Method Name and Class Name are not covered? Why?

[Echo]

Hi, All. When i use jacoco to run the code, the report seems incorrect and makes me confused. 

1. About the class name line.

As you can see in the picture, the first line in HelloTest is red and the first line in the Hello isn't red. But both classes have been executed. 

2.About the method name line.

In Hello class, line 3 is green while line 9 doesn't have any color. Is it because line 3 is INIT Method. 

Regrads

Echo

[Marc Hoffmann]

Hi Echo,

Case 1: This is the implicit default constructor added by the Java compiler. As the HelloTest is probably never instantiated this line is red.

Case 2: I don't have an explanation here. What exact compiler version are you using (Eclipse)? Can you please provide the corresponding class file for further analysis?

Regards,
-marc

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[Echo]

Hi Marc

Case 1: "As the HelloTest is probably never instantiated this line is red". The line is red because HelloTest Class is never Instantiated. So why Hello Line doesn't have any color(red or green)? 

Case 2: All the constructor function is green or red. But the normal function line doesn't have any color. 

About the version: I use both eclipse(eclemma) and ant to check the phenomenon. The corresponding file are in the attachment.  

在 2017年11月24日星期五 UTC+8下午11:13:43，Marc R. Hoffmann写道：

[Evgeny Mandrikov]

Hi Echo,

Eclipse EclEmma plugin ( http://www.eclemma.org/ ) is based on JaCoCo library ( http://www.eclemma.org/jacoco/index.html ) that takes information about lines from bytecode. And bytecode is generated by a Java compiler.

Decompilation of your class files by command "javap -v -p" shows that "Hello.class" has following constructor and method and lines associated with them (output of command was trimmed to leave only relevant information):

  public Hello();

      LineNumberTable:
       line 3 
       line 4 
       line 5 
       line 6

  public void testGoto(int);

      LineNumberTable:

        line 10

        line 11

        line 12

        line 13

        line 15

and "HelloTest.class" has following constructor and method and lines associated with them:

  public HelloTest();

      LineNumberTable:

        line 1

  public static void main(java.lang.String[]);

      LineNumberTable:

        line 4

        line 5

From there you can see that compiler :

• did not saved in bytecode numbers of lines with method names and that's why they all are not highlighted
  
• line number of "public class HelloTest" has been saved as line of implicitly generated constructor, which is never called, and that's why it is highlighted as red
  
• there is no implicitly generated constructor in "public class Hello" and that's why this line is not highlighted
• line number of "public Hello(){" has been saved as line of explicit non-generated constructor, which is called, and that's why it is highlighted as green

All in all - there is no any "phenomenon", EclEmma shows lines that are saved in bytecode by compiler.

Regards,

Evgeny

[Echo]

Hi Evgeny

Thank you for your help! ! You are right!!!

Regards,

Echo

在 2017年11月28日星期二 UTC+8上午6:50:51，Evgeny Mandrikov写道：