DecimalFormat::toPattern throws OutOfMemoryError when pattern is empty string

Observed that
jshell> import java.text.*;

jshell> new DecimalFormat("", new DecimalFormatSymbols()).toString()
| Exception java.lang.OutOfMemoryError: Java heap space
| at Arrays.copyOf (Arrays.java:3540)
| at AbstractStringBuilder.ensureCapacityInternal (AbstractStringBuilder.java:245)
| at AbstractStringBuilder.append (AbstractStringBuilder.java:813)
| at StringBuilder.append (StringBuilder.java:246)
| at DecimalFormat.toPattern (DecimalFormat.java:3317)
| at DecimalFormat.toPattern (DecimalFormat.java:3030)
| at DecimalFormat.toString (DecimalFormat.java:3019)
| at (#2:1)


During CSR JDK-8323088 validations