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diff --git a/osgi/runtime/org.argeo.osgi.boot/src/main/java/org/argeo/osgi/boot/internal/springutil/SystemPropertyUtils.java b/osgi/runtime/org.argeo.osgi.boot/src/main/java/org/argeo/osgi/boot/internal/springutil/SystemPropertyUtils.java
new file mode 100644
index 000000000..f81adc25b
--- /dev/null
+++ b/osgi/runtime/org.argeo.osgi.boot/src/main/java/org/argeo/osgi/boot/internal/springutil/SystemPropertyUtils.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2002-2008 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.argeo.osgi.boot.internal.springutil;
+
+/**
+ * Helper class for resolving placeholders in texts. Usually applied to file paths.
+ *
+ * <p>A text may contain <code>${...}</code> placeholders, to be resolved as
+ * system properties: e.g. <code>${user.dir}</code>.
+ *
+ * @author Juergen Hoeller
+ * @since 1.2.5
+ * @see #PLACEHOLDER_PREFIX
+ * @see #PLACEHOLDER_SUFFIX
+ * @see System#getProperty(String)
+ */
+public abstract class SystemPropertyUtils {
+
+	/** Prefix for system property placeholders: "${" */
+	public static final String PLACEHOLDER_PREFIX = "${";
+
+	/** Suffix for system property placeholders: "}" */
+	public static final String PLACEHOLDER_SUFFIX = "}";
+
+
+	/**
+	 * Resolve ${...} placeholders in the given text,
+	 * replacing them with corresponding system property values.
+	 * @param text the String to resolve
+	 * @return the resolved String
+	 * @see #PLACEHOLDER_PREFIX
+	 * @see #PLACEHOLDER_SUFFIX
+	 */
+	public static String resolvePlaceholders(String text) {
+		StringBuffer buf = new StringBuffer(text);
+
+		int startIndex = buf.indexOf(PLACEHOLDER_PREFIX);
+		while (startIndex != -1) {
+			int endIndex = buf.indexOf(PLACEHOLDER_SUFFIX, startIndex + PLACEHOLDER_PREFIX.length());
+			if (endIndex != -1) {
+				String placeholder = buf.substring(startIndex + PLACEHOLDER_PREFIX.length(), endIndex);
+				int nextIndex = endIndex + PLACEHOLDER_SUFFIX.length();
+				try {
+					String propVal = System.getProperty(placeholder);
+					if (propVal == null) {
+						// Fall back to searching the system environment.
+						//propVal = System.getenv(placeholder);// mbaudier - 2009-07-26
+						throw new Error("getenv no longer supported, use properties and -D instead: " + placeholder);
+					}
+					if (propVal != null) {
+						buf.replace(startIndex, endIndex + PLACEHOLDER_SUFFIX.length(), propVal);
+						nextIndex = startIndex + propVal.length();
+					}
+					else {
+						System.err.println("Could not resolve placeholder '" + placeholder + "' in [" + text +
+								"] as system property: neither system property nor environment variable found");
+					}
+				}
+				catch (Throwable ex) {
+					System.err.println("Could not resolve placeholder '" + placeholder + "' in [" + text +
+							"] as system property: " + ex);
+				}
+				startIndex = buf.indexOf(PLACEHOLDER_PREFIX, nextIndex);
+			}
+			else {
+				startIndex = -1;
+			}
+		}
+
+		return buf.toString();
+	}
+
+}