What does the error message "Invalid maximum heap size: -Xmx0m" mean?

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The error message "Invalid maximum heap size: -Xmx0m" means that the Java virtual machine is trying to allocate zero bytes of memory for the maximum heap size. This is an invalid setting because the virtual machine needs a minimum amount of memory to function properly. Typically, the heap size should be set to a value that is a multiple of 1024 and no smaller than 256MB.