JVM, byte codes & jvm languages
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The document discusses the Java Virtual Machine (JVM) and its key properties including being architecture neutral, using bytecode, and being interpreted and dynamically typed. It also covers JVM implementations, bytecode manipulation through various APIs, and how new languages and domain-specific languages can be implemented to run on the JVM.
JVM, byte codes & jvm languages
- 1. JVM, Byte Codes & Languages
- 2. Agenda The Java Virtual Machine Architecture neutral Interpreted and Dynamic Secure Multithreading Implementations Byte Code Manipulation New Language and DSL
- 3. JVM: Architecture Neutral Byte codes Portable Robust
- 4. JVM : Interpreted and Dynamic Dynamic Loading and Binding The Fragile Superclass Problem Solving the Fragile Superclass Problem Run-time Representations
- 5. JVM : Secure Memory Allocation and Layout Security Checks in the Class Loader The Byte Code Verification Process Bootstrap + Extension System Java Application Bootstrap + Extension System Tomcat Application Common/Shared Web App A Web App B
- 6. JVM : Multithreading Threads at the Java Language Level Integrated Thread Synchronization
- 7. JVM : Implementations Java Virtual Machine Reference Implementation (Oracle) Open SDK (Oracle) JRockit (Oracle) Apache Harmony (Apache) IBM JVM (IBM) Zing (Azul System) The Da Vinci Machine (Java 7/8, Oracle)
- 8. Byte Code Manipulation Low Level API ASM (ObjectWeb) Javassist (JBoss) BCEL (Apache) High Level API CGLib The Compiler API (Java 6) AOP: Aspect J, java.lang.reflect.Proxy
- 9. Byte Code Manipulation: Hooks ClassLoader java.lang.instrument: Java Agent, premain method, ClassFileTransformer.
- 10. New Language and DSL New Languages Clojure, Groovy, Scala, JRuby, Jython, Rhino, Ceylon, Kotlin Domain-Specific Language HQL, JPQL Drools Custom
- 11. New Language and DSL: Implementation Write a parser/compiler/interpreter with: ANTLR, JavaCC, xText, Parboiled Write a AST (Abstract Syntax Tree) for: Analysis and error reporting Transform the AST to one target platform (SQL, Java Source Code, Byte Code).
- 12. Questions?