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diff --git a/org.mihalis.opal/src/main/java/org/mihalis/opal/utils/StringUtil.java b/org.mihalis.opal/src/main/java/org/mihalis/opal/utils/StringUtil.java
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index 0000000..88ebdad
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+++ b/org.mihalis.opal/src/main/java/org/mihalis/opal/utils/StringUtil.java
@@ -0,0 +1,85 @@
+/*******************************************************************************
+ * Copyright (c) 2011 Laurent CARON
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Laurent CARON (laurent.caron at gmail dot com) - Initial implementation and API
+ *******************************************************************************/
+package org.mihalis.opal.utils;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+/**
+ * This class provides useful String manipulation methods.
+ */
+public class StringUtil {
+
+	/**
+	 * Returns a "safe" string representation. If source is null, return an
+	 * empty string
+	 * 
+	 * @param source source string
+	 * @return the string representation of the source (without space) if the
+	 *         source is not <code>null</code>, or an empty string otherwise
+	 */
+	public static String safeToString(final Object source) {
+		return source == null ? "" : source.toString().trim();
+	}
+
+	/**
+	 * Check if a string is empty or null.
+	 *
+	 * @param source source string
+	 * @return <code>true</code> is the string is empty or null,
+	 *         <code>false</code> otherwise
+	 */
+	public static boolean isEmpty(final String source) {
+		return source == null || source.trim().isEmpty();
+	}
+
+	/**
+	 * Converts exception stack trace as string.
+	 *
+	 * @param exception exception to convert
+	 * @return a string that contains the exception
+	 */
+	public static final String stackStraceAsString(final Throwable exception) {
+		final StringWriter stringWriter = new StringWriter();
+		exception.printStackTrace(new PrintWriter(stringWriter));	// NOSONAR
+		return stringWriter.toString();
+	}
+
+	/**
+	 * Insert a string in a middle of another string.
+	 *
+	 * @param source source string
+	 * @param newEntry string to insert into source
+	 * @param position position to insert source
+	 * @return the new string
+	 */
+	public static String insertString(final String source, final String newEntry, final int position) {
+		final StringBuilder sb = new StringBuilder();
+		sb.append(source.substring(0, position)).append(newEntry).append(source.substring(position));
+		return sb.toString();
+	}
+
+	/**
+	 * Remove a character in a String.
+	 *
+	 * @param source source string
+	 * @param position position of the character to remove
+	 * @return the string without the character
+	 */
+	public static String removeCharAt(final String source, final int position) {
+		final StringBuilder sb = new StringBuilder();
+		if (position == source.length()) {
+			return source;
+		}
+		sb.append(source.substring(0, position)).append(source.substring(position + 1));
+		return sb.toString();
+	}
+}