Re: Converting PDF file to text

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Re^2: Converting PDF file to text by cerian (Novice) on May 12, 2017 at 17:13 UTC
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";` [download] 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);` [download] 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);` [download] 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.	[reply] [d/l] [select]
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` [download] 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.	[reply] [d/l]


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