Application: gvSIG desktop

import java.util.Iterator;

import java.util.List;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.app.project.documents.view.toc.actions.ShowLayerErrorsTocMenuEntry;

        @Override

            NotificationManager.addError(getMessages(t), t);

        private class ExceptionIterator implements Iterator {

            Throwable exception;

            ExceptionIterator(Throwable exception) {

                this.exception = exception;

            }

            @Override

            public boolean hasNext() {

                return this.exception != null;

            }

            @Override

            public Object next() {

                Throwable exception = this.exception;

                this.exception = exception.getCause();

                return exception;

            }

            @Override

            public void remove() {

                throw new UnsupportedOperationException();

            }

        }

        private String getMessages(Throwable ex) {

            StringBuilder msg = new StringBuilder();

            boolean firstline = true;

            Iterator exceptions = new ExceptionIterator(ex);

            String lastmsg = "";

            while (exceptions.hasNext()) {

                Throwable ex1 = ((Throwable) exceptions.next());

                String message;

                message = ex1.getMessage();

                if ( !StringUtils.isEmpty(message) ) {

                    if( firstline ) {

                        msg.append(message);

                        msg.append("\n\n");

                        firstline = false;

                    } else {

                        if (!message.equalsIgnoreCase(lastmsg)) {

                            msg.append("- ");

                            msg.append(message.replace("\n","\n  "));

                            msg.append("\n");

                        }

                    }

                    lastmsg = message;

                }

            }

            return msg.toString();

        }