——precompile标志应该做什么?

Question

我使用Spoon在带注释的类上生成代码，这样我就可以减少我正在工作的项目中的样板和代码重复。

由于项目非常小，我正在寻找方法，所以我不必将整个事情分成两个甚至三个不同的项目，必须按顺序编译所以我的AnnotationProcessor在

中可用

查看Spoon文档，我发现了--precompile标志，据我所知，它应该预编译整个源代码并将其添加到类路径中，因此Spoon将在运行时找到处理器和其他东西。

但是根据我在运行它时得到的错误，它似乎不起作用，即使我已经添加了该选项，我仍然缺少处理器。

---

[INFO] --- exec-maven-plugin:1.5.0:java (execute-spoon) @ JHTML5 ---
12:29:50.454 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - output: spooned
12:29:50.456 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - destination: C:DataCrumbleWorks_javaJHTML5spooned-classes
12:29:50.457 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - source classpath: null
12:29:50.457 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - template classpath: []
12:29:50.466 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - output: spooned
12:29:50.466 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - destination: C:DataCrumbleWorks_javaJHTML5spooned-classes
12:29:50.466 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - source classpath: null
12:29:50.467 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - template classpath: []
12:29:50.467 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - compiling sources: []
12:29:50.539 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - compile args: [-encoding, UTF-8, -cp, .;/C:/Data/CrumbleWorks_java/JHTML5/target/classes;/C:/Data/Maven/repo/fr/inria/gforge/spoon/spoon-core/5.4.0/spoon-core-5.4.0.jar;/C:/Data/Maven/repo/org/eclipse/jdt/org.eclipse.jdt.core/3.12.0.v20160516-2131/org.eclipse.jdt.core-3.12.0.v20160516-2131.jar;/C:/Data/Maven/repo/com/martiansoftware/jsap/2.1/jsap-2.1.jar;/C:/Data/Maven/repo/commons-io/commons-io/1.4/commons-io-1.4.jar;/C:/Data/Maven/repo/org/slf4j/log4j-over-slf4j/1.7.21/log4j-over-slf4j-1.7.21.jar;/C:/Data/Maven/repo/ch/qos/logback/logback-classic/1.1.7/logback-classic-1.1.7.jar;/C:/Data/Maven/repo/ch/qos/logback/logback-core/1.1.7/logback-core-1.1.7.jar;/C:/Data/Maven/repo/org/crumbleworks/forge/crumbutil/crumbutil/0.1.0/crumbutil-0.1.0.jar;/C:/Data/Maven/repo/org/slf4j/slf4j-api/1.7.21/slf4j-api-1.7.21.jar, -d, C:DataCrumbleWorks_javaJHTML5spooned-classes, -1.8, -proc:none, -preserveAllLocals, -noExit, -enableJavadoc, .]
12:29:50.790 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - compiled in 323 ms
12:29:50.792 [spoon.Launcher.main()] INFO spoon.support.StandardEnvironment - Spoon version 5.4.0
12:29:50.792 [spoon.Launcher.main()] INFO spoon.support.StandardEnvironment - running Spoon...
12:29:50.792 [spoon.Launcher.main()] INFO spoon.support.StandardEnvironment - start processing...
12:29:50.792 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - building sources: []
12:29:50.792 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - built in 0 ms
12:29:50.792 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - building templates: []
12:29:50.792 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - built in 0 ms
12:29:50.793 [spoon.Launcher.main()] DEBUG spoon.support.StandardEnvironment - model built in 1
[WARNING]
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:294)
        at java.lang.Thread.run(Thread.java:745)
Caused by: spoon.SpoonException: Unable to load processor "org.crumbleworks.forge.jhtml5.spoon.AttributeProcessor" - Check your classpath. Did you use the --precompile option?
        at spoon.support.QueueProcessingManager.addProcessor(QueueProcessingManager.java:79)
        at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.instantiateAndProcess(JDTBasedSpoonCompiler.java:169)
        at spoon.Launcher.process(Launcher.java:719)
        at spoon.Launcher.run(Launcher.java:665)
        at spoon.Launcher.run(Launcher.java:106)
        at spoon.Launcher.main(Launcher.java:99)
        ... 6 more
Caused by: java.lang.ClassNotFoundException: org.crumbleworks.forge.jhtml5.spoon.AttributeProcessor
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at spoon.support.QueueProcessingManager.addProcessor(QueueProcessingManager.java:77)
        ... 11 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.202 s
[INFO] Finished at: 2016-10-31T12:29:50+01:00
[INFO] Final Memory: 14M/284M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.5.0:java (execute-spoon) on project JHTML5: An exception occured while executing the Java class. null: InvocationTargetException: Unable to load processor "org.crumbleworks.forge.jhtml5.spoon.AttributeProcessor" - Check your classpath. Did you use the --precompile option? -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

^{完整的maven错误输出}

唉，这一行让我很困惑……

Caused by: spoon.SpoonException: Unable to load processor "org.crumbleworks.forge.jhtml5.spoon.AttributeProcessor" - Check your classpath. Did you use the --precompile option?

…因为是的，我确实使用了——precompile选项。谢谢你的提问

---

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <version>${exec-plugin.version}</version>
    <executions>
        <execution>
            <id>execute-spoon</id>
            <phase>process-sources</phase>
            <goals>
                <goal>java</goal>
            </goals>
            <configuration>
                <classpathScope>compile</classpathScope>
                <mainClass>spoon.Launcher</mainClass>
                <arguments>
                    <argument>--with-imports</argument>
                    <argument>--processors</argument>
                    <argument>org.crumbleworks.forge.jhtml5.spoon.AttributeProcessor</argument>
                    <argument>--enable-comments</argument>
                    <argument>--precompile</argument>
                </arguments>
            </configuration>
        </execution>
    </executions>
</plugin>

^{Maven插件声明使用exec-maven-plugin(执行任何java可执行文件)}

---

那么:——precompile标志应该做什么?
分别我做错了什么?

---

编辑:
下面是一个简化的示例，其中包含maven-pom和一个描述如何在不使用maven的情况下运行和显示的自述文件:https://github.com/CrumbleWorks/Spoon-Precompile-Issue

Answer 1

--precompile选项编译作为输入的源代码，因此对于所有CtTypeReference对象，可以使用getActualClass()获得一个实际的类。此外，它还为任何控件启用getActualClass()CtType。

(这允许在相同的分析或转换中混合使用Spoon的反射和Java的反射)