I am currently reading Core JavaServer Faces(3e) book.
I am trying to run the ajax spinner code from the 11th chapter of the book.
I am using Oracle enterprise pack for eclipse, weblogic 10.3.5 server & Mojarra impl.
But the UISpinner class is showing the following error message:
“The type UISpinner must implement the inherited abstract method
ClientBehaviorHolder.getClientBehaviors() “
However, as per the jsf spec - UIComponentBase class implements the getClientBehaviors() method which is inherited by the UISpinner class. Still why I am getting this error? Please help.
Here is the UISpinner class implementation:
package com.corejsf;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.faces.component.FacesComponent;
import javax.faces.component.UIInput;
import javax.faces.component.behavior.ClientBehavior;
import javax.faces.component.behavior.ClientBehaviorHolder;
import javax.faces.convert.IntegerConverter;
#FacesComponent("com.corejsf.Spinner")
public class UISpinner extends UIInput implements ClientBehaviorHolder {
private static List<String> eventNames = Arrays.asList("click");
public UISpinner() {
setConverter(new IntegerConverter());
// to convert the submitted value
setRendererType("com.corejsf.JSSpinner");
// this component has a renderer
}
public String getDefaultEventName() { return "click"; }
public Collection<String> getEventNames() { return eventNames; }
}
What you have going on is a little tricky. You are right that UIInput extends UIComponentBase, which does implement getClientBehaviors(). However, you are implementing ClientBehaviorHolder, which has a public getClientBehaviors() method.
The class you are implementing MUST have that method and apparently it can't come from the class you are extending. What I would do is go ahead an implement that method with a simple empty return value like:
return Collections.emptyMap();
Related
I'm trying to create a spring bean with a variable of type ArrayList. In this situation, Please suggest me what's the best option to define this variable to support concurrency without causing any issues while accessing the variable.
Here is my sample code.
import java.util.ArrayList;
import java.util.List; import
org.springframework.stereotype.Component;
#Component
public class MySpringBean {
private List myListVar = new ArrayList<>();
public List getMyListVar() {
return myListVar; }
public void setMyListVar(List myListVar) {
this.myListVar = myListVar; }
}
According to the tutorial Testing the Web Layer, testing that the controller has been created can be done with the following code:
#Test
public void contexLoads() throws Exception {
assertThat(controller).isNotNull();
}
but I get the following error:
The method assertThat(T, Matcher<? super T>) in the type Assert is not applicable for the arguments (HomeController)"
even with the statement:
import static org.junit.Assert.assertThat;
The code of my class is the same than the one given in the example:
package com.my_org.my_app;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
#RunWith(SpringRunner.class)
#SpringBootTest
public class SmokeTest {
#Autowired
private HomeController controller;
#Test
public void contexLoads() throws Exception {
assertThat(controller).isNotNull();
}
}
If I change the assert statement to:
#Test
public void contexLoads() throws Exception {
assertNotNull(controller);
}
it works as expected.
My controller class has some Autowired objects, but since they are managed by Spring Boot it should not be an issue. Any idea of what could be wrong with assertThat(controller).isNotNull();? Thanks in advance.
You used the wrong assertThat import. You should use the following:
import static org.assertj.core.api.Assertions.assertThat;
The correct method is located in AssertJ library, not in JUnit.
I feel stupid to even ask for this but I spent days looking for the answer and I'm still with nothing.
I wanna include simple Spring IoC container in my project. All I want it to do is to allow me Injecting/Autowiring some reusable objects in other classes. What I've done so far looks like this:
-> Project structure here <-
Configuration code:
package com.example;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import java.util.Random;
#Configuration
#ComponentScan(basePackages = "com.example")
public class AppConfig {
#Bean
public Random rand() {
return new Random(42);
}
#Bean
public String string() {
return "Hello World!";
}
}
Main class code:
package com.example;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.Random;
public class Main {
#Autowired
Random rand;
#Autowired
String string;
public static void main(String[] args) {
// workflow
Main main = new Main();
System.out.println(main.string);
}
}
AnotherClass code:
package com.example.deeperpackage;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.Random;
public class AnotherClass {
#Autowired
Random rand;
#Autowired
String string;
public void methodToBeCalled() {
// TODO
System.out.println(string);
}
}
How can I make these #Autowired annotations work? Do I have to instantiate container in every single class in which I want to autowire components? I've seen in work a oracle app which used Spring and #Inject to distribute objects to numerous classes and there was no container logic in any class available for me. Just fields with #Inject annotation. How to achieve that?
Simply add the annotation #Component on the classes you want to inject :
#Component
public class AnotherClass {
...
}
But you cannot inject static attributes and when you do new Main(), no Spring context is being created. If you use Spring Boot, you should look at how to write a main with it.
https://spring.io/guides/gs/spring-boot/
I am getting following error in my weblogic console when i am starting my server.
SEVERE: Missing dependency for constructor
public com.test.mine.exception.JsonExceptionMapper(java.lang.String,com.fasterxml.jackson.core.JsonLocation) at parameter index 0
SEVERE: Missing dependency for constructor public com.test.mine.exception.JsonExceptionMapper(java.lang.String,com.fasterxml.jackson.core.JsonLocation) at parameter index 1
Below is my java code.
package com.test.mine.exception;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import com.fasterxml.jackson.core.JsonLocation;
import com.fasterxml.jackson.core.JsonParseException;
#Provider
#Service
public class JsonExceptionMapper extends JsonParseException implements ExceptionMapper {
public JsonExceptionMapper(String msg, JsonLocation loc) {
super(msg, loc);
// TODO Auto-generated constructor stub
}
private static final Logger LOGGER = LoggerFactory.getLogger(JsonExceptionMapper.class);
protected Logger getLogger() {
return LOGGER;
}
public Status getStatus(JsonParseException thr) {
return Status.BAD_REQUEST;
}
#Override
public Response toResponse(Throwable arg0) {
// TODO Auto-generated method stub
return Response.status(Status.BAD_REQUEST).type(MediaType.APPLICATION_JSON_TYPE).build();
}
}
The annotation #Service tells spring to create a singleton of the annotated class. At startup spring tries to create that instance and to provide the required constructor args String msg, JsonLocation loc which it does not find, so the exception.
JsonExceptionMapper does not look like a service, and it should not be a singleton. Instead it must be created whenever an exception is created.
I have never worked with that class, so sorry, cannot give you any advice on how to do that.
I bumped into a similar problem while configuring swagger to work with Jersey. After searching various forums found that Jersey scanning require a constructor without parameters. I added a a constructor and it worked for me.
I'm working with Spring 3.2. In order to validate double values globally, I use CustomNumberEditor. The validation is indeed performed.
But when I input a number like 1234aaa, 123aa45 and so forth, I expect the NumberFormatException to be thrown but it doesn't. The docs says,
ParseException is caused, if the beginning of the specified string cannot be
parsed
Therefore, such values as mentioned above are parsed up to they are represented as numbers and the rest of the string is then omitted.
To avoid this, and to make it throw an exception, when such values are fed, I need to implement my own Property Editor by extending the PropertyEditorSupport class as mentioned in this question.
package numeric.format;
import java.beans.PropertyEditorSupport;
public final class StrictNumericFormat extends PropertyEditorSupport
{
#Override
public String getAsText()
{
System.out.println("value = "+this.getValue());
return ((Number)this.getValue()).toString();
}
#Override
public void setAsText(String text) throws IllegalArgumentException
{
System.out.println("value = "+text);
super.setValue(Double.parseDouble(text));
}
}
The editors I have specified inside a method annotated with the #InitBinder annotation are as follows.
package spring.databinder;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.Format;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.beans.propertyeditors.CustomNumberEditor;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.context.request.WebRequest;
#ControllerAdvice
public final class GlobalDataBinder
{
#InitBinder
public void initBinder(WebDataBinder binder, WebRequest request)
{
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
dateFormat.setLenient(false);
binder.setIgnoreInvalidFields(true);
binder.setIgnoreUnknownFields(true);
//binder.setAllowedFields("startDate");
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
//The following is the CustomNumberEditor
NumberFormat numberFormat = NumberFormat.getInstance();
numberFormat.setGroupingUsed(false);
binder.registerCustomEditor(Double.class, new CustomNumberEditor(Double.class, numberFormat, false));
}
}
Since I'm using Spring 3.2, I can take advantage of #ControllerAdvice
Out of curiosity, the overridden methods from the PropertyEditorSupport class in the StrictNumericFormat class are never invoked and the statements that redirect the output to the console as specified inside of those methods (getAsText() and setAsText()) don't print anything on the server console.
I have tried all the approaches described in all the answers of that question but none worked for me. What am I missing here? Is this required to configure in some xml file(s)?
Clearly you have nowhere passed the StrictNumericFormat reference. You should register your editor like:
binder.registerCustomEditor(Double.class, new StrictNumericFormat());
BTW Spring 3.X introduced a new way achieving conversion:Converters