问个ldap连接的问题

搞了一上午，还是没搞定，们帮忙看一下：

		Hashtable env = new Hashtable();
		
		env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
		env.put(Context.PROVIDER_URL, "ldap://192.168.0.100:389");
		env.put(Context.SECURITY_AUTHENTICATION, "simple");
		env.put(Context.SECURITY_PRINCIPAL, "admin");
		env.put(Context.SECURITY_CREDENTIALS, "password");

		try {
			new InitialLdapContext(env, null);
		}
		catch (NamingException e) {
			e.printStackTrace();
		}

可是为什么爆出如下异常：

javax.naming.InvalidNameException: [LDAP: error code 34 - Invalid DN Syntax]
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2926)
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2732)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2646)
at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:283)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:175)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:193)
at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:136)
at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:66)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)
at javax.naming.InitialContext.init(InitialContext.java:223)
at javax.naming.ldap.InitialLdapContext.<init>(InitialLdapContext.java:134)
at chb.test.database.TestTemp.main(TestTemp.java:35)