如何用Maven在不同JVM下顺序/并行运行Surefire单元测试并聚合报告？

Great question! Running unit tests across different JVMs is a common need for ensuring cross-compatibility, and Maven gives you flexible ways to handle this—plus options to aggregate results into a single report. Let’s break this down step by step:

1. Running Tests with a Specific JVM Individually #

Maven uses the JVM it’s launched with by default, but you can override this in two straightforward ways:

Option A: Temporarily Set JAVA_HOME #

Before executing Maven, point JAVA_HOME to your target JVM’s installation directory. This is the simplest approach for one-off runs.

Bash Example:

# For OpenJDK HotSpot
export JAVA_HOME=/opt/openjdk-hotspot
mvn clean test

# For Eclipse OpenJ9
export JAVA_HOME=/opt/openj9-jvm
mvn clean test

# For SAP JVM
export JAVA_HOME=/opt/sapjvm
mvn clean test

# For Azul Zulu
export JAVA_HOME=/opt/azul-zulu
mvn clean test

Windows Command Prompt Example:

set JAVA_HOME=C:\Program Files\OpenJDK\hotspot
mvn clean test

Option B: Use Maven Exec Plugin (No JAVA_HOME Change) #

If you don’t want to modify your environment variables, use the exec:exec goal to call the specific JVM’s java executable directly. Add this to your pom.xml:

<build>
  <plugins>
    <plugin>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>exec-maven-plugin</artifactId>
      <version>3.1.0</version>
      <executions>
        <execution>
          <id>run-tests-with-openj9</id>
          <goals><goal>exec</goal></goals>
          <phase>test</phase>
          <configuration>
            <!-- Replace with your JVM's java path -->
            <executable>/opt/openj9-jvm/bin/java</executable>
            <arguments>
              <argument>-cp</argument>
              <argument>${project.build.outputDirectory}:${project.build.testOutputDirectory}:${maven.test.classpath}</argument>
              <argument>org.junit.runner.JUnitCore</argument>
              <!-- Replace with your test class/package -->
              <argument>com.yourcompany.YourTestSuite</argument>
            </arguments>
          </configuration>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

Run it with: mvn exec:exec@run-tests-with-openj9

2. Running Tests Sequentially Across Multiple JVMs #

For repeatable sequential runs, use Maven profiles to encapsulate each JVM’s configuration. This keeps your setup clean and maintainable.

Add these profiles to your pom.xml:

<profiles>
  <profile>
    <id>hotspot</id>
    <properties>
      <jvm.path>/opt/openjdk-hotspot/bin/java</jvm.path>
      <report.dir>target/surefire-reports-hotspot</report.dir>
    </properties>
    <build>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>3.2.5</version>
          <configuration>
            <reportsDirectory>${report.dir}</reportsDirectory>
            <forkCount>1</forkCount>
            <jvm>${jvm.path}</jvm>
          </configuration>
        </plugin>
      </plugins>
    </build>
  </profile>
  
  <!-- Repeat for OpenJ9, SAP JVM, Azul -->
  <profile>
    <id>openj9</id>
    <properties>
      <jvm.path>/opt/openj9-jvm/bin/java</jvm.path>
      <report.dir>target/surefire-reports-openj9</report.dir>
    </properties>
    <build>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>3.2.5</version>
          <configuration>
            <reportsDirectory>${report.dir}</reportsDirectory>
            <forkCount>1</forkCount>
            <jvm>${jvm.path}</jvm>
          </configuration>
        </plugin>
      </plugins>
    </build>
  </profile>
</profiles>

Run all profiles sequentially with:

mvn clean test -P hotspot,openj9,sapjvm,azul

3. Running Tests in Parallel Across Multiple JVMs #

To speed things up, run tests across JVMs in parallel using a shell script that launches each Maven command in the background.

Bash Script Example (run-tests-parallel.sh):

#!/bin/bash

# Define JVM paths and labels
JVM_SETUPS=(
  "/opt/openjdk-hotspot:hotspot"
  "/opt/openj9-jvm:openj9"
  "/opt/sapjvm:sapjvm"
  "/opt/azul-zulu:azul"
)

# Launch each test run in the background
for setup in "${JVM_SETUPS[@]}"; do
  IFS=":" read -r java_home label <<< "$setup"
  export JAVA_HOME="$java_home"
  mvn clean test -Dsurefire.reportsDirectory=target/surefire-reports-$label &
done

# Wait for all background processes to finish
wait

echo "All parallel test runs completed successfully!"

Make it executable (chmod +x run-tests-parallel.sh) and run it.

4. Aggregating Test Results into a Single Report #

Use the Maven Surefire Report Plugin to combine results from all JVM runs into one HTML report. Add this to your pom.xml:

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-surefire-report-plugin</artifactId>
      <version>3.2.5</version>
      <configuration>
        <reportsDirectories>
          <reportsDirectory>target/surefire-reports-hotspot</reportsDirectory>
          <reportsDirectory>target/surefire-reports-openj9</reportsDirectory>
          <reportsDirectory>target/surefire-reports-sapjvm</reportsDirectory>
          <reportsDirectory>target/surefire-reports-azul</reportsDirectory>
        </reportsDirectories>
      </configuration>
    </plugin>
  </plugins>
</build>

Generate the aggregated report with:

mvn surefire-report:report

The final report will be at target/site/surefire-report.html, showing all test results grouped by JVM.

内容的提问来源于stack exchange，提问作者Mahatma_Fatal_Error