Java maven 项目，构建失败版本不匹配

Question

I have cloned a git repo and am trying to build it locally, but getting the following error

[INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 0.850 s [INFO] Finished at: 2021-07-12T15:42:57+02:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project gtvg: Fatal error compiling: invalid flag: --release -> [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

I have java jdk 8 and 11 installed, currently using java 8

java -version                                                                                                                        

16:03:24
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_242-b08)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.242-b08, mixed mode)

and maven

 mvn -version   

Apache Maven 3.6.3 

the pom.xml is really large, so I will post the part which I assume is relevant

  <properties>
   <java.version>8</java.version>
   <maven.compiler.source>${java.version}</maven.compiler.source>
   <maven.compiler.target>${java.version}</maven.compiler.target>
   <maven.compiler.release>${java.version}</maven.compiler.release>
   <project.build.sourceEncoding>US-ASCII</project.build.sourceEncoding>
   <thymeleaf.version>3.0.12.RELEASE</thymeleaf.version>
 </properties>


<build>

<resources>

  <resource>
    <directory>src/main/resources</directory>
  </resource>
  <resource>
    <directory>src/main/java</directory>
    <includes>
      <include>**/*.properties</include>
      <include>**/*.xml</include>
      <include>**/*.html</include>
    </includes>
  </resource>
  
</resources>

    
<plugins>

  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.1</version>
  </plugin>
  
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>3.2.0</version>
  </plugin>

  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>3.3.1</version>
    <configuration>
      <failOnMissingWebXml>false</failOnMissingWebXml>
    </configuration>
  </plugin>

  <plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
  </plugin>

</plugins>
    

I had hoped (not sure if I am doing the right thing) changing from 3.8.1

<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>

to 3.6.3

<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.3</version>

could solve my issues. But that doesn't work and end up getting another error

Cannot resolve plugin org.apache.maven.plugins:maven-compiler-plugin:3.6.3

How do i get it to build successfully? I am flexible regarding Java versions. I am allowed to use Java 8 - Java 12, but if possible no changes to the Maven version. It should stay as is 3.6.3

Answer 1

You could write one of both 8 or 1.8 into your java version property to declare Java 8. And using Java 8 you can not use maven.compiler.release which could be used only with Java 9+

<java.version>8</java.version>
<maven.compiler.source>${java.version}</maven.compiler.source>
<maven.compiler.target>${java.version}</maven.compiler.target>