maven报错：不再支持源选项 5。请使用 6 或更高版本

问题描述
在执行命令 mvn compile 发生错误

D:\Github_NOTES\JavaWeb_Learning\02Java\JavaWeb\Code\Maven1>mvn clean
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.example:Maven1:jar:1.0-SNAPSHOT
[WARNING] 'dependencies.dependency.version' for junit:junit:jar is either LATEST or RELEASE (both of them are being deprecated) @ line 14, column 22
[WARNING] 'dependencies.dependency.version' for junit:junit:jar is either LATEST or RELEASE (both of them are being deprecated) @ line 20, column 22
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: junit:junit:jar -> duplicate declaration of version RELEASE @ line 17, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] -------------------------< org.example:Maven1 >-------------------------
[INFO] Building Maven1 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ Maven1 ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.326 s
[INFO] Finished at: 2020-07-18T21:39:15+08:00
[INFO] ------------------------------------------------------------------------

D:\Github_NOTES\JavaWeb_Learning\02Java\JavaWeb\Code\Maven1>mvn compile
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.example:Maven1:jar:1.0-SNAPSHOT
[WARNING] 'dependencies.dependency.version' for junit:junit:jar is either LATEST or RELEASE (both of them are being deprecated) @ line 14, column 22
[WARNING] 'dependencies.dependency.version' for junit:junit:jar is either LATEST or RELEASE (both of them are being deprecated) @ line 20, column 22
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: junit:junit:jar -> duplicate declaration of version RELEASE @ line 17, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] -------------------------< org.example:Maven1 >-------------------------
[INFO] Building Maven1 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Maven1 ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Maven1 ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
[INFO] Compiling 1 source file to D:\Github_NOTES\JavaWeb_Learning\02Java\JavaWeb\Code\Maven1\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] 不再支持源选项 5。请使用 7 或更高版本。
[ERROR] 不再支持目标选项 5。请使用 7 或更高版本。
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.529 s
[INFO] Finished at: 2020-07-18T21:41:39+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven1: Compilation failure: Compilation failure:
[ERROR] 不再支持源选项 5。请使用 7 或更高版本。
[ERROR] 不再支持目标选项 5。请使用 7 或更高版本。
[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

解决方案
pom.xml文件中增加maven编译的jdk版本设置，maven.compiler.source和maven.compiler.target，另外java.version最好也加上

     <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>