with root cause java.lang.NoClassDefFoundError:Could not initialize class com.AlipaySubmit

网页集成支付宝报错 
with root cause

java.lang.NoClassDefFoundError: Could not initialize class com.AlipaySubmit 

一定要在根目录加上log文件夹
加完后在试
不行再用反射：
    ClassLoader loder = ClassLoader.getSystemClassLoader();

    Class<?> class1 = Class.forName("com.alipay.util.AlipaySubmit");

    Method setSampleMethod = class1.getMethod("buildRequest", java.util.Map.class,java.lang.String.class,java.lang.String.class); 

    sHtmlText =  (String)setSampleMethod.invoke(null,(Map)sParaTemp,(String)"post",(String)"确认");