Static analysis tools analyze your bytecode to determine the code complexity.Īnother common use is class generation. Some software shops have code-complexity rules such as a maximum number of if/else statements in a method or a maximum method size. For example, the popular FindBugs bug-locator tool uses ASM under the hood to analyze your bytecode and locate bug patterns. One important use case is program analysis. You can use bytecode manipulation to perform many tasks that would be difficult or impossible to do otherwise, and once you learn it, the sky's the limit. For that reason, and because it’s really quite fun, you might find bytecode manipulation a valuable skillset to have. Many common Java libraries such as Spring and Hibernate, as well as most JVM languages and even your IDEs, use bytecode-manipulation frameworks. Why should you care about manipulating bytecode? This article focuses on Javassist and ASM.
Some of the more popular frameworks for manipulating bytecode include:
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In this article we will investigate Java bytecode and how to manipulate it, and why anyone would ever want to do so. class file contains the bytecode, essentially the instruction set for the Java virtual machine (JVM), and is what gets loaded by the Java runtime class loader when a program executes. javac -verbose src/com/example/spring2gx/BankTransactions.java If you run the build from the command line with verbose enabled, you can see the output as it parses your file until finally it prints your. java file into a Java compiler, (likely using javac or a build tool like ANT, Maven or Gradle), the compiler grinds away, and finally emits one or more. You are probably all too familiar with the following sequence: You input a.
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