DbVisualizer 10.0.3 comes with beta support for Java 9. The main improvement in Java 9 for DbVisualizer is HiDPI support on Windows and Linux (macOS have had this since Java 7.)
To give it a test you need Java 9 JRE installed separately and available in the PATH. In a terminal window Launch DbVisualizer with dbvisgui.bat on Windows or dbvisgui.sh on Linux. These scripts are located in the DbVisualizer installation folder.
Since Java 9 support is in beta only when using these scripts, please let us know your findings.