Java compilation problem -- default methods not allowed

Question

I am developing a Java program and just wanting to compile when I ran into this odd error (included below). I am using java version "1.8.0_31" and I do not have any other version installed on my MAC.
Can anyone tell me what this error is? I tried google'ing but didn't reveal anything relevant yet. Thanks

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project inspectorBee: Compilation failure: Compilation failure:
[ERROR] /Users/vincentyau1/Development/testingbee/inspectorbee/src/main/java/io/beeCloud/inspectorBee/resources/execution/Executable.java:[9,9] default methods are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable default methods)
[ERROR] /Users/vincentyau1/Development/testingbee/inspectorbee/src/main/java/io/beeCloud/inspectorBee/service/InspectorBeeService.java:[125,68] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)

The source parameter for the compilation is set to 1.5. Adjust the parameter value in the properties — KevinO, Oct 28 '18 at 23:26
@KevinO how do I adjust that? I do not see such a field in pom.xml. — Vince Yau, Oct 28 '18 at 23:35
@KevinO I do not see project.xml anywhere in my project source tree. I also searched my entire hard drive and don't see it either. Where do I find this file? — Vince Yau, Oct 29 '18 at 00:20
unless you are referring to pom.xml. And I cannot see such a field in pom.xml either. — Vince Yau, Oct 29 '18 at 00:28
Usually set in the project, but can be set in the pom.xml also: https://www.mkyong.com/maven/how-to-tell-maven-to-use-java-8/ — KevinO, Oct 29 '18 at 00:29
But I believe this approach is the preferred: https://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html — KevinO, Oct 29 '18 at 00:30

Java compilation problem -- default methods not allowed

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