java.security.KeyManagementException: Default SSLContext is initialized automatically

The default SSLContext is immutable. If you try to initiate it, it throws this exception.

SSLContext sc = SSLContext.getDefault();
sc.init(<the KeyManagers>, <the TrustManagers>, new SecureRandom());

The above code segment will throw the following exception.

java.security.KeyManagementException: Default SSLContext is initialized automatically
        at sun.security.ssl.SSLContextImpl$DefaultSSLContext.engineInit(SSLContextImpl.java:511)
        at javax.net.ssl.SSLContext.init(SSLContext.java:283)

To fix it, use a SSLContex associated with a specific protocol instead of using the default SSLContext. You can find all the SSLContext algorithm/protocol here.

For example

      SSLContext sc = SSLContext.getInstance("TLSv1.2"); 

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