检查Java字节码是否包含调试符号

Question

I would like to know how can I check if a compiled Java class contains debug symbols. The problem is that I compile an application from ant with debug="on", but a specific JVM throws an exception: it says that the debug symbols are missing.

Thanks.

Answer 1

If you run javap -v on the class file, you will see the debug information that is present in the file.

It is worth compiling a simple test class with different -g option settings and looking at the results with javap .

^{If, you need to know exactly how javap presents the information, it is it is best for you to try it out in your Java installation. The output from the javap command may vary between different Java versions.}

Answer 2

具有调试信息的类文件最重要的是LineNumberTable，它将字节码指令映射到源行号和LocalVariableTable，它告诉调试器您的本地变量，包括方法的参数在执行期间驻留在VM中。