JDK installation path has spaces not ?

JDK or JRE installation path with spaces does not work ? I have installed , how do ? netbeans normal use , compile something out of the java command in the command line will not work :
Exception in thread "main" java.lang.NoClassDefFoundError: JavaApplicationTest
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find classes.
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put the installation has been installed uninstall a heavy chant
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remember to use the command line parameters classpath

you did not find this class
Exception in thread "main" java.lang.NoClassDefFoundError: JavaApplicationTest
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I do not reload , but the path has moved , changed environment variables. Or why not , jre environment variables in addition there are other registration information you ?
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unloading, again, and Bu trouble .
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I do not reload , but the path has moved , changed environment variables. Or why not , jre environment variables in addition there are other registration information you ?  
nothing relationship with the environment variable , say that you do not set this parameter classpath
you still take a look at the official documentation to see how to use it java command
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/java.html
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I do not reload , but the path has moved , changed environment variables. Or why not , jre environment variables in addition there are other registration information you ?          
nothing relationship with the environment variable , say that you do not set this parameter classpath   
you still take a look at the official documentation to see how to use it java command   
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/java.html  
set classpath this parameter is not OK .
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busy on the re Come
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reinstalled , still the same .
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kill environment variable CLASSPATH, now the jdk do not need it anymore.


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killed, still the same .
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jdk-7u40-windows-i586.exe installation file in the installation process, the default path is X: \ Program Files \, it does not detect whether the path contains a space , a space is not that it does not matter . Otherwise the sun and oracle too tmd anything. Think this would lead to what ? All windows!
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resolved, there are code package javaapplicationtest;
command should be in the upper level directory , java javaapplicationtest / JavaApplicationTest