When I try to open a new data base or open an existing one I get the following message
“The connection to the data source ‘name’ could not be established. No java installation could be found. Please check your installation”
What kind of source is the data base ‘name’? The embedded data base engine HSQL indeed needs a JRE. What JRE do you have installed? Does LibreOffice find it in Tools > Options > LibreOffice > Advanced?