Jacoco :Dump Connection refused error

[Aman Singh Tomar]

Hi Developers,

Can you please assist me on the below Jacoco maven plugin issue;

I am getting connection refused error during jacoco:dump goal.

Below is my pom file :

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.1.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>jacoco</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>jacoco</name>
<description>jacoco</description>
<properties>
<java.version>17</java.version>
<jacoco.agent.argLine>-javaagent:/Users/tomara/.m2/repository/org/jacoco/org.jacoco.agent/0.8.10/org.jacoco.agent-0.8.10-runtime.jar=destfile=/Users/tomara/Documents/git/jacoco/target/jacoco.exec</jacoco.agent.argLine>
<jacoco.propertyName>coverageAgent</jacoco.propertyName>
<jacoco.destFile>${project.build.directory}/coverage.exec</jacoco.destFile>
<jacoco.append>false</jacoco.append>
<!-- <jacoco.exclClassLoaders>sun.reflect.DelegatingClassLoader:MyClassLoader</jacoco.exclClassLoaders>-->
<!-- <jacoco.inclBootstrapClasses>true</jacoco.inclBootstrapClasses>-->
<!-- <jacoco.inclNoLocationClasses>true</jacoco.inclNoLocationClasses>-->
<!-- <jacoco.sessionId>session</jacoco.sessionId>-->
<jacoco.dumpOnExit>true</jacoco.dumpOnExit>
<jacoco.output>file</jacoco.output>
<jacoco.address>localhost</jacoco.address>
<jacoco.port>36320</jacoco.port>
<jacoco.classDumpDir>${project.build.directory}/classdumps</jacoco.classDumpDir>
<!-- <jacoco.jmx>true</jacoco.jmx>-->

<jacoco.dataFile>${jacoco.destFile}</jacoco.dataFile>


</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm</artifactId>
<version>9.5</version>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm-commons</artifactId>
<version>9.5</version>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm-tree</artifactId>
<version>9.5</version>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm-analysis</artifactId>
<version>9.5</version>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm-util</artifactId>
<version>9.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jacoco/org.jacoco.cli -->
<dependency>
<groupId>org.jacoco</groupId>
<artifactId>org.jacoco.cli</artifactId>
<version>0.8.10</version>
</dependency>

</dependencies>

<build>
<plugins>
<!-- Configure Surefire plugin for unit tests -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0</version> <!-- Use a version compatible with JaCoCo 0.8.10 -->
<configuration>
<argLine> ${coverageAgent}</argLine>
</configuration>
</plugin>

<!-- Configure Failsafe plugin for integration tests -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>3.0.0</version> <!-- Use a version compatible with JaCoCo 0.8.10 -->
<configuration>
<argLine> ${coverageAgent}</argLine>
</configuration>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.8</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
<goal>dump</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>




</project>

 And Below is the maven error :-

 --- jacoco-maven-plugin:0.8.8:dump (default) @ jacoco ---
[DEBUG] Loading mojo org.jacoco:jacoco-maven-plugin:0.8.8:dump from plugin realm ClassRealm[plugin>org.jacoco:jacoco-maven-plugin:0.8.8, parent: jdk.internal.loader.ClassLoaders$AppClassLoader@531d72ca]
[DEBUG] Configuring mojo execution 'org.jacoco:jacoco-maven-plugin:0.8.8:dump:default' with basic configurator -->
[DEBUG]   (f) address = localhost
[DEBUG]   (f) append = false
[DEBUG]   (f) destFile = /Users/tomara/Documents/git/jacoco/target/coverage.exec
[DEBUG]   (f) dump = true
[DEBUG]   (f) port = 36320
[DEBUG]   (f) project = MavenProject: com.example:jacoco:0.0.1-SNAPSHOT @ /Users/tomara/Documents/git/jacoco/pom.xml
[DEBUG]   (f) reset = false
[DEBUG]   (f) retryCount = 10
[DEBUG]   (f) skip = false
[DEBUG] -- end configuration --
[INFO] Connecting to localhost/127.0.0.1:36320
[INFO] Connection refused
[INFO] Connecting to localhost/127.0.0.1:36320
[INFO] Connection refused
[INFO] Connecting to localhost/127.0.0.1:36320
[INFO] Connection refused
[INFO] Connecting to localhost/127.0.0.1:36320
[INFO] Connection refused
[INFO] Connecting to localhost/127.0.0.1:36320
[INFO] Connection refused

Please help mates.... Not able to understand why this is happening

[Marc Hoffmann]

Hi,

this simply means there is no JaCoCo agent running on localhost port 36320 at the point in time when you try to generate the dump.

With linux tools like netstat -a you can get a list of all ports which are currently bound.

Regards,

-marc

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[Aman Singh Tomar]

Hi,

Thanks for replying...

Can you please help me to identify why this jacoco agent is not running ?

Am I missing something in configuration of jacoco ? or Do I need to attach it to some lifecycle phase ?

Or what exactly do I need to do in order to make it work ?

I am been struggling many weeks to figure out this.

Thanks in advance.

[Aman Singh Tomar]

Hi Marc, 

Can you please suggest what shall I do to make it work ?

[Marc Hoffmann]

Hi Aman,

why do you think you need the dump goal? It is for advanced use cases only..

JaCoCo documentation comes with a basic, working example. I would recommend to start from there: https://www.jacoco.org/jacoco/trunk/doc/

Regards,

-marc

To view this discussion on the web visit https://groups.google.com/d/msgid/jacoco/4ece8884-6321-455b-870a-60597e681753n%40googlegroups.com.

[Aman Singh Tomar]

Hi Marc,

So we are using this dump goal in CI. 

So earlier we were working on jdk 8 but when we migrated to jdk 17, this goal started failing.

so I am been struggling to find the root cause and to fix this .

Not sure what exactly is breaking it.

Thanks & Regards

[Marc Hoffmann]

Hi Aman,

in this case you have to analyse the process under test. I would start with the following questions:

1) What exactly is the command line? Is the JaCoCo agent properly configured here?

2) Are there any log messages on stderr when the process starts?

3) Is the process under test still running when you execute the dump goal?

Regards,

-marc

To view this discussion on the web visit https://groups.google.com/d/msgid/jacoco/89c48d5f-57be-463f-b4c0-696beb163db3n%40googlegroups.com.

[Aman Singh Tomar]

Hi Marc,

Answering to your questions below :

1. What exactly is the command line? Is the JaCoCo agent properly configured here? -> In the command line agent is getting set but it is not coming up. 

2. Are there any log messages on stderr when the process starts? - No logs or anything related to it.

3. Is the process under test still running when you execute the dump goal? - No process is running during dump goal.

Not sure what exactly is happening or am  I missing.

I just wanted to create a simple maven project which will execute single JUnit classes and it is produce jacoco.exec and also execute jacoco:dump goal.

Maybe you have some working project then I will look into that too.

Thanks and Regards

[Marc Hoffmann]

Hi Aman,

3. Is the process under test still running when you execute the dump goal? - No process is running during dump goal.

In this case the dump goal will not be able to connect. The dump tool is for advanced use cases only where the application under test is e.g. a long running server process.

I just wanted to create a simple maven project which will execute single JUnit classes and it is produce jacoco.exec and also execute jacoco:dump goal.

Then why do you want to use the dump goal? The standard behaviour of the JaCoCo agent is to write execution data to disc when the test JVM terminates.

Please see documentation which also includes such a simple example.

Regards,

-marc

To view this discussion on the web visit https://groups.google.com/d/msgid/jacoco/4f4313eb-dc5e-475d-95bb-729524f6999cn%40googlegroups.com.

[Aman Singh Tomar]

Hi Marc,

Can we have a short call to discuss this issue in much detail ? 

It would be very helpful if we could connect and discuss this..

I am ok with your time.

Thanks

[Marc Hoffmann]

Unfortunately we cannot provide private support.

As said before please read our documentation and start with the simple, working examples which we provide.

Regards,

-marc

To view this discussion on the web visit https://groups.google.com/d/msgid/jacoco/7fe98a6f-2755-48f9-895d-c0b9185531a6n%40googlegroups.com.