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docs: clarified JVM_OPTS and JVM_XX_OPTS syntax

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Geoff Bourne
2021-11-01 17:29:10 -05:00
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README.md
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@@ -1297,8 +1297,7 @@ To let the JVM calculate the heap size from the container declared memory limit,
### JVM Options ### JVM Options
General JVM options can be passed to the Minecraft Server invocation by passing a `JVM_OPTS` General JVM options can be passed to the Minecraft Server invocation by passing a `JVM_OPTS`
environment variable. Options like `-X` that need to proceed general JVM options can be passed environment variable. The JVM requires `-XX` options to precede `-X` options, so those can be declared in `JVM_XX_OPTS`. Both variables are space-delimited, raw JVM arguments.
via a `JVM_XX_OPTS` environment variable.
For some cases, if e.g. after removing mods, it could be necessary to startup minecraft with an additional `-D` parameter like `-Dfml.queryResult=confirm`. To address this you can use the environment variable `JVM_DD_OPTS`, which builds the params from a given list of values separated by space, but without the `-D` prefix. To make things running under systems (e.g. Plesk), which doesn't allow `=` inside values, a `:` (colon) could be used instead. The upper example would look like this: For some cases, if e.g. after removing mods, it could be necessary to startup minecraft with an additional `-D` parameter like `-Dfml.queryResult=confirm`. To address this you can use the environment variable `JVM_DD_OPTS`, which builds the params from a given list of values separated by space, but without the `-D` prefix. To make things running under systems (e.g. Plesk), which doesn't allow `=` inside values, a `:` (colon) could be used instead. The upper example would look like this:
`JVM_DD_OPTS=fml.queryResult:confirm`, and will be converted to `-Dfml.queryResult=confirm`. `JVM_DD_OPTS=fml.queryResult:confirm`, and will be converted to `-Dfml.queryResult=confirm`.