如何使用 Maven 类路径运行 Java 主 class？

Question

I'm currently using Maven to build my Rhino JavaScript project, download dependent libraries, and manage the classpath at runtime. I'm able to run the JavaScript entry point by using the Maven exec plugin, in the following way:

        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.1</version>
            <executions>
                <execution>
                    <goals>
                        <goal>java</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <mainClass>org.mozilla.javascript.tools.shell.Main</mainClass>
                <classpathScope>runtime</classpathScope>
                <arguments>
                    <argument>path/to/entryPoint.js</argument>
                </arguments>
            </configuration>
        </plugin>

This works well, but the problem is that maven takes about 10 seconds just to start, which is about 10 times longer than it takes my program to run. Is there a way to either:

1. improve the performance of the maven exec plugin so that it takes less time to start, or
2. export the classpath that maven would use at runtime, so that I can just start my program from a script?

Answer 1

1. You can use the -o / --offline switch to tell Maven to not bother checking for snapshot or plugin updates.

2. Use the appassembler or assembly plugins to generate startup scripts which will automatically (in the case of appassembler) reference the desired classpath.