Anybody knows if it matters when the blobsize is bigger than 1 mb?
Because my "files" are a bit bigger than 1 mb, thats why i write the
blob with openWriteChannel and a for-loop in batches.
(and it does not fail at writing, even the file is created in the
folder "appengine-generated" at the development-system seems to be
correct)
The stack-trace sadly does not help me at all (atleast not me ...
maybe someone else finds the problem in the appengine source):
java.io.FileNotFoundException
at
com.google.appengine.api.files.FileServiceImpl.translateException(FileServiceImpl.java:
495)
at
com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:
479)
at
com.google.appengine.api.files.FileServiceImpl.open(FileServiceImpl.java:
412)
at
com.google.appengine.api.files.FileServiceImpl.openForRead(FileServiceImpl.java:
372)
at
com.google.appengine.api.files.FileServiceImpl.openForRead(FileServiceImpl.java:
363)
at
com.google.appengine.api.files.FileServiceImpl.openReadChannel(FileServiceImpl.java:
138)
...
As already said the file exists in my development-version, but sadly
tells me it doesn't read it with openReadChannel and just fails.
I guess thats why the blobstore is still "Experimental" for writing
files.
Maybe i have more luck with python?
But basically it should not matter on the programming language, or?
With python i would also loose alot of power of the gwt-framework :(
On Aug 28, 4:25 pm, "mr.dc" <[email protected]> wrote:
> Hello there ... i have a small problem reading blobs and i can't
> figure out whats the problem.
> So this is my part of the code (Java):
>
> FileService fileService = FileServiceFactory.getFileService();
> AppEngineFile file;
> file = fileService.getBlobFile(bkey);
> boolean lock = false;
> FileReadChannel readChannel = null;
>
> readChannel = fileService.openReadChannel(file, lock);
>
> The error i get is a FileNotFoundException at the openReadChannel
> function.
> I checked the BlobKey (bkey) and that key exists(thats why getBlobFile
> does not fail with that FileNotFoundException).
> I tried many possible ways, but just can't read the blob-files i write
> into the blobstore.
> Although it seems to create the blob files in the "appengine-
> generated" folder i have no luck at all to get the content of those
> files.
>
> The variable "bkey" gets loaded from an entry in a datastore(its kinda
> like a foreign key ).
> Not shure if that could create the problem but because
> fileService.getBlobFile does not fail i think thats not the problem.
>
> The problem appears online and localy ...
>
> Btw:
> Another problem happens at my online data viewer:
> I'm not able to see any new records for some reason, although i can
> read them through my application.
>
> Hope somebody of you can help me.
> (Sorry if there are still some writing-mistakes inside but english is
> not my main language)
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