = document.getRootElement(); Element elem; for(Iterator iter = entryPoint.elements().iterator(); iter.hasNext();){ elem = (Element)iter.next(); System.out.println(elem.getName()); } It goes trough all nodes in xml file and writes their name. Now what I wanted to do next is if(elem.getName() == "entry") to get only the entry nodes, how do I get elements of the entry nodes, and how to get let say summary and its value? tnx

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  • t:commandSortHeader not being styled

    - by JBristow
    I've got the following JSF: <t:column styleClass="cb-status-column"> <f:facet name="header"> <t:commandSortHeader columnName="externalStatus" styleClass="cb-status-column"> Status </t:commandSortHeader> </f:facet> <h:outputText value="#{tx.externalStatus}" title="#{tx.externalStatus}"/> </t:column> Unfortunately, it renders like this: <th> <a href="#" onclick="return oamSubmitForm('transactionsTableForm','cb-activity-table:j_id131');" id="cb-activity-table:j_id131"> Status </a> </th> How do I get it to look like this: <th class="cb-status-column"> <a href="#" onclick="return oamSubmitForm('transactionsTableForm','cb-activity-table:j_id131');" id="cb-activity-table:j_id131"> Status </a> </th>

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  • Ghost activity in android

    - by Ari
    My application works as follow: On start I have some AppStartActivity which does something, finishes itself and starts MainActivity if user is logged in or LoginActivity otherwise. LoginActivity finishes itself and starts MainActivity when user log in successfully. On MainActivity I have SomeActivity from which user can logout. Activity stack for this situation is MainActivity > SomeActivity. It is correct, back button works well. When user click LogOut button there is a problem. I need to show LoginActivity but I don't want to have MainActivity and SomeActivity on activity stack anymore. I could resolve this problem if I wouldn't finish AppStartActivity. I could go back then with flag FLAG_ACTIVITY_CLEAR_TOP and it would work well. But here is a problem with back button. I don't want user to come back to this activity with back button. I want it to exit app instead. UPDATED: Flags FLAG_ACTIVITY_NEW_TASK and FLAG_ACTIVITY_CLEAR_TASK would be best, but I need it working in API level 9.

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  • Tomcat Compression Does Not Add a Content-Encoding: gzip in the Header

    - by Julien Chastang
    I am using Tomcat to compress my HTML content like this: <Connector port="8080" maxHttpHeaderSize="8192" maxProcessors="150" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="150" connectionTimeout="20000" disableUploadTimeout="true" compression="on" compressionMinSize="128" noCompressionUserAgents="gozilla, traviata" compressableMimeType="text/html" URIEncoding="UTF-8" /> In the HTTP header (as observed via YSlow), however, I am not seeing Content-Encoding: gzip resulting in a poor YSlow score. All I see is HeadersPost Response Headers Server: Apache-Coyote/1.1 Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Content-Length: 5251 Date: Sat, 14 Feb 2009 23:33:51 GMT I am running an apache mod_jk Tomcat configuration. How do I compress HTML content with Tomcat, and also have it add "Content-Encoding: gzip" in the header?

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  • Tomcat cache filter

    - by mabuzer
    How to have resource handler in tomcat, which simply check resource like js or css and append an ?[last-modified-date] to it's url, so we enable cache, and be sure that client-browser use right resource? thanks in advance...

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  • How to make a try-catch block that iterates through all objects of a list and keeps on calling a met

    - by aperson
    Basically iterating through a list and, - Invoke method on first object - Catch first exception (if any); if there are no more exceptions to catch, return normally. Otherwise, keep on invoking method until all exceptions are caught. - Move on to next object. I can iterate through each object, invoke the method, and catch one exception but I do not know how to continuously invoke the method on it and keep on catching exceptions :S Thanks :)

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  • Database connection timeout

    - by Clinton Bosch
    Hi I have read so many articles on the Internet about this problem but none seem to have a clear solution. Please could someone give me a definite answer as to why I am getting database timeouts. The app is a GWT app that is being hosted on a Tomcat 5.5 server. I use spring and the session factory is created in the applicationContext.xml as follows <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">${connection.dialect}</prop> <prop key="hibernate.connection.username">${connection.username}</prop> <prop key="hibernate.connection.password">${connection.password}</prop> <prop key="hibernate.connection.url">${connection.url}</prop> <prop key="hibernate.connection.driver_class">${connection.driver.class}</prop> <prop key="hibernate.show_sql">${show.sql}</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.c3p0.min_size">5</prop> <prop key="hibernate.c3p0.max_size">20</prop> <prop key="hibernate.c3p0.timeout">1800</prop> <prop key="hibernate.c3p0.max_statements">50</prop> <prop key="hibernate.c3p0.idle_test_period">300</prop> </props> </property> <property name="annotatedClasses"> <list> <value>za.co.xxxx.traintrack.server.model.Answer</value> <value>za.co.xxxx.traintrack.server.model.Company</value> <value>za.co.xxxx.traintrack.server.model.CompanyRegion</value> <value>za.co.xxxx.traintrack.server.model.Merchant</value> <value>za.co.xxxx.traintrack.server.model.Module</value> <value>za.co.xxxx.traintrack.server.model.Question</value> <value>za.co.xxxx.traintrack.server.model.User</value> <value>za.co.xxxx.traintrack.server.model.CompletedModule</value> </list> </property> </bean> <bean id="dao" class="za.co.xxxx.traintrack.server.DAO"> <property name="sessionFactory" ref="sessionFactory"/> <property name="adminUsername" value="${admin.user.name}"/> <property name="adminPassword" value="${admin.user.password}"/> <property name="godUsername" value="${god.user.name}"/> <property name="godPassword" value="${god.user.password}"/> </bean> All works fine untile the next day: INFO | jvm 1 | 2010/06/15 14:42:27 | 2010-06-15 18:42:27,804 WARN [JDBCExceptionReporter] : SQL Error: 0, SQLState: 08S01 INFO | jvm 1 | 2010/06/15 14:42:27 | 2010-06-15 18:42:27,821 ERROR [JDBCExceptionReporter] : The last packet successfully received from the server was 38729 seconds ago.The last packet sent successfully to the server was 38729 seconds ago, which is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. INFO | jvm 1 | 2010/06/15 14:42:27 | Jun 15, 2010 6:42:27 PM org.apache.catalina.core.ApplicationContext log INFO | jvm 1 | 2010/06/15 14:42:27 | SEVERE: Exception while dispatching incoming RPC call I have read so many different things (none of which worked), please help

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  • httponly cookie support in Apache HttpClient

    - by techzen
    Can anyone confirm if the latest release of Apache httpClient 4.0.1 or 4.1 alpha2 supports httpOnly cookie. (Did not find anything in the release notes but the source code validation for cookies does not raise exception when value is not existing?) Since the previous versions raise an exception on trying to parse HttpOnly stating that no value was found.

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  • Is using the Class instance as a Map key a best practice?

    - by Pangea
    I have read somewhere that using the class instances as below is not a good idea as they might cause memory leaks. Can someone tell me if if that is a valid statement? Or are they any problems using it this way? Map<Class<?>,String> classToInstance=new HashMap(); classToInstanceMap.put(String.class,"Test obj");

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  • Handling connection errors in a MDB

    - by Rafa de Castro
    Is it possible to manage connection timeouts or errors in a MessageDrivenBean? You can make the factory to retry connecting a certain number of times but... is it possible to make some actions each time that a reconnection retrial is neccesary? Is it possible to register an ExceptionListener into the MessageDrivenBean's connection somehow? Thanks a lot.

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  • Exception thrown while working with JTabbedPane

    - by Halo
    I'm using a JTabbedPane in my application and I listen to its changes with ChangeListener so that I can know which tab is currently selected. So my stateChanged method is; public void stateChanged(ChangeEvent e) { currentPageIndex = jTabbedPane.getSelectedIndex(); } But while I'm adding new tabs to the JTabbedPane it throws an ArrayIndexOutOfBoundsException in the method above, I don't know why. Some suggested for a similar case that this is a bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4873983, but as you'll see some says the solution is to work with Swing from EventDispatchThread. What does it mean, do they mean the SwingUtilities.invokeLater thing? Can someone show me how I can modify my stateChanged method accordingly to avoid the exception?

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  • Programatically setting castor properites in version 1.3

    - by Dinuk
    Hello, I am trying to programmatically set the org.exolab.castor.indent property when marshalling some objects - however, contrary to the documentation published, the class org.exolab.castor.util.LocalConfiguration does not seem to be shipped with the 1.3 release. Currently, I have specified the castor.properties file on the classpath, which is picking up the properties I want to set, but I would rather reduce this deployment overhead, as my indentation requirement is not likely to change. Any advice would be greatly appreciated.

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  • Notification doesn't play sound or show lights even though set to

    - by robintw
    In my android application I have the following code: Notification notification = new Notification(icon, tickerText, when); context = context.getApplicationContext(); CharSequence contentTitle = "UK Radio Guide"; CharSequence contentText = title + " on " + channel_id + " at " + start; Intent notificationIntent = new Intent(context, ViewSchedules.class); PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0); notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent); notification.ledARGB = 0xff00ff00; notification.ledOnMS = 300; notification.ledOffMS = 1000; notification.flags |= Notification.FLAG_SHOW_LIGHTS; notification.sound = Uri.parse("android.resource://com.robinwilson.radioguide/" +R.raw.chimes); notification.vibrate = new long[] { 0, 300, 200, 300, 400, 300 }; // Actually send the notification nm.notify(0, notification); As far as I am aware, I have followed the steps in the documentation to set it to play a sound from the resources folder, and to flash the lights. However, neither of these happen. It does, however, vibrate, as instructed. Any ideas what I'm doing wrong here? I've looked through the permissions that I can give the app in the AndroidManifest.xml file, but I can't see one for letting it flash the light or make sounds.

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  • Spring/Hibernate/Junit example of testing DAO against HSQLDB

    - by Ryan P.
    Hi guys, I'm working on trying to implement a JUnit test to check the functionality of a DAO. (The DAO will create/read a basic object/table relationship in HSQLDB). The trouble I'm having is the persistence of the DAO (for the non-test code) is being completed through an in-house solution using Spring/Hibernate, which eliminates the usual *.hbm.xml templates that most examples I have found contain. Beacuse of this, I'm having some trouble understanding how to setup a JUnit test to implement the DAO to create/read (just very basic funtionality) to an in-memory HSQLDB. I have found a few examples, but the usage of the in-house persistence means I can't extend some of the classes the examples show (I can't seem to get the application-context.xml setup properly). Can anyone suggest any projects/examples I could take a look at (or any documentation) to further my understanding of the best way to implement this test functionality? I feel like this should be really simple, but I keep running into problems implementing the examples I have found. Thanks in advance!

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  • Merging columns in a JTable

    - by Harish
    I am working in JTable and I have a requirement like this. Say There are 4 columns namely 10,20,30,40 Now the value usually comes like 10-20 20-30 and 30-40 So it was easy for us to display the name for this range. But recently the values have started to come randomly like 15-25 10-25,25-30 In this case our JTable should dynamically adjust the size of the row such that it represents that range only meaning it should not disturb the existing cells and only rows which diverge from the normal range. TO be more precise I should be able to merge and split cells based on the content of the cell.

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  • HttpURLConnection: What's the deal with having to read the whole response?

    - by stormin986
    My current problem is very similar to this one. I have a downloadFile(URL) function that creates a new HttpURLConnection, opens it, reads it, returns the results. When I call this function on the same URL multiple times, the second time around it almost always returns a response code of -1 (But throws no exception!!!). The top answer in that question is very helpful, but there are a few things I'm trying to understand. So, if setting http.keepAlive to false solves the problem, it indicates what exactly? That the server is responding in a way that violates the http protocol? Or more likely, my code is violating the protocol in some way? What will the trace tell me? What should I look for? And what's the deal with this: You need to read everything from error stream. Otherwise, it's going to confuse next connection and that's the cause of -1. Does this mean if the response is some type of error (which would be what response code(s)?), the stream HAS to be fully read? Also, every time I am attempting an http request I am basically creating a new connection, and then disconnect()ing it at the end. However, in my case I'm not getting a 401 or whatever. It's always a 200. But my second connection almost always fails. Does this mean there's some other data I should be reading that I'm not (in a similar manner that the error stream must be fully read)? Please help shed some light on this? I feel like there's some fundamental http protocol understanding I'm missing.

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