refactor: use JSpecify @nullable in the remaining source files

PiperOrigin-RevId: 990247212

Author: kvmilos

contrib/spring-ai/src/main/java/com/google/adk/models/springai/properties/SpringAIProperties.java

@@ -15,10 +15,10 @@
  */
 package com.google.adk.models.springai.properties;
 
-import jakarta.annotation.Nullable;
 import jakarta.validation.constraints.DecimalMax;
 import jakarta.validation.constraints.DecimalMin;
 import jakarta.validation.constraints.Min;
+import org.jspecify.annotations.Nullable;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.validation.annotation.Validated;
 
@@ -41,7 +41,7 @@
 @Validated
 public class SpringAIProperties {
 
-  @Nullable private String model;
+  private @Nullable String model;
 
   /** Default temperature for controlling randomness in responses. Must be between 0.0 and 2.0. */
   @DecimalMin(value = "0.0", message = "Temperature must be at least 0.0")

dev/src/main/java/com/google/adk/plugins/recordings/LlmRecording.java

@@ -22,7 +22,7 @@
 import com.google.auto.value.AutoValue;
 import java.util.List;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Paired LLM request and response for replay. */
 @AutoValue

dev/src/main/java/com/google/adk/plugins/recordings/Recording.java

@@ -19,7 +19,7 @@
 import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
 import com.google.auto.value.AutoValue;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Single interaction recording, ordered by request timestamp. */
 @AutoValue

dev/src/main/java/com/google/adk/plugins/recordings/ToolRecording.java

@@ -21,7 +21,7 @@
 import com.google.genai.types.FunctionCall;
 import com.google.genai.types.FunctionResponse;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Paired tool call and response for replay. */
 @AutoValue

dev/src/main/java/com/google/adk/web/dto/AgentRunRequest.java

@@ -20,7 +20,7 @@
 import com.google.adk.JsonBaseModel;
 import com.google.genai.types.Content;
 import java.util.Map;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Data Transfer Object (DTO) for POST /run and POST /run-sse requests. Contains information needed
@@ -48,8 +48,7 @@ public class AgentRunRequest {
    * replay mode settings) without modifying the stored session.
    */
   @JsonProperty("stateDelta")
-  @Nullable
-  public Map<String, Object> stateDelta;
+  public @Nullable Map<String, Object> stateDelta;
 
   public AgentRunRequest() {}
 
@@ -83,8 +82,7 @@ public boolean getStreaming() {
     return streaming;
   }
 
-  @Nullable
-  public Map<String, Object> getStateDelta() {
+  public @Nullable Map<String, Object> getStateDelta() {
     return stateDelta;
   }
 }