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Unsafe lazy initialization of 'static' field

Reports static variables that are lazily initialized in a non-thread-safe manner.

Lazy initialization of static variables should be done with an appropriate synchronization construct to prevent different threads from performing conflicting initialization.

When applicable, a quick-fix, which introduces the lazy initialization holder class idiom, is suggested. This idiom makes use of the fact that the JVM guarantees that a class will not be initialized until it is used.

Example:

class X { private static List<String> list; public List<String> getList() { if (list == null) { list = List.of("one", "two", "tree"); } return list; } }

After the quick-fix is applied:

class X { private static final class ListHolder { static final List<String> list = List.of("one", "two", "tree"); } public List<String> getList() { return ListHolder.list; } }

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024