Non-serializable object passed to 'ObjectOutputStream'

Reports non-Serializable objects used as arguments to java.io.ObjectOutputStream.write(). Such calls will result in runtime exceptions.

This inspection assumes objects of the types java.util.Collection and java.util.Map to be Serializable, unless the types they are declared in are non-Serializable.

Example:

  public class IWantToSerializeThis {
    public static void main(String[] args) throws IOException {
      try(var stream = new ObjectOutputStream(Files.newOutputStream(Paths.get("output")))) {
        // Warning -- will fail with NotSerializableException
        stream.writeObject(new IWantToSerializeThis());
      }
    }
  }

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.

NonSerializableObjectPassedToObjectStream

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 | Serialization issues

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