Avoid always displaying a warning about Java version

While we can't be too strict in the check, we can at least avoid
displaying the warning when things look fine.

Author: gsmet

extensions/azure-functions/deployment/src/main/java/io/quarkus/azure/functions/deployment/AzureFunctionsDeployCommand.java

@@ -11,6 +11,7 @@
 import java.util.List;
 import java.util.Optional;
 import java.util.concurrent.Callable;
+import java.util.regex.Pattern;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -79,7 +80,8 @@ public class AzureFunctionsDeployCommand {
             "please refer to https://aka.ms/maven_function_configuration#supported-pricing-tiers for valid values";
     private static final String EXPANDABLE_REGION_WARNING = "'%s' may not be a valid region, " +
             "please refer to https://aka.ms/maven_function_configuration#supported-regions for valid values";
-    private static final String EXPANDABLE_JAVA_VERSION_WARNING = "'%s' may not be a valid java version, recommended values are `Java 17` and `Java 21`";
+    private static final Pattern JAVA_VERSION_PATTERN = Pattern.compile("(java )?[0-9]+", Pattern.CASE_INSENSITIVE);
+    private static final String EXPANDABLE_JAVA_VERSION_WARNING = "'%s' may not be a valid java version, recommended values are `17` or `21`";
 
     protected static final String USING_AZURE_ENVIRONMENT = "Using Azure environment: %s.";
 
@@ -201,7 +203,8 @@ protected void validateParameters(AzureFunctionsConfig config, String appName) t
             throw new BuildException(INVALID_OS);
         }
         // java version
-        if (StringUtils.isNotEmpty(config.runtime().javaVersion())) {
+        if (StringUtils.isNotEmpty(config.runtime().javaVersion())
+                && !JAVA_VERSION_PATTERN.matcher(config.runtime().javaVersion()).matches()) {
             log.warn(format(EXPANDABLE_JAVA_VERSION_WARNING, config.runtime().javaVersion()));
         }
         // pricing tier