'Channel' opened but not safely closed

Reports Channel resources that are not safely closed, including any instances created by calling getChannel() on a file or socket resource.

By default, the inspection assumes that the resources can be closed by any method with 'close' or 'cleanup' in its name.

Example:

  void send(Socket socket) throws IOException {
    SocketChannel channel = socket.getChannel(); //warning
    channel.write(ByteBuffer.wrap("message".getBytes()));
  }

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.

ChannelOpenedButNotSafelyClosed

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 | Resource management

Use the following options to configure the inspection:

Whether a Channel resource is allowed to be opened inside a try block. This style is less desirable because it is more verbose than opening a Channel in front of a try block.
Whether the resource can be closed by any method call with the resource passed as argument.

Inspection options

Here you can find the description of settings available for the 'Channel' opened but not safely closed inspection, and the reference of their default values.

Allow resource to be opened inside a 'try' block: Default value:
Not selected
Any method may close resource argument: 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 ChannelOpenedButNotSafelyClosed

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