The following comment has been added to this issue:
Author: John Casey
Created: Fri, 5 Sep 2003 8:28 AM
Body:
Didn't think there was a problem with emacs mode (-e) and embedded mode (-E) living
side by side, since the property option (-D) and the directory option (-d) are already
working together.
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View the issue:
http://jira.codehaus.org/secure/ViewIssue.jspa?key=MAVEN-784
Here is an overview of the issue:
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Key: MAVEN-784
Summary: Add "embedded mode" execution support for avoiding System.exit()
Type: New Feature
Status: Unassigned
Priority: Major
Time Spent: Unknown
Remaining: 30 minutes
Project: maven
Components:
core
Versions:
1.0-rc1
Assignee:
Reporter: John Casey
Created: Thu, 4 Sep 2003 11:00 PM
Updated: Thu, 4 Sep 2003 11:01 PM
Environment: any platform, executed from within a pre-existing JVM
Description:
Currently, when maven completes, it returns some error level, which allows users to
adjust the behavior of their scripts accordingly (as in the case of cron jobs and
such, I would imagine). It accomplishes this task by calling System.exit(status) with
the appropriate status code for the exit state of maven. Typically, this is a
_good_thing_.
However, when maven is called from within a running JVM, the System.exit() calls must
be parried with some sort of SecurityManager or such, in order to keep the maven
completion from bringing down the entire JVM and larger application. Another way
around this is to spawn a new JVM for each maven execution, but this is unacceptably
high in overhead, especially given the execution delay typically experienced while
maven works its magic behind the scenes.
My proposal is simple: create an embedded mode for maven, wherein System.exit() calls
are supressed.
In a typical application plugin, maven should be called by invoking Forehead with the
proper configuration. This avoids the duplication of complex classloader logic, and
maintains a single point of maintenance for the maven bootstrap process. In order to
create an embedded mode, all that need be done is to add an option to the CLI parsing,
(-E), and a boolean member variable in App.java which denotes which execution mode
we're running in. Then, in the exit(status) method of App.java, simply insert
conditional logic to check the execution mode, and supress System.exit() in embedded
mode. The rest of maven need not be touched in any way.
I am attaching a patch to this issue, which incorporates my ideas in concrete code.
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