In DataFX & JavaFX there's many annotation do same thing. At least that's what I think. My question is when to use each one of these annotation?
#FXML
#FXMLController
#ViewNode
Let me describe each of these annotations and how they are relevant while using DataFX.
#FXML - This annotation enables an FXMLLoader to inject values defined in an FXML file into references in the controller class. It is a part of JavaFX.
#FXMLController - This annotations is used by the controller class to define its FXML file that contains the layout of the view.
#ViewNode and #ViewController - #ViewNode was introduced in DataFX as a successor to #FXML. With its introduction, #FXMLController was renamed to #ViewController. The entire commit can be found here.
Here is another good source of information.
Related
I have been trying go through code of Broadleaf Commerce. There were multiple Custom Annotations used however I was not able to locate there Processor. Can anyone help me here. To take example #AdminPresentation it a custom annotation in package org.broadleafcommerce.common.presentation;
However how this is processed throughout the app, I was not able to locate. What I have understood till now we can use Reflection or AOP for its processing. But There was nothing for this.
Please help.
Source code - https://github.com/BroadleafCommerce/BroadleafCommerce
For a short answer, org.broadleafcommerce.openadmin.server.dao.provider.metadata.BasicFieldMetadataProvider#addMetadata is one place that processes those annotations.
On a broader level, the controllers in the openadmin will use the AdminEntityService to get ClassMetaData (all data about how a class should be displayed to an admin user). The #AdminPresentation annotation is one source of this data. The method AdminEntityServiceImpl#getClassMetadata is the main gateway for getting the ClassMetaData.
#getClassMetadata calls #inspect and eventually gets to PersistenceManager#inspect. This method uses the DynamicEntityDao to eventually get to Metadata#getFieldMetadataForTargetClass. That method gets each field of a class via reflection, and then each of those Fields is processed through the available FieldMetadataProviders. The FieldMetadataProviders turn a java.lang.reflect.Field into org.broadleafcommerce.openadmin.dto.FieldMetadata.
Any provided FieldMetadataProvider can contribute field metadata. This metadata is used in the FormBuilderService to construct the admin page.
Class References:
AdminEntityService - org.broadleafcommerce.openadmin.server.service.AdminEntityServiceImpl
PersistenceManager - org.broadleafcommerce.openadmin.server.service.persistence.PersistenceManagerImpl#inspect
DynamicEntityDao - org.broadleafcommerce.openadmin.server.dao.DynamicEntityDaoImpl#getPropertiesForEntityClass
Metadata - org.broadleafcommerce.openadmin.server.dao.Metadata#getFieldMetadataForTargetClass
FieldMetadataProvider - org.broadleafcommerce.openadmin.server.dao.provider.metadata.FieldMetadataProvider, org.broadleafcommerce.openadmin.server.dao.DynamicEntityDaoImpl#fieldMetadataProviders
FormBuilderService - org.broadleafcommerce.openadmin.web.service.FormBuilderServiceImpl
Have a look to :
https://www.baeldung.com/java-custom-annotation
You will get explanations about : "default" in the Custom Annotations.
Florent COUDERT.
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I want to know about how spring servlet component scan works? and it scan #Service,#Component etc scan.But I am not clear how it works? What flow works behind this?
The best thing to do when you're curious about how something is implemented in an open source project is to look at the source code. Here's how I would go about it. These steps are specific to my particular configuration (XML based Spring contexts written with Eclipse) but the general theory is applicable to any environment....
1) I know from poking around the source code that the classes that parse particular XML config elements usually have a name that ends with "BeanDefinitionParser". So to see how:
<context:component-scan base-package="com.yourproject" />
is implemented, look for classes named "Component*BeanDefinitionProcessor".
2) Doing a CTRL + SHIFT + T in Eclipse and searching for "Component*BeanDefinitionProcessor" I came up with ComponentScanBeanDefinitionParser. That sounds like it's probably what I'm looking for...
3) Within that class (lines 83 - 85), there's this chunk of code:
ClassPathBeanDefinitionScanner scanner = configureScanner(parserContext, element);
Set<BeanDefinitionHolder> beanDefinitions = scanner.doScan(basePackages);
registerComponents(parserContext.getReaderContext(), beanDefinitions, element);
So the class that processes XML tags delegates to ClassPathBeanDefinitionScanner. This makes sense since Spring supports both XML configuration as well as Java based configuration. It wouldn't make sense to duplicate the actual scanning logic in the annotations config handler and the XML config handler.
4) Looking at the code for ClassPathBeanDefinitionScanner, I don't see anything that looks like it's looking for things on the classpath. However, it does extend a class named ClassPathScanningCandidateComponentProvider.
public class ClassPathBeanDefinitionScanner extends ClassPathScanningCandidateComponentProvider {
5) Looking in ClassPathScanningCandidateComponentProvider, I can see the for loop that's looping over everything in a package
public Set<BeanDefinition> findCandidateComponents(String basePackage) {
Set<BeanDefinition> candidates = new LinkedHashSet<BeanDefinition>();
try {
String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
resolveBasePackage(basePackage) + "/" + this.resourcePattern;
Resource[] resources = this.resourcePatternResolver.getResources(packageSearchPath);
boolean traceEnabled = logger.isTraceEnabled();
boolean debugEnabled = logger.isDebugEnabled();
for (int i = 0; i < resources.length; i++) {
6) It's using ResourcePatternResolver to find stuff on the classpath:
private ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
7) In PathMatchingResourcePatternResolver you can see the code that actually searches the classpath.
How component scan in spring?
It boils down to doing some gymnastics with class loaders and resource path matching and using the ClassLoader.getResources(String name) method which returns an Enumeration containing URLs representing classpath resources. Those resources (Java classes) are then checked to see if they contain the #Component annotation (or a specialization of it) and if so, are considered a "candidate" component. Other filtering can take place but by default those components are then defined programmatically as Spring beans. When annotation configuration is enabled, autowiring of components also takes place, so I can have Spring scan the classpath for all my web controllers, and then automatically inject dependencies such as services or data access objects.
The actual classes that perform this magic are the ClassPathScanningCandidateComponentProvider which, by default, uses a PathMatchingResourcePatternResolver to find matching classpath resources using ClassLoader.getResources().
As per Spring documentation Spring beans are singletons by default.
As with Spring-managed components in general, the default and by far
most common scope is 'singleton'. However, there are times when other
scopes are needed. Therefore Spring 2.5 introduces a new #Scope
annotation as well. Simply provide the name of the scope within the
annotation
#Scope(StandardScopes.PROTOTYPE)
#Repository
public class MovieFinderImpl implements MovieFinder {
// ...
}
Different Bean scopes are avialable here.
Is there a way to style the validation message (WrongValueException etc.)
Because it is absolutly not touch friendly.
I searched in the docs of zk but i found nothing.
Currently I use Zk 6.5.2
The validation messages are displayed in an ErrorBox widget.
The z class is z-errbox. Unfortunately, I don't believe ZK gives you a hook to specify a custom z class for any particular ErrorBox. This means the only way to override the style for an ErrorBox is to override the style for all ErrorBoxes. It sounds like that might work for you, if so, you can see the the ZK style class definitions in the source code.
For example, you could override the validation text color with..
.z-errbox-center {
color: blue;
}
As a side note, you'll probably want to hook your custom CSS file into ZK rather than manually loading it on the page. This will ensure it gets loaded as fast as possible and the user won't see the styles change as the page loads.
(in WEB-INF/zk.xml)
<desktop-config>
<theme-uri>/css/style.min.css</theme-uri>
</desktop-config>
You can read more about the theme-uri tag in the documentation.
To summarize the answer shown here Code assist in (jsp /jstl) view for Spring MVC model objects in Eclipse
is not working for me at all, is there a setting that I need to change ?
I have just downloaded the sample spring-mvc-showcase on github, and it doesn't work out of the box on that project (with either 11.1.3 or EAP 12 version both full enterprise editions), see below (I have no idea where it gets formBean from) :
Here is an example from my own project,the screen shot below (bottom frame) shows my controller adding a string attribute to model and returning correct view name. I would then expect shopString to be offered up as autocomplete option when editing that view, however it is not :
sg is a javascript variable - so great it should be there, but where is "shopString" ?.
Is there a setting I need to change or something else I am missing to get this functionality (using 11.1.3 enterprise edition with all the spring plugins).
It is also failing on spring specific variables :
IS their an open source (one of the spring tutorial projects?) where this definitely works ... or is there a setting I need change in my Intellij install (I have tested with a brand new download of the version 12 EAP) ?
One more screenshot below shows all my spring coifg files set up correctly via autodetection, but the code inspections fails ... this is the spring-mvc-showcase project :
There's a standard way to do this, which is not IntelliJ-specific.
<jsp:useBean id="someModel" scope="request" type="foo.bar.SomeModelClass"/>
The type attribute here does not need to be a concrete class, it can be an interface type as well. Typically you'd put these declarations at the start of your JSP/JSPX files, to provide something like a "declaration of model inputs".
Using JSPs in such a declarative way was recommended in the original book on Spring, in fact (Expert One-on-One J2EE Design and Development.). IntelliJ has been providing full code completion for such pages since at least 7 years.
Note that there are additional relevant convenience features in IntelliJ: if an EL variable reference is marked as undefined, you can press Alt-Enter to select a QuickFix, which will insert a declaration like above. It will even try to figure out the actual type, based on the properties you're accessing.
As I understand Spring, there is no declaration for definitions of variables that you may put into your model. The call model.addAttribute() may add an object to the model, either identified by a parameter or automatically generated by the class name of the object.
So imagine the following case where you have more than one method:
#RequestMapping("foo") public String foo(Model model) {
model.addAttribute("model", new Foo());
return new Random().nextBoolean() ? "page" : "someOtherPage";
}
#RequestMapping("bar") public String bar(Model model) {
model.addAttribute("model", new Bar());
model.addAttribute("model", new Foo());
model.addAttribute("model", new Bar());
return new Random().nextBoolean() ? "page" : "someOtherPage";
}
and the JSP would be something like
<c:out ${model.value} />
Since there is no proper mapping of which controllers may under some circumstances forward to which views, nor what exactly lies within the model, your IDE has no real chance to provide you with proper information.
But to support the IDE in suggesting you some useful information, you can use type hints. Therefore, you have to copy the whole reference of an object, e. g. foo and add a JSP comment like:
<%--#elvariable id="foo" type="com.mycompany.SomeObject"--%>
The warning will vanish and the full IDE support is on your side, allowing you to traverse the fields of foo.
One of the nicest things is that the unused getter warnings will vanish, too. You can directly call the show usages action directly from the JSP or the POJO.
This also works with JSF and particularly within JSF components. Pretty neat feature to have this kind of code completion, showing warnings and errors.
Hope that helps you with your switch to Intellij Idea.
Edit: I also reported this finding to a friend wo wrapped the whole thing into a nice blog entry. Maybe you're interested in reading it: open link
This got fixed in the latest release of intellij 122.694
I faced with similar issue when start writing my own interceptor. Problem was that I start using refference in my view resolver configuration
don't use contruction like this
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" ref="prefix"/>
<property name="suffix" ref="suffix"/>
</bean>-
The Java Beans Introspection API includes in the PropertyDescriptor class the method isExpert. Bean-based GUI editors, like WindowsMaker, use this to hide or show "exotic" properties.
What causes a certain property of a Java bean to be considered "expert"? How does the Swing library, for example, sets certain properties as "expert properties"? How can I programmatically do the same for Java beans that I write?
This apparently is done in the JDK using a non-standard compiler extension.
If you have a look at the Swing source code, some Javadoc comments include a #beaninfo tag, containing such information:
/**
* ... Some comment ...
* #beaninfo
* bound: true
* expert: true
*/
public void setSomething(SomeType value) {
// ...
}
Here is an example, in the JTable class source code.
I also found this article, talking about the #beaninfo tag.
You can create a BeanInfo class for your bean. This allows you to customize the property descriptor. There is a section covering this in the JavaBean tutorial.