https://bz.apache.org/bugzilla/show_bug.cgi?id=58271
Bug ID: 58271
Summary: script task implementation should use reflection API
to find if javax.script.ScriptEngineManager is
available
Product: Ant
Version: 1.9.5
Hardware: All
Status: NEW
Severity: normal
Priority: P2
Component: Optional Tasks
Assignee: [email protected]
Reporter: [email protected]
Based on reading 1.9.5 sources:
http://grepcode.com/file/repo1.maven.org/maven2/org.apache.ant/ant/1.9.5/org/apache/tools/ant/util/ScriptRunnerCreator.java#ScriptRunnerCreator.createRunner%28java.lang.String%2Cjava.lang.String%2Cjava.lang.String%29
http://grepcode.com/file/repo1.maven.org/maven2/org.apache.ant/ant/1.9.5/org/apache/tools/ant/util/LoaderUtils.java#LoaderUtils.classNameToResource%28java.lang.String%29
I find that <script> task implementation uses ClassLoader.getResource is used
to locate a .class resource URL. Based on whether that returns null or not,
ScriptRunnerBase is created. But per documentation of ClassLoader.getResource
(http://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html#getResource-java.lang.String-),
getResource is meant for only audio/text etc. - / A resource is some data
(images, audio, text, etc) that can be accessed by class code in a way that is
independent of the location of the code./ Never talks about ".class" 'file' as
a resource. Besides, reflection API may be used to check if
javax.script.ScriptEngineManager class is available or not in the JDK.
ClassLoader.getResource on .class resource can be avoided.
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