diff --git a/modules/core/session-core/src/main/java/com/lingniu/ingest/session/SessionProperties.java b/modules/core/session-core/src/main/java/com/lingniu/ingest/session/SessionProperties.java
index 01c4d03a..d928c38b 100644
--- a/modules/core/session-core/src/main/java/com/lingniu/ingest/session/SessionProperties.java
+++ b/modules/core/session-core/src/main/java/com/lingniu/ingest/session/SessionProperties.java
@@ -7,7 +7,7 @@ import java.time.Duration;
 @ConfigurationProperties(prefix = "lingniu.ingest.session")
 public class SessionProperties {
 
-    private Store store = Store.MEMORY;
+    private Store store = Store.REDIS;
 
     private Duration ttl = Duration.ofMinutes(30);
 
@@ -16,6 +16,9 @@ public class SessionProperties {
     }
 
     public void setStore(Store store) {
+        if (store == Store.MEMORY) {
+            throw new IllegalStateException("session.store supports only redis; configured value: memory");
+        }
         this.store = store;
     }
 
diff --git a/modules/core/session-core/src/main/java/com/lingniu/ingest/session/config/SessionCoreAutoConfiguration.java b/modules/core/session-core/src/main/java/com/lingniu/ingest/session/config/SessionCoreAutoConfiguration.java
index 07c80b79..d742db71 100644
--- a/modules/core/session-core/src/main/java/com/lingniu/ingest/session/config/SessionCoreAutoConfiguration.java
+++ b/modules/core/session-core/src/main/java/com/lingniu/ingest/session/config/SessionCoreAutoConfiguration.java
@@ -17,15 +17,10 @@ import org.springframework.data.redis.core.StringRedisTemplate;
 @EnableConfigurationProperties(SessionProperties.class)
 public class SessionCoreAutoConfiguration {
 
-    @Bean
-    @ConditionalOnProperty(prefix = "lingniu.ingest.session", name = "store", havingValue = "memory")
-    public Object rejectedLegacyMemorySessionStore() {
-        throw new IllegalStateException("session.store=memory has been removed; configure session.store=redis");
-    }
-
     @Bean
     @ConditionalOnBean(StringRedisTemplate.class)
-    @ConditionalOnProperty(prefix = "lingniu.ingest.session", name = "store", havingValue = "redis")
+    @ConditionalOnProperty(prefix = "lingniu.ingest.session", name = "store", havingValue = "redis",
+            matchIfMissing = true)
     @ConditionalOnMissingBean
     public SessionStore redisSessionStore(StringRedisTemplate redis, SessionProperties properties) {
         // Redis 只保存会话元数据索引；真实 Netty Channel 仍在各协议进程本地内存中。
diff --git a/modules/core/session-core/src/test/java/com/lingniu/ingest/session/config/SessionCoreAutoConfigurationTest.java b/modules/core/session-core/src/test/java/com/lingniu/ingest/session/config/SessionCoreAutoConfigurationTest.java
index 7b42483e..2a57c150 100644
--- a/modules/core/session-core/src/test/java/com/lingniu/ingest/session/config/SessionCoreAutoConfigurationTest.java
+++ b/modules/core/session-core/src/test/java/com/lingniu/ingest/session/config/SessionCoreAutoConfigurationTest.java
@@ -43,12 +43,22 @@ class SessionCoreAutoConfigurationTest {
     }
 
     @Test
-    void rejectsLegacyMemorySessionStoreMode() {
+    void usesRedisSessionStoreByDefaultWhenRedisTemplateExists() {
+        contextRunner
+                .withBean(StringRedisTemplate.class, () -> mock(StringRedisTemplate.class))
+                .run(context -> {
+                    assertThat(context).hasSingleBean(SessionStore.class);
+                    assertThat(context).hasSingleBean(RedisSessionStore.class);
+                });
+    }
+
+    @Test
+    void rejectsMemorySessionStoreModeWithRedisOnlyRule() {
         contextRunner
                 .withPropertyValues("lingniu.ingest.session.store=memory")
                 .run(context -> assertThat(context.getStartupFailure())
                         .hasRootCauseInstanceOf(IllegalStateException.class)
-                        .hasMessageContaining("session.store=memory has been removed")
-                        .hasMessageContaining("session.store=redis"));
+                        .hasStackTraceContaining("session.store supports only redis")
+                        .hasStackTraceContaining("memory"));
     }
 }