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  * Copyright 2006-2007 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
Helper class that sets up a System property with a default value. A System property is created with the specified key name, and default value (i.e. if the property already exists it is not changed).

Dave Syer
public class SystemPropertyInitializer implements InitializingBean {

Name of system property used by default.
	public static final String ENVIRONMENT = "";
	private String keyName = ;
	private String defaultValue;

Set the key name for the System property that is created. Defaults to ENVIRONMENT.

keyName the key name to set
	public void setKeyName(String keyName) {
		this. = keyName;

Mandatory property specifying the default value of the System property.

defaultValue the default value to set
	public void setDefaultValue(String defaultValue) {
		this. = defaultValue;

Sets the System property with the provided name and default value.

	public void afterPropertiesSet() throws Exception {
		Assert.state( != null || System.getProperty() != null,
				"Either a default value must be specified or the value should already be set for System property: "
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