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Posted to notifications@ant.apache.org by bu...@apache.org on 2020/05/24 05:53:53 UTC
[Bug 64469] New: Ant build.xml fails with "Unable to create javax
script engine for javascript" with latest JDK 15 due to removal of Nashorn
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
Bug ID: 64469
Summary: Ant build.xml fails with "Unable to create javax
script engine for javascript" with latest JDK 15 due
to removal of Nashorn
Product: Ant
Version: 1.10.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core tasks
Assignee: notifications@ant.apache.org
Reporter: dominik.stadler@gmx.at
Target Milestone: ---
The Javascript engine was deprecated in JDK 11 and now removed JKD 15, see
https://openjdk.java.net/jeps/372 for details.
Ant uses it for providing the <scriptdef> and <script> task.
Apache POI uses Apache Ant for building. When testing the build with the latest
JDK 15 pre-release 15-ea+24-1168, the build fails because it uses the
<scriptdef> task, but the Javascript implementation "Nashorn" was removed from
the JDK now.
Output is:
build.xml:122: Unable to create javax script engine for javascript
I tried to use the supported engine "bsf", but I could not find documentation
about how to actually make it work and some simple tries resulted in "Unable to
load the BSF script engine manager (org.apache.bsf.BSFManager)" when using 3.x,
with 2.4.0 it worked a bit more, but also failed, because simple things like
String.replace(Regex, String) are not supported.
See https://golb.hplar.ch/2020/04/java-javascript-engine.html for a possible
replacement via graal-js. However when trying to use this implementation in
Ant, I get an error "Unsupported language prefix graal.js", so Ant seems to
currently hardcode the list of implementations, see
https://github.com/apache/ant/blob/master/src/main/org/apache/tools/ant/util/ScriptRunnerCreator.java
So it seems for full support of JDK 15, Ant will need to allow to switch to
another Javascript implementation, e.g. graal-js as the only current option
"bsf" is not a good replacement upon a quick look.
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #2 from Dominik Stadler <do...@gmx.at> ---
Thanks for the hints, when trying GraalJS this way I am stuck at the following:
Finding class org.graalvm.polyglot.Engine
[propertyreset] ScriptEngineManager providers.next():
javax.script.ScriptEngineFactory: Provider
com.oracle.truffle.js.scriptengine.GraalJSEngineFactory could not be
instantiated
I supplied the following jars:
js-20.1.0.jar
js-launcher-20.1.0.jar
js-scriptengine-20.1.0.jar
maybe I am missing some more? ant -debug did not provide more information.
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #7 from Dominik Stadler <do...@gmx.at> ---
Thanks a lot for your work!
It seems to mostly work now with the version from master, some additional
jar-files were necessary to support regex and others, unfortunately the error
message in Graal.js is not very specific about the reason.
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #4 from Stefan Bodewig <bo...@apache.org> ---
I got this to work when setting the system property polyglot.js.nashorn-compat
to true. See https://www.graalvm.org/docs/reference-manual/languages/js/
This is not satisfying, I need to look into what needs to be done in order to
avoid that.
Aside: at least on Java 8 Ant's own scriptdef test that I disabled for Java 15
with
https://github.com/apache/ant/commit/dffd57ca23bcb6e8f40d14a9d1f49d143b2dc8d3
fails as the compiled script on graal.js is slower than the uncompiled version
(and significantly so).
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
Stefan Bodewig <bo...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |1.10.9
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #10 from Stefan Bodewig <bo...@apache.org> ---
Thanks Dominik, I totally forgot to close this.
Yes, 1.10.9 should work.
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #9 from Dominik Stadler <do...@gmx.at> ---
The release notes of Apache Ant 1.10.9 sound like this is fixed now, or?
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #8 from Stefan Bodewig <bo...@apache.org> ---
I guess we will have a bit of documentation to do.
One thing I haven't made up my mind about is whether we should enable full
Nashorn compatibility or not by default, but I tend to not do so and leave it
to people who run the build - but tell them to set a system property before
starting Ant if they need to.
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #5 from Stefan Bodewig <bo...@apache.org> ---
you may want to give the graal.js branch a try.
https://github.com/graalvm/graaljs/blob/master/docs/user/ScriptEngine.md guided
me to unrestrict graal.js so the script is allowed to do as much as the old
Nashorn engine would allow.
I had to adapt the js example which contained
echo.setMessage(i*i);
Here Nashorn must have magically translated the Javascript number to a String,
graal.js is not willing to go that far (but seems to do so in Nashorn
compatibility mode).
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[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #3 from Stefan Bodewig <bo...@apache.org> ---
I am getting closer by using the Maven Ant tasks in Ant's own fetch.xml. I told
it to download the equivalent of
<dependency>
<groupId>org.graalvm.js</groupId>
<artifactId>js</artifactId>
<version>20.1.0</version>
</dependency>
<dependency>
<groupId>org.graalvm.js</groupId>
<artifactId>js-scriptengine</artifactId>
<version>20.1.0</version>
</dependency>
which resulted in
Downloading: org/graalvm/js/js/20.1.0/js-20.1.0.pom from repository central at
https://repo1.maven.org/maven2/
Transferring 3K from central
Downloading: org/graalvm/regex/regex/20.1.0/regex-20.1.0.pom from repository
central at https://repo1.maven.org/maven2/
Transferring 1K from central
Downloading: org/graalvm/truffle/truffle-api/20.1.0/truffle-api-20.1.0.pom from
repository central at https://repo1.maven.org/maven2/
Transferring 1K from central
Downloading: org/graalvm/sdk/graal-sdk/20.1.0/graal-sdk-20.1.0.pom from
repository central at https://repo1.maven.org/maven2/
Transferring 1K from central
Downloading: com/ibm/icu/icu4j/66.1/icu4j-66.1.pom from repository central at
https://repo1.maven.org/maven2/
Transferring 5K from central
Downloading: org/graalvm/regex/regex/20.1.0/regex-20.1.0.jar from repository
central at https://repo1.maven.org/maven2/
Downloading: org/graalvm/sdk/graal-sdk/20.1.0/graal-sdk-20.1.0.jar from
repository central at https://repo1.maven.org/maven2/
Downloading: org/graalvm/js/js/20.1.0/js-20.1.0.jar from repository central at
https://repo1.maven.org/maven2/
Downloading: org/graalvm/truffle/truffle-api/20.1.0/truffle-api-20.1.0.jar from
repository central at https://repo1.maven.org/maven2/
Downloading: com/ibm/icu/icu4j/66.1/icu4j-66.1.jar from repository central at
https://repo1.maven.org/maven2/
Transferring 2502K from central
Transferring 12632K from central
Transferring 5331K from central
Transferring 524K from central
Transferring 16132K from central
Copying 10 files to /home/stefan/devel/ASF/ant/lib/optional
Downloading: org/graalvm/js/js-scriptengine/20.1.0/js-scriptengine-20.1.0.pom
from repository central at https://repo1.maven.org/maven2/
Transferring 1K from central
Downloading: org/graalvm/js/js-scriptengine/20.1.0/js-scriptengine-20.1.0.jar
from repository central at https://repo1.maven.org/maven2/
Transferring 57K from central
Copying 1 file to /home/stefan/devel/ASF/ant/lib/optional
with this I can create the engine but it looks as if exposing beans to
graal.js needs something more than we've done for Nashorn. Bassed on Ant's
manual I created
<project name="squares" default="main" basedir=".">
<target name="main">
<script language="graal.js" manager="javax"> <![CDATA[
for (i = 1; i <= 10; i++) {
echo = squares.createTask("echo");
echo.setMessage(i*i);
echo.perform();
}
]]> </script>
</target>
</project>
and with this I get
BUILD FAILED
/tmp/js.xml:3: TypeError: invokeMember (createTask) on
org.apache.tools.ant.Project@3fc79729 failed due to: Unknown identifier:
createTask
at <js> :program(<eval>:3:51-76)
at org.graalvm.polyglot.Context.eval(Context.java:345)
so the engine has been loaded and has access to the Project instance but cannot
invoke the createTask method. I'll try to spend some more time with it at the
weekend, but maybe you can get a step further with the full list of
dependencies.
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You are receiving this mail because:
You are the assignee for the bug.
[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #6 from Stefan Bodewig <bo...@apache.org> ---
I've merged my changes to master and will discuss a few things I found out by
now on the dev list
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You are receiving this mail because:
You are the assignee for the bug.
[Bug 64469] Ant build.xml fails with "Unable to create javax script
engine for javascript" with latest JDK 15 due to removal of Nashorn
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=64469
--- Comment #1 from Stefan Bodewig <bo...@apache.org> ---
When I disabled the script tests for JDK 15+ I very quickly looked into using
grall,js instead - but it seemed to involve quite a bit more than I was willing
to chew on back then. Any helo is much appreciated.
BSF seems to be more or less dead - it has become part of the Apache Commons
Project but the last commit that changed anything but infrastructure stuff has
happened more than five years ago.
I believe, even when using graal.js the Ant ScriptRunner's "manager" should
still be "javax" as this is the API we are using. AFAIU graal.js is the
"language" you need to set. At least this is from a cursory glance at the
migration guide you link to. We call "createEngine" here
https://github.com/apache/ant/blob/master/src/main/org/apache/tools/ant/util/optional/JavaxScriptRunner.java#L193
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