Hans-Peter Stoerr created SLING-9824:
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Summary: sun.misc.Unsafe accessible in Sling Starter 12
Key: SLING-9824
URL: https://issues.apache.org/jira/browse/SLING-9824
Project: Sling
Issue Type: Bug
Components: Starter
Affects Versions: Starter 12
Environment: Sling-Starter 12-SNAPSHOT (commit addb8f7b) with JDK 11
and 13 on MacOS, JDK 11 on an x86_64 Linux
Reporter: Hans-Peter Stoerr
We are having some trouble running our application on [the current Sling
Starter 12
snapshot|https://github.com/apache/sling-org-apache-sling-starter/tree/addb8f7ba16dfb2ab6cda1a70f98a461a7cacb7a]
since we are using ehache 3, which uses sun.misc.Unsafe internally. This works
with Sling Starter 11, but since Sling Starter changed to the feature launcher,
this class seems to have disappeared from the classpath: the class loading of
ehcache classes fails with a java.lang.NoClassDefFoundError: sun/misc/Unsafe
I tried to add command line arguments
--add-modules=jdk.unsupported
and
--add-opens=jdk.unsupported/sun.misc=ALL-UNNAMED
to the launcher command line, as I've seen that suggested on the net for
similar problems, but it didn't help.
In fact, this doesn't seem to be the problem: even without those flags the
jdk.unsupported module does export sun.misc:
module
{ name: [email protected], [mandated java.base], exports:
[com.sun.nio.file, sun.misc, sun.reflect], opens: [sun.misc, sun.reflect] }
So it seems the module is loaded, but not used to load the class.
The easiest way to reproduce the problem is to add this to some JSP:
<%
Class clazz = sun.misc.Unsafe.class;
%>
In case that matters: I tried JDK 11 and 13 on MacOS, as well as JDK 11 on an
x86_64 Linux.
This works on Sling Starter 11, but not the current 12 snapshot.
The workaround to add
{{-D org.osgi.framework.system.packages.extra=sun.misc}}
to the command line, which was thankfully suggested [in the mailing
list|https://www.mail-archive.com/[email protected]/msg05423.html], does
work. But I feel it is not a particularily clean solution. It also does
something else than what happens on Sling Starter 11 : now the sun.misc package
is listed in the exports list of the felix framework bundle
[http://localhost:9090/system/console/bundles/0] . Not sure whether this is
good or bad.
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