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JDK-6260652 may affect code that relies on the Arrays.asList(x).toArray() implementation to return a clone of the backing array, which might be a String[], for example, instead of returning an Object[], as specified.

Create PKCS12 Keystores by Default

JEP 229 may affect code that uses keystores. It changes the default keystore type from JKS to PKCS12. By default, new keystores will be created in the PKCS12 keystore format. Existing keystores will not change and keystore applications can continue to explicitly specify the keystore type they require. 

Modular Run-Time Images

JEP 220 may affect code that relies on the removed endorsed-standards override mechanism, the removed extension mechanism, and the existence of rt.jar and tools.jar files as well as the old directory layout of files in the JDK & JRE installation image.

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JEP 252 may affect code that uses locale-sensitive services such as date, time, and number formatting which may behave differently for locales not supported in JDK 8.

UTF-8 Property Files

JEP 226 may affect code that loads property files. It defines a means for applications to specify property files encoded in UTF-8, and extends the ResourceBundle API to load them by default.

Removed

Remove GC Combinations Deprecated in JDK 8

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