Unsynchronized method overrides 'synchronized' method

Reports non-synchronized methods overriding synchronized methods.

The overridden method will not be automatically synchronized if the superclass method is declared as synchronized. This may result in unexpected race conditions when using the subclass.

Example:

  class Super {
    synchronized void process() {}
  }
  class Sub extends Super {
    // Unsynchronized method 'process()' overrides synchronized method
    void process() {}
  }  

Locating this inspection

By ID

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

NonSynchronizedMethodOverridesSynchronizedMethod

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

Inspection ID: NonSynchronizedMethodOverridesSynchronizedMethod

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection NonSynchronizedMethodOverridesSynchronizedMethod

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025