Anxious ~ Online ! maven compile error "can not find symbol "

pom.xml configuration

  <parent>
  	<groupId>com.hxsmart.sicard</groupId>
  	<artifactId>sicard</artifactId>
  	<version>1.0-SNAPSHOT</version>
  	<relativePath>../pom.xml</relativePath>
  </parent>
  

given as follows:

E: \ workspace \ iccardcore \ mis \ src \ main \ java \ com \ hxsmart \ sicard \ core \ webapp \ action \
process \ DayEndProcessBean.java: [298,65] can not find symbol
symbol : variable autoTapeFile
Location: class com.hxsmart.framework.webapp.util.Constant

E: \ workspace \ iccardcore \ mis \ src \ main \ java \ com \ hxsmart \ sicard \ core \ webapp \ action \
process \ DayEndProcessBean.java: [298,118] can not find symbol
symbol : variable autoTapeFile
Location: class com.hxsmart.framework.webapp.util.Constant

E: \ workspace \ iccardcore \ mis \ src \ main \ java \ com \ hxsmart \ sicard \ core \ schedule \ DayEn
dJob.java: [94,66] can not find symbol
symbol : variable autoTapeFile
Location: class com.hxsmart.framework.webapp.util.Constant

E: \ workspace \ iccardcore \ mis \ src \ main \ java \ com \ hxsmart \ sicard \ core \ schedule \ DayEn
dJob.java: [94,119] can not find symbol
symbol : variable autoTapeFile
Location: class com.hxsmart.framework.webapp.util.Constant


In Constant in :

  public static String autoTapeFile= "/home/sybase/";
  

tried many methods are not resolved, maven unfamiliar, experts hope to answer, thank you !

------ Solution ------------------------------------ --------
Java code and compiled to ensure there is no problem under the premise , the use of projec-> clean-> cleanAll clean up , and then try the next
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code in eclipse compiler no problem, also cleaned up , or being given
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I have encountered this problem , toss me a long time , and depressed . . . .
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resolved, ha ha , lz can mvn install sicard package
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clean after like , but why?
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how to solve ah ! QQ243992112 seeking guidance
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first run mvn clean
then execute mvn command such as : mvn compile, mvn install, mvn deploy
no problems
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I also encountered this problem , clean enough after
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my clean, clean all will not work, now is not good, depressed ah , seeking Daren advice , is certainly character encoding is wrong, but the set is UTF-8 , and have checked ah.
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use projec-> clean-> cleanAll clean , really good , why