Commons BeanUtils can be built using Maven 2 or Ant as the build system.
Further details can be found in the commons build instructions.
To build a jar file, change into BeanUtils's root directory and run mvn package. The result will be in the "target" subdirectory.
To build the full website, run mvn site. The result will be in "target/site" subdirectory.
To build the full distribution, run mvn -Prc package. The result will be in "target" subdirectory.