After a switch to JDK8 the MANIFEST.MF Attributes started returning null
https://bugs.openjdk.java.net/browse/JDK-8201636 suggests that this is a bug introduced by Oracle in JDK 8u151-8u172.
I use pom.xml and IntelliJ IDEA. pom.xml specifies (tags < and > removed)       
<maven.compiler.target> 1.8 </maven.compiler.target>
<maven.compiler.source> 1.8 </maven.compiler.source>
IDEA settings show target bytecode version 1.8
JAVA_HOME set to JDK10
I have C:\Program Files\Java\jdk1.8.0_201 installed.
How to specify this version for the builds. Also does pom.xml trump IDEA project settings or vice versa?
Edit:
I've specified 
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
                <verbose>true</verbose>
                <fork>true</fork>
                <!--executable>{JAVA_1_8_HOME}/bin/javac</executable-->
                <executable>C:/Program Files/Java/jdk1.8.0_201/bin/javac</executable>
                <compilerVersion>1.8</compilerVersion>
            </configuration>
        </plugin>
Intellij still defaults to JDK 1.5 and chokes on List<String> a = new ArrayList<>(); with "I don't understand <> with JDK1.5".