About jmh running error: transport error 202: Connect failed: connection reused error solution

ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:750]
<forked VM failed with exit code 2>
<stdout last='20 lines'>
</stdout>
<stderr last='20 lines'>
ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:750]

solution: run it by command instead of directly running the
MVN clean package
java-jar target/benchmarks. Jar

if the Maven project generation jar runtime prompts “no main listing properties”, the entry class (that is, the class in which the main function resides)

cannot be found

modify the po. XML file by adding the following configuration item to specify the entry class: 

<build>
  <plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>1.2.1</version>
        <executions>
            <execution>
                <phase>package</phase>
                <goals>
                        <goal>shade</goal>
                </goals>
                    <configuration>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>com.jesper.jmh.FirstBenchmark</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
            </execution>
        </executions>
     </plugin>
  </plugins>
</build>

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