<echoproperties/>Report the current properties to the log.
<echoproperties destfile="my.properties"/>Report the current properties to the file "my.properties", and will fail the build if the file could not be created or written to.
<echoproperties destfile="my.properties" failonerror="false" />Report the current properties to the file "my.properties", and will log a message if the file could not be created or written to, but will still allow the build to continue.
<echoproperties prefix="java."/>List all properties beginning with "java."