changed JPA dependency to provided

Added additional annotation to test interface to make sure no ClassCastException appears.

ConversionService fully supports conversion from String to MediaType now (through 'valueOf'; SPR-7282); revised exception handling in ObjectToObjectConverter, avoiding InvocationTargetExceptions

DefaultListableBeanFactory checks for alias circle on registerAlias (avoiding endless loop; SPR-7274)

revised Portlet SessionStatus.setComplete() to avoid re-exposure of attributes in render phase (SPR-6126); shortened implicit model render parameter name to "implicitModel" (SPR-7149)

SPR-7263 - TypeMismatchException instead of IllegalArgumentException: argument type mismatch for wrong RequestBody

SPR-7263 - TypeMismatchException instead of IllegalArgumentException: argument type mismatch for wrong RequestBody

revised DefaultLifecycleProcessor's handling of circular dependencies to avoid stack overflow (SPR-7266)

added XmlAwareFormHttpMessageConverter, taking over the 3.0.2-introduced XML multipart support (avoiding a package cycle)

added XmlAwareFormHttpMessageConverter, taking over the 3.0.2-introduced XML multipart support (avoiding a package cycle)

registerDependentBean resolves to the canonical bean name in order to handle alias references (SPR-7254)

added "expose-proxy" attribute to aop namespace (enforcing AopContext proxy exposure with CGLIB; SPR-7261)

added "expose-proxy" attribute to aop namespace (enforcing AopContext proxy exposure with CGLIB; SPR-7261)