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# Sessions & Transactions
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Client session management for multi-document ACID transactions and causally consistent read operations with automatic retry logic.
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## Capabilities
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### ClientSession Interface
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```java { .api }
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public interface ClientSession extends Closeable {
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    ServerSession getServerSession();
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    BsonTimestamp getOperationTime();
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    BsonDocument getClusterTime();
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    void startTransaction();
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    void startTransaction(TransactionOptions transactionOptions);
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    void commitTransaction();
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    void abortTransaction();
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    <T> T withTransaction(TransactionBody<T> transactionBody);
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    <T> T withTransaction(TransactionBody<T> transactionBody, TransactionOptions options);
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    boolean hasActiveTransaction();
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    boolean notifyMessageSent();
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    void close();
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}
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@FunctionalInterface
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public interface TransactionBody<T> {
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    T execute() throws Exception;
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}
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```
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*[Full sessions and transactions documentation would follow...]*