使用birt开发表格初始化runtime报错

public class TestReportEngine {
	private static EngineConfig config;
	public static final String BIRT_HOME = "D:/work/birt-runtime-4_2_2/ReportEngine";

	public static void main(String[] args) {
		try {
			config = new EngineConfig();
			config.setEngineHome(BIRT_HOME);
			Platform.startup(config);
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

}

Exception in thread "main" java.lang.NoClassDefFoundError: com/ibm/icu/util/UResourceBundle
	at org.eclipse.birt.core.framework.osgi.OSGILauncher.doStartup(OSGILauncher.java:123)
	at org.eclipse.birt.core.framework.osgi.OSGILauncher.access$0(OSGILauncher.java:94)
	at org.eclipse.birt.core.framework.osgi.OSGILauncher$1.run(OSGILauncher.java:79)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.eclipse.birt.core.framework.osgi.OSGILauncher.startup(OSGILauncher.java:75)
	at org.eclipse.birt.core.framework.Platform.startup(Platform.java:80)
	at TestReportEngine.main(TestReportEngine.java:17)
Caused by: java.lang.ClassNotFoundException: com.ibm.icu.util.UResourceBundle
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
	... 7 more