path specifies execution environment JavaSE-15. There are no JREs installed in the workspace that are strictly compatible with this environment. helloWorldBuild pathJRE System Library Problem code example
Example: Build path specifies execution environment JavaSE-1.8. There are no JREs installed in the workspace that are strictly compatible with this environment.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>