无法使用Java高于1.8的maven-compiler-plugin进行编译

Question

我有一个基于NetBeans maven的项目，我想从Java 1.8切换到12但我无法编译它。

经过多次尝试，我决定从头开始，创建一个非常简单的项目来了解如何进行此更改。

好吧，我已经尝试过，我也无法编译这个简单的项目。

有人能解释我做错了吗？

前言

NetBeans：10.0

JAVA_HOME：C：\ Program Files \ Java \ jdk-12（我也试过了9,10,11）

胃：

项目创建

1. 使用窗口创建项目（第一个TopComponent）

2. 我将JDK版本从11（NetBeans 10.0中的默认值）更改为12

3. 这是自动生成的POM和javax.annotation-api依赖项

   <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>
   <parent>
       <groupId>it.prj</groupId>
       <artifactId>Project-parent</artifactId>
       <version>2.9</version>
   </parent>
   <artifactId>Project-source</artifactId>
   <packaging>nbm</packaging>
   <build>
       <plugins>
           <plugin>
               <groupId>org.codehaus.mojo</groupId>
               <artifactId>nbm-maven-plugin</artifactId>
               <extensions>true</extensions>
               <configuration>
                   <useOSGiDependencies>true</useOSGiDependencies>
               </configuration>
           </plugin>
           <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-jar-plugin</artifactId>
               <configuration>
                   <useDefaultManifestFile>true</useDefaultManifestFile>
               </configuration>
           </plugin>
       </plugins>
   </build>
   <dependencies>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-netbeans-api-annotations-common</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-openide-windows</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-openide-util</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-openide-util-ui</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-openide-util-lookup</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-openide-awt</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>org.netbeans.api</groupId>
           <artifactId>org-netbeans-modules-settings</artifactId>
           <version>${netbeans.version}</version>
       </dependency>
       <dependency>
           <groupId>javax.annotation</groupId>
           <artifactId>javax.annotation-api</artifactId>
           <version>1.3.2</version>
           <type>jar</type>
       </dependency>
   </dependencies>
   <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>

4. 然后我开始Clean＆Build> SUCCESS
5. 我将Java版本从1.7更改为12

这将相关的插件添加到POM

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>12</source>
                <target>12</target>
            </configuration>
        </plugin>

6. 更新版本字段，使其变为：

      <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.8.0</version>
           <configuration>
               <source>12</source>
               <target>12</target>
           </configuration>
       </plugin>

7. 然后我重新启动Clean＆Build> FAILED cd D:\Project\Project-source; "JAVA_HOME=C:\\Program Files\\Java\\jdk-12" "M2_HOME=C:\\Program Files\\apache-maven-3.6.0" cmd /c "\"\"C:\\Program Files\\apache-maven-3.6.0\\bin\\mvn.cmd\" -Dmaven.ext.class.path=\"C:\\Program Files\\Netbeans 10.0\\java\\maven-nblib\\netbeans-eventspy.jar\" -Dfile.encoding=UTF-8 clean install\"" 建设项目源2.9 --- maven-clean-plugin：2.5：clean（default-clean）@Project-source ---

删除D：\ Project \ Project-source \ target

--- maven-resources-plugin:3.1.0:resources (default-resources) @ Project-source ---

Using 'UTF-8' encoding to copy filtered resources.
Copying 1 resource

--- maven-compiler-plugin:3.8.0:compile (default-compile) @ Project-source ---
Changes detected - recompiling the module!
Compiling 1 source file to D:\Project\Project-source\target\classes

--- nbm-maven-plugin:4.1:manifest (default-manifest) @ Project-source ---
NBM Plugin generates manifest
Adding OSGi bundle dependency - javax.annotation:javax.annotation-api
------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Failed to execute goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest (default-manifest) on project Project-source: 
Execution default-manifest of goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest failed.: IllegalArgumentException 

编辑

8. 我试图删除nbm-maven-plugin，但是这改变了Project的结构，我不知道如何重新包含这个模块

Answer 1

在你的例子中nbm-maven-plugin失败但编译过程很好。

暂时从你的构建中删除nbm-maven-plugin，看看Maven是否可以在没有它的情况下构建。也许您可以完全跳过此插件，因为它似乎仅适用于NetBeans IDE。

Answer 2

请使用这样的4.2版本：

<groupId>org.apache.netbeans.utilities</groupId>
<artifactId>nbm-maven-plugin</artifactId>
<version>4.2</version>

替换任何引用：

 <groupId>org.codehaus.mojo</groupId>
 <artifactId>nbm-maven-plugin</artifactId>

由jdk> 8生成的jar文件无法通过旧版本的插件进行解析。