This was discovered in JPRT:

/usr/bin/mkdir -p /cygdrive/c/jprt/T/P1/051915.rvraghav/s/build/windows-x86/images/gengraphs
/cygdrive/c/jprt/T/P1/051915.rvraghav/s/build/windows-x86/configure-support/bin/fixpath.exe -c /cygdrive/c/jprt/T/P1/051915.rvraghav/s/build/windows-x86/jdk/bin/java -Xms64M -Xmx1024M -XX:ThreadStackSize=768 -esa -ea -cp /cygdrive/c/jprt/T/P1/051915.rvraghav/s/build/windows-x86/buildtools/tools_jigsaw_classes --add-modules jdk.jdeps --add-exports jdk.jdeps/com.sun.tools.jdeps=ALL-UNNAMED build.tools.jigsaw.GenGraphs --output /cygdrive/c/jprt/T/P1/051915.rvraghav/s/build/windows-x86/images/gengraphs
Error occurred during initialization of VM
CDS is not supported in exploded JDK build
GenerateModuleSummary.gmk:38: recipe for target '/cygdrive/c/jprt/T/P1/051915.rvraghav/s/build/windows-x86/images/gengraphs/jdk.dot' failed