Environments Variables setting

My Java application used a JNI library, and I have tried to add the path where the `*.dll` is located to `path` environment globally.

However when I run the app in IDEA,I got error:

Native library load failed.
java.lang.UnsatisfiedLinkError: D:\install\xxx\xx.dll: can not find the specified program
java.lang.UnsatisfiedLinkError: org.gdal.ogr.ogrJNI.RegisterAll()V
at org.gdal.ogr.ogrJNI.RegisterAll(Native Method)
at org.gdal.ogr.ogr.RegisterAll(ogr.java:131)
at org.geotools.data.ogr.FilterTest.<clinit>(FilterTest.java:21)
Exception in thread "main" 

But I am SURE that the `D:\install\xxx\xx.dll` file exist.

Then I tried to set the environment variables again in IDEA (the name and value are exactly the same as the setting in global):

And if I check the variables, I found that they are not listed, but the same variables are highlighted with a blue color:

Then I ran the program again, it worked as expected.

What's going on?

BTW, I check the commands IDEA runs carefully, and they are exactly the same no matter what environment varietals are set. 

So how does the variables take affect for the program?