i'm developing a plugin for version 5.0 and i want to use the TemplateSource features
but as you know it presents on jira ver 5.1 and higher
is there any way to use the features of TemplateSource (like fragment)?
No, it's simply not there. You'd need to hack in a implementation yourself, either in your plugin, or into the core of Jira itself.
If this is a plugin for your organisation's use, I'd recommend spending the time on upgrading Jira instead of hacking. If it's a plugin to be shared with the world, then I'd adjust the target and actively say "5.1+ only"
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