Method with single 'synchronized' block can be replaced with 'synchronized' method

Reports methods whose body contains a single synchronized statement. A lock expression for this synchronized statement must be equal to this for instance methods or [ClassName].class for static methods.

To improve readability of such methods, you can remove the synchronized wrapper and mark the method as synchronized.

Example:

  public int generateInt(int x) {
    synchronized (this) {
      return 1;
    }
  }

After the quick-fix is applied:

  public synchronized int generateInt(int x) {
    return 1;
  }

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.

MethodMayBeSynchronized

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: MethodMayBeSynchronized

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 MethodMayBeSynchronized

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