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This topic is about Java 13 – Socket API Reimplementation.

Java 13 have reimplemented the Java Socket API. Old Socket APIs like java.net.Socket and java.net.ServerSocket has been replaced.

• PlainSocketImpl is no more in use, now the Socket API provider points to NioSocketImpl.
• New implementation leverages the java.nio infrastructure for better concurrency and i/o control.
• New implementation is backwards compatible with code using older implementation.
• New implementation is now default with Java 12.
• Old implementation can be selected by multiple ways:
  • Set system property jdk.net.usePlainSockteImpl to true.
  • Run java with -Djdk.net.usePlainSocketImpl option.
  • Update JDK network configuration file available in ${java.home}/conf/net.properties.
• Old implementation and system property to select old implementation will be removed from future release.

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