Accessing executing folder when running a jar file

I would like to be able to run a jar file java -jar myapp.jar on different folders and have it load config.properties based on the executing context.

/myapp/myapp.jar

/folder1/config.properties
/folder2/java -jar /myapp/myapp.jar    <------ loads /folder1/config.properties

/some/folder2/config.properties
/some/folder2/java -jar /myapp/myapp.jar   <------ loads /folder2/config.properties

Once the properties are loaded, I want it to then create some files in the current execution folder.

So:

1. How do I tell java to load a properties file based on the current executing context?
2. How do I get access the folder that the jar was executing from?