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The only difference between 2.5.6 and 2.5.6.A is the packaging. Spring 2.5.6.A is packaged for use in an OSGi environment like SpringSource dm Server. All dependencies for 2.5.6.A are resolved from the SpringSource Enterprise Bundle Repository (see the FAQ for more detail). This repository is also used for the Spring Batch build.
We realize that everyone doesn't need the OSGi ready libraries and we provide jars for the Maven Central Repository as well. These jars have standard maven dependencies.
You should pick either the SpringSource Enterprise Bundle Repository OR the Maven Central Repository for your aplication's dependencies since mixing them will create duplication in terms of dependency resolution.