Eclipse Community Forums: Eclipse Titan » JSON decode error

Home » Eclipse Projects » Eclipse Titan » JSON decode error - float values(JSON decoding errors for certain float values)

Show: Today's Messages :: Show Polls :: Message Navigator

JSON decode error - float values [message #1853290]

Sun, 26 June 2022 19:14

Fabian Sow

Messages: 9
Registered: January 2022

Junior Member

Hello,

I am receiving a JSON message from a component, which I decode with the internal JSON decoder.

From time to time I get decoding errors from the internal JSON decoder.

While JSON-decoding type ...: Failed to extract valid token, invalid JSON format
Can not decode type ..., because invalid or incomplete message was received

It seems that it is related to float values in certain ranges. I typically receive rather small values in exponential format, e.g. 2.7e-9.

I can reproduce this behavior in the attached minimal example where different JSON messages with float values are sent, where some can be decoded and others not.

Is there an explanation for this behavior?

Best regards,
Fabian

Attachment: json_decode.zip
(Size: 2.74MB, Downloaded 92 times)

Report message to a moderator

Re: JSON decode error - float values [message #1853335 is a reply to message #1853290]

Tue, 28 June 2022 08:24

Adam Knapp

Messages: 50
Registered: November 2020

Member

Hi Fabian,

Thank you for bringing this up! It really seems to be a bug. I created an issue to follow up: https://gitlab.eclipse.org/eclipse/titan/titan.core/-/issues/609

Report message to a moderator

Re: JSON decode error - float values [message #1853420 is a reply to message #1853335]

Fri, 01 July 2022 08:41

Adam Knapp

Messages: 50
Registered: November 2020

Member

Hi Fabian,

The fix was merged, i.e. you should not get the error message above, instead the JSON float value should be decoded correctly.
Please note that that the accuracy of encoded float numbers is limited to 6 decimal places in Titan currently meaning that e.g. 1.2345678 will be encoded as 1.234567, as well as 1.2345678e-9 will be 1.234567e-09.
We are working on the improvement.

Report message to a moderator