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Ken,

On 3/18/20 16:25, ken edward wrote:
> Hello,
>
> When I deploy my war it produces the below error message, telling
> me to pass  the "--enable-preview".  I can add the
> "--enable-preview" to my tomcat start.sh script dev environment to
> resolve the problem. However, if I launch the production tomcat
> using the jsvc binary (to bind to port 443 instead of 8443), the
> JSVC binary doesn't seem to pass the "--enable-preview" parameter.
>
> What must I do to allow JSVC to accept and pass the
> "--enable-preview" parameter?
>
> apache-tomcat-9.0.27 jdk-13.0.1
>
> 18-Mar-2020 15:38:27.659 SEVERE [main]
> org.apache.catalina.core.StandardContext.filterStart Exception
> starting filter [FrameSecurityFilter]
> java.lang.UnsupportedClassVersionError: Preview features are not
> enabled for com/marsh/div/rock/emp/FrameSecurityFilter (class file
> version 57.65535). Try running with '--enable-preview' (unable to
> load class ......)
>
> BUT then if I try to add --enable-preview to the production JSVC
> script environment: "Invalid option --enable-preview Cannot parse
> command line arguments"

Have you tried "-X--enable-preview"?

Most Java-related binaries which call through to the JVM (e.g. javac)
offer an option to pass JVM parameters using "-J[foo]". I don't see a
mirror of that for jsvc unless maybe -X is intended to provide that
facility.

I would suggest that you ask the jsvc folks if they would consider
adding a -J alias to -X if indeed that's what it's for. If -X is
different than -J, then they should probably introduce a new -J option
to support such things.

- -chris
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