azure-toolkit-libs/azure-toolkit-springcloud-lib/src/main/java/com/microsoft/azure/toolkit/lib/springcloud/SpringCloudDeploymentDraft.java [197:209]:
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    private static String formalizeRuntimeVersion(String runtimeVersion) {
        if (StringUtils.isEmpty(runtimeVersion)) {
            return DEFAULT_RUNTIME_VERSION;
        }
        final String fixedRuntimeVersion = StringUtils.trim(runtimeVersion);
        final Matcher matcher = Pattern.compile(RUNTIME_VERSION_PATTERN).matcher(fixedRuntimeVersion);
        if (matcher.matches()) {
            return Objects.equals(matcher.group(3), "8") ? SpringCloudJavaVersion.JAVA_8 : SpringCloudJavaVersion.JAVA_11;
        } else {
            log.warn("{} is not a valid runtime version, supported values are Java 8 and Java 11, using Java 8 in this deployment.", fixedRuntimeVersion);
            return DEFAULT_RUNTIME_VERSION;
        }
    }
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azure-toolkit-libs/azure-toolkit-springcloud-lib/src/main/java/com/microsoft/azure/toolkit/lib/springcloud/config/SpringCloudDeploymentConfig.java [83:95]:
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    public static String normalize(String runtimeVersion) {
        if (StringUtils.isEmpty(runtimeVersion)) {
            return DEFAULT_RUNTIME_VERSION;
        }
        final String fixedRuntimeVersion = StringUtils.trim(runtimeVersion);
        final Matcher matcher = Pattern.compile(RUNTIME_VERSION_PATTERN).matcher(fixedRuntimeVersion);
        if (matcher.matches()) {
            return Objects.equals(matcher.group(3), "8") ? SpringCloudJavaVersion.JAVA_8 : SpringCloudJavaVersion.JAVA_11;
        } else {
            log.warn("{} is not a valid runtime version, supported values are Java 8 and Java 11, using Java 8 in this deployment.", fixedRuntimeVersion);
            return DEFAULT_RUNTIME_VERSION;
        }
    }
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