docs: public static long getMaxJvmHeapMemory() {
  		final long maxMemory = Runtime.getRuntime().maxMemory();
  		if (maxMemory != Long.MAX_VALUE) {
  			// we have the proper max memory
  			return maxMemory;
  		} else {
  			// max JVM heap size is not set - use the heuristic to use 1/4th of the physical memory
  			final long physicalMemory = Hardware.getSizeOfPhysicalMemory();
  			if (physicalMemory != -1) {
  				// got proper value for physical memory
  				return physicalMemory / 4;
  			} else {
  				throw new RuntimeException("Could not determine the amount of free memory.\n" +
  						"Please set the maximum memory for the JVM, e.g. -Xmx512M for 512 megabytes.");
  			}
  		}
  	}