JSON::XS and blessings

cshavit has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks, I have perl code running on apache. And the weirdest problem.

Consider this code snippet:

use JSON::XS;
# # #
my $json = "{\"has_more\": true}";
my $d = decode_json($json);
my $e = encode_json($d);
[download]

You'd expect $e to equal $json. And if you ran it from a shell, it would be true.

I have two apache virtual hosts, running by the same Apache server on Ubunto. One of the servers always runs the code correctly. The other always dies on encode_json() with

"encountered object '1', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)"

The problem does not happen if I use JSON::PP.

Could you please help me with fixing it? Even a hint.

Thanks!

Comment on JSON::XS and blessings Download Code

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Re: JSON::XS and blessings by toolic (Bishop) on Oct 13, 2015 at 19:50 UTC
Maybe you have an old, buggy version of JSON::XS on one of the hosts. Add this to the code to see what versions you're using: `print "$JSON::XS::VERSION $]\n";` [download]	[reply] [d/l]
Re^2: JSON::XS and blessings by cshavit (Novice) on Oct 13, 2015 at 19:57 UTC
Both servers run the latest. The printf prints `3.01 5.018002` The thing that puzzles me if how could two virtual servers run anything different. Wouldn't `"use ABC;` load the same ABC on both? I'm asking because evidently something is different.	[reply] [d/l] [select]
Re^3: JSON::XS and blessings by Your Mother (Archbishop) on Oct 13, 2015 at 20:06 UTC
`true` is the problem but I don't know why it's a problem. It roundtrips fine for me with 2.26. :\|	[reply] [d/l]
Re^4: JSON::XS and blessings by cshavit (Novice) on Oct 13, 2015 at 20:30 UTC
Re^5: JSON::XS and blessings (bless \1) by tye (Sage) on Oct 13, 2015 at 22:26 UTC
Re^3: JSON::XS and blessings by toolic (Bishop) on Oct 14, 2015 at 14:59 UTC
I'm asking because evidently something* is different.* Some other ideas for checking differences... `use Data::Dumper; $Data::Dumper::Sortkeys=1; print Dumper(\%ENV); system 'uname -a';` [download] The code is XS, which means that it requires a C compiler (which may be different).	[reply] [d/l]
Re^4: JSON::XS and blessings by cshavit (Novice) on Oct 14, 2015 at 16:41 UTC
Re^5: JSON::XS and blessings by Your Mother (Archbishop) on Oct 14, 2015 at 17:31 UTC
Some notes below your chosen depth have not been shown here
Re: JSON::XS and blessings by Anonymous Monk on Oct 16, 2015 at 08:03 UTC
My guess is that you use JSON::XS from different ithreads, and JSON::XS says its not ithread-safe. It has code to go into super slow mode in that case, but that might not work, so it might not recognize the boolean package as "the" boolean package. It might be something else, but that came to my mind.	[reply]