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Below lists some of the JDK internal APIs and the recommended way to replace their usage.

Component	Unsupported API (not for use)	Supported APIs (please use instead)	Note
java.awt.peer and java.awt.dnd.peer	TBD (JDK-8037739)	The AWT Peer API has been unsupported API and java.awt.peer.ComponentPeer interface depends on sun.* internal API.
core-libs	sun.sun.io	java.nio.charsets @since 1.4
	sun.misc.BASE64Decoder, sun.misc.BASE64Encoder, com.sun.org.apache.xml.internal.security.utils.Base64	java.util.Base64 @since 8	See http://openjdk.java.net/jeps/135
	sun.misc.ClassLoaderUtil	java.net.URLClassLoader.close() @since 7
	sun.misc.Cleaner	java.lang.ref.PhantomReference @since 1.2
	sun.misc.Service	java.util.ServiceLoader @since 1.6
	sun.misc.Timer	java.util.Timer @since 1.3
	sun.misc.Unsafe	sun.misc.Unsafe	consists of a number of use cases. The following features are identified to provide support in the future releases: JEP 193 Enhanced Volatile JEP 187 Serialization 2.0 Value types JEP 189 Shenandoah:Low-Pause GC Arrays 2.0 Layouts Project Panama JEP 191 FFI
	TBD	A JEP will be submitted to define a supported API	sun.reflect.Reflection.getCallerClass	TBD	A JEP will be submitted to define a supported API
security-libs	sun.security.action.*	java.security.PrivilegedAction to call System.getProperty or other action @since 1.1	AccessController.doPrivileged( (PrivilegedAction<String>) () -> System.getProperty(key));
	sun.security.krb5.*	Some provided in com.sun.security.jgss	If internal classes are used to get the session key of Krb5Context, we now have ExtendedGSSContext for this purpose. There are still many more functions not available yet.
	sun.security.util.SecurityConstants	java.lang.RuntimePermission, java.net.NetPermission, or specific Permission class @since 1.1
	sun.security.x509.X500Name	javax.security.auth.x500.X500Principal @since 1.4
com.sun.image.codec.jpeg.** sun.awt.image.codec	javax.imageio @since 1.4	See JDK-6527962
	com.sun.org.apache.xml.internal.security	javax.xml.crypto @since 1.6
	com.sun.net.ssl.**	javax.net.ssl @since 1.4
	security provider implementation class such as com.sun.net.ssl.internal.ssl.Provider sun.security.provider.Sun	java.security.Security.getProvider("SUN") @sine 1.3	In general, you should avoid depending on a specific provider as it may not be available on other Java implementations. See Oracle security providers documentation for more rationale.
	sun.security.provider.PolicyFile() or sun.security.provider.PolicyFile(URL)	java.security.Policy.getInstance("JavaPolicy", new java.security.URIParameter(uri)); @since 1.6
client-libs	java.awt.peer and java.awt.dnd.peer	TBD (JDK-8037739)	The AWT Peer API has been unsupported API and java.awt.peer.ComponentPeer interface depends on sun.* internal API.
	com.sun.image.codec.jpeg.** sun.awt.image.codec	javax.imageio @since 1.4	See JDK-6527962

jdbc	com.sun.rowset.**	javax.sql.rowset.RowSetProvider @since 7
compiler	com.sun.tools.javac.**	javax.tools, javax.lang.model @since 1.6 com.sun.source	com.sun.tools.javac.Main is a supported API.

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