Welche Anforderungen stellt Ant an Attributnamen?

Question

Ich kann mein Scriptdef ausführen, aber nur wenn ich bestimmte Namen für meine Attribute verwende. Anscheinend sind Namen wie "property" und "prop1", "prop2" usw. in Ordnung, aber die meisten anderen Namen (einschließlich "propN") sind nicht in Ordnung. Welche sind OK und warum?

Das funktioniert (unter Verwendung von Attributnamen prop2):

<project name="Ant Is Weird"> 
    <property name="hostname" value="abc-de-fghijk0.lmn.opqr.stu"/> 

    <scriptdef name="hostSubstring" language="javascript"> 
    <attribute name="text" /> 
    <attribute name="prop1" /> 
    <attribute name="prop2" /> 
    <![CDATA[ 
     var hn = attributes.get("text"); 
     project.setProperty(attributes.get("prop1"), hn.replace(/[^0-9]/g,"")); 
     project.setProperty(attributes.get("prop2"), hn.replace(/[^0-9]/g,"")); 
     ]]> 
    </scriptdef> 

    <target name="test" description="helps me learn about scriptdef"> 
    <echo message="hostname is ${hostname}"/> 
    <hostSubstring text="${hostname}" prop1="firstProp" prop2="secondProp"/> 
    <echo message="firstProp is ${firstProp}" /> 
    <echo message="secondProp is ${secondProp}" /> 
    </target> 
</project> 

Ausgang:

$ ant test 
Buildfile: /apps/antTest/build.xml 

test: 
    [echo] hostname is abc-de-fghijk0.lmn.opqr.stu 
    [echo] firstProp is 0 
    [echo] secondProp is 0 

BUILD SUCCESSFUL 
Total time: 0 seconds 

Aber dies fehlschlägt (mit Attributnamen propN) :

<project name="Ant Is Weird"> 
    <property name="hostname" value="abc-de-fghijk0.lmn.opqr.stu"/> 

    <scriptdef name="hostSubstring" language="javascript"> 
    <attribute name="text" /> 
    <attribute name="prop1" /> 
    <attribute name="propN" /> 
    <![CDATA[ 
     var hn = attributes.get("text"); 
     project.setProperty(attributes.get("prop1"), hn.replace(/[^0-9]/g,"")); 
     project.setProperty(attributes.get("propN"), hn.replace(/[^0-9]/g,"")); 
     ]]> 
    </scriptdef> 

    <target name="test" description="helps me learn about scriptdef"> 
    <echo message="hostname is ${hostname}"/> 
    <hostSubstring text="${hostname}" prop1="firstProp" propN="secondProp"/> 
    <echo message="firstProp is ${firstProp}" /> 
    <echo message="secondProp is ${secondProp}" /> 
    </target> 
</project> 

output:

$ ant test 
Buildfile: /apps/antTest/build.xml 

test: 
    [echo] hostname is abc-de-fghijk0.lmn.opqr.stu 

BUILD FAILED 
/apps/antTest/build.xml:17: java.lang.NullPointerException 
     at java.util.Hashtable.containsKey(Hashtable.java:335) 
     at org.apache.tools.ant.PropertyHelper.setProperty(PropertyHelper.java:640) 
     at org.apache.tools.ant.Project.setProperty(Project.java:538) 
     at jdk.nashorn.internal.scripts.Script$\^eval\_.:program(<eval>:8) 
     at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637) 
     at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494) 
     at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393) 
     at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:446) 
     at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:403) 
     at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:399) 
     at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155) 
     at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:498) 
     at org.apache.tools.ant.util.ReflectUtil.invoke(ReflectUtil.java:108) 
     at org.apache.tools.ant.util.ReflectWrapper.invoke(ReflectWrapper.java:81) 
     at org.apache.tools.ant.util.optional.JavaxScriptRunner.evaluateScript(JavaxScriptRunner.java:103) 
     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:291) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:498) 
     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:390) 
     at org.apache.tools.ant.Target.performTasks(Target.java:411) 
     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399) 
     at org.apache.tools.ant.Project.executeTarget(Project.java:1368) 
     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) 
     at org.apache.tools.ant.Project.executeTargets(Project.java:1251) 
     at org.apache.tools.ant.Main.runBuild(Main.java:809) 
     at org.apache.tools.ant.Main.startAnt(Main.java:217) 
     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280) 
     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109) 

Total time: 0 seconds 

Falls es wichtig ist:

$ cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.8 (Santiago) 
$ ant -version 
Apache Ant(TM) version 1.8.2 compiled on December 20 2010 

Answer 1

Die Eigenschaftswerte sind niedriger gefasste automatisch. Ich fand dies aus, indem

self.log(attributes); 

in das Skript setzen.

Also, wenn Sie Ihren Skript ändern propn statt propN zu verwenden, funktioniert es:

project.setProperty(attributes.get("propn"), hn.replace(/[^0-9]/g,"")); 

Dies wird dokumentiert in dem Scriptdef task documentation:

Hinweis: Ant wird alle Attribute und Elementnamen werden zu alle Kleinbuchstaben, selbst wenn Sie name="SomeAttribute" verwenden, müssen Sie "someattribute" verwenden, um den Wert des Attributs aus der Attributsammlung abzurufen.