flume 启动报错

 如下：

java.lang.NumberFormatException: For input string: "44444 "
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:580)
	at java.lang.Integer.parseInt(Integer.java:615)
	at org.apache.flume.Context.getInteger(Context.java:162)
	at org.apache.flume.Context.getInteger(Context.java:180)
	at org.apache.flume.source.NetcatSource.configure(NetcatSource.java:140)
	at org.apache.flume.conf.Configurables.configure(Configurables.java:41)
	at org.apache.flume.node.AbstractConfigurationProvider.loadSources(AbstractConfigurationProvider.java:326)
	at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:97)

我配置的文件如下：

a1.sources=r1
a1.channels=c1
a1.sinks=s1

a1.sources.r1.type=netcat
a1.sources.r1.bind=0.0.0.0
a1.sources.r1.port=44444 
#描述a1的s1
a1.sinks.s1.type=logger
 

仔细看了很多遍，没错呀

最终发现是4444后面多了一个空格，这才导致识别成string