Bug 14236 Unable to log info messages during jar packaging
Using the 04/18 Integration build, I still can't get an info message into the status maintained by JarFileExportOperation. In my JarWriter implementation, the close() method is throwing a CoreException which contains a status whose severity is set to IStatus.INFO. However, note that JarFileExportOperation.addToStatus() only accepts ERROR and WARNING (and only when they are being logged respectively which they are for my package data).
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarFileExportOperation.java
private void buildProjects(IProgressMonitor progressMonitor) {
		Set builtProjects= new HashSet(10);
		Object[] elements= fJarPackage.getElements();
		for (int i= 0; i < elements.length; i++) {
			IProject project= null;
			Object element= elements[i];
			if (element instanceof IResource)
				project= ((IResource)element).getProject();
			else if (element instanceof IJavaElement)
				project= ((IJavaElement)element).getJavaProject().getProject();
			if (project != null && !builtProjects.contains(project)) {
				try {
					project.build(IncrementalProjectBuilder.INCREMENTAL_BUILD, progressMonitor);
				} catch (CoreException ex) {
					String message= JarPackagerMessages.getFormattedString("JarFileExportOperation.errorDuringProjectBuild", project.getFullPath()); 
					addError(message, ex);
				} finally {
					
					builtProjects.add(project);
				}
			}
		}
	}
	/**
	 * Tells whether the given resource (or its children) have compile errors.
	 * The method acts on the current build state and does not recompile.
	 * 
	 * @param resource the resource to check for errors
	 * @return <code>true</code> if the resource (and its children) are error free
	 * @throws import org.eclipse.core.runtime.CoreException if there's a marker problem