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From: "Toke, Mahesh" <mahesh_toke AT bmc DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
CC: "Virulkar, Nitin" <Nitin_Virulkar AT bmc DOT com>,
        "Badhei, Sankharaj"	<Sankharaj_Badhei AT bmc DOT com>
Subject: Problem to retrieve environment variable values in JVM when Cygwin prompt is used
Date: Mon, 18 Dec 2017 11:35:07 +0000
Message-ID: <e94789226dd64626944bc4029433ef08@hou-exmbprd-03.adprod.bmc.com>
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Hi,=20

We use Cygwin build and its command prompt in our use cases.=20
Currently, We are facing a problem to retrieve environment variable values =
in JVM program. Please find details of issue below :

Version details : Currently, cygwin1.7.33 is being used on windows (tried o=
n server 2008R2, server 2012) platform.=20

Files attached with this mail :
1. SampleJVM.cpp =3D=3D> C program which evokes JVM and it calls a java met=
hod
2. TestEnvironmentVariables.java and TestEnvironmentVariables.class =3D=3D>=
 Java program containing a method to print environment variables.

Precautions :
1. Ensure that jdk is installed on the system.=20
2. In the SampleJVM.cpp program, LoadLibrary() function loads jvm.dll. Plea=
se replace the path with local installation path.
3. -Djava.class.path is set to C:\\temp where TestEnvironmentVariables.clas=
s file is kept. Please replace C:\\temp with local disk path where TestEnvi=
ronmentVariables.class is kept.
4. Compile the program on cygwin command prompt using : g++ SampleJVM.cpp -=
o SampleJVM -I"C:\Microsoft\include\jni" -I"C:\Microsoft\include\jni\win32"
Ensure that C:\Microsoft\include\jni and C:\Microsoft\include\jni\win32 are=
 replaced with location of jni.h and jni_md.h file. These files will be pre=
sent in jdk installation.
5. Execute the program ./SampleJVM on cygwin prompt

Results :
PATH, SYSTEMDRIVE, SYSTEMROOT, WINDIR variables are getting printed.

Problem :
On windows machine, there are many environment variables already set. But t=
hey are not getting printed as output of java program.
For example APPDATA variable value is coming null hence not printed on the =
command prompt.
Same program if built using another compiler (e.g. visual studio) and execu=
ted on command prompt then it prints all the environment values.

As a summary, when a C program spawns a JVM and calls java method, then ins=
ide java method, we are not able to retrieve environment variable values.
This issue is occurring only when we use Cygwin build and Cygwin command pr=
ompt.

I did not find related information on this problem on Cygwin faqs link. It =
looks like a generic bug with Cygwin build.

Please confirm if you are able to run the sample program and reproduce the =
issue.
Thanks to update me on its status.

Regards,
Mahesh


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