This slide explains which alterations to the system are necessary for setting up the online access
As suggested on Arch website:
mkdir -p /etc/.java/.systemPrefs
chmod 755 -R /etc/.java
Remember: everything should be done in a dedicated virtual machine.
It seems that Banco do Brasil uses an insecure method of signing .jar files. This is forbidden in Ubuntu and in other modern Linux systems. In order to allow Banco do Brasil to bypass those security requirements, edit the file /etc/java-8-oracle/security/java.security and comment out the line: jdk.jar.disabledAlgorithms=...