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Spring STS 4 seems to launch a separate process called PropertiesLauncher. I guess it's for supporting the Language Server Protocol.
Currently there is no way to pass VM arguments for this process, for example to customize garbage collector and memory settings.
Please provide a way to customize these options.
This got implemented for the 4.2.0 release:
To set specific VM arguments for the language server, please add a specific system property to your eclipse.ini file (or SpringToolSuite4.ini, depending on your install):
For example, you could add a line like this:
The individual arguments are comma separated and the value of this property is split into the individual pieces using