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<h1>Frequently Asked Questions</h1>
<div id="minitoc-area">
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<li>
<a href="#Questions">Questions</a>
<ul class="minitoc">
<li>
<a href="#general_questions">1. General Questions</a>
<ul class="minitoc">
<li>
<a href="#next_version">1.1.
When will the next version of PDFBox be released?
</a>
</li>
<li>
<a href="#log4j_config">1.2.
I am getting the below Log4J warning message, how do I remove it?
</a>
</li>
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<a href="#pdfbox_threadsafe">1.3.
Is PDFBox thread safe?
</a>
</li>
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<a href="#pdfbox_close_warning">1.4.
Why do I get a "Warning: You did not close the PDF Document"?
</a>
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</ul>
</li>
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<a href="#text_extraction">2. Text Extraction</a>
<ul class="minitoc">
<li>
<a href="#no_text_extraction">2.1.
How come I am not getting any text from the PDF document?
</a>
</li>
<li>
<a href="#gibberish_text">2.2.
How come I am getting gibberish(G38G43G36G51G5) when extracting text?
</a>
</li>
<li>
<a href="#cant_handle_font_width">2.3.
What does "java.io.IOException: Can't handle font width" mean?
</a>
</li>
<li>
<a href="#no_permission">2.4.
Why do I get "You do not have permission to extract text" on some documents?
</a>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<a name="N10007"></a><a name="Questions"></a>
<h2 class="boxed">Questions</h2>
<div class="section">
<a name="N1000B"></a><a name="general_questions"></a>
<h3 class="boxed">1. General Questions</h3>
<a name="N1000F"></a><a name="next_version"></a>
<h4 class="faq">1.1.
When will the next version of PDFBox be released?
</h4>
<div align="right">
<a href="#next_version-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
As fixes are made and integrated into CVS these changes are documented in the
<a href="../changes.html">release notes</a>. I will give an estimate of when
the next version will be released. <br>
<br>
Of course, this is only an estimate and could change.
</p>
</div>
<a name="N1001E"></a><a name="log4j_config"></a>
<h4 class="faq">1.2.
I am getting the below Log4J warning message, how do I remove it?
</h4>
<div align="right">
<a href="#log4j_config-menu">^</a>
</div>
<div style="margin-left: 15px">
<table class="ForrestTable" cellspacing="1" cellpadding="4">
<tr>
<td colspan="1" rowspan="1">
log4j:WARN No appenders could be found for logger (org.pdfbox.util.ResourceLoader).<br>
log4j:WARN Please initialize the log4j system properly.
</td>
</tr>
</table>
<p>
This message means that you need to configure the log4j logging system.
See the <a href="http://logging.apache.org/log4j/docs/documentation.html">log4j documentation</a> for more information.
</p>
<p>
PDFBox comes with a sample log4j configuration file. To use it you set a
system property like this
</p>
<p>
java -Dlog4j.configuration=log4j.xml org.pdfbox.ExtractText <PDF-file> <output-text-file>
</p>
<p>
If this is not working for you then you may have to specify the log4j config file using a URL path, like this:<br>
<br>
log4j.configuration=file:///<path to config file><br>
<br>
Please see <a href="https://sourceforge.net/forum/forum.php?thread_id=1254229&forum_id=267205">this</a> forum thread for more information.
</p>
</div>
<a name="N1004A"></a><a name="pdfbox_threadsafe"></a>
<h4 class="faq">1.3.
Is PDFBox thread safe?
</h4>
<div align="right">
<a href="#pdfbox_threadsafe-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
No! Only one thread may access a single document at a time.
You can have multiple threads each accessing there own PDDocument object.
</p>
</div>
<a name="N10052"></a><a name="pdfbox_close_warning"></a>
<h4 class="faq">1.4.
Why do I get a "Warning: You did not close the PDF Document"?
</h4>
<div align="right">
<a href="#pdfbox_close_warning-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
You need to call close() on the PDDocument inside the finally block, if you
don't then the document will not be closed properly. Also, you must close all
PDDocument objects that get created. The following code creates <b>two</b>
PDDocument objects; one from the "new PDDocument()" and the second by the load method.
</p>
<pre>
PDDocument doc = new PDDocument();
try
{
doc = PDDocument.load( "my.pdf" );
}
finally
{
if( doc != null )
{
doc.close();
}
}
</pre>
</div>
<a name="N10060"></a><a name="text_extraction"></a>
<h3 class="boxed">2. Text Extraction</h3>
<a name="N10064"></a><a name="no_text_extraction"></a>
<h4 class="faq">2.1.
How come I am not getting any text from the PDF document?
</h4>
<div align="right">
<a href="#no_text_extraction-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
Text extraction from a pdf document is a complicated task and there are many factors
involved that effect the possibility and accuracy of text extraction. It would be helpful
to the PDFBox team if you could try a couple things.
</p>
<ul>
<li>Open the PDF in Acrobat and try to extract text from there. If Acrobat can extract text
then PDFBox should be able to as well and it is a bug if it is not. If Acrobat cannot extract text then
PDFBox 'probably' cannot either.</li>
<li>It might really be an image instead of text. Some PDF documents are just images that have
been scanned in. You can tell by using the selection tool in Acrobat, if you can't select
any text then it is probably an image.</li>
</ul>
</div>
<a name="N10075"></a><a name="gibberish_text"></a>
<h4 class="faq">2.2.
How come I am getting gibberish(G38G43G36G51G5) when extracting text?
</h4>
<div align="right">
<a href="#gibberish_text-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
This is because the characters in a PDF document can use a custom encoding
instead of unicode or ASCII. When you see gibberish text then it
probably means that a meaningless internal encoding is being used. The
only way to access the text is to use OCR. This may be a future
enhancement.
</p>
</div>
<a name="N1007D"></a><a name="cant_handle_font_width"></a>
<h4 class="faq">2.3.
What does "java.io.IOException: Can't handle font width" mean?
</h4>
<div align="right">
<a href="#cant_handle_font_width-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
This probably means that the "Resources" directory is not in your classpath. The
Resources directory is included in the PDFBox jar so this is only a problem if you
are building PDFBox yourself and not using the binary.
</p>
</div>
<a name="N10085"></a><a name="no_permission"></a>
<h4 class="faq">2.4.
Why do I get "You do not have permission to extract text" on some documents?
</h4>
<div align="right">
<a href="#no_permission-menu">^</a>
</div>
<div style="margin-left: 15px">
<p>
PDF documents have certain security permissions that can
be applied to them and two passwords associated with them, a user password and a master password.
If the "cannot extract text" permission bit is set then you need
to decrypt the document with the master password in order to extract the text.
</p>
</div>
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