Taskflow Method call receiving null parameter.

Hi all,
I am using 11.1.1.6. I have created in my application an extra project which is pure Java objects and exposed a master class as a POJO DC. In my application, I have a taskflow where I have dragged and dropped one method from my POJO DC - 2 of the parameters of this methods are coming from an application scope bean. I have debugged the application, and made sure that the object being returned by the getter of my app scope bean is not null. So basically, when the breakpoint is in the return statement of my getter the oject is not null and it has been correctly initialized. Just after that, the next breakpoint is in the class receiving the parameter in my POJO DC class. In there, the object is NULL.
Does anyone knows wat could be the reason??

Hi Frank Nimphius-Oracle,
That is precisely the problem. The object is being passed as to the taskflow as an input parameter (getting it from my application scope bean). If I access the pageFlowScope inside my taskflow I see it and its there, correctely intialized. However, when I call a method call activity that consumes that object as parameter, all what it gets is null.
The method that consumes this object is in a separate project, and its exposed in a POJO DC. I don't know if it has to be with the complexity of the object I am passing or what but I don't understand why its not being passed correctly to the DC Method.

Similar Messages

Why are static methods called with null references,valid ?

This is my code :
package inheritance;
public class inh6{
     public static void method(){
     System.out.println("Called");
     public static void main(String[] args){
          inh6 t4 = null;
     t4.method();
O/P :
CalledHere t4 is a null reference and yet we are able to call a method on it,why is null pointerexception not thrown.Why are we able to call static methods using null references ?
t4 is null means it doesnot refer to any memeory address,hence how is method() called correctly.
I hope i am clear. :)
Thank you for your consideration.

punter wrote:
jverd wrote:
Memory addresses have nothing to do with it. I doubt memory addresses are even mentioned once in the JLS.
By memory address i mean the memory location the reference is pointing to.I know what you mean. But if you think it's relevant, can you show me where in the JLS it says anything about memory locations?
>
You can do that because a) t4's type is "reference to inh6" and b) method() is declared static, which means that you don't need an object to call it, just the class. That class comes from the compile time type of t4. The fact that t4 is null at runtime is irrelevant.
So at compile time the type of t4 is inh6 and hence the method is called.Is it ? Had method() not been static a NullPointerException would have been thrown.Correct.
With non-static, non-private, non-final methods, which implementation of the method gets called is determined at runtime, buy the class of the object on which it's being called. If any one of those "non"s goes away, then the method is entirely determined at compile time, and in the case of static methods, there's no instance necessary to call the method in the first place.

Why is my JavaServiceFacade persist() method is receiving NULL object

My jDeveloper version is 11.1.1.3.0
I have a jspx in which i want to save an employee into my DB on the click of submit button.
I have made an entity object(Employee.java) made from a table EMPLOYEE. I then exposed this entity bean using a JavaServiceFacade. This JavaServiceFacade class has a method with signature persistEmployee(Employee employee).
In my UI, i have made made a Submit button by dragging the persistEmployee() method from my DataControls pallette to my jspx, and the actionListener binding for this is ="#{bindings.persistEmployees.execute}".
Now when i click on the submit button, the persistEmployee() method throws an exception which is below...
______ java.lang.IllegalArgumentException: Object: null is not a known entity type_______
I found that the persistEmployee() method is not receiving an Employee object as an argument due to which this error is thrown.
Can somebody pls guide me on what could be the issue.
BELOW ISTHE CODE WHICH I HAVE USED.
.......button code in my jsp.......
<af:commandButton text="Submit"
binding="#{backing_LdapUserCreation.cb5}"
id="cb5"
actionListener="#{bindings.persistEmployees.execute}"
disabled="#{!bindings.persistEmployees.enabled}"/>
.......method code which got generated in teh javaservicefacade..(here the employee argument received by the first line is NULL).....
public Employees persistEmployees(Employees employees) {
System.out.println("IS employees NULL ? = "+employees);
return (Employees)_persistEntity(employees);
.......binding code in my pagedefinition.........
<methodAction id="persistEmployees" RequiresUpdateModel="true"
Action="invokeMethod" MethodName="persistEmployees"
IsViewObjectMethod="false" DataControl="EmployeeService"
InstanceName="EmployeeService.dataProvider"
ReturnName="EmployeeService.methodResults.persistEmployees_EmployeeService_dataProvider_persistEmployees_result">
<NamedData NDName="employees" NDType="model.test.Employees" />
</methodAction>

Hi,
when you dragged the persist method from the DataControls panel, a dialog opens that in its lower area shows the argument that the method expects. This argument needs to be pointed to <iterator name> | currentRow | data provider. To do this, click into the method argument value field and click the button on its right to bring up the EL editor. Then expand the iterator node under the Bindings node. Expand currentRow and select dataProvider.
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Frank

Databind method call returns null in WebCenter Content Filter

Hi,
I have inherited some code that has an issue and I'm new to WebCenter Content and the Filters that can be added. We have a FileNameFilter class that starts off with the code
public class CWEFileNameFilter implements FilterImplementor {
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However, service sometimes comes back null and then the filter throws a NPE.
My questions are:
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Thanks
Marc

Hi Marc,
Below code will give service name for which filter is implemented from LocalData
String service = dataBinder.getLocal("IdcService");
for example below
http://localhost:16200/cs/idcplg?IdcService=DOC_INFO_BY_NAME&dDocName=1111111&IsJava
This will print entire response data including localdata and results which are created as part of service execution. Below is snippet
<?hda version="11.1.1.8.0PSU-2015-04-01 00:14:53Z-r126309" jcharset="UTF8" encoding="utf-8"?>
@Properties LocalData
DocUrl=https://localhost:16200/cs/weblayout/groups/secure/documents/test/mhdk/mjg1/1111111.pdf
IdcService=DOC_INFO_BY_NAME
so String service = dataBinder.getLocal("IdcService"); will be service ="DOC_INFO_BY_NAME".
Below blog will give some idea about filter but best place to learn or start is "The Definitive Guide to Stellent Content Server Development" by Brian Huff
http://www.redstonecontentsolutions.com/technical-blog/ucm-service-handlers-and-javafilters
Also i would recommend reading "WebCenter Content Services Reference Guide"
http://docs.oracle.com/cd/E23943_01/doc.1111/e11011/toc.htm
Regards,
Amol Gavali.

How can i call a taskflow methode from backing bean ??

Build JDEVADF_11.1.1.3.PS2_GENERIC_100408.2356.5660
i like to call a Methode (taskflow) from backing bean!
my bean code :
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<?xml version="1.0" encoding="windows-1252" ?>
<adfc-config xmlns="http://xmlns.oracle.com/adf/controller" version="1.2">
<task-flow-definition id="map-task-flow">
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</task-flow-definition>
</adfc-config>

Hi,
to call the bean, use the EL in Java and reference #{backingBeanScope.mapBean.initMap} as a method expression. If you try and access the bean directly then chances are that the instance is not available. Using EL from Java always guarantees this
Frank

Problem calling a method which takes a parameter from a table

Hi guys,
I'm very new to jsf and hope you can help me out.
On my page i'm generating a list, which is working fine. now i want to add some commandLinks to the list entries. on click, i want to execute a bean method, which takes a parameter from the list, generates a picture and displays it on my page.
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use actionlistener.
here a typical code that works fine for me:
(JSF 1.2)
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EL - How do you call a method that requires a parameter

How do you call a method that requires a parameter
In scriplet code here is what I am trying to do
<%= car.getDefaultColor(car.getCarType()) %>
How do I do this in EL
Here is my guess (it generates the Exception described below)
${car.defaultColor(car.carType)}
Here is the Exception I am getting:
javax.servlet.ServletException: <h3>Validation error messages from tag library c</h3>tag = 'out' / attribute = 'value': An error occurred while parsing custom action attribute "value" with value "${car.defaultColor(car.carType)}": Encountered "(", expected one of ["}", ".", ">", "gt", "<", "lt", "==", "eq", "<=", "le", ">=", "ge", "!=", "ne", "[", "+", "-", "*", "/", "div", "%", "mod", "and", "&&", "or", "||"]
Any Ideas?
P.S. If it matters to you, I am using JSTL 1.0 and the code snippets above are actually within the value attribute of a <c:out value="" /> statement.

How do you call a method that requires a parameter
In scriplet code here is what I am trying to do
<%= car.getDefaultColor(car.getCarType()) %>
How do I do this in ELYou don't. EL is very strict in method signatures. All get methods must be public Type getProperty(void); And all set methods must be public void setProperty(Type t);
So you will have to re-work your Bean so it does not need an argument to the get method (getDefaultColor()). Since you are calling another method out of car, you might re-write the getDefaultColor method as such:
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private CarType curCarType;
public void setCurrentCarType(CarType ct) { curCarType = ct; }
public Object getDefaultColor() {
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Here is my guess (it generates the Exception
described below)
${car.defaultColor(car.carType)}
Here is the Exception I am getting:
javax.servlet.ServletException: <h3>Validation error
messages from tag library c</h3>tag = 'out' /
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custom action attribute "value" with value
"${car.defaultColor(car.carType)}": Encountered "(",
expected one of ["}", ".", ">", "gt", "<", "lt",
"==", "eq", "<=", "le", ">=", "ge", "!=", "ne", "[",
"+", "-", "*", "/", "div", "%", "mod", "and", "&&",
"or", "||"]
Any Ideas?
P.S. If it matters to you, I am using JSTL 1.0 and
the code snippets above are actually within the value
attribute of a <c:out value="" /> statement.

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Hi guys,
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Let me tell us the details of :
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Thanks for help for this strange behaviour

Hi
create a temp calculated column
=IF(ISBLANK([Duration]),"",[Item Start Date]+([Duration])
and check if it's working OK
Romeo Donca, Orange Romania (MCSE, MCITP, CCNA) Please Mark As Answer if my post solves your problem or Vote As Helpful if the post has been helpful for you.

System call failed. Error 2 (The system cannot find the file specified. ) in execution of system call 'CreateProcessAsUser' with parameter ( , NULL, Program Files/sapinst_instdir/BS2011/ERP606/AS-ABAP/SYB/HA/DB, &StartupInfo, &ProcessInfo),

Dear All,
I am getting a below error while doing ehp6 installation on sybase (high availbility )
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Hello Mauricio.
Thanks
Two Thinks:
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Static method called from a null object reference

Hello folks,
Here´s the code:
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sometimes wrote:
yawmark wrote:
Calling static methods from a reference variable should be considered a bad practice. Our coding standards prohibit it, and I suspect we're not the only ones.
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Its done i am able to connect.

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Hi All,
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'C:\Program Files\Microsoft\Exchange Server\TransportRoles\Logs\Routing' -SendProtocolLogMaxAge '30.00:00:00' -SendProtocolLogMaxDirectorySize '250MB' -SendProtocolLogMaxFileSize '10MB' -SendProtocolLogPath 'C:\Program Files\Microsoft\Exchange Server\TransportRoles\Logs\ProtocolLog\SmtpSend'
-TransientFailureRetryCount '6' -TransientFailureRetryInterval '00:10:00'
New-AcceptedDomain -DomainName 'xxx' -DomainType 'Authoritative' -Name 'xxx'
Set-AcceptedDomain -DomainType 'Authoritative' -AddressBookEnabled:$true -Name 'xxx'
Importing Edge configuration information Failed.
Reason: You cannot call a method on a null-valued expression.

MuseJSAssert: ... TypeError: Cannot call method 'getElementsByTagName' of null

This is the error that I get when I open our site.
MuseJSAssert: Error calling selector function:TypeError: Cannot call method 'getElementsByTagName' of null
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I tried uploading from scratch on to a new bc test site:
expertly.businesscatalyst.com
Dont worry about the Edge videos that works fine.
When you click on Online or Offline (on the left hand side) this error shows up.
And then the accordian wigs out.
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There seems to be a Javascript error with the "ss-form" HTML that has been inserted. Specifically, this part:
var divs = document.getElementById('ss-form').
getElementsByTagName('div');
I believe (though I'm not sure), that changing it to
var divs = document.getElementById('ss-form').getElementsByTagName('div');
All on one line will solve the problem. Unfortunately this is beyond the scope of Muse, as it is code that has been inserted. You made need to check with the source you found the inserted code from.
Thanks,
Colby

Apply template but it show "cannot call method 'getAttribute' of null"

i created a shared template first.
my steps:
1. created a datamodel as 'sales'
2. created a report using 'sale' datamodel
3. created a new layout ,put my data into the page, and saved the new layout as 'my layout 1'.
4. saved the report as 'Boilerplates' and placed it undel /my folders.
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now i create another datamodel as 'teu',
and then create another report using 'teu' datamodel,
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can anyone help me?
thanks,
newkoa

The Code tool is realy useful for putting the script in a readable format.
This isnt' a great location for generic, non SharePoint, PowerShell questions. A lot of us know it back to front but the hey Scripting guy forum is much faster than we are here.
That error message is actually very descriptive. It's saying there is no invoke method on a null object, or in other words there isn't an object to operate on. Or to finally put it in English: There is no '$shellApplication' object that PowerShell knows
of.
At the moment I've no idea what you intended to do with the $zipPackage object but since it's not being used now i'd just comment that line out

Null reference method call behaving oddly

Hi all, and a very happy new year!!
My question concerns the null reference; simply, why does the following code chooses to call any other method than the Object version (try it out). No matter what type i choose to replace the current String version with... I have not paid much thought to this, but i would have guessed the null reference calls the Object version in such a situation.
If i leave only the Object method and comment out all others, the code compiles fine and calls the Object version at runtime - but in case there are sub class versions, those will be called. WHY?
(im running jre 1.4.1).
The code:
public class NullTest {
     public void method(Object o) {
          System.out.println("Object Version");
     public void method(String s) {
          System.out.println("String Version");
     public static void main(String args[]) {
NullTest nullTest = new NullTest();
          nullTest.method(null);
}

schapel, the question related specifically to
null, in a context where no runtime type can be
inferred. It wasn't about overloading in general.Yes, I understand that. But here is the rule from the JLS:
"If more than one method declaration is both accessible and applicable to a method invocation, it is necessary to choose one to provide the descriptor for the run-time method dispatch. The Java programming language uses the rule that the most specific method is chosen."
Note that it does not refer specifically to a null argument.
The question is "why is the most specific method called?" The reason is that there are only a few possibilities for this rule:
1. The least specific method should be called. In this case, overloaded methods with more specific types could not be called.
2. If there is more than one method, it is a compile time error. Again, this would cause overloading to be useless.
3. The most specific method is called. It is only with this rule that overloading works. That's why Java uses this rule.

Taskflow Method call receiving null parameter.

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