'Serializable' object implicitly stores non-'Serializable' object

Reports any references to local non-Serializable variables outside Serializable lambdas, local and anonymous classes.

When a local variable is referenced from an anonymous class, its value is stored in an implicit field of that class. The same happens for local classes and lambdas. If the variable is of a non-Serializable type, serialization will fail.

Example:

  interface A extends Serializable {
      abstract void foo();
  }
  class B {}
  class C {
      void foo() {
          B b = new B();
          A a = new A() {
              @Override
              public void foo() {
                  System.out.println(b); // warning
              }
          };
      }
  }

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.

SerializableStoresNonSerializable

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 | Serialization issues

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 SerializableStoresNonSerializable

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