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There is a bug in PMD, see https://github.com/pmd/pmd/issues/872
This is likely properly fixed in 6.1.0.
But for 5.7.0, this custom fix should work in DaCapo's case.

 - changed checking from stderr to stdout;
 - updated checksum;
 - use `braces.xml` and `text` format to produce some output on the
`xsmall` size;
 - patch a problematic code in PMD `AbstractRenderer.java` which closes
output stream after flushing. This causes null pointer error when DaCapo
tries to close TeePrintStream again.

PMD 5.7.0 use Maven as its build system. The `build.xml` for the
benchmark has been changed to call Maven.
Also, it requires Java JDK toolchain to be configured for Maven. A
shell script has been added to generate the toolchain.xml file.

Note that during the building process, PMD requires both 1.7 and 1.8
toolchain to be configured. A clean solution would require the JDK7 to
be installed on the platfor along with JDK8/9. This requirement can be
annoying. Therefore the generated toolchain.xml file
has a hack such that if the platform java version is >= 1.8, it will
generate two entries (1.7 and the actual version) that point to the same
JDK directory.

Also the download link for the release has been changed to GitHub.