Class without no-arg constructor

Reports classes without a constructor that takes no arguments (i.e. has no parameters). No-arg constructors are necessary in some contexts. For example, if a class needs to be created using reflection.

Example:

  public class Bean {
    private String name;

    public Bean(String name) {
      this.name = name;
    }
  }

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.

ClassWithoutNoArgConstructor

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 | JavaBeans issues

Use the checkbox below to ignore classes without explicit constructors. The compiler provides a default no-arg constructor to such classes.

Inspection options

Here you can find the description of settings available for the Class without no-arg constructor inspection, and the reference of their default values.

Ignore if class has default constructor: Default value:
Selected

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 ClassWithoutNoArgConstructor

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