throw new InvalidUserDataException("The configured executable is a directory (" + executableFile.getAbsolutePath() + ")");
        }
        return executableAbsoluteFile;
    }

    public static File resolveJavaHomeOfExecutable(String executable) {
        // Relying on the layout of the toolchain distribution: <JAVA HOME>/bin/<executable>
        return resolveExecutable(executable).getParentFile().getParentFile();
    }

    public static SpecificInstallationToolchainSpec fromJavaExecutable(ObjectFactory objectFactory, String executable) {
        return objectFactory.newInstance(SpecificInstallationToolchainSpec.class, JavaExecutableUtils.resolveJavaHomeOfExecutable(executable));
    }

    @Override
    public Key toKey() {
        return new Key(javaHome);
    }

    @Override
    public boolean isConfigured() {
        return true;
    }

            // because the custom executable can be set to the path of another tool in the toolchain such as a launcher (java).
            File customExecutableJavaHome = JavaExecutableUtils.resolveJavaHomeOfExecutable(customExecutablePath);
            JavaExecutableUtils.validateMatchingFiles(
                customExecutableJavaHome, "Toolchain from `executable` property on `ForkOptions`",