Unable to find a attachment using ContentHelper

[Kumar22]

Hi All

Inorder to download the attachment ContentServerHelper class is used, but the method is throwing null pointer exception.

Here the The ContentServerHelper.service.findContentStream(Applicationdata) throws null pointer exception.

Please find the below code snippet for reference

QuerySpec qs = new QuerySpec(wt.doc.WTDocument.class);

SearchCondition sc = new SearchCondition(wt.doc.WTDocument.class,"master>number","=","0000078558");

qs.appendWhere(sc);

QueryResult qr = PersistenceHelper.manager.find((wt.pds.StatementSpec)qs);

while(qr.hasMoreElements())

{

WTDocument wtp = (WTDocument)qr.nextElement();

ObjectReference or = ObjectReference.newObjectReference(wtp);

ContentItem holder = ContentHelper.service.getPrimaryContent(or);

if (holder!=null)

{

ApplicationData applicationdata = (ApplicationData)holder;

try {

String fName=applicationdata.getFileName();

System.out.println(fName);

InputStream inputstream = ContentServerHelper.service.findContentStream(applicationdata);

int i = 0;

String filepath="D:\\exportfiles";

File temp=new File(filepath+File.separator+fName);

String docfile = temp.getAbsolutePath();

FileOutputStream tout = new FileOutputStream(docfile);

byte abyte0[] = new byte[2048];

while ( (i = inputstream.read(abyte0, 0, abyte0.length)) >= 0)

{

tout.write(abyte0, 0, i);

}

tout.close();

} catch (WTException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

[satre-2]

you can use below API to get the attachment of WTDocument.

WTDocument document=null;

QueryResult attachments = ContentHelper.service.getContentsByRole(document, ContentRoleType.SECONDARY);

while (attachments.hasMoreElements()) {

ApplicationData appData = (ApplicationData) attachments.nextElement();

// String url = ContentHelper.getDownloadURL(document, appData).toString();

}

Hope this helps !!

Thanks,

Shreyas

[Kumar22]

Hi Shreyas

Using the code i am able to genarate a link which displays a sublink for downloading.The requirement to generate the link(sub link here) to download the attachment programtically.

Best Regards

Kumar

[SimonHeath]

You may need to use this API before you call the others

ContentHolder holder = ContentHelper.service.getContents(holder);

It sets some stuff up internally,

Simon

[Kumar22]

Hi Simon

As u say we have to set some stuff up internally as ContentServerHelper.service is just a interface .ContentHelper.service.getContents(holder); is not working and still throwing nullpointer.I tried ContentServerHelper.service.update method but i m not able to initialize it.

The above program throws a Warning

WARNING: The ManagerService is not initialized! This can be caused by:

1) Attempting to invoke a server only method from a remote client

2) Attempting to invoke a method on a service from the constructor or static initializer of another service

Exception in thread "main" java.lang.ExceptionInInitializerError

Is there anyway to initialize ContentServerHelper.service

Best Regards

Kumar