如何在 Eclipse 中调试时将 Java 对象的当前值打印到控制台，而不是挂起线程？

Question

Sometimes you need just to check how are some values in your application changing in time. Usually, you can use the log, but imagine that your application is on severs already and make the whole CI/CD cycle, just to add a few temporary log statements is overkill. Or variables are in 3-rd party libraries, and you don't want to patch it.

Of course, you can (remotely) debug your application, but it may be an issue to suspend the thread and check several variables again and again and again.

Such functionality is available in the JetBrains IntelliJ IDEA out of the box - tracepoint, but what about Eclipse?

Answer 1

Fortunately, you can implement the "virtual logging" with Eclipse.

To do it:

1. Start the debug session
2. add the conditional breakpoint to the line that you want to add a log statement
3. Write the log statement to the breakpoint condition and return false;

That's all. The application will not suspend while passing breakpoint but will write to output the value of the variable