那些遇到过的问题

Maven构建编译错误:无法执行目标org.apache.maven.plugins:maven-compiler-plugin:3.1:在项目Maven上编译(default-compile)

rog*_*hat 29 java build maven maven-compiler-plugin

我有一个maven项目分叉并从git repo克隆到我的eclipse上.它建立在Java 8之上.我做的第一件事是执行a 

mvn clean install
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但我收到以下失败消息:

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ Maven ---
[INFO] Deleting /Users/vshukla/git/Prism/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Maven ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/vshukla/git/Prism/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Maven ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 66 source files to /Users/vshukla/git/Prism/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/scanUtility.java:[54,52] diamond operator is not supported in -source 1.5
  (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/AppUtility.java:[87,86] diamond operator is not supported in -source 1.5
  (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/ComparisionUtility.java:[58,52] diamond operator is not supported in -source 1.5
  (use -source 7 or higher to enable diamond operator)
[INFO] 3 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.266 s
[INFO] Finished at: 2017-03-01T12:11:27+05:30
[INFO] Final Memory: 13M/309M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure:
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/scanUtility.java:[54,52] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/AppUtility.java:[87,86] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/ComparisionUtility.java:[58,52] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)
[ERROR] -> [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/MojoFailureException
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但是,下面是项目的构建路径详细信息,显然有JRE - 8设置: 建立路径

和编译设置:

合规水平

无论我构建项目多少次,我都会遇到同样的错误.即使在清理项目并从日食中刷新它也无济于事.请指导.

更新:

添加属性后设置maven编译器插件

<properties>
 <maven.compiler.source>1.8</maven.compiler.source>
 <maven.compiler.target>1.8</maven.compiler.target>
</properties>
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,

我收到以下错误:

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ Maven ---
[INFO] Deleting /Users/vshukla/git/Prism/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Maven ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/vshukla/git/Prism/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Maven ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 66 source files to /Users/vshukla/git/Prism/target/classes
[INFO] -------------------------------------------------------------
[WARNING] COMPILATION WARNING : 
[INFO] -------------------------------------------------------------
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java uses or overrides a deprecated API.
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: Recompile with -Xlint:deprecation for details.
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: Some input files use unchecked or unsafe operations.
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: Recompile with -Xlint:unchecked for details.
[INFO] 4 warnings 
[INFO] -------------------------------------------------------------
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[26,22] package com.apple.eawt does not exist
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,41] cannot find symbol
  symbol: class Application
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,67] cannot find symbol
  symbol: variable Application
[INFO] 3 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.591 s
[INFO] Finished at: 2017-03-01T13:09:47+05:30
[INFO] Final Memory: 21M/347M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure:
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[26,22] package com.apple.eawt does not exist
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,41] cannot find symbol
[ERROR] symbol: class Application
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,67] cannot find symbol
[ERROR] symbol: variable Application
[ERROR] -> [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/MojoFailureException
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以下是从MainUITabbed类中提供编译错误的代码片段:

import com.apple.eawt.Application;
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {


                Application application = Application.getApplication(); // line 93

                ImageIcon imgicon = new ImageIcon(getClass().getResource(
                        "ICON.jpg"));
                Image img = imgicon.getImage();


                application.setDockIconImage(img);

                MainUITabbed frame = new MainUITabbed();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();

            }
        }
    });
}
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小智 48

将此添加到POM为我修复它.请根据需要调整版本

...
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>
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  • `source` 和 `target` 是这些 JDK 版本吗？ (4认同)
  • 将其添加到我的 pom 文件中对我有用......但我仍然不明白为什么。使用 java 12，我可以通过命令行对我的简单项目进行清理打包。但是当我尝试通过 Maven 执行相同操作时，我收到了这篇文章中描述的错误。当你说“代码不适合那里使用的默认编译器”时，你指的是maven的代码，还是项目本身的代码？我同样在 eclipse 中将我的 java 编译器设置为版本 12，因此据我所知，它应该使用相同的 java 版本...... (3认同)

Mar*_*nik 14

我不认为IDE在这里是相关的.毕竟你正在运行一个Maven,Maven没有一个允许编译钻石操作符的源代码.所以,我认为你应该配置maven-compiler-plugin本身.

你可以在这里阅读这个.但一般来说,尝试添加以下属性:

<properties>
 <maven.compiler.source>1.8</maven.compiler.source>
 <maven.compiler.target>1.8</maven.compiler.target>
</properties>
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并查看它是否仅在Maven中编译.

小智 6

您应该将代码添加到 pom.xml 中，例如：

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>
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use*_*882 6

这是一个令人恼火的错误，偶尔会弹出，记下一些有助于：

无论是通过 Intellij 还是命令行，从 Eclipse 角度编写答案作为基本逻辑都将保持不变

  1. Rt 单击您的项目 -> Maven -> 更新项目 -> 选择强制更新 -> 单击确定
  2. 在属性标签下，添加： 
<maven.compiler.source>1.8</maven.compiler.source> 
<maven.compiler.target>1.8</maven.compiler.target>
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  1. 在某些情况下，您将开始看到错误，因为我们尝试强制更新说， 无法从 Y 路径传输 X 依赖项，将不会重新尝试解决方案，bla bla bla

    在这种情况下，通过 cd 快速将其修复到 .m2/repository 文件夹并运行以下命令：

for /r %i in (*.lastUpdated) do del %i
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sno*_*lli 5

就我而言，它是由与 OpenJDK 9 不兼容引起的（我没有调查过）。

如果您不需要 JDK 9，临时解决方法是将其从您的机器中清除：

sudo apt-get remove --purge openjdk-9-jdk openjdk-9-jre 
sudo apt-get remove --purge openjdk-9-jdk-headless openjdk-9-jre-headless
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nit*_*n44 5

兄弟，
如果每一个都是最新的，即使你遇到这个问题，那么
尝试直接从终端运行这个命令，而不是从 eclipse 运行。
$ mvn clean install

并确保这些事情：

  • maven在系统路径中
  • 所有 Maven 依赖项均可在“.m2/repository”中获取
  • java在系统路径中


Par*_*mal 5

确保 java 主路径正确。就我而言，pom 文件中的 java 主路径是错误的。

  <properties>
        <java.home>/usr/java/jdk1.8.0_45/bin/javac</java.home>
  </properties>




              <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                        <version>3.5.1</version>
                <configuration>
                      <verbose>true</verbose>
                      <fork>true</fork>
                      <executable>${java.home}</executable>
                   <compilerVersion>1.8</compilerVersion>
                   <source>1.8</source>
                   <target>1.8</target>
                 </configuration>
             </plugin>
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Fei*_*hou 5

如果你的本地jdk版本是11或者9、10，你项目的java源/目标版本是1.8，并且你使用的是org.projectlombok:lombokpackage，那么你可以尝试更新它的版本到1.16.22或者1.18.12，像这样：

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>
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它刚刚解决了我的问题。

Bas*_*que 5

<maven.compiler.release>（不是source＆target）

\n

其他几个答案显示<maven.compiler.source>& <maven.compiler.target>。现在，这两个元素都被更简单的单个元素所取代：<maven.compiler.release>。

\n
<maven.compiler.release>15</maven.compiler.release>\n
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所以这：

\n
  <!--old-school-->\n  <properties>\n    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>\n    <maven.compiler.source>15</maven.compiler.source>\n    <maven.compiler.target>15</maven.compiler.target>\n  </properties>\n
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\xe2\x80\xa6 变为：

\n
  <!--modern-->\n  <properties>\n    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>\n    <maven.compiler.release>15</maven.compiler.release>\n  </properties>\n
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请参阅问题，\xe2\x80\x9cmaven.compiler.release\xe2\x80\x9d 作为源和目标的替代品？

\n

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