functions-add-output-binding-java-cli.md

author	ggailey777
ms.service	azure-functions
ms.topic	include
ms.date	06/10/2022
ms.author	glenga
ms.custom	devdivchpfy22

In a Java project, the bindings are defined as binding annotations on the function method. The function.json file is then autogenerated based on these annotations.

Browse to the location of your function code under src/main/java, open the Function.java project file, and add the following parameter to the run method definition:

@QueueOutput(name = "msg", queueName = "outqueue", connection = "AzureWebJobsStorage") OutputBinding<String> msg

The msg parameter is an OutputBinding<T> type, which represents a collection of strings. These strings are written as messages to an output binding when the function completes. In this case, the output is a storage queue named outqueue. The connection string for the Storage account is set by the connection method. You pass the application setting that contains the Storage account connection string, rather than passing the connection string itself.

The run method definition must now look like the following example:

@FunctionName("HttpTrigger-Java")
public HttpResponseMessage run(
        @HttpTrigger(name = "req", methods = {HttpMethod.GET, HttpMethod.POST}, authLevel = AuthorizationLevel.FUNCTION)  
        HttpRequestMessage<Optional<String>> request, 
        @QueueOutput(name = "msg", queueName = "outqueue", connection = "AzureWebJobsStorage") 
        OutputBinding<String> msg, final ExecutionContext context) {
    ...
}