android import error: java.lang.ClassNotFoundException: Didn't find class "java.beans.Introspector"

[StevenCoober]

when i use your library in android, the error occured, this is the error in below, anyone can help me?

06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: log4j:WARN Error during default initialization
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/beans/Introspector;
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:140)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:772)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:735)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:615)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:502)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:547)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:483)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.LogManager.(LogManager.java:127)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.apache.log4j.LogManager.getLogger(LogManager.java:228)
06-11 16:51:22.511 8466-8466/org.cocos2dx.android W/System.err: at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)