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error while loading EhCache configuration

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i want to configure the ehcache.
but i m gettin error when i m loading catch:
code is like

InputStream fis=new FileInputStream(new File("C:\\Documents and Settings\\pravin_karne\\pravin_karne_view\\StartosHear\\src\\BILiveProCog\\pcs\\ehcache1.xml"))

CacheManager manager=new CacheManager(fis);
Cache cache=manager.getCache("sampleCache1"); //error is cache is null;

response on explore is like
java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/Executors

why this cache is null....i didnt get

thnx in advance
[ August 07, 2007: Message edited by: pravin karne ]
Posts: 10445
IntelliJ IDE Ubuntu
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java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/Executors

Looks like you dont have the required jar files in the classpath. Figure out which jar file contains the above class file and include that jar file in your application classpath.
It is sorta covered in the JavaRanch Style Guide.
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