JAVA_HOME is wrong. Just use JRE because it found from JRE_Installation_Path\bin\Server.

[ghost]

Hello I found it looks wrong path to Java_Home because server\jvm.dll found from jre-xxx\bin\server\jvm.dll That is why it doesn't see for JAVA_HOME because JAVA_HOME has not directories server in bin directory

Thanks! I already copied from jre to jdk it works fine. Hehe But why do I need Assert.AreEqual("hello world", (string)s.toLowerCase());

Just write Console.WriteLine(s); It result:

It is really easy to understand :)