这个读取文件的代码有没有问题？：报错

public class GetProperties {
	private static Properties config = null;
	static {
		InputStream in = GetProperties.class.getClassLoader()
				.getResourceAsStream("default.properties");
		config = new Properties();
		try {
			config.load(in);
			in.close();
		} catch (IOException e) {
			System.out.println("No default.properties defined error!");
		}
	}
	// 根据key读取value
	public static String readValue(String key) {
		try {
			String value = config.getProperty(key);
			return value;
		} catch (Exception e) {
			e.printStackTrace();
			System.err.println("ConfigInfoError" + e.toString());
			return null;
		}
	}
	// 读取properties的全部信息
	public static void readAllProperties() {
		try {
			@SuppressWarnings("rawtypes")
			Enumeration en = config.propertyNames();
			while (en.hasMoreElements()) {
				String key = (String) en.nextElement();
				String Property = config.getProperty(key);
				System.out.println(key +": "+ Property);
			}
		} catch (Exception e) {
			e.printStackTrace();
			System.err.println("ConfigInfoError" + e.toString());
		}
	}
}

请大家帮我分析下 这样读取文件信息会不会有泄露的问题？