Value-based warnings

Reports attempts to synchronize on an instance of a value-based class that produce compile-time warnings and raise run-time exceptions starting from Java 16.

For example, java.lang.Double is annotated with jdk.internal.ValueBased, so the following code will produce a compile-time warning:

Double d = 20.0;
synchronized (d) { ... } // javac 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.

SynchronizeOnValueBasedClass

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 | Compiler issues

New in 2021.1

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