Chapter 10: Interoperability with Java

In this section

• 10.1 Calling Java Methods from Clojure
  • 10.1.1 Java Interop Syntax
    Master the syntax for calling Java methods from Clojure in Chapter 10: Interoperability with Java.
  • 10.1.2 Accessing Fields and Properties
    Explore how to access Java fields and properties directly from Clojure using Java interop techniques.
  • 10.1.3 Constructors and Object Creation
    Learn how to create Java objects in Clojure using constructors and the 'new' keyword, with examples of passing arguments and using different constructors.
• 10.2 Creating Java Objects in Clojure
  • 10.2.1 Implementing Interfaces with `proxy`
    Master the use of the `proxy` macro in Clojure for creating anonymous classes that implement interfaces or extend classes, with syntax explanations and method overriding techniques.
  • 10.2.2 Using `reify` for Interface Implementations
    Explore how to utilize Clojure's `reify` to implement interfaces concisely, enhancing interoperability with Java.
  • 10.2.3 Extending Classes
    Discover how to extend Java classes in Clojure using gen-class and compile them for Java compatibility.
• 10.3 Implementing Interfaces and Extending Classes
  • 10.3.1 Defining Classes with `gen-class`
    Learn how to define Clojure classes using `gen-class`, specify methods, and handle constructors for seamless Java interoperability.
  • 10.3.2 Overriding Methods
    Learn how to override methods effectively when extending classes or implementing interfaces in Clojure. Includes method definitions and handling method signatures.
  • 10.3.3 Compiling and Using Generated Classes
    Learn how to compile Clojure code using `gen-class` into Java bytecode and integrate it into Java applications.
• 10.4 Handling Java Exceptions
  • 10.4.1 Catching Exceptions from Java Code
    Learn how to catch Java exceptions in Clojure using the try, catch, and finally constructs, with examples on handling specific exceptions and cleanup actions.
  • 10.4.2 Throwing Exceptions in Clojure
    Explore how to throw exceptions from Clojure using the throw function. Learn about exception propagation and handling when integrating with Java code.
  • 10.4.3 Exception Translation Strategies
    Explore strategies for translating exceptions between Clojure and Java, including creating custom exceptions and wrapping Java exceptions in Clojure exceptions.
• 10.5 Accessing Java Libraries
  • 10.5.1 Using Java Standard Libraries
    Learn how to leverage Java standard libraries in Clojure for collections, I/O, networking, and concurrency.
  • 10.5.2 Adding External Java Libraries
    Learn how to include and leverage external Java libraries in your Clojure projects using dependency management with project.clj or deps.edn, and explore examples from popular Java libraries.
  • 10.5.3 Handling Method Overloading
    Explore how Clojure deals with overloaded methods in Java, leveraging type hints for clarity and performance.
• 10.6 Integrating Clojure Code in Java Applications
  • 10.6.1 Compiling Clojure Code for Java Use
    Learn how to compile Clojure code into Java bytecode using AOT compilation, and package it into JAR files for Java integration.
  • 10.6.2 Invoking Clojure Functions from Java
    Learn to seamlessly invoke Clojure functions within Java applications using compiled classes or dynamic invocation via the Clojure Java API.
  • 10.6.3 Managing Classpaths and Dependencies
    Learn how to efficiently manage classpaths and dependencies while integrating Clojure with Java applications, ensuring seamless interoperation across libraries and components.
• 10.7 Data Type Conversion Between Java and Clojure
  • 10.7.1 Primitive Types and Wrappers
    Explore how Clojure manages Java primitive types and their wrappers with boxing and unboxing techniques for seamless type usage.
  • 10.7.2 Working with Java Collections
    Explore data type conversion between Java and Clojure collections, featuring essential utility functions and methods for seamless interoperability.
  • Handling Arrays
    Master working with Java arrays in Clojure, including creation, access, and modification using functions like `make-array`, `to-array`, and `aget`.
  • 10.7.4 Dealing with `null` Values
    Learn how Clojure represents Java's `null` as `nil`, potential pitfalls, and strategies for safely handling `nil` in your Clojure code.
• 10.8 Performance Considerations in Interop
  • 10.8.3 Benchmarks and Profiling
    Learn to effectively use tools for profiling Clojure applications interacting with Java. Discover techniques to identify bottlenecks and optimize critical sections in your hybrid codebase.
  • 10.8.1 Reflection and Performance Overheads
    Understanding the performance impact of reflection in Clojure when calling Java methods and how to mitigate it using type hints.
  • 10.8.2 Type Hinting and Avoiding Reflection
    Optimize Clojure-Java interop performance with type hints, minimizing reflection overhead for efficient execution.
• 10.9 Case Studies and Examples
  • 10.9.1 Integrating Clojure into a Java Application
    Explore a case study on integrating Clojure into a Java application, covering motivation, process, and challenges.
  • 10.9.2 Using Java Libraries in a Clojure Project
    Explore how to harness the power of Java libraries within a Clojure application to enhance functionality and performance.
  • 10.9.3 Building Hybrid Systems
    Explore the development of hybrid systems using both Java and Clojure, emphasizing the benefits and considerations of this approach.
• 10.10 Best Practices for Interoperability
  • 10.10.3 Testing Interoperable Code
    Explore effective strategies for testing code that bridges Clojure and Java components. Learn to implement unit tests, integration tests, and utilize test doubles to ensure reliability in hybrid applications.
  • 10.10.1 Code Organization
    Learn best practices for organizing code when integrating Clojure with Java, focusing on separation of concerns, clear module boundaries, and consistent naming conventions.
  • 10.10.2 Exception Handling Across Languages
    Discover guidelines for consistent exception handling across Java and Clojure to ensure seamless language interoperability without leaking implementation details.
  • 10.10.4 Maintaining Interoperable Systems
    Explore effective techniques for maintaining systems with both Clojure and Java code, focusing on dependency management, documentation, and team collaboration.