When writing temporary projects, use more appropriate artifactIds

When we write a temporary project, it makes more sense to use the class'
name as artifactId than a semi-random directory name of the temporary
directory we just created.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

src/main/java/org/scijava/plugins/scripting/java/JavaEngine.java

@@ -369,7 +369,8 @@ private static MavenProject writeTemporaryProject(final BuildEnvironment env,
 		}
 
 		// write POM
-		return fakePOM(env, directory, fakeArtifactId(env, directory.getName()), mainClass);
+		final String artifactId = mainClass.substring(mainClass.lastIndexOf('.') + 1);
+		return fakePOM(env, directory, artifactId, mainClass, true);
 	}
 
 	private static String fakeArtifactId(final BuildEnvironment env, final String name) {