Confusing argument to varargs method

Reports calls to variable arity methods that have a single argument in the vararg parameter position, which is either a null or an array of a subtype of the vararg parameter. Such an argument may be confusing as it is unclear if a varargs or non-varargs call is desired.

Example:

  String[] ss = new String[]{"foo", "bar"};
  System.out.printf("%s", ss);

In this example only the first element of the array will be printed, not the entire array.

Locating this inspection

By ID

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NullArgumentToVariableArgMethod

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Settings or Preferences | Editor | Inspections | Java | Probable bugs

This inspection depends on the Java feature 'Variable arity methods' which is available since Java 5.

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