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Solution for no connections available for: Discussion Forum oracle.webcenter.collab.share.NotFoundException

Requirement- I am working on webcenter spaces application. I am getting this error in spaces server log.Why i am getting this.

error look like –

 <oracle.webcenter.collab.announcement.view.backing.AnnouncementUtil> <WCS-04014> <no connections available for: Discussion Forum
oracle.webcenter.collab.share.NotFoundException: no connections available for: Discussion Forum
        at oracle.webcenter.collab.share.SessionFactoryUtils.lookupConnectionNames(SessionFactoryUtils.java:121)
        at oracle.webcenter.collab.share.SessionFactoryUtils.findDefaultConnection(SessionFactoryUtils.java:172)
        at oracle.webcenter.collab.announcement.view.backing.AnnouncementUtil.doExtAppCheck(AnnouncementUtil.java:196)
        at oracle.webcenter.collab.announcement.view.backing.AnnouncementActionHandler.doInitializeMiniView(AnnouncementActionHandler.java:139)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.el.parser.AstValue.invoke(Unknown Source)
        at com.sun.el.MethodExpressionImpl.invoke(Unknown Source)

Solution – I don’t want this error in my log.And in my spaces application , i am using custom task flow and using as jar in webcenter spaces application.I am not using discussion service.Why we getting that.

By default if you installed WebCenter Spaces, you should have already 3 other Managed Servers like WC_Collab WC_Utils and WC_Portlets, start WC_Collab (or WC_Collaboration in > 11.1.1.6).By default WebCenter Spaces is expecting a discussion connection since most of the spaces templates require discussion services, but if you created your own Space Template you should not face this error.Also you should be able to configure the WebCenter Spaces with Discussion even if you are not willing it, since it already comes with the WebCenter installation, so solution will be creating the discussion connection in Enterprise manager (EM).

-> Start WC_Collaboration server in weblogic console as depicted in picture below –

wc_colloboration1

-> In Linux navigate under oracle home with following path –
oracle/Middleware/user_projects/domains/ucm_domain/bin/
Use this command – cd oracle/Middleware/user_projects/domains/ucm_domain/bin/
And run this command – ./startManagedWebLogic.sh WC_Colloaboration
-> Please hit url i.e. http://ipaddress:8890/owc_discussions , if you see page of community forum like below, that specify ,server for WC_Colloaboration is running

-> Login into http://ipaddress:7001/em as weblogic
-> Expand webcenter and then webcenter spaces and right click, select service configuration.

serviceConfiguration1

-> Select Discussion and Announcement

discussion1

-> Click Add and fill information as below

AddConnection

-> Please checked Active Connection checkbox and restart server.
-> Run OCC application, discussion forum error will not come again.

That is all. we are done

BTW , this is 300 post of Techartifact… long way to go… thanks everyone for supporting…

happy learning with Vinay in techartifact…

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How to check ifdirty (is modified) for View Object?

Requirement – Checking if data modified in viewobject ADF

Solution-You can use isDirty() method provided by API to get status 

 DCBindingContainer bind =(DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
        JUCtrlHierBinding object = (JUCtrlHierBinding)bind.findCtrlBinding("DepartmentVO1"); // or get ViewObject form Iterator in ADFUtils.
        ViewObject deptVo = object.getViewObject(); 
        Boolean b = deptVo.getApplicationModule().getTransaction().isDirty();This gives Boolean value of True/False.

another way

DCBindingContainer dcBindingContainer=(DCBindingContainer)
BindingContext.getCurrent().getCurrentBindingsEntry();
if(dcBindingContainer.getDataControl().isTransactionModified()){
//Code goes here...
}

few more use case i found on internet i.e http://oracleadfhowto.blogspot.de/2012/03/iterator-uncommitted-data-availability.html, so thought of sharing that as well –

1. If you are using iterator based UI component like table:
Expression #{row.row.entities[0].entityState} will return state viz. (0 – New, Modified – 2, Unmodified – 1, Initialized – -1 where row refers to the table node and row.row is the instance of row in the iterator/table.

The following expression also notify that there is dirty data available –

-> #{!bindings.EmployeesView1Iterator.dataControl.TransactionDirty}   // this statment will notify that there is uncommitted or unsaved data in the iterator
-> #{!bindings.Commit.enabled}
-> #{!controllerContext.currentRootViewPort.dataDirty}
-> #{!controllerContext.currentViewPort.dataDirty}

Happy ADF learning with Vinay in techartifact….

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How to Read/convert an InputStream to a String

There are multiple ways .I will list down few of them.

Using Old and standard java solution –

public static String fromStream(InputStream in) throws IOException
{
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    StringBuilder out = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
        out.append(line);
    }
    return out.toString();
}

return sb.toString();

if you using Google-Collections/Guava-

InputStream stream = ...
String content = CharStreams.toString(new InputStreamReader(stream, Charsets.UTF_8));
Closeables.closeQuietly(stream);

If you can use Apache Common library..then this is useful –

StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, encoding);
String theString = writer.toString();

Quick way but only work in deserialization process –

String result = (String)new ObjectInputStream( inputStream ).readObject();

Note:ObjectInputStream is about deserialization, and the stream have to respect the serialization protocol to work, which may not always true in all cases.

In the end, the most efficient solution and only in two lines using java Scanner class –

Tricky is to remember the regex \A, which matches the beginning of input. This effectively tells Scanner to tokenize the entire stream, from beginning to (illogical) next beginning.

public static String convertToString(InputStream in) {
    java.util.Scanner s = new java.util.Scanner(in).useDelimiter("\\A");  
        
    return s.hasNext() ? s.next() : "";
}

I would love to hear any comment by you for making more simple…

Happy learning by Vinay Kumar in techartifact