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Depuração remota do projeto java maven no Raspberry Pi usando Eclipse IDE: erro de handshake

tag-icon • tag-icon java raspberrypi eclipse remote remote-access
Depuração remota do projeto java maven no Raspberry Pi usando Eclipse IDE: erro de handshake

Estou tentando configurar o Eclipse IDE (2021-09 (4.21.0)) no Ubuntu 20.04 para depurar remotamente aplicativos Java em um RaspberryPi. Eu segui vários 'tutoriais' (link1,link2). Com a combinação de ambos e a busca intensiva por mensagens de erro na web consegui recriar o pom.xml e o build.xml

pom.xml

<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org

/2001/XMLSchema-instance"
  xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>pi</groupId>
  <artifactId>hello</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>hello</name>
  <url>http://maven.apache.org</url>

<build>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
               <archive>
                  <manifest>
                     <mainClass>pi.hello.App</mainClass>
                  </manifest>
               </archive>
            </configuration>
         </plugin>
      </plugins>
   </build>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>6</maven.compiler.source>
    <maven.compiler.target>1.6</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

construir.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="hello" default="remote-run" basedir="."
    xmlns:artifact="antlib:org.apache.maven.artifact.ant">

    <!-- Setup RASPBERRY PI properties -->
    <property name="raspberrypi" value="192.168.4.2" />
    <property name="raspberryfolder" value="~" />
    <property name="username" value="pi" />
    <property name="password" value="raspberry" />

    <!--
    <path id="maven-ant-tasks.classpath" path="${ant.libs.dir}/maven-ant-tasks-2.1.3.jar" />
    <typedef 
        resource="org/apache/maven/artifact/ant/antlib.xml"
        uri="antlib:org.apache.maven.artifact.ant"
        classpathref="maven-ant-tasks.classpath" />

        
    <path id="maven-ant-tasks.classpath" path="lib/maven-ant-tasks-2.1.3.jar" />
    <typedef 
        resource="org/apache/maven/artifact/ant/antlib.xml" 
        uri="antlib:org.apache.maven.artifact.ant" 
        classpathref="maven-ant-tasks.classpath" />
    -->

    <!-- Add maven install target to be run before deploy -->
        
    <target name="maven-install"> 
        <artifact:mvn pom="pom.xml"> 
            <arg value="install"/> 
        </artifact:mvn> 
    </target> 

    <!-- Locate the prokect jar and transfer via scp to RASPBERRY PI -->
    <target name="transfer" depends="maven-install">
        <first id="jars">
            <!--
            <fileset dir="target" includes="**/*-SNAPSHOT-jar-with-dependencies.jar" />
            -->
            <fileset dir="target" includes="**/*.jar" />
        </first>
        <pathconvert pathsep="," property="jar.path" refid="jars" />
        <basename file="${jar.path}" property="jar.filename" />
        <echo>">>> Found application ${jar.path}"</echo>

        <echo>">>> Copying application to ${raspberrypi}:${raspberryfolder}/${jar.filename}"</echo>
        <scp 
            localfile="${jar.path}" 
            todir="${username}:${password}@${raspberrypi}:${raspberryfolder}" 
            trust="true" />

    </target>
        
    <!-- Run java -->
    <target name="remote-run" depends="transfer">   
        <echo>">>> Starting ${raspberrypi}:${raspberryfolder}/${jar.filename}"</echo>

        <sshexec 
            host="${raspberrypi}" 
            username="${username}" 
            password="${password}" 
            trust="true" 
            failonerror="true" 
            usepty="true" 
            command="java -jar ${jar.filename}" />
    </target>
    
    <!-- Run java in debug mode and keep waiting for execution -->
    <target name="remote-debug" depends="transfer"> 
        <echo>">>> Starting ${raspberrypi}:${raspberryfolder}/${jar.filename} in debug mode"</echo>
        <sshexec 
            host="${raspberrypi}" 
            username="${username}" 
            password="${password}" 
            trust="true" 
            failonerror="true" 
            usepty="true" 
            command="java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=8000,suspend=y -jar ${jar.filename}" />
    </target>
</project>

A saída quando o build.xml é compilado usando

Executar como -> Construção Ant

resulta em

maven-install:
[artifact:mvn] [INFO] Scanning for projects...
[artifact:mvn] [INFO] ------------------------------------------------------------------------
[artifact:mvn] [INFO] Building hello
[artifact:mvn] [INFO]    task-segment: [install]
[artifact:mvn] [INFO] ------------------------------------------------------------------------
[artifact:mvn] [INFO] [resources:resources]
[artifact:mvn] [INFO] Using 'UTF-8' encoding to copy filtered resources.
[artifact:mvn] [INFO] skip non existing resourceDirectory /media/stefan/DATA/Electronics/java/hello/src/main/resources
[artifact:mvn] [INFO] [compiler:compile]
[artifact:mvn] [INFO] Nothing to compile - all classes are up to date
[artifact:mvn] [INFO] [resources:testResources]
[artifact:mvn] [INFO] Using 'UTF-8' encoding to copy filtered resources.
[artifact:mvn] [INFO] skip non existing resourceDirectory /media/stefan/DATA/Electronics/java/hello/src/test/resources
[artifact:mvn] [INFO] [compiler:testCompile]
[artifact:mvn] [INFO] Nothing to compile - all classes are up to date
[artifact:mvn] [INFO] [surefire:test]
[artifact:mvn] [INFO] Surefire report directory: /media/stefan/DATA/Electronics/java/hello/target/surefire-reports
[artifact:mvn] -------------------------------------------------------
[artifact:mvn]  T E S T S
[artifact:mvn] -------------------------------------------------------
[artifact:mvn] Running pi.hello.AppTest
[artifact:mvn] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.021 sec
[artifact:mvn] Results :
[artifact:mvn] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
[artifact:mvn] [INFO] [jar:jar]
[artifact:mvn] [INFO] [install:install]
[artifact:mvn] [INFO] Installing /media/stefan/DATA/Electronics/java/hello/target/hello-0.0.1-SNAPSHOT.jar to /home/stefan/.m2/repository/pi/hello/0.0.1-SNAPSHOT/hello-0.0.1-SNAPSHOT.jar
[artifact:mvn] [INFO] ------------------------------------------------------------------------
[artifact:mvn] [INFO] BUILD SUCCESSFUL
[artifact:mvn] [INFO] ------------------------------------------------------------------------
[artifact:mvn] [INFO] Total time: 1 second
[artifact:mvn] [INFO] Finished at: Tue Nov 30 17:12:36 CET 2021
[artifact:mvn] [INFO] Final Memory: 18M/70M
[artifact:mvn] [INFO] ------------------------------------------------------------------------
transfer:
     [echo] ">>> Found application /media/stefan/DATA/Electronics/java/hello/target/hello-0.0.1-SNAPSHOT.jar"
     [echo] ">>> Copying application to 192.168.4.2:~/hello-0.0.1-SNAPSHOT.jar"
      [scp] Connecting to 192.168.4.2:22
      [scp] done.
remote-run:
     [echo] ">>> Starting 192.168.4.2:~/hello-0.0.1-SNAPSHOT.jar"
  [sshexec] Connecting to 192.168.4.2:22
  [sshexec] cmd : java -jar hello-0.0.1-SNAPSHOT.jar
  [sshexec] Hello World!
  [sshexec] 
BUILD SUCCESSFUL
Total time: 6 seconds

Todas as outras combinações de plug-ins ou artefatos para o build.xml padrão do projeto maven (criado via assistente) produziram erros devido a versões erradas em alguns plug-ins (mesmo que a versão correta esteja instalada

Erro ao resolver a versão de 'org.apache.maven.plugins:maven-resources-plugin': o plug-in requer o Maven versão 3.0

Versão Atual

mvn -version
Apache Maven 3.6.3
Maven home: /usr/share/maven
Java version: 11.0.11, vendor: Ubuntu, runtime: /usr/lib/jvm/java-11-openjdk-amd64
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.11.0-40-generic", arch: "amd64", family: "unix"

Para começar a trabalhar, prefiro não alterar meu build.xml atual.

Para a última etapa da configuração, preciso fazer o inicializador remoto funcionar. Seguindo os tutoriais, a janela de configuração se parece com debug_config

Testar a conexão resulta em

erro_vm

Como o processo de construção conseguiu conectar via ssh, colocar e executar o jar, não sei por que a conexão não pode ser estabelecida. Os parâmetros para a conexão são armazenados em pom.xml. Não tenho certeza do que as entradas na configuração de depuração fazem. Um terminal no RPi pode ser estabelecido usando os comandos de linha de comando para a conexão ssh (ssh pi@). Não deve haver um problema de acesso de segurança.

  1. Por que a configuração remota precisa do endereço, porta quando a conexão já está definida no pom.xml?
  2. O build.xml é chamado usando 'Debug_As->RPi_Remote' (a configuração de depuração criada)?
  3. Como posso chamar o build.xml e habilitar o uso de pontos de interrupção?

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