Update the CXF bundle of "net.sf.ehcache" importing to be optional
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Key: CXF-4211
URL: https://issues.apache.org/jira/browse/CXF-4211
Project: CXF
Issue Type: Improvement
Components: OSGi
Reporter: Willem Jiang
Assignee: Willem Jiang
Fix For: 2.4.7, 2.5.3, 2.6
CXF-1636 introduced the dependency of ehcache-core, we need to update the bnd
configuration to set the package to be optional.
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