FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+128)
Java HotSpot(TM) Server VM (build 9-ea+128, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
From a Windows command line with C:\ProgramData\Oracle\Java\javapath in the PATH, typing 'java' should launch a JVM. After installing a Java 9 JRE the command fails.

REGRESSION. Last worked in version 8u112

ADDITIONAL REGRESSION INFORMATION:
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+128)
Java HotSpot(TM) Server VM (build 9-ea+128, mixed mode)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Install a Java 8 JRE
2. Open a windows command prompt and type java, the JVM should launch normally and give the usage instructions
3. Install a Java 9 JRE
4. Type java, the JVM should launch normally and give the usage instructions

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The JVM version 9 should launch correctly
ACTUAL -
The JVM fails to launch

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Error: could not find java.dll
Error: Could not find Java SE Runtime Environment.

REPRODUCIBILITY :
This bug can be reproduced always.