java and csharp

Runtime-Environments.md

@@ -9,17 +9,17 @@ requires the `$HOME` variable to be set to something. Otherwise, it tries to
 look up the UID used by Isolate in `/etc/passwd` and fails. Setting `HOME=/box` 
 seems to work.
 
-We use a wrapper script that translates exceptions to error codes. This script can be found in the utils repository.
+We use a wrapper script that translates exceptions to error codes. This script can be found in the [utils](https://github.com/ReCodEx/utils/blob/master/runners/py/runner.py) repository.
 
 ## Java
 
-By default, we use a script that looks for a class with a `main` method and executes it for running Java programs. This script is located in the utils repository.
+By default, we use a script that looks for a class with a `main` method and executes it for running Java programs. There has to be only one class containing `main` method, otherwise error will be observed. The executed script is named `javarun.java` and can be found in the [utils](https://github.com/ReCodEx/utils/blob/master/runners/java/javarun.java) repository. In tested solutions we use its byte-compiled counterpart `javarun.class`, so be aware of name collisions.
-
-TODO: file javarun.java with class javarun is added to classical java execution
 
 ## C#
 
-TODO: files ReCodEx_Csharp_Wrapper.cs and ReCodEx_Csharp_Reader.cs are added to classical C# execution
+The C# solutions are executed with the help of [wrapper code](https://github.com/ReCodEx/utils/blob/master/runners/cs/Wrapper.cs). This code searches for `main` method in submitted source codes. There has to be only one class containing `main` method, otherwise error will be thrown. The name of the file containing wrapper code is `ReCodEx_Csharp_Wrapper.cs` and it contains namespace `CodEx` with class `Wrapper`, so be aware of filename and class collisions.
+
+In C# language there are none of the handy functions to operate with textual inputs like `scanf` in C. Therefore for every C# build in ReCodEx there is [Reader.cs](https://github.com/ReCodEx/utils/blob/master/runners/cs/Reader.cs) library included to make life of C# programmers easier. Please note that library is suppose to work only with ASCII files and some difficulties can be observed with modern Unicode (UTF-8) encodings. The `Reader` library contains namespace `CodEx` with class `Reader`, so again, be aware of filename and class collisions.
 
 ## Go