java.lang.NoClassDefFoundError: net/sf/ehcache/concurrent/ConcurrencyUtil

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java.lang.NoClassDefFoundError: net/sf/ehcache/concurrent/ConcurrencyUtil
at net.sf.ehcache.store.DiskStore.selectRandomAccessFile(DiskStore.java:328)
at net.sf.ehcache.store.DiskStore.loadElementFromDiskElement(DiskStore.java:333)
at net.sf.ehcache.store.DiskStore.expireElements(DiskStore.java:992)
at net.sf.ehcache.store.DiskStore.throwableSafeExpireElementsIfRequired(DiskStore.java:691)
at net.sf.ehcache.store.DiskStore.spoolAndExpiryThreadMain(DiskStore.java:679)
at net.sf.ehcache.store.DiskStore.access$900(DiskStore.java:74)

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