This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
JasperManager method fillReport is overridden and can take as the first parameter, a String Object (Which you are using), an InputStream or a JasperReport object.
Using the String method requires the report template to be on the file system. When you do your deployment, you need to create report directory on the C drive of the target machine and put a copy of reportInvestment.jasper there.
A better way to do this to make deployments easier is to include /reports/reportInvestment.jasper in your Jar file and change your code to :