diff --git a/core/deployment/src/main/java/io/quarkus/deployment/pkg/NativeConfig.java b/core/deployment/src/main/java/io/quarkus/deployment/pkg/NativeConfig.java
index 8ce9e1ee949b0..e5b5f67bc0d5e 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/pkg/NativeConfig.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/pkg/NativeConfig.java
@@ -27,13 +27,13 @@ public class NativeConfig {
     /**
      * If the HTTPS url handler should be enabled, allowing you to do URL.openConnection() for HTTPS URLs
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enableHttpsUrlHandler;
 
     /**
      * If all security services should be added to the native image
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enableAllSecurityServices;
 
     /**
@@ -46,13 +46,13 @@ public class NativeConfig {
     /**
      * If all character sets should be added to the native image. This increases image size
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean addAllCharsets;
 
     /**
      * If all time zones should be added to the native image. This increases image size
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean includeAllTimeZones;
 
     /**
@@ -76,14 +76,14 @@ public class NativeConfig {
     /**
      * If debug symbols should be included
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean debugSymbols;
 
     /**
      * If the native image build should wait for a debugger to be attached before running. This is an advanced option
      * and is generally only intended for those familiar with GraalVM internals
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean debugBuildProcess;
 
     /**
@@ -95,7 +95,7 @@ public class NativeConfig {
     /**
      * If the native image server should be restarted
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean cleanupServer;
 
     /**
@@ -108,33 +108,33 @@ public class NativeConfig {
      * If a JVM based 'fallback image' should be created if native image fails. This is not recommended, as this is
      * functionally the same as just running the application in a JVM
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enableFallbackImages;
 
     /**
      * If the native image server should be used. This can speed up compilation but can result in changes not always
      * being picked up due to cache invalidation not working 100%
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enableServer;
 
     /**
      * If all META-INF/services entries should be automatically registered
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean autoServiceLoaderRegistration;
 
     /**
      * If the bytecode of all proxies should be dumped for inspection
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean dumpProxies;
 
     /**
      * If this build should be done using a container runtime. If this is set docker will be used by default,
      * unless container-runtime is also set.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean containerBuild;
 
     /**
@@ -159,7 +159,7 @@ public class NativeConfig {
     /**
      * If the resulting image should allow VM introspection
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enableVmInspection;
 
     /**
@@ -171,7 +171,7 @@ public class NativeConfig {
     /**
      * If the reports on call paths and included packages/classes/methods should be generated
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enableReports;
 
     /**
@@ -185,7 +185,7 @@ public class NativeConfig {
      * means
      * your application may fail at runtime if an unsupported feature is used by accident.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean reportErrorsAtRuntime;
 
     /**
diff --git a/core/deployment/src/main/java/io/quarkus/deployment/pkg/PackageConfig.java b/core/deployment/src/main/java/io/quarkus/deployment/pkg/PackageConfig.java
index 08b49ea5d46cd..02c8ca44c0ff3 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/pkg/PackageConfig.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/pkg/PackageConfig.java
@@ -23,7 +23,7 @@ public class PackageConfig {
     /**
      * If the java runner should be packed as an uberjar
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean uberJar;
 
     /**
diff --git a/core/runtime/src/main/java/io/quarkus/runtime/ThreadPoolConfig.java b/core/runtime/src/main/java/io/quarkus/runtime/ThreadPoolConfig.java
index 748a56a0e9fe6..2e271f4d74de9 100644
--- a/core/runtime/src/main/java/io/quarkus/runtime/ThreadPoolConfig.java
+++ b/core/runtime/src/main/java/io/quarkus/runtime/ThreadPoolConfig.java
@@ -49,7 +49,7 @@ public class ThreadPoolConfig {
      * threads beyond the core size should be created as aggressively as threads within it; a value of {@code 1.0f}
      * implies that threads beyond the core size should never be created.
      */
-    @ConfigItem(defaultValue = "0")
+    @ConfigItem
     public float growthResistance;
 
     /**
diff --git a/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/DataSourceJdbcRuntimeConfig.java b/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/DataSourceJdbcRuntimeConfig.java
index 28976cd918d5a..f3544a7892dab 100644
--- a/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/DataSourceJdbcRuntimeConfig.java
+++ b/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/DataSourceJdbcRuntimeConfig.java
@@ -28,7 +28,7 @@ public class DataSourceJdbcRuntimeConfig {
     /**
      * The datasource pool minimum size
      */
-    @ConfigItem(defaultValue = "0")
+    @ConfigItem
     public int minSize = 0;
 
     /**
diff --git a/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/LegacyDataSourceJdbcRuntimeConfig.java b/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/LegacyDataSourceJdbcRuntimeConfig.java
index 2c585f992a383..d402f97cf317e 100644
--- a/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/LegacyDataSourceJdbcRuntimeConfig.java
+++ b/extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/LegacyDataSourceJdbcRuntimeConfig.java
@@ -24,7 +24,7 @@ public class LegacyDataSourceJdbcRuntimeConfig {
     /**
      * @deprecated use quarkus.datasource.jdbc.min-size instead.
      */
-    @ConfigItem(defaultValue = "0")
+    @ConfigItem
     @Deprecated
     public int minSize = 0;
 
diff --git a/extensions/amazon-dynamodb/runtime/src/main/java/io/quarkus/dynamodb/runtime/NettyHttpClientConfig.java b/extensions/amazon-dynamodb/runtime/src/main/java/io/quarkus/dynamodb/runtime/NettyHttpClientConfig.java
index fdc93e00745a0..f4df20f0748e8 100644
--- a/extensions/amazon-dynamodb/runtime/src/main/java/io/quarkus/dynamodb/runtime/NettyHttpClientConfig.java
+++ b/extensions/amazon-dynamodb/runtime/src/main/java/io/quarkus/dynamodb/runtime/NettyHttpClientConfig.java
@@ -94,7 +94,7 @@ public class NettyHttpClientConfig {
      * <p>
      * 0 means unlimited.
      */
-    @ConfigItem(defaultValue = "0")
+    @ConfigItem
     public int maxHttp2Streams;
 
     /**
diff --git a/extensions/container-image/deployment/src/main/java/io/quarkus/container/image/deployment/ContainerImageConfig.java b/extensions/container-image/deployment/src/main/java/io/quarkus/container/image/deployment/ContainerImageConfig.java
index 1becfd23b8d53..498ad85bff0ea 100644
--- a/extensions/container-image/deployment/src/main/java/io/quarkus/container/image/deployment/ContainerImageConfig.java
+++ b/extensions/container-image/deployment/src/main/java/io/quarkus/container/image/deployment/ContainerImageConfig.java
@@ -47,18 +47,18 @@ public class ContainerImageConfig {
     /**
      * Whether or not insecure registries are allowed
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean insecure;
 
     /**
      * Whether or not a image build will be performed.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean build;
 
     /**
      * Whether or not an image push will be performed.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean push;
 }
diff --git a/extensions/datasource/runtime/src/main/java/io/quarkus/datasource/runtime/DataSourcesBuildTimeConfig.java b/extensions/datasource/runtime/src/main/java/io/quarkus/datasource/runtime/DataSourcesBuildTimeConfig.java
index c25f3a913739d..950ab6ea0fa9d 100644
--- a/extensions/datasource/runtime/src/main/java/io/quarkus/datasource/runtime/DataSourcesBuildTimeConfig.java
+++ b/extensions/datasource/runtime/src/main/java/io/quarkus/datasource/runtime/DataSourcesBuildTimeConfig.java
@@ -41,7 +41,7 @@ public class DataSourcesBuildTimeConfig {
      * NOTE: This is different from the "jdbc.enable-metrics" property that needs to be set on the JDBC datasource level to
      * enable collection of metrics for that datasource.
      */
-    @ConfigItem(name = "metrics.enabled", defaultValue = "false")
+    @ConfigItem(name = "metrics.enabled")
     public boolean metricsEnabled;
 
 }
diff --git a/extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmConfig.java b/extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmConfig.java
index 97cef720a5950..32bdd39f0036e 100644
--- a/extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmConfig.java
+++ b/extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmConfig.java
@@ -145,7 +145,7 @@ public class HibernateOrmConfig {
     /**
      * Whether or not metrics are published in case the smallrye-metrics extension is present (default to false).
      */
-    @ConfigItem(name = "metrics.enabled", defaultValue = "false")
+    @ConfigItem(name = "metrics.enabled")
     public boolean metricsEnabled;
 
     /**
@@ -212,7 +212,7 @@ public static class HibernateOrmConfigDatabase {
         /**
          * Whether we should stop on the first error when applying the schema.
          */
-        @ConfigItem(name = "generation.halt-on-error", defaultValue = "false")
+        @ConfigItem(name = "generation.halt-on-error")
         public boolean generationHaltOnError;
 
         /**
@@ -236,7 +236,7 @@ public static class HibernateOrmConfigDatabase {
         /**
          * Whether Hibernate should quote all identifiers.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         public boolean globallyQuotedIdentifiers;
 
         public boolean isAnyPropertySet() {
@@ -281,7 +281,7 @@ public static class HibernateOrmConfigLog {
          * <p>
          * Setting it to true is obviously not recommended in production.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         public boolean sql;
 
         /**
@@ -289,7 +289,7 @@ public static class HibernateOrmConfigLog {
          * <p>
          * Setting it to true is obviously not recommended in production.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         public boolean bindParam;
 
         /**
diff --git a/extensions/hibernate-search-elasticsearch/runtime/src/main/java/io/quarkus/hibernate/search/elasticsearch/runtime/HibernateSearchElasticsearchRuntimeConfig.java b/extensions/hibernate-search-elasticsearch/runtime/src/main/java/io/quarkus/hibernate/search/elasticsearch/runtime/HibernateSearchElasticsearchRuntimeConfig.java
index d7a4db5fc6722..a14fed01d8f9a 100644
--- a/extensions/hibernate-search-elasticsearch/runtime/src/main/java/io/quarkus/hibernate/search/elasticsearch/runtime/HibernateSearchElasticsearchRuntimeConfig.java
+++ b/extensions/hibernate-search-elasticsearch/runtime/src/main/java/io/quarkus/hibernate/search/elasticsearch/runtime/HibernateSearchElasticsearchRuntimeConfig.java
@@ -194,7 +194,7 @@ public static class DiscoveryConfig {
         /**
          * Defines if automatic discovery is enabled.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         boolean enabled;
 
         /**
diff --git a/extensions/infinispan-client/runtime/src/main/java/io/quarkus/infinispan/client/runtime/InfinispanClientBuildTimeConfig.java b/extensions/infinispan-client/runtime/src/main/java/io/quarkus/infinispan/client/runtime/InfinispanClientBuildTimeConfig.java
index 8143561325528..7e0eb24798934 100644
--- a/extensions/infinispan-client/runtime/src/main/java/io/quarkus/infinispan/client/runtime/InfinispanClientBuildTimeConfig.java
+++ b/extensions/infinispan-client/runtime/src/main/java/io/quarkus/infinispan/client/runtime/InfinispanClientBuildTimeConfig.java
@@ -13,7 +13,7 @@ public class InfinispanClientBuildTimeConfig {
     /**
      * Sets the bounded entry count for near cache. If this value is 0 or less near cache is disabled.
      */
-    @ConfigItem(defaultValue = "0")
+    @ConfigItem
     public int nearCacheMaxEntries;
 
     @Override
diff --git a/extensions/kubernetes-client/runtime-internal/src/main/java/io/quarkus/kubernetes/client/runtime/KubernetesClientBuildConfig.java b/extensions/kubernetes-client/runtime-internal/src/main/java/io/quarkus/kubernetes/client/runtime/KubernetesClientBuildConfig.java
index 73aac1329916d..a5512d5d1f28c 100644
--- a/extensions/kubernetes-client/runtime-internal/src/main/java/io/quarkus/kubernetes/client/runtime/KubernetesClientBuildConfig.java
+++ b/extensions/kubernetes-client/runtime-internal/src/main/java/io/quarkus/kubernetes/client/runtime/KubernetesClientBuildConfig.java
@@ -13,7 +13,7 @@ public class KubernetesClientBuildConfig {
     /**
      * Whether or not the client should trust a self signed certificate if so presented by the API server
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean trustCerts;
 
     /**
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AwsElasticBlockStoreVolumeConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AwsElasticBlockStoreVolumeConfig.java
index f90408593000e..05b7b527b0166 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AwsElasticBlockStoreVolumeConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AwsElasticBlockStoreVolumeConfig.java
@@ -30,7 +30,7 @@ public class AwsElasticBlockStoreVolumeConfig {
     /**
      * Wether the volumeName is read only or not.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean readOnly;
 
 }
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureDiskVolumeConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureDiskVolumeConfig.java
index 7e94ffa7c8b0c..961eb269a5433 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureDiskVolumeConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureDiskVolumeConfig.java
@@ -51,7 +51,7 @@ public enum Kind {
     /**
      * Wether the volumeName is read only or not.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean readOnly;
 
 }
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureFileVolumeConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureFileVolumeConfig.java
index e371879b175ce..b12501a63555c 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureFileVolumeConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AzureFileVolumeConfig.java
@@ -22,7 +22,7 @@ public class AzureFileVolumeConfig {
     /**
      * Wether the volumeName is read only or not.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean readOnly;
 
 }
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/ConfigMapVolumeConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/ConfigMapVolumeConfig.java
index 288a3b3ce03cd..e6f664ed404f1 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/ConfigMapVolumeConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/ConfigMapVolumeConfig.java
@@ -24,7 +24,7 @@ public class ConfigMapVolumeConfig {
     /**
      * Optional
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean optional;
 
 }
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KubernetesConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KubernetesConfig.java
index 567ccd729c954..f376078ef2891 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KubernetesConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KubernetesConfig.java
@@ -202,7 +202,7 @@ public class KubernetesConfig implements PlatformConfiguration {
     /**
      * If true, a Kubernetes Ingress will be created
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean expose;
 
     public Optional<String> getPartOf() {
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/MountConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/MountConfig.java
index e1f5878d88f8c..aae0839a4498e 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/MountConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/MountConfig.java
@@ -39,6 +39,6 @@ public class MountConfig {
      *
      * @return True if mount is readonly, False otherwise.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean readOnly;
 }
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/OpenshiftConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/OpenshiftConfig.java
index c39b14dabf75c..83f5feadee00e 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/OpenshiftConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/OpenshiftConfig.java
@@ -195,7 +195,7 @@ public class OpenshiftConfig implements PlatformConfiguration {
     /**
      * If true, an Openshift Route will be created
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean expose;
 
     public Optional<String> getPartOf() {
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/PvcVolumeConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/PvcVolumeConfig.java
index 64e8c0b04d669..5983955aa7e16 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/PvcVolumeConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/PvcVolumeConfig.java
@@ -25,6 +25,6 @@ public class PvcVolumeConfig {
     /**
      * Optional
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean optional;
 }
diff --git a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/SecretVolumeConfig.java b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/SecretVolumeConfig.java
index cbc5f59df1b4f..52fd1ea58ff6d 100644
--- a/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/SecretVolumeConfig.java
+++ b/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/SecretVolumeConfig.java
@@ -24,6 +24,6 @@ public class SecretVolumeConfig {
     /**
      * Optional
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     boolean optional;
 }
diff --git a/extensions/logging-gelf/runtime/src/main/java/io/quarkus/logging/gelf/GelfConfig.java b/extensions/logging-gelf/runtime/src/main/java/io/quarkus/logging/gelf/GelfConfig.java
index 906663f733ff2..c1b329d0399ed 100644
--- a/extensions/logging-gelf/runtime/src/main/java/io/quarkus/logging/gelf/GelfConfig.java
+++ b/extensions/logging-gelf/runtime/src/main/java/io/quarkus/logging/gelf/GelfConfig.java
@@ -52,7 +52,7 @@ public class GelfConfig {
      * Negative throwable reference walk the exception chain from the root cause side: -1 will extract the root cause,
      * -2 the exception wrapping the root cause, ...
      */
-    @ConfigItem(defaultValue = "0")
+    @ConfigItem
     public int stackTraceThrowableReference;
 
     /**
@@ -96,6 +96,6 @@ public class GelfConfig {
     /**
      * Whether to include all fields from the MDC.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean includeFullMdc;
 }
diff --git a/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/MongoClientConfig.java b/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/MongoClientConfig.java
index 298958f94d0db..22ec4618bacb2 100644
--- a/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/MongoClientConfig.java
+++ b/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/MongoClientConfig.java
@@ -145,13 +145,13 @@ public class MongoClientConfig {
     /**
      * If connecting with TLS, this option enables insecure TLS connections.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean tlsInsecure;
 
     /**
      * Whether to connect using TLS.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean tls;
 
     /**
diff --git a/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/WriteConcernConfig.java b/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/WriteConcernConfig.java
index 0557b9050ef9f..49b05bd00181d 100644
--- a/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/WriteConcernConfig.java
+++ b/extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/WriteConcernConfig.java
@@ -40,7 +40,7 @@ public class WriteConcernConfig {
     /**
      * If set to {@code true}, the driver will retry supported write operations if they fail due to a network error.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean retryWrites;
 
     /**
diff --git a/extensions/neo4j/runtime/src/main/java/io/quarkus/neo4j/runtime/Neo4jConfiguration.java b/extensions/neo4j/runtime/src/main/java/io/quarkus/neo4j/runtime/Neo4jConfiguration.java
index 94c48ca008b67..0f317d79eb935 100644
--- a/extensions/neo4j/runtime/src/main/java/io/quarkus/neo4j/runtime/Neo4jConfiguration.java
+++ b/extensions/neo4j/runtime/src/main/java/io/quarkus/neo4j/runtime/Neo4jConfiguration.java
@@ -53,7 +53,7 @@ static class Authentication {
         /**
          * Set this to true to disable authentication.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         public boolean disabled = false;
     }
 
@@ -63,13 +63,13 @@ static class Pool {
         /**
          * Flag, if metrics are enabled.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         public boolean metricsEnabled;
 
         /**
          * Flag, if leaked sessions logging is enabled.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         public boolean logLeakedSessions;
 
         /**
diff --git a/extensions/quartz/runtime/src/main/java/io/quarkus/quartz/runtime/QuartzRuntimeConfig.java b/extensions/quartz/runtime/src/main/java/io/quarkus/quartz/runtime/QuartzRuntimeConfig.java
index 7864ac92572a0..6486d3c7dff48 100644
--- a/extensions/quartz/runtime/src/main/java/io/quarkus/quartz/runtime/QuartzRuntimeConfig.java
+++ b/extensions/quartz/runtime/src/main/java/io/quarkus/quartz/runtime/QuartzRuntimeConfig.java
@@ -24,7 +24,7 @@ public class QuartzRuntimeConfig {
      * If set to true the scheduler will be started even if no scheduled business methods are found. This is necessary for
      * "pure" programmatic scheduling.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean forceStart;
 
 }
diff --git a/extensions/resteasy/runtime/src/main/java/io/quarkus/resteasy/runtime/JaxRsSecurityConfig.java b/extensions/resteasy/runtime/src/main/java/io/quarkus/resteasy/runtime/JaxRsSecurityConfig.java
index 9ca839d4ffb7f..dc1a8c730393d 100644
--- a/extensions/resteasy/runtime/src/main/java/io/quarkus/resteasy/runtime/JaxRsSecurityConfig.java
+++ b/extensions/resteasy/runtime/src/main/java/io/quarkus/resteasy/runtime/JaxRsSecurityConfig.java
@@ -12,6 +12,6 @@ public class JaxRsSecurityConfig {
     /**
      * if set to true, access to all JAX-RS resources will be denied by default
      */
-    @ConfigItem(name = "deny-unannotated-endpoints", defaultValue = "false")
+    @ConfigItem(name = "deny-unannotated-endpoints")
     public boolean denyJaxRs;
 }
diff --git a/extensions/security/runtime/src/main/java/io/quarkus/security/runtime/SecurityBuildTimeConfig.java b/extensions/security/runtime/src/main/java/io/quarkus/security/runtime/SecurityBuildTimeConfig.java
index 97dc505a6a1e9..1416275d7cef9 100644
--- a/extensions/security/runtime/src/main/java/io/quarkus/security/runtime/SecurityBuildTimeConfig.java
+++ b/extensions/security/runtime/src/main/java/io/quarkus/security/runtime/SecurityBuildTimeConfig.java
@@ -27,7 +27,7 @@ public class SecurityBuildTimeConfig {
      *   }
      * </pre>
      */
-    @ConfigItem(name = "deny-unannotated-members", defaultValue = "false")
+    @ConfigItem(name = "deny-unannotated-members")
     public boolean denyUnannotated;
 
 }
diff --git a/extensions/smallrye-metrics/deployment/src/main/java/io/quarkus/smallrye/metrics/deployment/SmallRyeMetricsProcessor.java b/extensions/smallrye-metrics/deployment/src/main/java/io/quarkus/smallrye/metrics/deployment/SmallRyeMetricsProcessor.java
index 664f59e6f7823..e8eb82b4660c3 100644
--- a/extensions/smallrye-metrics/deployment/src/main/java/io/quarkus/smallrye/metrics/deployment/SmallRyeMetricsProcessor.java
+++ b/extensions/smallrye-metrics/deployment/src/main/java/io/quarkus/smallrye/metrics/deployment/SmallRyeMetricsProcessor.java
@@ -115,7 +115,7 @@ static final class SmallRyeMetricsConfig {
          * The use case is to facilitate migration from Micrometer-based metrics, because original dashboards for JVM metrics
          * will continue working without having to rewrite them.
          */
-        @ConfigItem(name = "micrometer.compatibility", defaultValue = "false")
+        @ConfigItem(name = "micrometer.compatibility")
         public boolean micrometerCompatibility;
 
     }
diff --git a/extensions/smallrye-reactive-messaging/runtime/src/main/java/io/quarkus/smallrye/reactivemessaging/runtime/ReactiveMessagingConfiguration.java b/extensions/smallrye-reactive-messaging/runtime/src/main/java/io/quarkus/smallrye/reactivemessaging/runtime/ReactiveMessagingConfiguration.java
index d689d508f8871..99637d216d59a 100644
--- a/extensions/smallrye-reactive-messaging/runtime/src/main/java/io/quarkus/smallrye/reactivemessaging/runtime/ReactiveMessagingConfiguration.java
+++ b/extensions/smallrye-reactive-messaging/runtime/src/main/java/io/quarkus/smallrye/reactivemessaging/runtime/ReactiveMessagingConfiguration.java
@@ -11,6 +11,6 @@ public class ReactiveMessagingConfiguration {
      * Whether or not Reactive Messaging metrics are published in case the smallrye-metrics extension is present
      * (default to false).
      */
-    @ConfigItem(name = "metrics.enabled", defaultValue = "false")
+    @ConfigItem(name = "metrics.enabled")
     public boolean metricsEnabled;
 }
diff --git a/extensions/spring-cloud-config-client/runtime/src/main/java/io/quarkus/spring/cloud/config/client/runtime/SpringCloudConfigClientConfig.java b/extensions/spring-cloud-config-client/runtime/src/main/java/io/quarkus/spring/cloud/config/client/runtime/SpringCloudConfigClientConfig.java
index c886ce7e017ce..0230dded1cff8 100644
--- a/extensions/spring-cloud-config-client/runtime/src/main/java/io/quarkus/spring/cloud/config/client/runtime/SpringCloudConfigClientConfig.java
+++ b/extensions/spring-cloud-config-client/runtime/src/main/java/io/quarkus/spring/cloud/config/client/runtime/SpringCloudConfigClientConfig.java
@@ -15,13 +15,13 @@ public class SpringCloudConfigClientConfig {
     /**
      * If enabled, will try to read the configuration from a Spring Cloud Config Server
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enabled;
 
     /**
      * If set to true, the application will not stand up if it cannot obtain configuration from the Config Server
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean failFast;
 
     /**
diff --git a/extensions/swagger-ui/deployment/src/main/java/io/quarkus/swaggerui/deployment/SwaggerUiProcessor.java b/extensions/swagger-ui/deployment/src/main/java/io/quarkus/swaggerui/deployment/SwaggerUiProcessor.java
index c80976fc93b91..374d91cadc4d7 100644
--- a/extensions/swagger-ui/deployment/src/main/java/io/quarkus/swaggerui/deployment/SwaggerUiProcessor.java
+++ b/extensions/swagger-ui/deployment/src/main/java/io/quarkus/swaggerui/deployment/SwaggerUiProcessor.java
@@ -219,7 +219,7 @@ static final class SwaggerUiConfig {
          * If this should be included every time. By default this is only included when the application is running
          * in dev mode.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         boolean alwaysInclude;
 
         /**
diff --git a/extensions/vault/runtime/src/main/java/io/quarkus/vault/runtime/config/HealthConfig.java b/extensions/vault/runtime/src/main/java/io/quarkus/vault/runtime/config/HealthConfig.java
index a30653308b41a..01dc2e5351a91 100644
--- a/extensions/vault/runtime/src/main/java/io/quarkus/vault/runtime/config/HealthConfig.java
+++ b/extensions/vault/runtime/src/main/java/io/quarkus/vault/runtime/config/HealthConfig.java
@@ -9,20 +9,20 @@ public class HealthConfig {
     /**
      * Whether or not an health check is published in case the smallrye-health extension is present.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean enabled;
 
     /**
      * Specifies if being a standby should still return the active status code instead of the standby status code.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean standByOk;
 
     /**
      * Specifies if being a performance standby should still return the active status code instead of the performance standby
      * status code.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean performanceStandByOk;
 
 }
diff --git a/extensions/vertx-graphql/deployment/src/main/java/io/quarkus/vertx/graphql/deployment/VertxGraphqlConfig.java b/extensions/vertx-graphql/deployment/src/main/java/io/quarkus/vertx/graphql/deployment/VertxGraphqlConfig.java
index 3e84627bf9783..179f070cfb603 100644
--- a/extensions/vertx-graphql/deployment/src/main/java/io/quarkus/vertx/graphql/deployment/VertxGraphqlConfig.java
+++ b/extensions/vertx-graphql/deployment/src/main/java/io/quarkus/vertx/graphql/deployment/VertxGraphqlConfig.java
@@ -18,7 +18,7 @@ public static class VertxGraphqlUiConfig {
          * If GraphQL UI should be included every time. By default this is only included when the application is running
          * in dev mode.
          */
-        @ConfigItem(defaultValue = "false")
+        @ConfigItem
         boolean alwaysInclude;
 
         /**
diff --git a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/BodyConfig.java b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/BodyConfig.java
index dbba2cabfe78c..7d458e7e0b6c6 100644
--- a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/BodyConfig.java
+++ b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/BodyConfig.java
@@ -44,7 +44,7 @@ public class BodyConfig {
      * If {@code true} the uploaded files stored in {@code quarkus.http.body-handler.uploads-directory} will be removed
      * after handling the request. Otherwise the files will be left there forever.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean deleteUploadedFilesOnEnd;
 
     /**
@@ -53,6 +53,6 @@ public class BodyConfig {
      * If {@code true} the body buffer is pre-allocated according to the size read from the {@code Content-Length}
      * header. Otherwise the body buffer is pre-allocated to 1KB, and is resized dynamically
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean preallocateBodyBuffer;
 }
\ No newline at end of file
diff --git a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/HttpConfiguration.java b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/HttpConfiguration.java
index da370e15026aa..e10f81898dadc 100644
--- a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/HttpConfiguration.java
+++ b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/HttpConfiguration.java
@@ -16,7 +16,7 @@ public class HttpConfiguration {
     /**
      * Enable the CORS filter.
      */
-    @ConfigItem(name = "cors", defaultValue = "false")
+    @ConfigItem(name = "cors")
     public boolean corsEnabled;
 
     /**
@@ -59,14 +59,14 @@ public class HttpConfiguration {
      * If this is true then the address, scheme etc will be set from headers forwarded by the proxy server, such as
      * {@code X-Forwarded-For}. This should only be set if you are behind a proxy that sets these headers.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean proxyAddressForwarding;
 
     /**
      * If this is true and proxy address forwarding is enabled then the standard {@code Forwarded} header will be used,
      * rather than the more common but not standard {@code X-Forwarded-For}.
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean allowForwarded;
 
     /**
@@ -147,25 +147,25 @@ public class HttpConfiguration {
     /**
      * Enable socket reuse port (linux/macOs native transport only)
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean soReusePort;
 
     /**
      * Enable tcp quick ack (linux native transport only)
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean tcpQuickAck;
 
     /**
      * Enable tcp cork (linux native transport only)
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean tcpCork;
 
     /**
      * Enable tcp fast open (linux native transport only)
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean tcpFastOpen;
 
     /**
@@ -177,7 +177,7 @@ public class HttpConfiguration {
     /**
      * Enable listening to host:port
      */
-    @ConfigItem(defaultValue = "false")
+    @ConfigItem
     public boolean domainSocketEnabled;
 
     /**