Java V4 Configuration API Reference for Realtime Apps

Java V4 complete API reference for building Realtime Applications on PubNub, including basic usage and sample code.

Configuration

Description

PNConfiguration instance is storage for user-provided information which describe further PubNub client behavior. Configuration instance contain additional set of properties which allow to perform precise PubNub client configuration.

Method(s)

To create configuration instance you can use the following function in the Java V4 SDK:

1. new PNConfiguration();
   

   Properties	Type	Required	Defaults	Description
   setSubscribeKey	String	Yes		subscribeKey from the Admin Portal.
   setPublishKey	String	Optional		publishKey from the Admin Portal (only required if publishing).
   setSecretKey	String	Optional		secretKey (only required for access operations, keep away from Android).
   setCipherKey	String	Optional		If cipher is passed, all communications to and from PubNub will be encrypted.
   setUuid	String	Yes	SDK generated uuid	UUID to use. You should set a unique UUID to identify the user or the device that connects to PubNub. Allowing the SDK to generate a random UUID can result in significant billing impacts, particularly on an MAU pricing plan.
   setLogVerbosity	PNLogVerbosity	Optional	PNLogVerbosity.NONE	Set PNLogVerbosity.BODY to enable debugging. To disable debugging use the option PNLogVerbosity.NONE
   setAuthKey	String	Optional	Not set	If Access Manager is utilized, client will use this authKey in all restricted requests.
   setCacheBusting	Boolean	Optional		If operating behind a misbehaving proxy, allow the client to shuffle the subdomains.
   setSecure	Boolean	Optional	true	When true TLS is enabled.
   setConnectTimeout	Int	Optional	5	How long before the client gives up trying to connect with a subscribe call. The value is in seconds.
   setSubscribeTimeout	Int	Optional	310	The subscribe request timeout. The value is in seconds.
   setNonSubscribeRequestTimeout	Int	Optional	10	For non subscribe operations (publish, herenow, etc), how long to wait to connect to PubNub before giving up with a connection timeout error. The value is in seconds.
   setFilterExpression	String	Optional	Not set	Feature to subscribe with a custom filter expression.
   setHeartbeatNotificationOptions	PNHeartbeatNotificationOptions	Optional	PNHeartbeatNotificationOptions.FAILURES	Heartbeat notification options. By default, the SDK alerts on failed heartbeats (equivalent to PNHeartbeatNotificationOptions.FAILURES). Other options including all heartbeats (PNHeartbeatNotificationOptions.ALL) and no heartbeats (PNHeartbeatNotificationOptions.NONE) are supported.
   setOrigin	String	Optional		Custom origin if needed.
   setReconnectionPolicy	PNReconnectionPolicy	Optional	PNReconnectionPolicy.NONE	Set to PNReconnectionPolicy.LINEAR for automatic reconnects. Use PNReconnectionPolicy.NONE to disable automatic reconnects. Use PNReconnectionPolicy.EXPONENTIAL to set exponential retry interval.
   setPresenceTimeout	Int	Optional	300	Sets the custom presence server timeout. The value is in seconds, and the minimum value is 20 seconds.
   setPresenceTimeoutWithCustomInterval	Int, Int	Optional	300, 0	Parameters are presence timeout (same as setPresenceTimeout) and custom heartbeat interval at which to ping the server.
   setProxy	Proxy	Optional		Instructs the SDK to use a proxy configuration when communicating with PubNub servers. For more details see this https://docs.oracle.com/javase/7/docs/api/java/net/Proxy.html
   setMaximumReconnectionRetries	Int	Optional	-1	The config sets how many times to retry to reconnect before giving up.
   setProxySelector	ProxySelector	Optional		Sets Java ProxySelector. For more details, refer to https://docs.oracle.com/javase/7/docs/api/java/net/ProxySelector.html
   setProxyAuthenticator	Authenticator	Optional		Sets Java Authenticator. For more details refer to https://docs.oracle.com/javase/7/docs/api/java/net/Authenticator.html
   setGoogleAppEngineNetworking	Boolean	Optional		Enable Google App Engine networking.
   setSuppressLeaveEvents	Boolean	Optional	false	When true the SDK doesn't send out the leave requests.
   requestMessageCountThreshold	Int	Optional	100	PNRequestMessageCountExceededCategory is thrown when the number of messages into the payload is above requestMessageCountThreshold.
   setDisableTokenManager	Boolean	Optional	false	Disables the TMS (Token Manager System) in a way that it won't authorize requests even if there are applicable tokens.

Basic Usage

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

PNConfiguration pnConfiguration = new PNConfiguration();
// subscribeKey from Admin Portal
pnConfiguration.setSubscribeKey("SubscribeKey"); // required
// publishKey from Admin Portal (only required if publishing)
pnConfiguration.setPublishKey("PublishKey");
// secretKey (only required for access operations, keep away from Android)
pnConfiguration.setSecretKey("SecretKey");
// if cipherKey is passed, all communicatons to/from pubnub will be encrypted
pnConfiguration.setCipherKey("cipherKey");
// UUID to be used as a device identifier, a default UUID is generated
// if not passed
pnConfiguration.setUuid("myUniqueUUID");
// Enable Debugging
pnConfiguration.setLogVerbosity(PNLogVerbosity.BODY);
// if Access Manager is utilized, client will use this authKey in all restricted
// requests
pnConfiguration.setAuthKey("authKey");
// use SSL.
pnConfiguration.setSecure(true);
// PSV2 feature to subscribe with a custom filter expression
pnConfiguration.setFilterExpression("such=wow");
// heartbeat notifications, by default, the SDK will alert on failed heartbeats.
// other options such as all heartbeats or no heartbeats are supported.
pnConfiguration.setHeartbeatNotificationOptions(PNHeartbeatNotificationOptions.All);
pnConfiguration.setPresenceTimeout(120);
// the number of messages into the payload
pnConfiguration.setRequestMessageCountThreshold(100);

Initialization

Add PubNub to your project using one of the procedures defined under How to Get It

Description

This function is used for initializing the PubNub Client API context. This function must be called before attempting to utilize any API functionality in order to establish account level credentials such as publishKey and subscribeKey.

Method(s)

To Initialize PubNub you can use the following method(s) in the Java V4 SDK:

1. new PubNub(pnConfiguration);
   

   Parameter	Type	Required	Description
   pnConfiguration	PNConfiguration	Yes	Goto Configuration for more details.

Basic Usage

Initialize the PubNub client API:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.setSubscribeKey("my_subkey");
pnConfiguration.setPublishKey("my_pubkey");
pnConfiguration.setSecure(true);
pnConfiguration.setUuid("myUniqueUUID");
PubNub pubnub = new PubNub(pnConfiguration);

Returns

It returns the PubNub instance for invoking PubNub APIs like publish(), subscribe(), history(), hereNow(), etc.

Other Examples

1. Initialize a non-secure client:

   Note

   Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

   PNConfiguration pnConfiguration = new PNConfiguration();
   pnConfiguration.setSubscribeKey("SubscribeKey");
   pnConfiguration.setPublishKey("PublishKey");
   pnConfiguration.setSecure(false);
   pnConfiguration.setUuid("myUniqueUUID");
   PubNub pubnub = new PubNub(pnConfiguration);
   

2. Initialization for a Read-Only client:

   In the case where a client will only read messages and never publish to a channel, you can simply omit the publishKey when initializing the client:

   Note

   Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

   PNConfiguration pnConfiguration = new PNConfiguration();
   pnConfiguration.setSubscribeKey("my_subkey");
   PubNub pubnub = new PubNub(pnConfiguration);
   

3. Use a custom UUID

   Set a custom UUID to identify your users.

   Note

   Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

   PNConfiguration pnConfiguration = new PNConfiguration();
   pnConfiguration.setSubscribeKey("mySubscribeKey");
   pnConfiguration.setPublishKey("myPublishKey");
   pnConfiguration.setUuid("myUniqueUUID");
   PubNub pubnub = new PubNub(pnConfiguration);
   

4. Initializing with SSL Enabled:

   This examples demonstrates how to enable PubNub Transport Layer Encryption with SSL. Just initialize the client with setSecure set to true. The hard work is done, now the PubNub API takes care of the rest. Just subscribe and publish as usual and you are good to go.

   Note

   Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

   PNConfiguration pnConfiguration = new PNConfiguration();
   pnConfiguration.setSubscribeKey("my_subkey");
   pnConfiguration.setPublishKey("my_pubkey");
   pnConfiguration.setSecure(true);
   pnConfiguration.setUuid("myUniqueUUID");
   PubNub pubnub = new PubNub(pnConfiguration);
   

5. Initializing with Access Manager: Requires Access Manager add-onRequires that the Access Manager add-on is enabled for your key. See this page on enabling add-on features on your keys:
   https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

   Note

   Anyone with the secretKey can grant and revoke permissions to your app. Never let your secretKey be discovered, and to only exchange it / deliver it securely. Only use the secretKey on secure server-side platforms.

   When you init with secretKey, you get root permissions for the Access Manager. With this feature you don't have to grant access to your servers to access channel data. The servers get all access on all channels.

   For applications that will administer PAM permissions, the API is initialized with the secretKey as in the following example:

   Note

   Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

   PNConfiguration pnConfiguration = new PNConfiguration();
   pnConfiguration.setSubscribeKey("my_subkey");
   pnConfiguration.setPublishKey("my_pubkey");
   pnConfiguration.setSecretKey("my_secretkey");
   pnConfiguration.setUuid("myUniqueUUID");
   pnConfiguration.setSecure(true);
   
   PubNub pubnub = new PubNub(pnConfiguration);
   

   Now that the pubnub object is instantiated the client will be able to access the PAM functions. The pubnub object will use the secretKey to sign all PAM messages to the PubNub Network.

6. How to Set Proxy:

   Note

   Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

   PNConfiguration pnConfiguration = new PNConfiguration();
   pnConfiguration.setSubscribeKey("mySubscribeKey");
   pnConfiguration.setPublishKey("myPublishKey");
   pnConfiguration.setSecretKey("mySecretKey");
   pnConfiguration.setUuid("myUniqueUUID");
   Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("http://mydomain.com", 8080));
   pnConfiguration.setProxy(proxy);
   PubNub pubNub = new PubNub(pnConfiguration);
   

Event Listeners

Description

You can be notified of connectivity status, message and presence notifications via the listeners.

Listeners should be added before calling the method.

Adding Listeners

pubnub.addListener(new SubscribeCallback() {
    // PubNub status
    @Override
    public void status(PubNub pubnub, PNStatus status) {
        switch (status.getOperation()) {
            // combine unsubscribe and subscribe handling for ease of use
            case PNSubscribeOperation:
            case PNUnsubscribeOperation:
                // Note: subscribe statuses never have traditional errors,
                // just categories to represent different issues or successes
                // that occur as part of subscribe
                switch (status.getCategory()) {
                    case PNConnectedCategory:
                        // No error or issue whatsoever.
                    case PNReconnectedCategory:
                        // Subscribe temporarily failed but reconnected.
                        // There is no longer any issue.
                    case PNDisconnectedCategory:
                        // No error in unsubscribing from everything.
                    case PNUnexpectedDisconnectCategory:
                        // Usually an issue with the internet connection.
                        // This is an error: handle appropriately.
                    case PNAccessDeniedCategory:
                        // PAM does not allow this client to subscribe to this
                        // channel and channel group configuration. This is
                        // another explicit error.
                    default:
                        // You can directly specify more errors by creating
                        // explicit cases for other error categories of
                        // `PNStatusCategory` such as `PNTimeoutCategory` or
                        // `PNMalformedFilterExpressionCategory` or
                        // `PNDecryptionErrorCategory`.
                }

            case PNHeartbeatOperation:
                // Heartbeat operations can in fact have errors, so it's important to check first for an error.
                // For more information on how to configure heartbeat notifications through the status
                // PNObjectEventListener callback, refer to
                // /docs/sdks/java/android/api-reference/configuration#configuration_basic_usage
                if (status.isError()) {
                    // There was an error with the heartbeat operation, handle here
                } else {
                    // heartbeat operation was successful
                }
            default: {
                // Encountered unknown status type
            }
        }
    }

    // Messages
    @Override
    public void message(PubNub pubnub, PNMessageResult message) {
        String messagePublisher = message.getPublisher();
        System.out.println("Message publisher: " + messagePublisher);
        System.out.println("Message Payload: " + message.getMessage());
        System.out.println("Message Subscription: " + message.getSubscription());
        System.out.println("Message Channel: " + message.getChannel());
        System.out.println("Message timetoken: " + message.getTimetoken());
    }

    // Presence
    @Override
    public void presence(@NotNull PubNub pubnub, @NotNull PNPresenceEventResult presence) {
        System.out.println("Presence Event: " + presence.getEvent());
        // Can be join, leave, state-change or timeout

        System.out.println("Presence Channel: " + presence.getChannel());
        // The channel to which the message was published

        System.out.println("Presence Occupancy: " + presence.getOccupancy());
        // Number of users subscribed to the channel

        System.out.println("Presence State: " + presence.getState());
        // User state

        System.out.println("Presence UUID: " + presence.getUuid());
        // UUID to which this event is related

        presence.getJoin();
        // List of users that have joined the channel (if event is 'interval')

        presence.getLeave();
        // List of users that have left the channel (if event is 'interval')

        presence.getTimeout();
        // List of users that have timed-out off the channel (if event is 'interval')

        presence.getHereNowRefresh();
        // Indicates to the client that it should call 'hereNow()' to get the
        // complete list of users present in the channel.
    }

    // Signals
    @Override
    public void signal(PubNub pubnub, PNSignalResult pnSignalResult) {
        System.out.println("Signal publisher: " + signal.getPublisher());
        System.out.println("Signal payload: " + signal.getMessage());
        System.out.println("Signal subscription: " + signal.getSubscription());
        System.out.println("Signal channel: " + signal.getChannel());
        System.out.println("Signal timetoken: " + signal.getTimetoken());
    }

    // Message actions
    @Override
    public void messageAction(PubNub pubnub, PNMessageActionResult pnActionResult) {
        PNMessageAction pnMessageAction = pnActionResult.getAction();
        System.out.println("Message action type: " + pnMessageAction.getType());
        System.out.println("Message action value: " + pnMessageAction.getValue());
        System.out.println("Message action uuid: " + pnMessageAction.getUuid());
        System.out.println("Message action actionTimetoken: " + pnMessageAction.getActionTimetoken());
        System.out.println("Message action messageTimetoken: " + pnMessageAction.getMessageTimetoken());]
        System.out.println("Message action subscription: " + pnActionResult.getSubscription());
        System.out.println("Message action channel: " + pnActionResult.getChannel());
        System.out.println("Message action timetoken: " + pnActionResult.getTimetoken());
    }

    // files
    @Override
    public void file(PubNub pubnub, PNFileEventResult pnFileEventResult) {
        System.out.println("File channel: " + pnFileEventResult.getChannel());
        System.out.println("File publisher: " + pnFileEventResult.getPublisher());
        System.out.println("File message: " + pnFileEventResult.getMessage());
        System.out.println("File timetoken: " + pnFileEventResult.getTimetoken());
        System.out.println("File file.id: " + pnFileEventResult.getFile().getId());
        System.out.println("File file.name: " + pnFileEventResult.getFile().getName());
        System.out.println("File file.url: " + pnFileEventResult.getFile().getUrl());
    }
});

Removing Listeners

SubscribeCallback subscribeCallback = new SubscribeCallback() {
    @Override
    public void status(PubNub pubnub, PNStatus status) {

    }

    @Override
    public void message(PubNub pubnub, PNMessageResult message) {

    }

    @Override
    public void presence(PubNub pubnub, PNPresenceEventResult presence) {

    }

    @Override
    public void signal(PubNub pubnub, PNSignalResult pnSignalResult) {

    }

    @Override
    public void messageAction(PubNub pubnub, PNMessageActionResult pnActionResult) {

    }

    @Override
    public void user(PubNub pubnub, PNUserResult pnUserResult) {

    }

    @Override
    public void space(PubNub pubnub, PNSpaceResult pnSpaceResult) {

    }

    @Override
    public void membership(PubNub pubnub, PNMembershipResult pnMembershipResult) {

    }

    @Override
    public void file(PubNub pubnub, PNFileEventResult pnFileEventResult) {

    }

};

pubnub.addListener(subscribeCallback);

// some time later
pubnub.removeListener(subscribeCallback);

Handling Disconnects

SubscribeCallback subscribeCallback = new SubscribeCallback() {
    @Override
    public void status(PubNub pubnub, PNStatus status) {
        if (status.getCategory() == PNStatusCategory.PNUnexpectedDisconnectCategory) {
            // internet got lost, do some magic and call reconnect when ready
            pubnub.reconnect();
        } else if (status.getCategory() == PNStatusCategory.PNTimeoutCategory) {
            // do some magic and call reconnect when ready
            pubnub.reconnect();
        } else {
            log.error(status);
        }
    }

    @Override
    public void message(PubNub pubnub, PNMessageResult message) {

    }

    @Override
    public void presence(PubNub pubnub, PNPresenceEventResult presence) {

    }
};

pubnub.addListener(subscribeCallback);

Listener status events

Category	Description
PNNetworkUpCategory	The SDK detected that the network is online.
PNNetworkDownCategory	The SDK announces this when a connection isn't available, or when the SDK isn't able to reach the PubNub Data Stream Network.
PNNetworkIssuesCategory	A subscribe event experienced an exception when running. The SDK isn't able to reach the PubNub Data Stream Network. This may be due to many reasons, such as: the machine or device isn't connected to the internet; the internet connection has been lost; your internet service provider is having trouble; or, perhaps the SDK is behind a proxy.
PNReconnectedCategory	The SDK was able to reconnect to PubNub.
PNConnectedCategory	SDK subscribed with a new mix of channels. This is fired every time the channel or channel group mix changes.
PNAccessDeniedCategory	PAM permission failure.
PNMalformedResponseCategory	JSON parsing crashed.
PNBadRequestCategory	The server responded with a bad response error because the request is malformed.
PNDecryptionErrorCategory	If using decryption strategies and the decryption fails.
PNTimeoutCategory	Failure to establish a connection to PubNub due to a timeout.
PNRequestMessageCountExceedCategory	The SDK announces this error if requestMessageCountThreshold is set, and the number of messages received from PubNub (in-memory cache messages) exceeds the threshold.
PNUnknownCategory	Returned when the subscriber gets a non-200 HTTP response code from the server.

UUID

Description

These functions are used to set/get a user ID on the fly.

Method(s)

To set/get UUID you can use the following method(s) in Java V4 SDK:

1. pnConfiguration.setUuid(String);
   

   Parameter	Type	Required	Defaults	Description
   uuid	String	Yes	SDK generated uuid	UUID to be used as a device identifier, a default UUID is generated if not passed.

pnConfiguration.getUuid();

This method doesn't take any arguments.

Basic Usage

Set UUID:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.setUuid("myUniqueUUID");

Get UUID:

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.getUuid();

Authentication Key

Description

Setter and getter for users auth key.

Method(s)

1. pnConfiguration.setAuthKey(String);
   

   Parameter	Type	Required	Description
   Auth Key	String	Yes	If Access Manager is utilized, client will use this authKey in all restricted requests.

2. pnConfiguration.getAuthKey();
   

This method doesn't take any arguments.

Basic Usage

Set Auth Key

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.setAuthKey("authKey");

Get Auth Key

pnConfiguration.getAuthKey();

Returns

None.

Filter Expression

Requires Stream Controller add-onRequires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

Stream filtering allows a subscriber to apply a filter to only receive messages that satisfy the conditions of the filter. The message filter is set by the subscribing client(s) but it is applied on the server side thus preventing unwanted messages (those that do not meet the conditions of the filter) from reaching the subscriber.

To set/get filters you can use the following method. To learn more about filtering, refer to the Publish Messages documentation.

Method(s)

1. pnConfiguration.setFilterExpression(String);
   

   Parameter	Type	Required	Description
   filterExpression	String	Yes	PSV2 feature to subscribe with a custom filter expression

2. pnConfiguration.getFilterExpression();
   

This method doesn't take any arguments.

Basic Usage

Set Filter Expression

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.setFilterExpression("such=wow");

Get Filter Expression

pnConfiguration.getFilterExpression();