<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Hi Christian,</div><div dir="ltr"><br></div><div dir="ltr">that sound promising! Thanks a lot!</div><div dir="ltr"><br></div><div dir="ltr">Regards </div><div dir="ltr">Andreas</div><div dir="ltr"><br><blockquote type="cite">Am 30.10.2019 um 18:08 schrieb Christian Wirth <christian.wirth@oracle.com>:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Hi Andreas,</p>
<p>there is now a solution to your problem. You can use "Target type
mapping" [1] to specify you want that custom conversion in your
code. <br>
</p>
<p>Find below some pseudo-code how to do that. You will want to
fine-tune that to your usecase (not use allowAllAccess; not use
HostAccess.ALL; maybe include additional types). A more lengthy
discussion you will find in <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_graalvm_graaljs_issues_94&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=CUkXBxBNT_D5N6HMJ5T9Z6rmvNKYsqupcbk72K0lcoQ&m=QDH4yTDf6_X1L-NnUysBORTB4HfQlZodg6jN1LSjlRQ&s=4rAXxxifK7XO3PuO7r7eUvtylX7JMskord9rsg5iQGk&e=">https://github.com/graalvm/graaljs/issues/94</a>.
I'll also add an example of this to our FAQ in <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_graalvm_graaljs_blob_master_docs_user_FAQ.md&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=CUkXBxBNT_D5N6HMJ5T9Z6rmvNKYsqupcbk72K0lcoQ&m=QDH4yTDf6_X1L-NnUysBORTB4HfQlZodg6jN1LSjlRQ&s=qQ9-uMEIJ4yARwvPhnxboFzrkzfGrDD8dsvnYIIS3yo&e=">https://github.com/graalvm/graaljs/blob/master/docs/user/FAQ.md</a>
and/or our NashornMigrationGuide.md.<br>
</p>
<p>Best,<br>
Christian</p>
<p>[1] <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.graalvm.org_sdk_javadoc_org_graalvm_polyglot_HostAccess.Builder.html-23targetTypeMapping-2Djava.lang.Class-2Djava.lang.Class-2Djava.util.function.Predicate-2Djava.util.function.Function-2D&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=CUkXBxBNT_D5N6HMJ5T9Z6rmvNKYsqupcbk72K0lcoQ&m=QDH4yTDf6_X1L-NnUysBORTB4HfQlZodg6jN1LSjlRQ&s=S_9ww96cdW4vf9UPkCP5afELBbry3SsCVq2rjDcqZRM&e=">https://www.graalvm.org/sdk/javadoc/org/graalvm/polyglot/HostAccess.Builder.html#targetTypeMapping-java.lang.Class-java.lang.Class-java.util.function.Predicate-java.util.function.Function-</a></p>
<p><br>
Context context =
Context.newBuilder("js").allowAllAccess(true).allowHostAccess(getHostAccess()).build();<br>
<br>
private HostAccess getHostAccess() {<br>
HostAccess.Builder builder =
HostAccess.newBuilder(HostAccess.ALL);<br>
builder.targetTypeMapping(String.class, Integer.class,
null, (v) -> parseInt(v));<br>
return builder.build();<br>
}<br>
<br>
private int parseInt(String input) {<br>
try {<br>
return Integer.parseInt(input);<br>
} catch (Exception ex) {<br>
return 0; //TODO should not fail silently<br>
}<br>
}<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Am 29.10.2019 um 13:13 schrieb Andreas
Mueller:<br>
</div>
<blockquote type="cite" cite="mid:B448A6EB-A390-4BFA-8F9C-B8A28DFF6505@iit.de">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Hi,
<div class=""><br class="">
</div>
<div class="">I just wanted to ask if there was any change
meanwhile? </div>
<div class=""><br class="">
</div>
<div class="">I understand your arguments but it is a real pain to
convert a huge number of JS scripts to cast it to the
corresponding Java type. This prevents us to switch to GraalVM. </div>
<div class=""><br class="">
</div>
<div class="">Thanks,</div>
<div class="">Andreas</div>
<div class=""><br class="">
<div class="">-- <br class="">
Andreas Mueller<br class="">
IIT Software GmbH<br class="">
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.swiftmq.com&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=V2rW9Bb4RXGagEjJPJ7OhMWUid7VzLtEMOH5cLmS8dw&m=zenR0rlRfS2eOcu2DvpgYMGFuufo57cWv5zeDfJfndw&s=UuzNObx0M8twLhJye4cigfutTdU18WjwA2OE8RAaDSM&e=" class="" moz-do-not-send="true">http://www.swiftmq.com</a><br class="">
<br class="">
<span><div><swiftmq_logo_positiv.png></div></span><br class="">
</div>
<br class="">
<blockquote type="cite" class="">On 6. Sep 2018, at 18:29,
Andreas Mueller <<a href="mailto:am@iit.de" class="" moz-do-not-send="true">am@iit.de</a>> wrote:<br class="">
<br class="">
Hi Christian,<br class="">
<br class="">
thanks for the explanation.<br class="">
<br class="">
Look here (last section):<br class="">
<br class="">
<a href="https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/prog_guide/javascript.html" class="" moz-do-not-send="true">https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/prog_guide/javascript.html</a><br class="">
<br class="">
Regards <br class="">
Andreas <br class="">
<br class="">
Am 06.09.2018 um 15:47 schrieb Christian Wirth
<a class="moz-txt-link-rfc2396E" href="mailto:christian.wirth@oracle.com"><christian.wirth@oracle.com></a>:<br class="">
<br class="">
<blockquote type="cite" class="">Hi Andreas,<br class="">
<br class="">
thanks for keeping persistent on that matter.<br class="">
<br class="">
> Actually I don’t need this graaljs “feature” at all.
;-)<br class="">
<br class="">
In fact you would; you need a new Graal.js/Truffle feature
that converts the value for you. From a Java perspective,
you are providing a wrong data type according to the method
signature. You trust JavaScript to convert correctly,
according to some defined (?) semantics of selecting the
right method and right conversion.<br class="">
<br class="">
The reason why we don't have this by default is two fold:
first, we try to provide something that works across more
languages, not just JS between Java; and secondly, we think
such a feature can cause way more trouble than it solves,
especially if you go as far as String => int conversions.<br class="">
<br class="">
But yes, I acknowledge that this feature could simplify
the migration from Nashorn to Graal.js, especially if you
don't have an API on either side that does that already and
you cannot introduce such API.<br class="">
<br class="">
> can’t you just act like Nashorn<br class="">
<br class="">
Are you aware of any documentation (outside source code)
that describes Nashorn's semantics on this, that your code
depends on? In what order (of target data types) do you
expect we try to convert to, if ambiguous - especially when
methods with more than one arguments are involved? We have
seen behavior that is dependent on the ordering of method
definitions in the Java class file; that is something we
cannot easily support. We have seen errors arise from JS
code trusting its numeric data is int, while it was double
(or the other way round) unexpectedly; that's not something
we can solve automatically in the engine. <br class="">
<br class="">
We are still working on providing better compatibility. One
of the next improvements will be to explicitly select
which method+signature you want to call (<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_graalvm_graaljs_issues_37&d=DwQFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=V2rW9Bb4RXGagEjJPJ7OhMWUid7VzLtEMOH5cLmS8dw&m=zenR0rlRfS2eOcu2DvpgYMGFuufo57cWv5zeDfJfndw&s=hpeXue5n_zc8jBsh9pyXcqtYPwNxzPfxQPuXTuD-jwY&e=" moz-do-not-send="true">https://github.com/graalvm/graaljs/issues/37</a>).
This won't solve the problem of conversion, but allows to
mitigate the issue of seemingly random selection of methods
that are called. Feel free to file any issues you come
across in our Github Issue tracker; we can prioritize issues
of high interest.<br class="">
<br class="">
Note that the Nashorn Compatibility Mode is not something
we would encourage you to use on the long run. It helps you
to migrate more easily now, but with it enabled, you might
miss newer features of Graal.js/GraalVM, or run into
compatibility issues in your JS code (JSAdapter has been
superseded by ES6's Proxy, that JS Strings are in
fact java.lang.Strings is an implementation detail that
might not be correct forever, etc.).<br class="">
<br class="">
Best,<br class="">
Christian<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
Am 06.09.2018 um 14:20 schrieb Andreas Mueller:<br class="">
<blockquote type="cite" cite="mid:A0CA4089-1A8A-4994-BD7F-4EFF5501FC5F@iit.de" class="">Hi,<br class="">
<br class="">
I’ve tested the latest graalvm release and I’m
still getting an exception due to lossy conversion.<br class="">
<br class="">
Actually I have a JS var that contains a String but is an
int and the Java method call is int. I know that
graaljs is restrictive here but can’t you just act like
Nashorn when in Nashorn compatibility mode?<br class="">
<br class="">
I mean I know that I pass a String containing an int so I
am responsible for that. Actually I don’t need this
graaljs “feature” at all. ;-)<br class="">
<br class="">
Thanks,<br class="">
Andreas<br class="">
<br class="">
-- <br class="">
Andreas Mueller<br class="">
IIT Software GmbH<br class="">
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.swiftmq.com&d=DwQFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=V2rW9Bb4RXGagEjJPJ7OhMWUid7VzLtEMOH5cLmS8dw&m=zenR0rlRfS2eOcu2DvpgYMGFuufo57cWv5zeDfJfndw&s=UuzNObx0M8twLhJye4cigfutTdU18WjwA2OE8RAaDSM&e=" moz-do-not-send="true">http://www.swiftmq.com</a><br class="">
<br class="">
<swiftmq_logo_positiv.png><br class="">
<br class="">
<br class="">
<blockquote type="cite" class="">On 22 Jun 2018, at
20:34, Andreas Mueller <a class="moz-txt-link-rfc2396E" href="mailto:am@iit.de"><am@iit.de></a> wrote:<br class="">
<br class="">
Hi Christian,<br class="">
<br class="">
<blockquote type="cite" class="">Did you try if it
worked if you annotated it? Or is your code (or
relevant parts of it) open-source so we can run it
ourselves?<br class="">
</blockquote>
<br class="">
I didn’t test it yet. It’s not open source either (the
scripts are under Apache 2 but the SwiftMQ is not). <br class="">
<br class="">
The scripts are using a SwiftMQ Stream Interface (the
Java part provided by SwiftMQ). The intention is to use
any JSR 223 available scripting engine so that scripts
(SwiftMQ Steeams) can be written in JS, Groovy, Scala,
Python etc. We have only tested (and implemented it) in
JS. So I can add annotattions but would rather
appreciated if you don’t require them at all.<br class="">
<br class="">
Javadoc of the Stream Interface, FYI (sometimes we just
use a Runnable as the callback interface):<br class="">
<br class="">
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.swiftmq.com_products_router_swiftlets_sys-5Fstreams_si_javadoc_index.html&d=DwQFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=V2rW9Bb4RXGagEjJPJ7OhMWUid7VzLtEMOH5cLmS8dw&m=zenR0rlRfS2eOcu2DvpgYMGFuufo57cWv5zeDfJfndw&s=6HbGvcUl7MYIx3jlkj_SbRTvVqkR79D6_Vv5eLC5uUY&e=" moz-do-not-send="true">http://www.swiftmq.com/products/router/swiftlets/sys_streams/si/javadoc/index.html</a><br class="">
<br class="">
<br class="">
<blockquote type="cite" class="">> What we need is in
fact a Nashorn replacement as a scripting engine as
part of the JDK<br class="">
> or as a plugin into the JDK by adding it to
the classpath.<br class="">
<br class="">
Executing Graal JavaScript on a stock JDK is
possible already (without Graal as optimizing
compiler), and we are working on a fully-performant
solution for JDK 11 (with Graal). Graal JavaScript
tries to be closely compatible to Nashorn, but it is
unrealistic that it ever provides 100% compatibility.
Feedback like yours helps us understand what users
care about most.<br class="">
</blockquote>
<br class="">
We have a lot of scripts we can test again GraalVM,
no problem. Just post it when you have a new release and
I’ll give it a try.<br class="">
<br class="">
<blockquote type="cite" class=""><br class="">
> Nashorn’s performance is ok for us but an
increase would be much<br class="">
> appreciated. Are there plans to provide that?<br class="">
<br class="">
Graal JavaScript is significantly faster than Nashorn
on most peak performance benchmarks (often orders of
magnitude faster). But please note the difference:
Nashorn always compiles the JavaScript code it
executes to bytecode. Graal JavaScript requires Graal
as optimizing compiler to achive good performance. The
setup you are testing right now does not include
Graal, so in your case, JavaScript is only
interpreted, thus you will experience a
performance impact.<br class="">
</blockquote>
<br class="">
Interpreted is not an option for us.<br class="">
<br class="">
Thanks,<br class="">
Andreas<br class="">
-- <br class="">
Andreas Mueller<br class="">
IIT Software GmbH<br class="">
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.swiftmq.com&d=DwQFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=V2rW9Bb4RXGagEjJPJ7OhMWUid7VzLtEMOH5cLmS8dw&m=zenR0rlRfS2eOcu2DvpgYMGFuufo57cWv5zeDfJfndw&s=UuzNObx0M8twLhJye4cigfutTdU18WjwA2OE8RAaDSM&e=" moz-do-not-send="true">http://www.swiftmq.com</a><br class="">
<br class="">
<swiftmq_logo_positiv.png><br class="">
<br class="">
<br class="">
<br class="">
IIT Software GmbH<br class="">
Falkenhorst 11, 48155 Münster, Germany<br class="">
Phone: +49 (0)251 39 72 99 00<br class="">
Managing Director: Andreas Müller<br class="">
District Court: Amtsgericht Münster, HRB 16294<br class="">
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IIT Software GmbH<br class="">
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Phone: +49 (0)251 39 72 99 00<br class="">
Managing Director: Andreas Müller<br class="">
District Court: Amtsgericht Münster, HRB 16294<br class="">
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<hr>
IIT Software GmbH<br>
Falkenhorst 11, 48155 Münster, Germany<br>
Phone: +49 (0)251 39 72 99 00<br>
Managing Director: Andreas Müller<br>
District Court: Amtsgericht Münster, HRB 16294<br>
VAT-No: DE199945912<br>
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<HR />
IIT Software GmbH<BR />
Falkenhorst 11, 48155 Münster, Germany<BR />
Phone: +49 (0)251 39 72 99 00<BR />
Managing Director: Andreas Müller<BR />
District Court: Amtsgericht Münster, HRB 16294<BR />
VAT-No: DE199945912<BR />
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