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'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

Availability

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