Owen Jacobson wrote:
> Hi folks,
>
> I'm working on upgrading a Maven plugin that runs Apache DS[0] to use the
> latest version of their software. Unfortunately, the latest version of
> their software does something slightly slack-jawed on startup: it inspects
> the java.class.path system property to locate JARs that contain core LDAP
> schemata. There is no alternate loader mechanism.
>
> When this happens inside a plugin, the java.class.path system property
> contains one JAR: Maven's own launcher JAR.
>
> I think the shortest path from where I am to working software is to fake
> up java.class.path before running Apache DS and then to reset it back to
> its "real" value after the server starts. However, in order to do this, I
> need to build a classpath-like string containing the JARs Apache DS needs.
>
> These JARs are already listed in the plugin's dependencies (and when the
> plugin runs, are available in the local repository). I'd like to use that
> information if possible, rather than hard-coding specific JAR names into
> the plugin. However, after spending half the day looking through various
> existing plugins, I'm no closer to doing this than I was this morning.
>
> 1. Is there a shortcut I missed that produces exactly the string (or list
> of JARs) I need? 2. If not, is there a reasonable way to obtain the
> dependency artifacts for a plugin? 3. If not, what's a better solution
> that doesn't involve patching Apache DS?
Extracts from the AbstractJaxwsMojo in the jaxws-maven-plugin at Codehaus
Mojo:
========= %< =========
List classpathFiles = project.getCompileClasspathElements();
URL[] urls = new URL[classpathFiles.size()];
StringBuffer classPath = new StringBuffer();
for ( int i = 0; i < classpathFiles.size(); ++i )
{
urls[i] = new File( (String) classpathFiles.get( i ) ).toURL().toURI();
classPath.append( (String) classpathFiles.get( i ) );
classPath.append( File.pathSeparatorChar );
}
URLClassLoader cl = new URLClassLoader( urls,
Thread.currentThread().getContextClassLoader() );
Thread.currentThread().setContextClassLoader( cl );
System.setProperty( "java.class.path", classPath.toString() );
========= %< =========
Obviously you should restore the classloader and system property later on.
- Jörg
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