src/tests/antunit/script-prereq-check.xml

<?xml version="1.0"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      https://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<project name="script-prereq-check">
  <condition property="prereqs-ok">
    <and>
      <!-- Starting Java 15, there's no "javascript" script engine (not even nashorn) bundled in JRE -->
      <javaversion atmost="14"/>
      <or>
        <and>
          <available classname="org.apache.bsf.BSFManager" />
          <available classname="org.apache.bsf.engines.javascript.JavaScriptEngine" />
        </and>
        <available classname="javax.script.ScriptEngineManager" />
      </or>
    </and>
  </condition>

  <!-- auto doesn't verify the language is supported and selects BSF
       even if the JavaScriptEngine is not there -->
  <condition property="script.manager" value="javax">
    <and>
      <not>
        <available classname="org.apache.bsf.engines.javascript.JavaScriptEngine" />
      </not>
      <isset property="prereqs-ok"/>
    </and>
  </condition>
  <property name="script.manager" value="auto" />
</project>