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From Ashley Williams <ashpub...@mac.com>
Subject Re: Calling ant programatically
Date Mon, 27 Apr 2009 20:09:40 GMT
The really strange thing is that the virtual machine that launches the  
dos command does indeed
spawn correctly as I can see its process complete. I've even debugged  
it right to the very end.

So it seems that the grandparent process responsible for running the  
ant java task has some strange connection
with the grandchild dos command window:

      java.exe   --->   ant-java (fork=true, spawn=false)   --->   ant- 
exec (spawn=true)   --->   cmd.exe
      alive                    
alive                                                                
dead!!!                                         alive

On 27 Apr 2009, at 20:46, Ashley Williams wrote:

> Didn't make any difference. I did however get the stack trace from  
> the ant java task vm and the only non daemon thread
> dump looks like this:
>
> Thread [main] (Suspended)	
> 	ProcessImpl.waitFor() line: not available [native method]	
> 	Execute.waitFor(Process) line: 551	
> 	Execute.execute() line: 482	
> 	Java.fork(String[]) line: 784	
> 	Java.executeJava(CommandlineJava) line: 211	
> 	Java.executeJava() line: 132	
> 	Java.execute() line: 105	
> 	NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line:  
> not available [native method]	
> 	NativeMethodAccessorImpl.invoke(Object, Object[]) line: not  
> available	
> 	DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: not  
> available	
> 	Method.invoke(Object, Object...) line: not available	
> 	DispatchUtils.execute(Object) line: 106	
> 	Java(Task).perform() line: 348	
> 	Target.execute() line: 357	
> 	Target.performTasks() line: 385	
> 	Project.executeSortedTargets(Vector) line: 1337	
> 	Project.executeTarget(String) line: 1306	
> 	ProtoProject.antTest() line: 105	
> 	ProtoProject.main(String[]) line: 58	
>
>
>
>
> On 27 Apr 2009, at 20:13, Martin Gainty wrote:
>
>>
>> in your programmatic call what happens if you put in a
>> execTask.setFailonerror(true);
>> execTask.setFailIfExecutionFails(true);
>> http://api.dpml.net/ant/1.7.0/org/apache/tools/ant/taskdefs/ExecTask.html#setFailIfExecutionFails(boolean)
>>
>> before the execute()
>>
>> public static void main(String[] args) throws IOException
>> {
>> // top level project
>> Project project = new Project();
>> project.setName("project");
>> project.init();
>>
>> // project has a target child
>> Target target = new Target();
>> target.setName("target");
>> project.addTarget(target);
>>
>> // target has an exec child
>> ExecTask execTask = new ExecTask();
>> execTask.setProject(project);
>> execTask.setExecutable("cmd.exe");
>>
>> execTask.setSpawn(true);
>>
>> execTask.setDir(new File("."));
>>
>> addArg(execTask, "/c");
>>
>> addArg(execTask, "start");
>>
>> addArg(execTask, "test.bat");
>>
>> execTask.setFailonerror(true);
>> execTask.setFailIfExecutionFails(true);
>>
>> target.addTask(execTask);
>> target.execute();
>>
>> }
>> ?
>> Martin
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>>
>>> From: ashpublic@mac.com
>>> To: user@ant.apache.org
>>> Subject: Re: Calling ant programatically
>>> Date: Mon, 27 Apr 2009 18:42:04 +0100
>>>
>>> Ok here's a little more context.
>>>
>>> It seems that the exec/spawn=true command works as expected when
>>> called on its own directly from java.exe
>>> but not from an intermediate ant java task, so:
>>>
>>> 1. GOOD... When I launch the cmd.exe from a programmatic ant exec
>>> task, the exec task and java.exe both complete, and the dos window
>>> remains until I close it ( I've left a large gap in the chain
>>> description so it lines up with the next example):
>>>
>>>
>>>
>>>    java.exe   ---
>>>>
>>>                                                                          ant
>>> -exec (spawn=true)   --->   cmd.exe
>>>    (terminates before dos cmd.exe window is closed)
>>>
>>>
>>> 2. BAD... When I insert an programmatic ant java task, the exec task
>>> appears to complete but the ant java task doesn't. Then when
>>> I close the dos window the java.exe process completes also. This is
>>> despite the ant-exec spawn attribute being true.
>>>
>>>
>>>
>>>    java.exe   --->   ant-java (fork=true, spawn=false)   --->   ant-
>>> exec (spawn=true)   --->   cmd.exe
>>>    (terminates only when dos cmd.exe window is closed)
>>>
>>>
>>> I know it looks a little unusual to have the extra ant-java task in
>>> there but it is necessary for my use-case and I don't have
>>> the option to set spawn to true for it. Any ideas?
>>>
>>> Many Thanks
>>> - Ashley
>>>
>>>
>>> On 24 Apr 2009, at 13:20, Ashley Williams wrote:
>>>
>>>> Hi,
>>>>
>>>> I  would like to know how to start a batch file in a new dos window
>>>> without blocking the java process and so naturally I
>>>> tried the following that does work:
>>>>
>>>> <project name="project" default="target" basedir=".">
>>>> <target name="target">
>>>> 	  <exec executable="cmd" spawn="true" dir="${basedir}">
>>>> 	    <arg value="/c"/>
>>>> 	    <arg value="start"/>
>>>> 	    <arg value="test.bat"/>
>>>> 	  </exec>
>>>> </target>
>>>> </project>
>>>>
>>>> However I need to be able to do this from java and so I used the
>>>> following snippet of code that I thought would
>>>> represent the same functionality as the ant script:
>>>>
>>>> public static void main(String[] args) throws IOException {
>>>> 	// top level project
>>>> 	Project project = new Project();
>>>> 	project.setName("project");
>>>> 	project.init();
>>>>
>>>> 	// project has a target child
>>>> 	Target target = new Target();
>>>> 	target.setName("target");
>>>> 	project.addTarget(target);
>>>> 	
>>>> 	// target has an exec child
>>>> 	ExecTask execTask = new ExecTask();
>>>> 	execTask.setProject(project);
>>>> 	target.addTask(execTask);
>>>> 	execTask.setExecutable("cmd.exe");
>>>> 	execTask.setSpawn(true);
>>>> 	execTask.setDir(new File("."));
>>>> 	addArg(execTask, "/c");
>>>> 	addArg(execTask, "start");
>>>> 	addArg(execTask, "test.bat");
>>>> 	target.execute();
>>>> }
>>>>
>>>> However it doesn't matter whether or not I set true of false for  
>>>> the
>>>> spawn property the java process blocks
>>>> every time until I close the dos window by hand. Is there something
>>>> else I need to do to more closely
>>>> replicate the ant script?
>>>>
>>>> Cheers
>>>> - Ashley
>>>>
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>>>
>>>
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>>
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