How Do I Specify Keystore and Certificate Locations for SSL in Java?

SSL and Certificate Keystore

Java programs rely on SSL to establish secure connections, but they need to know where to find the keystore containing the necessary certificate.

Specifying the Keystore Location

SSL properties are set at the JVM level through system properties. You can specify these in two ways:

1. Command Line: When launching the program, use the -D option to set properties. For example:

   java -Djavax.net.ssl.keyStore=/path/to/keystore.jks

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2. Code: Use System.setProperty to set properties in code. For example:

   System.setProperty("javax.net.ssl.keyStore", "/path/to/keystore.jks");

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Specifying the Certificate to Use

Once the keystore is identified, you can specify the certificate to use for server authentication. The javax.net.ssl.keyAlias property is used for this purpose. It specifies the alias of the certificate within the keystore. For example:

java -Djavax.net.ssl.keyAlias=myCertificate

or

System.setProperty("javax.net.ssl.keyAlias", "myCertificate");

SSL System Properties

The following summarizes the key SSL system properties:

• javax.net.ssl.keyStore: Path to the keystore containing the certificate and private key.
• javax.net.ssl.keyStorePassword: Password for the keystore (used both for store and key decryption).
• javax.net.ssl.trustStore: Path to the truststore containing trusted CA certificates.
• javax.net.ssl.trustStorePassword: Password for the truststore.
• javax.net.ssl.keyAlias: Alias of the certificate to use for server authentication.

By setting these properties, Java programs can leverage SSL effectively to establish secure connections.

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