B4J Question Java 10: -Xbootclasspath/p is no longer a supported option.

Unfortunately you still need the bootclasspath for JDK 8 only, so it's not a completely transparent solution, as you have to change the command line depending on the JDK version.

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Note that you may wish to consider using the conscrypt SSL provider with jetty. Not only is it much faster than native SSL, but it supports ALPN in both java8 and java9 without the need to modify the boot path.

https://www.eclipse.org/jetty/documentation/9.4.x/jetty-ssl-distribution.html

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OliverA said:

Looks like since Java 9, some things are changing and will need to be changed on this end for proper support. See https://github.com/jetty-project/jetty-alpn/issues/15. A couple of quotes from that link:

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KMatle said:

Did you try with Java 8? Java 10 is not that stable, yet.

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Jmu5667 said:

Thanks for the reply, still need to know how to use alpn-boot-8.1.11.v20170118.jar with Java 9+ as the b4j server app uses SSL.

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Jetty 9.4.6 only supports ALPN via the alpn-boot mechanism, which requires the alpn-boot jar to be in the bootclasspath.
Since Jetty 9.4.7, ALPN is also supported using JDK 9 specific APIs without the need of the alpn-boot mechanism. This only works when Jetty is run using JDK 9.
Since Jetty 9.4.8, ALPN is also supported via the Conscrypt provider, which binds natively to OpenSSL. This is supported for both JDK 8 and JDK 9.
The advantage of using the Conscrypt provider rather than the default JDK provider is increased performance and increased ease of configuration (since there is no need for the alpn-boot mechanism).

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Java SE 9 will be a short term release, and users should immediately transition to the next release (18.3) when available. Java SE 10 (18.3) will be a short term release and users should transition to the next release when available.

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OliverA said:

The next LTS version will be 11, which is expected to be available in September 2018. So until the next LTS comes out, I would personally just stick with 8.

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OliverA said:

Looking at the MANIFEST.MF file included in the jetty_b4j.jar file included in B4J version 6.01, the Jetty version is 9.4.6.v20170531.

Quoting from https://webtide.com/getting-started-with-jetty-and-jdk-9/:


Given these two pieces of information, JDK9 and up and -Xbootclasspath/p:alpn-boot-8.1.12.v20180117.jar with the current included Jetty will not happen.

Please note that JDK8 is considered LTS (long term support), and JDK9 and JDK10 are not (http://www.oracle.com/technetwork/java/eol-135779.html). Oracle even says this about Java SE 9 and 10.

The next LTS version will be 11, which is expected to be available in September 2018. So until the next LTS comes out, I would personally just stick with 8.

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Erel said:

That's very true. For now Java 8 is the main target.

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