java – Spring启动和maven exec插件问题
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我创建了一个裸骨Maven项目,除了pom.xml之外完全是空的.
使用此pom(请注意,父元素已注释掉):
<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>springboot-test</groupId>
<artifactId>springboot-test</artifactId>
<version>1.0.0-SNAPSHOT</version>
<!-- <parent> -->
<!-- <groupId>org.springframework.boot</groupId> -->
<!-- <artifactId>spring-boot-starter-parent</artifactId> -->
<!-- <version>1.1.9.RELEASE</version> -->
<!-- </parent> -->
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
样品运行:
$mvn exec:java -Dexec.mainClass=test
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building springboot-test 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (default-cli) @ springboot-test ---
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.
[WARNING]
java.lang.ClassNotFoundException: test
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:281)
at java.lang.Thread.run(Thread.java:745)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.480 s
[INFO] Finished at: 2014-12-05T13:45:34-05:00
[INFO] Final Memory: 8M/176M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java (default-cli) on project springboot-test: An exception occured while executing the Java class. test -> [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
这是预期的(这个项目没有clas测试).
使用这个pom(即只是取消评论的父母):
<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>springboot-test</groupId>
<artifactId>springboot-test</artifactId>
<version>1.0.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.9.RELEASE</version>
</parent>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
样品运行:
$mvn exec:java -Dexec.mainClass=test
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building springboot-test 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> exec-maven-plugin:1.2.1:java (default-cli) > validate @ springboot-test >>>
[INFO]
[INFO] <<< exec-maven-plugin:1.2.1:java (default-cli) < validate @ springboot-test <<<
[INFO]
[INFO] --- exec-maven-plugin:1.2.1:java (default-cli) @ springboot-test ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.550 s
[INFO] Finished at: 2014-12-05T13:45:27-05:00
[INFO] Final Memory: 12M/178M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project springboot-test: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java are missing or invalid -> [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/PluginParameterException
exec-maven-plugin也是如此:1.3.2:
$mvn org.codehaus.mojo:exec-maven-plugin:1.3.2:java -Dexec.mainClass=test
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building springboot-test 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (default-cli) @ springboot-test ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.400 s
[INFO] Finished at: 2014-12-05T13:52:46-05:00
[INFO] Final Memory: 6M/157M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java (default-cli) on project springboot-test: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java are missing or invalid -> [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/PluginParameterException
附加信息:
$java -version
java version "1.8.0_11"
Java(TM) SE Runtime Environment (build 1.8.0_11-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)
$mvn -v
Apache Maven 3.2.2 (45f7c06d68e745d05611f7fd14efb6594181933e; 2014-06-17T09:51:42-04:00)
Maven home: C:\dev\bin\apache-maven-3.2.2
Java version: 1.8.0_11, vendor: Oracle Corporation
Java home: C:\progra~1\java\jdk1.8.0_11\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos"
问题:
>为什么这会失败/如何解决?
>为什么添加父级时失败? exec-maven-plugin是如何受此影响的?
(作为旁注,我喜欢Windows 7属于faimly的事实:“dos”,我正在等待家庭:“cp / m”将在Windows 8.1中实现)
解决方法:
这是因为Spring-Boot正在为您的项目添加一些额外的maven配置.
如果你正在使用eclipse,那么有一个名为:’Effective POM’的标签.
在此标签中,您可以看到它在下面添加了以下代码段:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>${start-class}</mainClass>
</configuration>
</plugin>
因此,当你使用spring-boot作为父运行它时,它会查找${start-class}的值,除非你定义它,否则会解析为空,当你看到没有mainClass参数值的错误时.
将此添加到您的项目:
<properties>
<start-class>com.Test</start-class>
</properties>
然后运行它:clean compile exec:java
[INFO] --- exec-maven-plugin:1.2.1:java (default-cli) @ springboot-test --- **********test************** [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.388 s [INFO] Finished at: 2014-12-05T15:25:05-06:00 [INFO] Final Memory: 17M/231M [INFO] ------------------------------------------------------------------------
您还可以在命令行上提供start-class属性的值,即使您没有在pom文件中定义它,这也可以工作:
mvn exec:java -Dstart-class = com.Test
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