Interview Questions.

Top 100+ Pdfbox Interview Questions And Answers

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Top 100+ Pdfbox Interview Questions And Answers

Question 1. When Will The Next Version Of Pdfbox Be Released?

Answer :

As fixes are made and integrated into the repository those adjustments are documented inside the release notes. An estimate can be given of when the next model could be launched.

Question 2. Is Pdfbox Thread Safe?

Answer :

No! Only one thread may also access a single document at a time. You can have multiple threads each getting access to their personal PDDocument item.

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Question 3. How Come I Am Getting Gibberish(g38g43g36g51g5) When Extracting Text?

Answer :

This is because the characters in a PDF file can use a custom encoding as opposed to unicode or ASCII. When you spot gibberish textual content then it in all likelihood manner that a meaningless inner encoding is being used. The simplest way to get entry to the textual content is to apply OCR. This can be a destiny enhancement.

Question four. What Does "java.Io.Ioexception: Can't Handle Font Width" Mean?

Answer :

This probable manner that the "Resources" listing is not in your classpath. The Resources directory is protected inside the PDFBox jar so this is simplest a hassle in case you are constructing PDFBox yourself and now not the use of the binary.

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Question 5. Why Do I Get "you Do Not Have Permission To Extract Text" On Some Documents?

Answer :

PDF files have sure safety permissions that can be carried out to them and  passwords associated with them, a person password and a grasp password. If the "can not extract text" permission bit is ready then you definately want to decrypt the document with the master password with the intention to extract the text.

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Question 6. Can't We Just Extract The Text Without Parsing The Whole Document Or Extract Text As It Is Parsed?

Answer :

Not sincerely, for a pair motives.

If the file is encrypted then you need to parse as a minimum until the encryption dictionary earlier than you may decrypt.
Sometimes the PDFont carries crucial facts needed for text extraction.
Text on a page does now not ought to be drawn in analyzing order. For example; if the web page stated "Hello World", the pdf could have been written such that "World" gets drawn and then the cursor movements to the left and the phrase "Hello" is drawn.
Question 7. I Am Getting The Below Log4j Warning Message, How Do I Remove It?

Answer :

log4j:WARN No appenders will be found for logger (org.Apache.Pdfbox.Util.ResourceLoader).

Log4j:WARN Please initialize the log4j device well.

This message approach that you want to configure the log4j logging machine. See the log4j documentation for more information.

PDFBox comes with a sample log4j configuration document. To use it you put a system assets like this

java -Dlog4j.Configuration=log4j.Xml org.Apache.Pdfbox.ExtractText <PDF-file> <output-text-file>

If this isn't always running for then you you may have to specify the log4j config file using a URL path, like this:

log4j.Configuration=file:///<path to config file>

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Question eight. Why Do I Get A “warning: You Did Not Close The Pdf Document”?

Answer :

You need to name close() on the PDDocument in the subsequently block, in case you don’t then the file will now not be closed properly. Also, you must close all PDDocument items that get created. The following code creates two PDDocument gadgets; one from the “new PDDocument()” and the second by the burden method.

PDDocument document = new PDDocument();
attempt

   doc = PDDocument.Load( "my.Pdf" );

ultimately

   if( doc != null )
   
      doc.Near();
   


Question nine. How Come I Am Not Getting Any Text From The Pdf Document?

Answer :

Text extraction from a pdf document is a complex task and there are numerous factors concerned that impact the opportunity and accuracy of textual content extraction. It might be useful to the PDFBox group if you may try a pair matters.

Open the PDF in Acrobat and try to extract textual content from there. If Acrobat can extract textual content then PDFBox have to be able to as properly and it is a bug if it can not. If Acrobat cannot extract textual content then PDFBox ‘possibly’ can't either.
It would possibly actually be an image in preference to textual content. Some PDF documents are simply pix which have been scanned in. You can tell by the usage of the selection tool in Acrobat, if you may’t select any text then it is probably an photo.
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Question 10. What Does “java.Io.Ioexception: Can’t Handle Font Width” Mean?

Answer :

This possibly way that the “Resources” listing isn't on your classpath. The Resources directory is protected within the PDFBox jar so this is simplest a problem in case you are constructing PDFBox your self and not using the binary.

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Question eleven. Why Do I Get “you Do Not Have Permission To Extract Text” On Some Documents?

Answer :

PDF documents have sure safety permissions that may be implemented to them and  passwords associated with them, a user password and a grasp password. If the “cannot extract textual content” permission bit is ready then you definitely want to decrypt the report with the master password for you to extract the textual content.

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Question 12. Can’t We Just Extract The Text Without Parsing The Whole Document Or Extract Text As It Is Parsed?

Answer :

Not truly, for a pair reasons.

If the record is encrypted then you need to parse at least until the encryption dictionary earlier than you may decrypt.
Sometimes the PDFont carries crucial information wanted for textual content extraction.
Text on a web page does not need to be drawn in reading order. For example: if the page stated “Hello World”, the pdf could have been written such that “World” gets drawn after which the cursor movements to the left and the phrase “Hello” is drawn.
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