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```java {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_11
    toolchain {
        languageVersion.set(JavaLanguageVersion.of(11))
    }
}```

If you can, prefer using `--release` though:
```tasks {
  compileJava {
    options.release.set(8)
  }
}```
See <http://developer-blog.cloudbees.com/2014/12/beware-siren-target-call.html> and <http://www.draconianoverlord.com/2014/04/01/jdk-compatibility.html>

<@URQ797WRW> This does not work, I get:
&gt;     &gt; The new Java toolchain feature cannot be used at the project level in combination with source and/or target compatibility

<@UDC9Q9RD0>, thanks, the second link does not work

Also, <@UDC9Q9RD0>, the snippet you added compiles the bytecode to Java 8. I want the bytecode of Java 11 (55), but just make sure no language feature was used

With which version did you try? I tried with 8.1 before I sent it and it worked fine.