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'assert' statement with side effects

Reports assert statements that cause side effects.

Since assertions can be switched off, these side effects are not guaranteed, which can cause subtle bugs. Common unwanted side effects detected by this inspection are modifications of variables and fields. When methods calls are involved, they are analyzed one level deep.

Example:

assert i++ < 10;

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.

AssertWithSideEffects
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 | Probable bugs

This inspection depends on the Java feature 'Assertions', which is available since Java 1.4.

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 AssertWithSideEffects

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details

By default bundled with:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025