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Equals and HashCode | Hibernate | JBoss Community - 0 views

community.jboss.org/...EqualsAndHashCode hibernate equals() hashcode() database best practice
shared by kuni katsuya on 18 Jul 12 - No Cached
  • best strategies for implementation of equals() and hashcode() in your persistent classes
  • The general contract is: if you want to store an object in a List, Map or a Set then it is an requirement that equals and hashCode are implemented so they obey the standard contract as specified in the  documentation
  • Why are equals() and hashcode() importantNormally, most Java objects provide a built-in equals() and hashCode() based on the object's identity; so each new() object will be different from all others.
  • ...8 more annotations...
  • Separating object id and business key
  • recommend using the "semi"-unique attributes of your persistent class to implement equals() (and hashCode()
  • The database identifier property should only be an object identifier, and basically should be used by Hibernate only
  • Instead of using the database identifier for the equality comparison, you should use a set of properties for equals() that identify your individual objects
  • "name" String and "created" Date, I can use both to implement a good equals() method
  • Workaround by forcing a save/flush
  • work around by forcing a save() / flush() after object creation and before insertion into the set
  • Note that it's highly inefficient and thus not recommended
26More

Enterprise JavaBeans 3.1 with Contexts and Dependency Injection: The Perfect Synergy - 0 views

www.oracle.com/...ejb-3-1-175064.html javaee6 ejb3.1 cdi
shared by kuni katsuya on 12 Jul 12 - No Cached
  • stateless EJB 3.1 bean as boundary (Facade)
  • injected managed beans (controls)
  • @Inject
  • ...22 more annotations...
  • @Inject
  • CDI managed beans. The @EJB annotation is removed and @Inject is used instead
  • Annotating the boundary (Cart) with the @Named annotation makes the Cart immediately visible for expression language (EL) expressions in JSP and JSF
  • @Named annotation takes the simple name of the annotated class, puts the first character in lowercase, and exposes it directly to the JSF pages (or JSP). The Cart bean can be accessed directly, without any backed or managed beans, by the JSF pages: <h:commandButton value="Check out!" action="#{cart.checkout}" />
  • If there is a need for abstraction, the class can be turned into an interface (or abstract class)
  • local implementation (with CDI events
  • @Inject Event<String> event;
  • event.fire("Order proceeded!");
  • remote implementation:
  • javax.enterprise.event.Event belongs to the CDI-implementation
  • class Event can be considered to be a lightweight alternative to the java.beans.PropertyChangeSupport class
  • @Inject Event<String> event;
  • event.fire("Order proceeded!");
  • event can be received by any managed bean and also by EJB beans
  • provide a method with a single @Observes annotated parameter
  • @Observes String event
  • there is no real event, just the payload:
  • The during attribute in the @Observes annotation allows you to select in which transactional phase the event gets delivered. The default setting is IN_PROGRESS, which causes an immediate event delivery regardless of the transaction outcome. The AFTER_SUCCESS configuration causes the delivery to occur only after successful transaction completion
  • Although CDI events work only inside a single process (in the default case, CDI is extensible), they are perfectly suitable for decoupling packages from modules
  • The method checkout() starts a transaction that gets "reused" by the OrderSystem and CustomerNotification session beans
  • ordering.placeOrder(); notifier.sendNotification();
    • kuni katsuya
      kuni katsuya on 18 Jul 12
       
      both run within same transaction
  • EJB beans cannot be directly exposed to JSF or JSP without a little help from CDI
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Logback-beagle - 0 views

logback.qos.ch/beagle logback-beagle eclipse-plugin
shared by kuni katsuya on 18 Jul 12 - No Cached
  • Logback-beagle: an Eclipse plug-in for viewing logs
  • Logback-beagle is intended as a replacement for viewing logs via the console. It offers several advantages over the plain-old console: Events of level WARN and ERROR are marked by an orange flag and respectively a red flag. Quickly jump to the class and line where a given logging request originated Easly view and jump to the callers of any log statement upto eight levels deep Change the output format on-the-fly Measure the time elapsed between any two lines of log
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Graphical Eclipse FAQs - Eclipsepedia - 0 views

wiki.eclipse.org/Graphical_Eclipse_FAQs eclipse package explorer hierarchical
shared by kuni katsuya on 17 Jul 12 - No Cached
  • kuni katsuya on 17 Jul 12
     
    How do I alter my package representation so that parent packages are housing child packages? 1. Click on the dropdown menu on the Package Explorer view. Go to the 'Package Representation' submenu and then click on 'Hierarchical'.
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Eclipse Project Release Notes 4.2 - 0 views

www.eclipse.org/...readme_eclipse_4.2.html eclipse juno ReleaseNotes
shared by kuni katsuya on 17 Jul 12 - No Cached
  • 1. Target Operating Environments
  • In general, the 4.2 release of the Eclipse Project is developed on Java SE 6 VMs
  • Eclipse 4.2 is tested and validated on the following reference platforms
  • ...5 more annotations...
  • Windows
  • Oracle Java 7 Update 2
  • Oracle Java 6 Update 27
  • x86 32-bit
  • x86 64-bit
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Graphical Eclipse FAQs - Eclipsepedia - 0 views

wiki.eclipse.org/Graphical_Eclipse_FAQs eclipse package explorer hierarchical
shared by kuni katsuya on 17 Jul 12 - No Cached
  • How do I alter my package representation so that parent packages are housing child packages? 1. Click on the dropdown menu on the Package Explorer view. Go to the 'Package Representation' submenu and then click on 'Hierarchical'.
  • PDE I get an unhandled event loop exception in my console. What gives? 1. Open up the run dialog via the dropdown toolbar item.
  • 2. Select your Eclipse Application launch configuration. Go into the 'Arguments' tab and then append '-consoleLog' as an argument and then try running your application again.
  • ...3 more annotations...
  • 2. You should now see your packages presented in a tree like structure.
  • How do I not install a plug-in's extraneous dependency when I'm in the Update Manager? 1. Are you seeing a screen similar to the one where the plug-in you are installing is asking for some other plug-in? 2. Expand the section by clicking on the arrow. Keep expanding until you see everything and then tick off the "additional dependencies" that you don't want. 3. Now you can install the plug-in without installing other things.
  • I have just installed a plug-in but I do not see any indication of it in my workspace. What do I do? 1. Did you try restarting Eclipse with the -clean argument?
  • kuni katsuya on 17 Jul 12
     
    How do I alter my package representation so that parent packages are housing child packages? 1. Click on the dropdown menu on the Package Explorer view. Go to the 'Package Representation' submenu and then click on 'Hierarchical'.
7More

FAQ How do I run Eclipse? - Eclipsepedia - 0 views

wiki.eclipse.org/FAQ_How_do_I_run_Eclipse%3F eclipse jvm configuration
shared by kuni katsuya on 17 Jul 12 - Cached
  • Find the JVM If a JVM is installed in the eclipse/jre directory, Eclipse will use it; otherwise the launcher will consult the eclipse.ini file and the system path variable
  • Eclipse DOES NOT consult the JAVA_HOME environment variable
  • eclipse.ini The most recommended way to specify a JVM for Eclipse to run in is to put startup configuration into the eclipse.ini file
  • ...3 more annotations...
  • To specify a JVM using configuration file, include the -vm argument in eclipse.ini, for example: -vm c:/jre/bin/javaw.exe
  • Note: there are no quotes around this path as would be required when executing the same from the command-line were the path to contain white space, etc. This is a common mistake when using Windows.
  • You should always use -vm so you can be sure of what VM you are using. Installers for other applications sometimes modify the system path variable, thus changing the VM used to launch Eclipse without your knowing about it.
  • kuni katsuya on 17 Jul 12
     
    Find the JVM If a JVM is installed in the eclipse/jre directory, Eclipse will use it; otherwise the launcher will consult the eclipse.ini file and the system path variable. Eclipse DOES NOT consult the JAVA_HOME environment variable.
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