Make using virtual threads optional

Author: pboos

spring-boot-starter/spring-boot-starter-core/src/main/java/com/getyourguide/openapi/validation/OpenApiValidationApplicationProperties.java

@@ -38,6 +38,7 @@ public class OpenApiValidationApplicationProperties {
     private List<String> excludedHeaders;
     private Boolean shouldFailOnRequestViolation;
     private Boolean shouldFailOnResponseViolation;
+    private Boolean enableVirtualThreads;
 
     public double getSampleRate() {
         return sampleRate != null ? sampleRate : SAMPLE_RATE_DEFAULT;
@@ -84,6 +85,10 @@ public List<ExcludedHeader> getExcludedHeaders() {
             .toList();
     }
 
+    public boolean isEnableVirtualThreads() {
+        return enableVirtualThreads != null ? enableVirtualThreads : false;
+    }
+
     public OpenApiRequestValidationConfiguration toOpenApiRequestValidationConfiguration() {
         return OpenApiRequestValidationConfiguration.builder()
             .sampleRate(getSampleRate())

spring-boot-starter/spring-boot-starter-core/src/main/java/com/getyourguide/openapi/validation/autoconfigure/LibraryAutoConfiguration.java

@@ -119,11 +119,11 @@ public OpenApiRequestValidator openApiRequestValidator(
     }
 
     private Executor createThreadPoolExecutor() {
-        if (VirtualThreadLimitedExecutor.isSupported()) {
+        if (properties.isEnableVirtualThreads() && VirtualThreadLimitedExecutor.isSupported()) {
             return new VirtualThreadLimitedExecutor();
         }
 
-        // Fallback to ThreadPoolExecutor with regular threads for older Java versions
+        // Fallback to ThreadPoolExecutor with regular threads
         return new ThreadPoolExecutor(
             2,
             2,