tomcat - error in running java file -


i making webapp using tomcat having problems in running in windows...there java file(thread.java) runs java file(emaildownload.java) first need directory in class file stored ...i using 

this.getclass().getclassloader().getresource("").getpath();

for getting class path...and running file by:

thread foo=new thread(); foo.runprocess("java mainclasses.emaildownload "+credentials[0]+" "+credentials[1]+" "+credentials[2]+" "+credentials[3]+" ");

file structure: c:\program files\apache software foundation\tomcat 8.0\webapps\mazil3.0\web-inf\classes\mainclasses\emaildownload.class , mainclasses package...
getting error:

java.lang.noclassdeffounderror: javax/mail/uidfolder     @ java.lang.class.getdeclaredmethods0(native method)     @ java.lang.class.privategetdeclaredmethods(unknown source)     @ java.lang.class.getmethod0(unknown source)     @ java.lang.class.getmethod(unknown source)     @ sun.launcher.launcherhelper.validatemainclass(unknown source)     @ sun.launcher.launcherhelper.checkandloadmain(unknown source)   caused by: java.lang.classnotfoundexception: javax.mail.uidfolder     @ java.net.urlclassloader$1.run(unknown source)     @ java.net.urlclassloader$1.run(unknown source)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     @ sun.misc.launcher$appclassloader.loadclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     ... 6 more

i don't understand why error coming?

interface uidfolder belongs javax.mail package since saying noclassdeffounderror might not having javamail api in classpath .get here


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