java.security.KeyStoreException: Uninitialized keystore

The code below will generate the exception.

KeyStore ks = KeyStore.getInstance("JKS");
KeyManagerFactory kmf = KeyManagerFactory.getInstance(
      KeyManagerFactory.getDefaultAlgorithm());
kmf.init(ks, "<keystore password>".toCharArray());

When you execute a program containing the above code segment, you will get the exception.

java.security.KeyStoreException: Uninitialized keystore
        at java.security.KeyStore.aliases(KeyStore.java:1002)
        at sun.security.ssl.SunX509KeyManagerImpl.<init>(SunX509KeyManagerImpl.java:125)
        at sun.security.ssl.KeyManagerFactoryImpl$SunX509.engineInit(KeyManagerFactoryImpl.java:68)
        at javax.net.ssl.KeyManagerFactory.init(KeyManagerFactory.java:259)

This is because the KeyStore used to initialize the KeyManagerFactory is not initialized itself. The following code will initialize the KeyStore.

KeyStore ks = KeyStore.getInstance("JKS");
InputStream readCert = new FileInputStream("<path>/<keystore name>");
 try {
        ks.load(readCert, "<keystore password>".toCharArray());
 } finally {
        readCert.close();
 }

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