Junk character is not visible in Oracle SQL developer -

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i not able view junk character in oracle sql developer, visble in plsql developer. below screenshot plsql developer:

enter image description here

below screenshot oracle sql developer:

enter image description here

the junk character visible in notepad not visible here. please explain how can made visible in oracle sql developer tool allowed use officially.

use locale command:

$ jim>  locale lang=c lc_collate="c" lc_ctype="c" lc_monetary="c" lc_numeric="c" lc_time="c" lc_messages="c" lc_all=

usual locale setting on our db servers == utf-8 if use non-latin characters in in language different.


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