Detect File Format & Throw UnsupportedFileFormatException when Opening an Invalid PDF File with Aspose.Words for .NET C# API

Aspose.Words Product Family
1

Hi
We’re having some unit tests which ran through without trouble on
the Aspose.Words 10 BETA version but have one that fails in 10.0.1:
When we do:

new AsposeWordFile(getClass().getResourceAsStream("/some.pdf"));

We’d expect an IOException because that file is no valid DOC (it’s a valid PDF), but instead we get:

java.lang.Exception: Unexpected exception, expected <java.io.IOException> but was <java.util.ServiceConfigurationError>
Caused by: java.util.ServiceConfigurationError: java.nio.charset.spi.CharsetProvider: Provider com.aspose.ms.java.utf7charset.provider.CharsetProvider not found
at java.util.ServiceLoader.fail(ServiceLoader.java:231)
at java.util.ServiceLoader.access$400(ServiceLoader.java:181)
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:367)
at java.util.ServiceLoader$1.next(ServiceLoader.java:438)
at java.nio.charset.Charset$1.getNext(Charset.java:338)
at java.nio.charset.Charset$1.hasNext(Charset.java: 351)
at java.nio.charset.Charset$2.run(Charset.java: 394)
at java.nio.charset.Charset$2.run(Charset.java: 392)
at java.security.AccessController.doPrivileged(Native Method)
at java.nio.charset.Charset.lookupViaProviders(Charset.java: 391)
at java.nio.charset.Charset.lookup2(Charset.java: 468)
at java.nio.charset.Charset.lookup(Charset.java: 456)
at java.nio.charset.Charset.forName(Charset.java: 521)
at asposewobfuscated.rv.pl(Encoding.java: 502)
at asposewobfuscated.rv.pi(Encoding.java: 468)
at asposewobfuscated.rv.a(Encoding.java: 452)
at asposewobfuscated.rv.m(Encoding.java: 392)
at com.aspose.words.pa.a(FileFormatDetector.java: 318)
at com.aspose.words.pa.aN(FileFormatDetector.java: 304)
at com.aspose.words.pa.A(FileFormatDetector.java: 44)
at com.aspose.words.Document.b(Document.java: 1108)
at com.aspose.words.Document.a(Document.java: 1084)
at com.aspose.words.Document.(Document.java: 194)
at com.aspose.words.Document.(Document.java: 165)
at com.aspose.words.Document.(Document.java: 160)

Could you have a look at it?
Thanks

Matt Keller

2

Hi
Thanks for your request. I managed to reproduce the problem on my side. You are right, there should be UnsupportedFileFormatException. I logged this problem into our defect database. We will let you know once it is resolved.
Best regards,

3

Thanks
But please either throw some subclass of IOException (preferred) or clearly document that new exception in the javadoc and release notes.
The current javadoc states:
Throws:

IOException - if the stream could not be read or does not contain a Word document

Thanks
Matt

4

Hi Matt,
Thanks for your request. Andrey is right – UnsupportedFileFormatException should be thrown. Please see the following link for more details:
https://reference.aspose.com/words/java/com.aspose.words/unsupportedfileformatexception/
Since Aspose.Words does not support PDF as input document format – this type of exception should be thrown.
Best regards,

5

That’s okay with me, just as long as this exception is clearly documented in the javadoc and method signature.
Thanks
Matt

6

The issues you have found earlier (filed as WORDSJAVA-7) have been fixed in this .NET update and in this Java update.

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