什么是--precompile标志应该做什么？

时间：2016-10-31 11:36:55

标签： java compilation inria-spoon

我正在使用 Spoon 在带注释的类上生成代码，这样我就可以减少我正在处理的项目的样板和代码重复。

由于项目非常小，我一直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，这些项目必须按顺序编译，以便我的 AnnotationProcessor 可用在

查看the Spoon documentation我找到了--precompile标志，根据我的理解，它应该预编译整个源并将其添加到类路径中，以便 Spoon 找到处理器和运行时的其他东西。

但根据运行时出现的错误，它似乎无法正常工作，即使我已经添加了选项，我仍然错过了处理器。

[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:\Data\CrumbleWorks_java\JHTML5\spooned-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:\Data\CrumbleWorks_java\JHTML5\spooned-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:\Data\CrumbleWorks_java\JHTML5\spooned-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

完全maven错误输出

这条线让我感到困惑...... 

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。感谢您提问 

<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>

使用 exec-maven-plugin （执行任何java可执行文件）运行勺子的Maven插件声明

所以：什么是--precompile标志应该做什么？
我分别做错了什么？

修改的：
这是一个带有 maven-pom 的简化示例，以及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

1 个答案:

答案 0 :(得分：0)

--precompile选项编译作为输入提供的源代码，以便对于所有CtTypeReference个对象，可以使用getActualClass()获得实际的类。此外，它还可以为任何人getActualClass()启用 CtType。

（这允许在相同的分析或转换中将Spoon的反射与Java的反射混合）

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