intellij idea – Error: java: invalid source release 1.9

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Select the project, then File > ProjectStructure > ProjectSettings > Modules -> sources
You probably have the Language Level set at 9:

screenshot

Just change it to 8 (or whatever you need) and you’re set to go.

Also, check the same Language Level settings mentioned above, under Project Settings > Project

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)