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Got some warnings. import says "package org.json does not exist", JSONObject says "cannot find symbol",

such warnings should disappear
Sorry to bother, it's due to another plugin
Duplicate of #161
try removing the java linter extension
I had this problem even without java linter extension ever having been installed.
I fixed the issue by reinstalling several java related extensions including the Java-Extension-Pack
Duplicate of #161
try removing the java linter extension
Disabling Java Linter extension solved my problem, too.
Disabling Java Linter extension solved my problem, too.
Disabling Java Linter extension faustinoaq.javac-linter https://marketplace.visualstudio.com/items?itemName=faustinoaq.javac-linter solved for me!
Most helpful comment
I had this problem even without java linter extension ever having been installed.
I fixed the issue by reinstalling several java related extensions including the Java-Extension-Pack