Sigtest works errouniously when both jimage and jar are specified at Classpath

Following command line produce empty sigfile;

/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/bin/java -Dexclude.plugin=com.sun.tdk.exclude.ExcludeList -cp /java/jck/spb/SigTestStorage/Sigtest4.0/sigtestdev.jar:/java/jck/spb/SigTestStorage/Sigtest4.0/exclude.jar com.sun.tdk.signaturetest.Setup -static -CheckValue -NonClosedFile -xjimage /java/re/jdk/9/promoted/all/b74/binaries/linux-x64/bin/jimage -Classpath /java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/modules/appmodules.jimage:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/modules/bootmodules.jimage:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/modules/extmodules.jimage:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/rt.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/jce.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/jsse.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/javaws.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/dt.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/javaws.jar -keepfile -ApiVersion 9/b74 -package javax.jnlp -FileName /java/jck/spb/SigTestStorage/workdir/sig/9/b74/javax_jnlp.sig

However if all the jimages are removed from the -Classpath sigtest option sigfile is produced successfully:

/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/bin/java -Dexclude.plugin=com.sun.tdk.exclude.ExcludeList -cp /java/jck/spb/SigTestStorage/Sigtest4.0/sigtestdev.jar:/java/jck/spb/SigTestStorage/Sigtest4.0/exclude.jar com.sun.tdk.signaturetest.Setup -static -CheckValue -NonClosedFile -xjimage /java/re/jdk/9/promoted/all/b74/binaries/linux-x64/bin/jimage -Classpath /java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/rt.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/jce.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/jsse.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/jre/lib/javaws.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/dt.jar:/java/re/jdk/9/promoted/all/b74/binaries/linux-x64/lib/javaws.jar -keepfile -ApiVersion 9/b74 -package javax.jnlp -FileName /java/jck/spb/SigTestStorage/workdir/sig/9/b74/javax_jnlp.sig