编译组合groovy和java的错误（使用maven） [英] Compile error combining groovy and java (using maven)
问题描述
我想为我的域对象使用groovy来摆脱setter / getters的样板代码等等。
但是我有一个使用AST转换的问题，特别是生成的构造函数。
这里有一些最低限度的复制代码：
App.java
package experiment.groovy;
public class App {
public static void main（String [] args）{
示例示例= new示例（Alex）;
System.out.println（example.getName（））;
$ b Example.groovy
package experiment.groovy
import groovy.transform.Canonical
@Canonical
class示例{
字符串名称;
int id;
$ / code>
项目结构
http://i60.tinypic.com/2eebx1e.gif
pom.xml
< project xmlns =http：//maven.apache。 org / POM / 4.0.0
xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
xsi：schemaLocation =
http：// maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd\">
< modelVersion> 4.0.0< / modelVersion>
< groupId> experiment.groovy< / groupId>
< artifactId> groovy-ast< / artifactId>
< version> 1.0-SNAPSHOT< / version>
<依赖关系>
< dependency>
< groupId> org.codehaus.groovy< / groupId>
< artifactId> groovy-all< / artifactId>
< version> 2.3.0< / version>
< /依赖关系>
< /依赖关系>
< build>
< plugins>
< plugin>
< groupId> org.codehaus.gmaven< / groupId>
< artifactId> gmaven-plugin< / artifactId>
<执行次数>
<执行>
<目标>
< goal> generateStubs< / goal>
< goal>编译< / goal>
< goal> generateTestStubs< / goal>
< goal> testCompile< / goal>
< /目标>
< /执行>
< /执行次数>
< / plugin>
< / plugins>
< / build>
< / project>
我也尝试过使用 groovy-eclipse-compiler ：
< build>
< plugins>
< plugin>
< groupId> org.apache.maven.plugins< / groupId>
< artifactId> maven-compiler-plugin< / artifactId>
< version> 3.1< / version>
<配置>
< compilerId> groovy-eclipse-compiler< / compilerId>
< source> 1.7< / source>
< target> 1.7< / target>
< / configuration>
<依赖关系>
< dependency>
< groupId> org.codehaus.groovy< / groupId>
< artifactId> groovy-eclipse-compiler< / artifactId>
< version> 2.8.0-01< / version>
< /依赖关系>
< dependency>
< groupId> org.codehaus.groovy< / groupId>
< artifactId> groovy-eclipse-batch< / artifactId>
< version> 2.1.8-01< / version>
< /依赖关系>
< /依赖关系>
< / plugin>
< / plugins>
< / build>
和 mvn compile 失败，错误。
1。错误在C：\DEV\Groovy\src\main\java\experiment\groovy\ZApp.java（在第5行）
[错误]编译错误：
示例example = new示例（ToDelete）;
[INFO] ------------------------------------------- ------------------
^^^^^^^^^^^^^^^^^^^^^^^
[错误]找到1个错误和0个警告。
构造函数Example（String）未定义
所以问题是：我应该改变什么，或者，可能，这是不可能的？
PS在将来，如果它很重要，我会将 javax.persistence.Entity 注释添加到Example类。
解决方案我会在Groovy用户邮件列表。我认为问题是生成的Java存根包含'id'和'name'的getter和setter，但不包含AST的构造函数。我不确定这是一个错误还是已知的限制。但我认为像这样的东西本该工作，所以我更倾向于前者。
编辑：这显然不适用于Groovy-Eclipse插件对于Maven，因为它不使用存根。我不太了解它可能会导致这种情况。
编辑2：我无法控制我的好奇心。我已经在邮件列表中问了。
编辑3：查看Guillaume的回答此处。基本上，Java应用程序存根是在应用AST转换之前生成的，因此Java无法看到添加了@Canonical的构造函数。你的解决方案是可行的，因为它将Java绑定到类文件，而不是存根。另一种方法是使用适用于Maven的Groovy-Eclipse编译器插件。
I want to use groovy for my domain object to get rid of boilerplate code of setter/getters and so on.
But I have a issue with using AST transformations, particularly with generated constructors.
Here some minimum code for reproduction:
App.java
package experiment.groovy;
public class App {
public static void main(String[] args) {
Example example = new Example("Alex");
System.out.println(example.getName());
}
}
Example.groovy
package experiment.groovy
import groovy.transform.Canonical
@Canonical
class Example {
String name;
int id;
}
Project structure
http://i60.tinypic.com/2eebx1e.gif
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>experiment.groovy</groupId>
<artifactId>groovy-ast</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.gmaven</groupId>
<artifactId>gmaven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>generateStubs</goal>
<goal>compile</goal>
<goal>generateTestStubs</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
I also tried with groovy-eclipse-compiler:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<compilerId>groovy-eclipse-compiler</compilerId>
<source>1.7</source>
<target>1.7</target>
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>2.8.0-01</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-batch</artifactId>
<version>2.1.8-01</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
And mvn compile failing with error.
1. ERROR in C:\DEV\Groovy\src\main\java\experiment\groovy\ZApp.java (at line 5)
[ERROR] COMPILATION ERROR :
Example example = new Example("ToDelete");
[INFO] -------------------------------------------------------------
^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] Found 1 error and 0 warnings.
The constructor Example(String) is undefined
So the question is: what should I change, OR, may be, it is impossible?
P.S. In future, if it is important, I will add javax.persistence.Entity annotation to the Example class.
解决方案 I'd ask about this on the Groovy user mailing list. I think the issue is that the Java stub generated contains getters and setters for 'id' and 'name', but doesn't include the constructors from the AST. I'm not sure whether that's a bug or a known limitation. But I thought things like this were supposed to work, so I'm leaning more towards the former.
Edit: This obviously wouldn't apply to the Groovy-Eclipse plugin for Maven since it doesn't use stubs. I don't know enough about it to say what might cause this there.
Edit 2: I couldn't contain my curiosity. I've gone ahead and asked on the mailing list.
Edit 3: See Guillaume's answer here. Basically the Java stubs are generated before the AST transformation has been applied, so Java isn't able to see the constructors @Canonical added. Your solution works because it's tying Java to the class file, not the stub. An alternative would be to use the Groovy-Eclipse Compiler Plugin for Maven.
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