您可以通过将以下属性添加到pom.xml文件中来指定Maven源/目标版本
<properties> <maven.compiler.source>1.6</maven.compiler.source> <maven.compiler.target>1.6</maven.compiler.target></properties>解决方法 这一切都发生在我尝试通过以下方式构建springboot应用程序时 ./mvnw clean install
当我第一次运行install命令时，它遇到以下问题。
[INFO] ------------------------------------------------------------------------[INFO] BUILD FAILURE[INFO] ------------------------------------------------------------------------[INFO] Total time: 2.749s[INFO] Finished at: Fri Jun 21 02:14:32 IST 2013[INFO] Final Memory: 4M/15M[INFO] ------------------------------------------------------------------------**[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project spring-social-twitter4j: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile failed: A required class was missing while executing org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile: org/codehaus/plexus/compiler/CompilerException**[ERROR] -----------------------------------------------------[ERROR] realm = plugin>org.apache.maven.plugins:maven-compiler-plugin:2.3.2[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy[ERROR] urls[0] = file:/C:/Users/SS%20Computer/.m2/repository/org/apache/maven/plugins/maven-compiler-plugin/2.3.2/maven-compiler-plugin-2.3.2.jar[ERROR] urls[1] = file:/C:/Users/SS%20Computer/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar[ERROR] Number of foreign imports: 1[ERROR] import: Entry[import from realm ClassRealm[maven.api,parent: null]][ERROR] [ERROR] -----------------------------------------------------: org.codehaus.plexus.compiler.CompilerException[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/PluginContainerException
然后，我陷入另一个问题
[ERROR] Source option 1.5 is no longer supported. Use 1.6 or later.[ERROR] Target option 1.5 is no longer supported. Use 1.6 or later.
我在OS X上。mvn -v显示：
Maven home: /Users/matthuntington/Desktop/apache-maven-3.5.0Java version: 9,vendor: Oracle CorporationJava home: /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/HomeDefault locale: en_US,platform encoding: UTF-8OS name: 'mac os x',version: '10.12.6',arch: 'x86_64',family: 'mac'
这是我的pom文件
<?xml version='1.0' encoding='UTF-8'?><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>com.packtpub.restapp</groupId> <artifactId>ticket-management</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>ticket-management</name> <description>Demo project for Spring Boot</description> <properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.0.1.RELEASE</version></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> <version>1.5.7.RELEASE</version></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <version>1.5.7.RELEASE</version></dependency><dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.2</version></dependency><dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.0.0.RELEASE</version></dependency><dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.0.1.RELEASE</version></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <version>1.5.7.RELEASE</version></dependency> </dependencies> <build><plugins> <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId> </plugin></plugins> </build></project>
