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https://issues.apache.org/jira/browse/MANTRUN-200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16059904#comment-16059904
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Guillaume Boué edited comment on MANTRUN-200 at 6/22/17 8:46 PM:
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This can be reproduced for any plugin, not just the Antrun Plugin, so this may
be a Maven core concern. In any Mojo, doing
{code:java}
ServiceLoader.load(ScriptEngineFactory.class, classLoader).iterator().hasNext();
{code}
returns {{false}} when the {{classLoader}} used is the plugin class loader,
obtained with {{getClass().getClassLoader()}}.
However, when using the system class loader with
{{ClassLoader.getSystemClassLoader()}}, this call correctly returns {{true}}.
was (Author: gboue):
This can be reproduced for any plugin, not just the Antrun Plugin, so this may
be a Maven core concern.
> Scriptdef tasks fail to load when running on Java9
> --------------------------------------------------
>
> Key: MANTRUN-200
> URL: https://issues.apache.org/jira/browse/MANTRUN-200
> Project: Maven Antrun Plugin
> Issue Type: Bug
> Affects Versions: 1.8
> Reporter: Dan Berindei
>
> I have a Maven project using maven-antrun-plugin:
> {code}
> <?xml version='1.0' encoding='UTF-8'?>
> <project>
> <modelVersion>4.0.0</modelVersion>
> <artifactId>my-test-app</artifactId>
> <groupId>my-test-group</groupId>
> <version>1.0-SNAPSHOT</version>
> <build>
> <plugins>
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-antrun-plugin</artifactId>
> <version>1.8</version>
> <executions>
> <execution>
> <id>compile</id>
> <phase>compile</phase>
> <configuration>
> <target>
> <ant antfile="build.xml" inheritRefs="true">
> <target name="all"/>
> </ant>
> </target>
> </configuration>
> <goals>
> <goal>run</goal>
> </goals>
> </execution>
> </executions>
> </plugin>
> </plugins>
> </build>
> </project>
> {code}
> The Ant build file uses a script:
> {code}
> <?xml version='1.0' encoding='UTF-8'?>
> <project name="scriptdef-test-build">
> <scriptdef name="test-script" language="javascript">
> <![CDATA[
> var System = Java.type('java.lang.System');
> System.out.println("Working!");
> ]]>
> </scriptdef>
> <target name="all">
> <test-script/>
> </target>
> </project>
> {code}
> On Java 8 it works, but on Java 9 (9-ea+162) it can't find the script engine:
> {noformat}
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-antrun-plugin:1.8:run (compile) on
> project my-test-app: An Ant BuildException has occured: The following error
> occurred while executing this line:
> /home/dan/scriptdef-test/build.xml:10: Unable to create javax script engine
> for javascript
> around Ant part ...<ant antfile="build.xml" inheritRefs="true">... @ 4:47 in
> /home/dan/scriptdef-test/target/antrun/build-main.xml
> ...
> Caused by: /home/dan/scriptdef-test/build.xml:10: Unable to create javax
> script engine for javascript
> at
> org.apache.tools.ant.util.optional.JavaxScriptRunner.evaluateScript(JavaxScriptRunner.java:84)
> at
> org.apache.tools.ant.util.optional.JavaxScriptRunner.executeScript(JavaxScriptRunner.java:67)
> at
> org.apache.tools.ant.taskdefs.optional.script.ScriptDef.executeScript(ScriptDef.java:350)
> at
> org.apache.tools.ant.taskdefs.optional.script.ScriptDefBase.execute(ScriptDefBase.java:50)
> at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:547)
> at
> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
> at org.apache.tools.ant.Task.perform(Task.java:348)
> at org.apache.tools.ant.Target.execute(Target.java:435)
> at org.apache.tools.ant.Target.performTasks(Target.java:456)
> at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
> at
> org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
> at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
> at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:441)
> ... 34 more
> {noformat}
> I have attached a debugger and I saw that the {{ScriptEngineManager}} used by
> {{JavaxScriptRunner}} doesn't have any script engines, because the service
> loader it uses doesn't find any {{ScriptEngineFactory}} implementations. I
> have tried {{\--add-modules jdk.scripting.nashorn}} and {{\--add-opens
> jdk.scripting.nashorn/jdk.nashorn.api.scripting=ALL-UNNAMED}}, but neither
> helped.
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