Apache Ant Fail Task

This task is used to stop current build and throw BuildException. It exits from the current build and displays an exception message to the console.

The message attribute is used to set exception message to this element.

Apache Ant Fail Task Attributes

Attribute	Description	Required
message	A message to show the reason of fail.	No
if	Only fail if a property exists in current directory.	No
unless	Only fail if a property doesn't exist in the current project	No

Lets see some examples of Ant Fail Task which are given below.

Without message

<project name="fail-project-example" default="fail">
	<target name="fail">
		<fail/>
	</target>
</project>

Set message too

<project name="fail-project-example" default="fail">
	<target name="fail">
		<fail message="something went wrong"/>
	</target>
</project>

Using unless

<project name="fail-project-example" default="fail">
	<target name="fail">
		<fail unless="it is unless message"/>
	</target>
</project>

Output:

fail:
BUILD FAILED
unless=it is unless message

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