How to debug a function in different Java versions and runtimes?

In different Java versions: Before Java 8 use printing variable values, breakpoints and stacktrace. Java 8 and above use JMC remote debugging and assertion statements. In different runtimes: Oracle Java uses java -agentlib to start the JVM and uses jdb for debugging. OpenJDK uses JMC remote debugging or jdb and jstack for command line debugging.

How to debug functions in different Java versions and runtimes

Introduction
Debugging Functions are a crucial step in the software development process, helping to identify and solve problems in your code. However, there may be differences in how functions are debugged in different Java versions and runtimes. This article explains how to effectively debug functions across different Java versions and runtimes, and provides practical examples to deepen understanding.

Debugging Tools
In Java, debugging functions can be done through an integrated development environment (IDE) or command line tools. Common IDEs include Eclipse and IntelliJ IDEA, while command line tools include jdb and jstack.

Debugging of different Java versions

Before Java 8

• Use System.out.println () Print variable values ​​for debugging.
• Use breakpoints and single-step execution functions for code tracing.
• Use stacktrace to print the call stack.

Java 8 and later

• Use Java Mission Control (JMC) for remote debugging.
• Add assertion statements to the code for debugging.
• Use Java VisualVM for memory and thread debugging.

Debugging at different runtimes

Oracle Java

• Use java -agentlib :jdwp=transport=dt_socket,server=y,suspend=y Start JVM.
• Connect jdb and debug using breakpoints and single-step functionality.

OpenJDK

• Use JMC for remote debugging.
• Use jdb for command line debugging.
• Use jstack to print the thread stack.

Practical case

Consider a simple Java function:

public int sum(int a, int b) {
    return a + b;
}

Debugging example:

• Debugging in Eclipse: Set breakpoints and use the single-step function to track code execution.
• Use jdb debugging in the command line: Use the run command to start the program, and then use the step and next commands Step through code.
• Use JMC for remote debugging: Attach JMC to a running JVM and debug using breakpoints and call stacks.

With these examples, you can learn how to effectively debug functions in different Java versions and runtimes.

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