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Empty 'synchronized' statement

Reports synchronized statements with empty bodies.

Empty synchronized statements are sometimes used to wait for other threads to release a particular resource. However, there is no guarantee that the same resource won't be acquired again right after the empty synchronized statement finishes. For proper synchronization, the resource should be utilized inside the synchronized block.

Also, an empty synchronized block may appear after a refactoring when redundant code was removed. In this case, the synchronized block itself will be redundant and should be removed as well.


synchronized(lock) {}

A quick-fix is suggested to remove the empty synchronized statement.

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Threading issues

This inspection is disabled in JSP files.


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024