JndiPropertySource defensively skips invalid JNDI lookup for property name with colon in resource-ref mode

Issue: SPR-14518

spring-context/src/main/java/org/springframework/jndi/JndiPropertySource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -78,6 +78,15 @@ public class JndiPropertySource extends PropertySource<JndiLocatorDelegate> {
 	 */
 	@Override
 	public Object getProperty(String name) {
+		if (getSource().isResourceRef() && name.indexOf(':') != -1) {
+			// We're in resource-ref (prefixing with "java:comp/env") mode. Let's not bother
+			// with property names with a colon it since they're probably just containing a
+			// default value clause, very unlikely to match including the colon part even in
+			// a textual property source, and effectively never meant to match that way in
+			// JNDI where a colon indicates a separator between JNDI scheme and actual name.
+			return null;
+		}
+
 		try {
 			Object value = this.source.lookup(name);
 			if (logger.isDebugEnabled()) {