Source Option 5 Error

It appears that newer versions of Maven or Java—I haven't narrowed it down (I'm running Maven 3.8.3 and Java 16)—fail to build this project. The error says:

```
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ herokujavasample ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 2 source files to C:\Users\School\Microservices\java-worker-dyno-playground\devcenter-java-worker\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Source option 5 is no longer supported. Use 7 or later.
[ERROR] Target option 5 is no longer supported. Use 7 or later.
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.778 s
[INFO] Finished at: 2021-10-11T14:38:42-06:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project herokujavasample: Compilation failure: Compilation failure:
[ERROR] Source option 5 is no longer supported. Use 7 or later.
[ERROR] Target option 5 is no longer supported. Use 7 or later.
```

It appears, however, that [adding the target version](https://stackoverflow.com/a/61941759/5432315) solves the issue.

```

1.8
1.8

```

Start by locating the Maven compiler configuration that produces source and target option 5, then review the reported Java and Maven versions and the proposed compiler properties. Verify the project builds successfully without the unsupported source-option error; the issue does not name a specific file or test.

Scritto dal modello di indicizzazione a partire dal testo della issue.