Synchronization on a non-final field

Reports synchronized statement lock expressions that consist of a non-final field reference. Such statements are unlikely to have useful semantics, as different threads may acquire different locks even when operating on the same object.

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.

SynchronizeOnNonFinalField

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

Example:

  private Object o;
  public void foo() {
    synchronized (o) // synchronization on a non-final field
    { }
  }

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 SynchronizeOnNonFinalField

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

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025