#34 Cannot start robocode

[Anonymous]

After install running Robocode shortcut flashes a Command box and that's it.
I have tried a second computer and same thing happens.
When I run the robocode.bat from cmd line I get the following:

C:\Users\reali>java -Xmx512M -cp "libs/*" -Djava.security.manager=allow -XX:+IgnoreUnrecognizedVMOptions "--add-opens=java.base/sun.net.www.protocol.jar=ALL-UNNAMED" "--add-opens=java.base/java.lang.reflect=ALL-UNNAMED" "--add-opens=java.desktop/javax.swing.text=ALL-UNNAMED" "--add-opens=java.desktop/sun.awt=ALL-UNNAMED" robocode.Robocode
Error occurred during initialization of VM
java.lang.InternalError: Could not create SecurityManager: allow
at sun.misc.Launcher.<init>(Unknown Source)
at sun.misc.Launcher.<clinit>(Unknown Source)
at java.lang.ClassLoader.initSystemClassLoader(Unknown Source)
at java.lang.ClassLoader.getSystemClassLoader(Unknown Source)</clinit></init>

I have also tried Ubutu and get the same sort of thing:

C:\Users\reali>java -Xmx512M -cp "libs/*" -Djava.security.manager=allow -XX:+IgnoreUnrecognizedVMOptions "--add-opens=java.base/sun.net.www.protocol.jar=ALL-UNNAMED" "--add-opens=java.base/java.lang.reflect=ALL-UNNAMED" "--add-opens=java.desktop/javax.swing.text=ALL-UNNAMED" "--add-opens=java.desktop/sun.awt=ALL-UNNAMED" robocode.Robocode

Error occurred during initialization of VM
java.lang.InternalError: Could not create SecurityManager: allow
at sun.misc.Launcher.<init>(Unknown Source)
at sun.misc.Launcher.<clinit>(Unknown Source)
at java.lang.ClassLoader.initSystemClassLoader(Unknown Source)
at java.lang.ClassLoader.getSystemClassLoader(Unknown Source)</clinit></init>

[Flemming N. Larsen]

I looks like you are running on an older version of Java. You could try to install the newest Java version 18, which should solve the startup issue.

With older versions, before Java 12, you can just remove the -Djava.security.manager=allow from the robocode.bat file, which should solve your issue. :)