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  • Throw a long list of exceptions vs throw an Exception vs throw custom exception?

    - by athena
    I have an application which uses two methods of an API. Both these methods throw more than five exceptions each. So, if I just add a throws declaration then it becomes a list of more than ten. (My method cannot handle any of the ten exceptions) I have read that throwing a long list of exceptions is a bad practice. Also throwing (the umbrella) Exception is a bad practice. So, what should I do? Add a try catch block, and log and exit in the catch block? (Current approach) Create a custom exception class, wrap every exception and throw the custom exception? Add a throws declaration for all exceptions? Throw Exception?

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  • Android - Start service on boot

    - by Gady
    From everything I've seen on Stack Exchange and elsewhere, I have everything set up correctly to start an IntentService when Android OS boots. Unfortunately it is not starting on boot, and I'm not getting any errors. Maybe the experts can help... Manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.phx.batterylogger" android:versionCode="1" android:versionName="1.0" android:installLocation="internalOnly"> <uses-sdk android:minSdkVersion="8" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.BATTERY_STATS" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <service android:name=".BatteryLogger"/> <receiver android:name=".StartupIntentReceiver"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> </application> </manifest> BroadcastReceiver for Startup: package com.phx.batterylogger; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; public class StartupIntentReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Intent serviceIntent = new Intent(context, BatteryLogger.class); context.startService(serviceIntent); } } UPDATE: I tried just about all of the suggestions below, and I added logging such as Log.v("BatteryLogger", "Got to onReceive, about to start service"); to the onReceive handler of the StartupIntentReceiver, and nothing is ever logged. So it isn't even making it to the BroadcastReceiver. I think I'm deploying the APK and testing correctly, just running Debug in Eclipse and the console says it successfully installs it to my Xoom tablet at \BatteryLogger\bin\BatteryLogger.apk. Then to test, I reboot the tablet and then look at the logs in DDMS and check the Running Services in the OS settings. Does this all sound correct, or am I missing something? Again, any help is much appreciated.

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  • How do I properly display all content in a JTabbedPane?

    - by maleki
    I am nesting a JPanel inside a JTabbedPane. I am having trouble displaying all the content inside of the JTabbedPane. The outside borders of the internal content get chopped off. I am currently not using a Layout Manager for my JTabbedPane or dummy Panel because it stretches my content automatically. How do I add a JPanel inside the JTabbedPane so that I can have an even border around all the content.My attempts to create a dummy panel and setting a border for the inner panel using BorderFactory haven't worked. Is there a convention that I need to know to do this correctly? JTabbedPane tabPane = new JTabbedPane(); GridPane tab1 = new GridPane(); GridPane tab2 = new GridPane(); tabPane.add("My Pieces",tab1); tabPane.add("Opponent Pieces",tab2); public class GridPane extends JPanel { public GridPane() { this.setPreferredSize(new Dimension(400,160)); this.setLayout(new GridLayout(4,10)); this.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT); for (int i = 0; i < 4; i++) { for (int j = 0; j < 10; j++) { boardSquares[i][j] = new JPanel(); boardSquaresArr.add(boardSquares[i][j]); this.add(boardSquares[i][j]); } } } }

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  • Formatted HTML as output from method invocation from JMX HTTP page

    - by Dutch
    Hi, Is there a way to return HTML from a method which gets called from the JMX HTTP page. I have a huge set of data and want to display the data with some formatting. The following code does not work: @ManagedOperation(description = "return html") @ManagedOperationParameters({@ManagedOperationParameter(name = "someVal", description = "text")}) public List returnAsHtml(String someVal) { return ""+someValblah"; } Looks like JMX escapes the returned script before throwing it to the browser.

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  • How to get distinct results in hibernate with joins and row-based limiting?

    - by Daniel Alexiuc
    I'm trying to implement paging using row-based limiting (for example: setFirstResult(5) and setMaxResults(10)) on a Hibernate Criteria query that has joins to other tables. Understandably, data is getting cut off randomly; and the reason for that is explained here. As a solution, the page suggests using a "second sql select" instead of a join. How can I convert my existing criteria query (which has joins using createAlias()) to use a nested select instead?

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  • JXMapViewer change orientation to Heading Up

    - by Charlie
    I am trying to use JXMapViewer (from swingx-ws) with Open Street Maps. I was wondering if it would be possible to display the map tiles in the JXMapViewer based on heading up, rather than on North up. For example, the normal car GPS navigation systems let you do that. I've looked through the documentation and there doesn't seem to be a straightforward way to do this. Is there something else that accomplish this, besides JXMapViewer?

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  • How to upload images to appengine from gwt

    - by user356083
    Related question I am having similar problems to what that guy had in his. My upload server returns aredirect Specifically, I am not sure what FormPanel.SubmitCompleteEvent.getResults() returns. Sometimes, I get html of an img: <img style="cursor: -moz-zoom-in;" alt="http://<myapp>.appspot.com/servePic?blob-key=abcdef" src="http://<myapp>.appspot.com/servePic?blob-abcdef" height="1" width="1"> Sometimes I get the image data in bytes. Behavior varies on I dunno what. I get the first in development, and the second in production. Does anyone know anything about this?

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  • Auto-creating User details with Grails and LDAP

    - by Benny Hallett
    I'm using the Acegi Security plugin for Grails, and authentication via LDAP. The application logs show that on login, we can authenticate the user and get their roles via LDAP, but the login fails because the User Details cannot be found in the application's database. Is there a way to auto create and save a basic User Details domain object if one doesn't already exit?

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  • How to avoid having very large objects with Domain Driven Design

    - by Pablojim
    We are following Domain Driven Design for the implementation of a large website. However by putting the behaviour on the domain objects we are ending up with some very large classes. For example on our WebsiteUser object, we have many many methods - e.g. dealing with passwords, order history, refunds, customer segmentation. All of these methods are directly related to the user. Many of these methods delegate internally to other child object but this still results in some very large classes. I'm keen to avoid exposing lots of child objects e.g. user.getOrderHistory().getLatestOrder(). What other strategies can be used to avoid this problems?

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  • Preferred way of application initialization

    - by lisak
    Do you guys have your own little framework for project startups ? I mean, every time one needs to do the same things at the beginning: Context initialization - ideally after arguments are processed. Sometimes without interactive user input, sometimes with input reader. Sometimes we need to load properties, sometimes not. Then we need to get a class out of context and run its method. Programming....programming until writing shell script to place everything on classpath. It's true that it differs according to the actual needs. But it seems to me, that I'm doing always almost the same, again and again from the scratch. Sometimes I realize that I'm postponing my work just because I don't want to do these annoying startups. It would be great if there was some kind of universal Main class doing reflection to specified bean, context initialization, argument parsing, interactive user input reading and have the programmer do the important things...All setup might be done via spring configuration. I think I'll have to do it by myself. I'd appreciate your ideas

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  • Do we need HyperJAXB generated hashCode & equals methods?

    - by Marcus
    We've generated some (well a lot) of classes using HyperJAXB. All of the classes implement Equals and HashCode and have the implementation style below. Appears this code is never executed.. is there any particular reason we need this code? I'm looking to simplify the classes if we can. public boolean equals(Object object) { if (!(object instanceof MyClass)) { return false; } if (this == object) { return true; } final EqualsBuilder equalsBuilder = new JAXBEqualsBuilder(); equals(object, equalsBuilder); return equalsBuilder.isEquals(); } public void hashCode(HashCodeBuilder hashCodeBuilder) { hashCodeBuilder.append(this.getValue()); hashCodeBuilder.append(this.getId()); } public int hashCode() { final HashCodeBuilder hashCodeBuilder = new JAXBHashCodeBuilder(); hashCode(hashCodeBuilder); return hashCodeBuilder.toHashCode(); }

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  • MIgrating to Oracle

    - by Harish
    We are using a JEE application and we are right now using Informix DB.Our code hits the DB with queries like "select first 10 * from test" Now as far as I know Oracle does not support 'first 10 *' kind of statements.We have more than 1000 queries like this.Should we manually change this or can have some manual customization?

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  • versioning fails for onetomany collection holder

    - by Alexander Vasiljev
    given parent entity @Entity public class Expenditure implements Serializable { ... @OneToMany(mappedBy = "expenditure", cascade = CascadeType.ALL, orphanRemoval = true) @OrderBy() private List<ExpenditurePeriod> periods = new ArrayList<ExpenditurePeriod>(); @Version private Integer version = 0; ... } and child one @Entity public class ExpenditurePeriod implements Serializable { ... @ManyToOne @JoinColumn(name="expenditure_id", nullable = false) private Expenditure expenditure; ... } While updating both parent and child in one transaction, org.hibernate.StaleObjectStateException is thrown: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): Indeed, hibernate issues two sql updates: one changing parent properties and another changing child properties. Do you know a way to get rid of parent update changing child? The update results both in inefficiency and false positive for optimistic lock. Note, that both child and parent save their state in DB correctly. Hibernate version is 3.5.1-Final

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  • How Does Ctrl-K work in Stackoverflow

    - by harigm
    I am very curious to know how to implement the Ctrl-K feature against code, For sample public static void main(Stirng args[]){ System.out.println.out("welcome"); } That will be nicely formatted? 1)Do we require any package to implement this? 2) Any ready made code avaialble to do this? Can any one help me with this, I am planning to develop a site where this feature would be a real helpful.

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  • Inspect in memory hsqldb while debugging

    - by Albert
    We're using hdsqldb in memory to run junit tests which operate against a database. The db is setup before running each test via a spring configuration. All works fine. Now when a tests fails it can be convinient to be able to inspect the values in the in memory database. Is this possible? If so how? Our url is: jdbc.url=jdbc:hsqldb:mem:testdb;sql.enforce_strict_size=true The database is destroyed after each tests. But when the debugger is running the database should also still be alive. I've tried connecting with the sqldb databaseManager. That works, but I don't see any tables or data. Any help is highly appreciated!

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  • Consistent Equals() results, but inconsistent TreeMap.containsKey() result

    - by smessing
    I have the following object Node: private class Node implements Comparable<Node>(){ private String guid(); ... public boolean equals(Node o){ return (this == o); } public int hashCode(){ return guid.hashCode(); } ... } And I use it in the following TreeMap: TreeMap<Node, TreeSet<Edge>> nodes = new TreeMap<Node, TreeSet<Edge>>(); Now, the tree map is used in a class called Graph to store nodes currently in the graph, along with a set of their edges (from the class Edge). My problem is when I try to execute: public containsNode(n){ for (Node x : nodes.keySet()) { System.out.println("HASH CODE: "); System.out.print(x.hashCode() == n.hashCode()); System.out.println("EQUALS: "); System.out.print(x.equals(n)); System.out.println("CONTAINS: "); System.out.print(nodes.containsKey(n)); System.out.println("N: " + n); System.out.println("X: " + x); } } I sometimes get the following: HASHCODE: true EQUALS: true CONTAINS: false N: foo X: foo Anyone have an idea as to what I'm doing wrong? I'm still new to all this, so I apologize in advance if I'm overlooking something simple (I know hashCode() doesn't really matter for TreeMap, but I figured I'd include it).

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  • How do I create a custom text field in Tapestry5 that renders some Javascript onto the page?

    - by shane87
    I have been trying to create a custom textfield in tapestry which will render some javascript when it gains focus. But I have been having trouble trying to find an example of this. Here is some of the code i have started off with: package asc.components; import org.apache.tapestry5.ComponentResources; import org.apache.tapestry5.Field; import org.apache.tapestry5.annotations.Parameter; import org.apache.tapestry5.ioc.annotations.Inject; import org.apache.tapestry5.services.ComponentDefaultProvider; public class DahserTextField implements Field { @Parameter (defaultPrefix = "literal") private String label; @Inject private ComponentResources resources; @Inject private ComponentDefaultProvider defaultProvider; @Parameter private boolean disabled; @Parameter private boolean required; String defaultLabel(){ return defaultProvider.defaultLabel(resources); } public String getControlName() { return null; } public String getLabel() { return label; } public boolean isDisabled() { return disabled; } public boolean isRequired() { return required; } public String getClientId() { return resources.getId(); } } I have been unsure on what to do next. I do not know what to put into the .tml file. I would be grateful if anyone could help or point me in the right direction.

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  • Pause and Resume AsyncTasks? (Android)

    - by Matt Swanson
    I have an AsyncTask that acts as a countdown timer for my game. When it completes the countdown it displays the out of time end screen and it also updates the timer displayed on the screen. Everything works fine, except I need to be able to pause and resume this when the pause button in the game is pressed. If I cancel it and try to re-execute it, it crashes with an IllegalStateException. If I cancel it and instantiate a new AsyncTask in its place the old one begins to run again and the new one runs at the same time. Is there a way to cancel/pause the timer and restart it using AsyncTasks or is there a different way I should be going about doing this?

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  • Why is internationalization not working properly? JSF

    - by Nitesh Panchal
    Hello, This is my messages_en_US.properties file in WEB-INF/classes folder :- Login=Login And then i created messages_fr_FR.properties :- Login=frenchLogin Then in my JSF page i wrote this :- <f:loadBundle basename="messages" var="msg"/> <h:commandButton id="btnLogin" value="#{msg.Login}" actionListener="#{IndexBean.doLogin}"/> I can correctly see the Login text by default. But when i go in firefox and change my default language to fr-fr, my text still remains the same i.e i can't see frenchLogin. I don't have anything in my faces-config.xml What am i doing wrong? Thanks in advance :)

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