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Re^2: Converting PDF file to text

by cerian (Novice)
on May 12, 2017 at 17:13 UTC ( [id://1190139]=note: print w/replies, xml ) Need Help??


in reply to Re: Converting PDF file to text
in thread Converting PDF file to text

Invoking java on the tika-app-1.14.jar from within perl works fine on my laptop, but not on web site this thing is for. It generates the following trace:
Exception in thread "main" java.lang.ClassFormatError: org.apache.tika.cli.TikaCLI (unrecognized class file version)
   at java.lang.VMClassLoader.defineClass(libgcj.so.10)
   at java.lang.ClassLoader.defineClass(libgcj.so.10)
   at java.security.SecureClassLoader.defineClass(libgcj.so.10)
   at java.net.URLClassLoader.findClass(libgcj.so.10)
   at java.lang.ClassLoader.loadClass(libgcj.so.10)
   at java.lang.ClassLoader.loadClass(libgcj.so.10)
   at gnu.java.lang.MainThread.run(libgcj.so.10)
I've been attempting to work with the Apache::Tika, Apache::Tika::Asynch, and Apache::Tika::Server modules; but without success. The only documentation I have found for them so far is the brief synopsis section on CPAN. Sadly, those contain errors. Do you have any additional documentation or working code snippets? I have yet to make one of these critters work. Examples of what I've tried are below:

Attempt 1: Apache::Tika
use Apache::Tika; my $tika = Apache::Tika->new(); open my $fh, '<:raw', 'x.pdf'; my $pdf = do { local $/; <$fh> }; close $fh; my $text = $tika->tika($pdf); print "$text\n";
The value in $text is:
Can't connect to localhost:9998 (Connection refused)

LWP::Protocol::http::Socket: connect: Connection refused at /Library/Perl/5.18/LWP/Protocol/http.pm line 46.

Attempt 2: Apache::Tika::Asynch
use Apache::Tika::Async; my $tika= Apache::Tika::Server->new; my $fn= shift; use Data::Dumper; print Dumper $tika->get_meta($fn); print Dumper $tika->get_text($fn);

That *is* the CPAN synopsis. It doesn't work. It will die on line 2 with Can't locate object method "new" via package "Apache::Tika::Server" Additionally, there is no new() method within the Apache::Tika::Async class.

Attempt 3: Apache::Tika::Server
use Data::Dumper; use Apache::Tika::Server; my $tika= Apache::Tika::Server->new(); # $tika->launch(); my $fn = "x.pdf"; print Dumper $tika->get_text($fn);

This gets me the following: Got HTTP error code 595 on the call to $tika->get_text. If I uncomment the call to $tika->launch, I get: Use of uninitialized value in join or string at /Library/Perl/5.18/Apache/Tika/Server.pm line 81.

So far I can find no other information on these libraries on-line. If anyone out there has some documentation or working examples on how to use them, I would love to see it.

Replies are listed 'Best First'.
Re^3: Converting PDF file to text
by Corion (Patriarch) on May 13, 2017 at 06:35 UTC

    Most likely the version of Java on your web server does not work with the version of Java the Tika JAR file requires. I can't help you there.

    I'm sorry that the synopsis of Apache::Tika::Async is broken - it should look like the following, but it seems I never released that fix onto CPAN:

    use Apache::Tika::Async; my $tika= Apache::Tika::Async->new; my $fn= shift; use Data::Dumper; my $info = $tika->get_all( $fn ); print Dumper $info->meta($fn); print $info->content($fn); # <html><body>... print $info->meta->{"meta:language"}; # en

    But all of this is in vain if the Tika executable won't start.

    Update: I've now published the Git repository of the module, which contains some fixes I should also release soonish.

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