I have an action URL after clicking a hyper link like so
/SocialStupendous/GetProfile.action?slno=3&slno=3
In my execute method of ActionClass I have the following code
public String execute() {
int urislno=Integer.parseInt(getServletRequest().getParameter("slno"));
System.out.println(urislno);
bean.setUslno(urislno);
}
I am getting NullPointerException when I am performing bean.setuslno(urislno). Even though urislno is printed properly as 3.
ProfileBean class:
public class ProfileBean {
private int uslno;
public int getUslno() {
return uslno;
}
public void setUslno(int uslno) {
this.uslno = uslno;
}
}
Why is this happening?
The bean is not initialized. You should initialize it somehow in the action
private ProfileBean bean = new ProfileBean();
//and add getter ans setter
the better approach, however is let the container to do it for you. You just need to create a bean configuration in the struts.xml
<bean class="com.yourpackagename.ProfileBean" scope="default"/>
then you would have
private ProfileBean bean;
#Inject
public void setProfileBean(ProfileBean bean) {
this.bean = bean;
}
and you don't need to parse request for parameters, this is already done by the params interceptor which is a part of defaultStack that your action should run. You should create properties in your action to hold parameter values.
private Integer slno;
public Integer getSlno() {
return slno;
}
public void setSlno(Integer uslno) {
this.slno = slno;
}
and the action will look like
public String execute() {
if (slno != null) {
System.out.println(slno)
bean.setUslno(slno);
}
......
return SUCCESS;
}
Related
I am working within an environment that changes credentials every several minutes. In order for beans that implement clients who depend on these credentials to work, the beans need to be refreshed. I decided that a good approach for that would be implementing a custom scope for it.
After looking around a bit on the documentation I found that the main method for a scope to be implemented is the get method:
public class CyberArkScope implements Scope {
private Map<String, Pair<LocalDateTime, Object>> scopedObjects = new ConcurrentHashMap<>();
private Map<String, Runnable> destructionCallbacks = new ConcurrentHashMap<>();
private Integer scopeRefresh;
public CyberArkScope(Integer scopeRefresh) {
this.scopeRefresh = scopeRefresh;
}
#Override
public Object get(String name, ObjectFactory<?> objectFactory) {
if (!scopedObjects.containsKey(name) || scopedObjects.get(name).getKey()
.isBefore(LocalDateTime.now().minusMinutes(scopeRefresh))) {
scopedObjects.put(name, Pair.of(LocalDateTime.now(), objectFactory.getObject()));
}
return scopedObjects.get(name).getValue();
}
#Override
public Object remove(String name) {
destructionCallbacks.remove(name);
return scopedObjects.remove(name);
}
#Override
public void registerDestructionCallback(String name, Runnable runnable) {
destructionCallbacks.put(name, runnable);
}
#Override
public Object resolveContextualObject(String name) {
return null;
}
#Override
public String getConversationId() {
return "CyberArk";
}
}
#Configuration
#Import(CyberArkScopeConfig.class)
public class TestConfig {
#Bean
#Scope(scopeName = "CyberArk")
public String dateString(){
return LocalDateTime.now().toString();
}
}
#RestController
public class HelloWorld {
#Autowired
private String dateString;
#RequestMapping("/")
public String index() {
return dateString;
}
}
When I debug this implemetation with a simple String scope autowired in a controller I see that the get method is only called once in the startup and never again. So this means that the bean is never again refreshed. Is there something wrong in this behaviour or is that how the get method is supposed to work?
It seems you need to also define the proxyMode which injects an AOP proxy instead of a static reference to a string. Note that the bean class cant be final. This solved it:
#Configuration
#Import(CyberArkScopeConfig.class)
public class TestConfig {
#Bean
#Scope(scopeName = "CyberArk", proxyMode=ScopedProxyMode.TARGET_CLASS)
public NonFinalString dateString(){
return new NonFinalString(LocalDateTime.now());
}
}
I use Play 2.5.12 to provide a web service to create an object and validate its attributes. Here is a simplified code of what I want to do:
public class Example {
private String lastName;
private List<String> firstNames;
private Map<String, Integer> vehicles;
public Example() {}
public String validate() {
if (vehicles.get("Ferrari") != null)
return "Liar!";
return null;
}
#Override
public String toString() {
return new ToStringBuilder(this).append(lastName).append(firstNames).append(vehicles).toString();
}
// getters and setters
}
public class ExampleController extends Controller {
private FormFactory formFactory;
#Inject
public ExampleController(FormFactory formFactory) {
this.formFactory = formFactory;
}
#BodyParser.Of(BodyParser.Json.class)
public Result createExample() {
Example exampleFromJackson = Json.fromJson(request().body().asJson(), Example.class);
System.out.println(exampleFromJackson.toString());
Example exampleFromForm = formFactory.form(Example.class).bindFromRequest().get();
System.out.println(exampleFromForm.toString());
// etc
return created();
}
}
If I call the web service with a body like this:
{
"lastName": "Martin",
"firstNames": ["Robert", "Cecil"],
"vehicles": {
"BMW": 1,
"Seat": 1
}
}
The deserialized object by jackson prints correctly then this error occurs:
org.springframework.beans.InvalidPropertyException: Invalid property 'firstNames[0]' of bean class [models.Example]: Property referenced in indexed property path 'firstNames[0]' is neither an array nor a List nor a Map; returned value was [[]]
If I replace the Set by a List, I can avoid this error and then I obtain the following:
models.Example#68d2162a[Martin,[Robert, Cecil],{BMW=1, Seat=1}]
models.Example#29ef1c11[Martin,[Robert, Cecil],{}]
The deserialized object by jackson is correct but the one obtained by the request isn't so I can't do a correct validation.
So my questions are:
- Why Play doesn't let me use a Set?
- Why is the Map not retrieved?
I am having trouble figuring out why an EJB session bean is not working. The actual error message is an EJBException: NameNotFoundException, but that is not a very illuminating message.
I have traced it down to a exactly what line causes the problem, but have not figure out why. So, I wanted to create a session bean to keep track of the input values from a form.
A slimmed down version of the code is:
public class rrpInputField {
public boolean isRequired;
public int maxLength;
public String inputValue;
public String displayValue;
public String formatMask;
public rrpInputField() {
isRequired = false;
maxLength = 64;
inputValue = "";
displayValue = "";
formatMask = "";
}
}
I then created a interface dohicky...
#Local
public interface Test1 {
public void setAction(String action);
public String getAction();
public void setName(String name);
public String getName();
}
Then I created the test bean itself...
#Stateful
public class Test1Bean implements Test1 {
private String action;
private rrpInputField name;
#PostConstruct
public void initialize() {
action = "initalValue";
//name.currentValue = "TestValue";
#Override
public void setAction(String action){ this.action = action; }
#Override
public void getAction() { return this.action; }
#Override
public void setName(String name) { this.name.currentValue = name; }
#Override
public String getName() { return this.name.currentValue; }
}
In my test servlet I have
#EJB
private Test1 t1;
If I un-comment the one line in the bean initialize method in the bean definition I get the failure. So I know it has something to do with that.
//name.currentValue = "TestValue";
If I leave it commented out, as soon as I code t1.getName("New Value") in the servlet I'll get the same error.
If I leave it commented it out, then the bean works as anticipated - I can initialize, and use setAction and getAction just fine.
I am fairly sure the rrpInput class is correct, because I can code in the servlet:
rrpInputField f1 = new rrpInputField();
f1.currentValue = "TestValue";
I figure it must have something to do with my input field class, but I have had no luck figuring out what.
I really don't understand why, but I got it to work by adding a "new" thingie tin the initialize method of the Table1Bean.
#PostConstruct
public void initialize() {
action = "initialValue";
name = new rrpInputField();
name.currentVAlue = "TestValue;
}
If someone could explain why I had to do this, it would be illuminating.
I am not being able to make messageSource work in the Pojo classes,its throwing a nullpointerexception. However in all the other classes namely controller,service messageSource is working alright. Could someone please suggest what needs to be done ?
#Autowired
private MessageSource messageSource;
I have autowired the MessageSource using the above code snippet.
public class ProposalWiseSelectionForm implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
#Autowired
private MessageSource messageSource;
private String txtPageHierarchy="";
private String txtLineOfBusiness;
private String txtProduct;
private String btn;
private String clickedGo="N";
private List arrLineOfBusiness=new ArrayList();
private List arrProduct=new ArrayList();
#Valid
private ArrayList documentList=initiateDocumentList();
private String txtPageMode="I";
private String enableDiscardBtn="N";
private String enableInsertBtn="N";
private String isDivVisible="N";
private int numApplicationType=1;
public ProposalWiseSelectionForm() {
}
public String getTxtPageHierarchy() {
return txtPageHierarchy;
}
public void setTxtPageHierarchy(String txtPageHierarchy) {
this.txtPageHierarchy = txtPageHierarchy;
}
public String getTxtLineOfBusiness() {
return txtLineOfBusiness;
}
public void setTxtLineOfBusiness(String txtLineOfBusiness) {
this.txtLineOfBusiness = txtLineOfBusiness;
}
public String getTxtProduct() {
return txtProduct;
}
public void setTxtProduct(String txtProduct) {
this.txtProduct = txtProduct;
}
public String getBtn() {
return btn;
}
public void setBtn(String btn) {
this.btn = btn;
}
public String getClickedGo() {
return clickedGo;
}
public void setClickedGo(String clickedGo) {
this.clickedGo = clickedGo;
}
public List getArrLineOfBusiness() {
return arrLineOfBusiness;
}
public void setArrLineOfBusiness(List arrLineOfBusiness) {
this.arrLineOfBusiness = arrLineOfBusiness;
}
public List getArrProduct() {
return arrProduct;
}
public void setArrProduct(List arrProduct) {
this.arrProduct = arrProduct;
}
public void setArrProduct(ArrayList arrProduct) {
this.arrProduct = arrProduct;
}
public ArrayList getDocumentList() {
return documentList;
}
public void setDocumentList(ArrayList documentList) {
this.documentList = documentList;
}
public String getTxtPageMode() {
return txtPageMode;
}
public void setTxtPageMode(String txtPageMode) {
this.txtPageMode = txtPageMode;
}
public String getEnableDiscardBtn() {
return enableDiscardBtn;
}
public void setEnableDiscardBtn(String enableDiscardBtn) {
this.enableDiscardBtn = enableDiscardBtn;
}
public String getEnableInsertBtn() {
return enableInsertBtn;
}
public void setEnableInsertBtn(String enableInsertBtn) {
this.enableInsertBtn = enableInsertBtn;
}
public String getIsDivVisible() {
return isDivVisible;
}
public void setIsDivVisible(String isDivVisible) {
this.isDivVisible = isDivVisible;
}
public int getNumApplicationType() {
return numApplicationType;
}
public void setNumApplicationType(int numApplicationType) {
this.numApplicationType = numApplicationType;
}
}
In order to be able to use #Autowired in a class, that class has to be managed by Spring.
of
Your ProposalWiseSelectionForm class is obviously not managed by Spring and therefor messageSource is always null.
Using #Autowired MessageSource messageSource in your other classes works, because as you mention those classes are managed by Spring (as you have mentioned they are either controllers, services etc).
I am guessing that ProposalWiseSelectionForm is a DTO used to capture values from a form. The sort of class will not be a Spring bean and therefor you can't autowire stuff into it.
I suggest you either move the logic you need out of the DTO and into the controller (or some Spring managed utility) or in the extreme case that you absolutely need #Autowired in the DTO, take a look at #Configurable here and here
Try using #Component,you might be getting this issue because of the fact the Pojo class is not being recognized.
You have to make your class a Spring bean
Add #Component annotation to your class and add these 2 lines to your appContext.xml:
<context:component-scan base-package="com.<your-company-name>" />
<context:annotation-config />
Or just add the service in your beans section in the appContext.xml if you wish not to work with Spring component-scan feature.
I have followed a tutorial on dynamic datasource routing tutorial in Spring. For that I have to extend AbstractRoutingDataSource to tell spring which datasource to get, so I do:
public class CustomRouter extends AbstractRoutingDataSource {
#Override
protected Object determineCurrentLookupKey() {
return CustomerContextHolder.getCustomerType();
}
}
Everything goes fine till I find the class responsible for keeping the value of the customerType (it should be the same during the whole session):
public class CustomerContextHolder {
private static final ThreadLocal<Integer> contextHolder = new ThreadLocal<Integer>();
public static void setCustomerType(Integer customerType) {
contextHolder.set(customerType);
}
public static Integer getCustomerType() {
return (Integer) contextHolder.get();
}
public static void clearCustomerType() {
contextHolder.remove();
}
}
This creates a thread-bound variable customerType, but I have a web application with spring and JSF I don't think with threads but with sessions. So I set it in the login page with thread A (View), but then thread B (Hibernate) request the value to know what datasource to use, it is null indeed, because it has a new value for this thread.
Is there any way to do it Session-bounded instead of Thread-bounded?
Things I have tried so far:
Inject the CustomRouter in the view to set it in the session: Not working, it causes a cycle in dependecies
Replace the ThreadLocal with an Integer: Not working, the value is always set by the last user logged in
Is FacesContext.getCurrentInstance() working? If so then you may try with this:
public class CustomerContextHolder {
private static HttpSession getCurrentSession(){
HttpServletRequest request = (HttpServletRequest)FacesContext.getCurrentInstance()
.getExternalContext().getRequest();
return request.getSession();
}
public static void setCustomerType(Integer customerType) {
CustomerContextHolder.getCurrentSession().setAttribute("userType", customerType);
}
public static Integer getCustomerType() {
return (Integer) CustomerContextHolder.getCurrentSession().getAttribute("userType");
}
public static void clearCustomerType() {
contextHolder.remove(); // You may want to remove the attribute in session, dunno
}
}