Environment

• jruby 9.1.16.0 (2.3.3) 2018-02-21 8f3f95a Java HotSpot(TM) 64-Bit Server VM 25.161-b12 on 1.8.0_161-b12 +jit [darwin-x86_64]
• Darwin Kernel Version 16.7.0: Tue Jan 30 11:27:06 PST 2018; root:xnu-3789.73.11~1/RELEASE_X86_64 x86_64

Expected Behavior

• I expected to be able to set the java.security.egd java system property.

Actual Behavior

$ jruby -e "puts java.lang.System.getProperty('java.security.egd')"
file:/dev/urandom
$ jruby -J-Djava.security.egd=file:/dev/./urandom -e "puts java.lang.System.getProperty('java.security.egd')"
-Djava.security.egd=file:/dev/./urandom

Note that the value of the system property starts with -DJava.security.... Introduced in 1a4f888 (the fix for #4685), the value of JAVA_SECURITY_EGD is set to the whole argument, and not the value substring.