ADK changes

core/src/main/java/com/google/adk/agents/ActiveStreamingTool.java

@@ -18,7 +18,7 @@
 package com.google.adk.agents;
 
 import io.reactivex.rxjava3.disposables.Disposable;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Manages streaming tool related resources during invocation. */
 public class ActiveStreamingTool {

core/src/main/java/com/google/adk/agents/ConfigAgentUtils.java

@@ -35,7 +35,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Consumer;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

core/src/main/java/com/google/adk/agents/InvocationContext.java

@@ -33,7 +33,7 @@
 import java.util.Optional;
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** The context for an agent invocation. */
 public class InvocationContext {

core/src/main/java/com/google/adk/agents/LiveRequest.java

@@ -26,7 +26,7 @@
 import com.google.genai.types.Blob;
 import com.google.genai.types.Content;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Represents a request to be sent to a live connection to the LLM model. */
 @AutoValue

core/src/main/java/com/google/adk/agents/LlmAgent.java

@@ -71,7 +71,7 @@
 import java.util.Optional;
 import java.util.concurrent.Executor;
 import java.util.function.Function;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

core/src/main/java/com/google/adk/agents/RunConfig.java

@@ -22,7 +22,7 @@
 import com.google.genai.types.AudioTranscriptionConfig;
 import com.google.genai.types.Modality;
 import com.google.genai.types.SpeechConfig;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

core/src/main/java/com/google/adk/agents/ToolResolver.java

@@ -32,7 +32,7 @@
 import java.lang.reflect.Modifier;
 import java.util.List;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

core/src/main/java/com/google/adk/apps/App.java

@@ -24,7 +24,7 @@
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import java.util.List;
 import java.util.regex.Pattern;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Represents an LLM-backed agentic application.

core/src/main/java/com/google/adk/events/Event.java

@@ -39,7 +39,7 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 // TODO - b/413761119 update Agent.java when resolved.
 /** Represents an event in a session. */

core/src/main/java/com/google/adk/events/ToolConfirmation.java

@@ -21,7 +21,7 @@
 import com.google.adk.JsonBaseModel;
 import com.google.auto.value.AutoValue;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Represents a tool confirmation configuration. */
 @AutoValue

core/src/main/java/com/google/adk/flows/llmflows/Contents.java

@@ -42,7 +42,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** {@link RequestProcessor} that populates content in request for LLM flows. */
 public final class Contents implements RequestProcessor {

core/src/main/java/com/google/adk/memory/MemoryEntry.java

@@ -22,7 +22,7 @@
 import com.google.auto.value.AutoValue;
 import com.google.genai.types.Content;
 import java.time.Instant;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Represents one memory entry. */
 @AutoValue

core/src/main/java/com/google/adk/models/LlmResponse.java

@@ -33,7 +33,7 @@
 import com.google.genai.types.GroundingMetadata;
 import java.util.List;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Represents a response received from the LLM. */
 @AutoValue

core/src/main/java/com/google/adk/models/VertexCredentials.java

@@ -19,7 +19,7 @@
 import com.google.auth.oauth2.GoogleCredentials;
 import com.google.auto.value.AutoValue;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Credentials for accessing Gemini models through Vertex. */
 @AutoValue

core/src/main/java/com/google/adk/plugins/agentanalytics/BigQueryLoggerConfig.java

@@ -25,7 +25,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.function.BiFunction;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Configuration for the BigQueryAgentAnalyticsPlugin. */
 @AutoValue

core/src/main/java/com/google/adk/runner/Runner.java

@@ -64,7 +64,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** The main class for the GenAI Agents runner. */
 public class Runner {

core/src/main/java/com/google/adk/sessions/BaseSessionService.java

@@ -28,7 +28,7 @@
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Defines the contract for managing {@link Session}s and their associated {@link Event}s. Provides

core/src/main/java/com/google/adk/sessions/SessionJsonConverter.java

@@ -39,7 +39,7 @@
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

core/src/main/java/com/google/adk/sessions/State.java

@@ -24,7 +24,7 @@
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** A {@link State} object that also keeps track of the changes to the state. */
 @SuppressWarnings("ShouldNotSubclass")

core/src/main/java/com/google/adk/sessions/VertexAiClient.java

@@ -18,8 +18,8 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeoutException;
-import javax.annotation.Nullable;
 import okhttp3.ResponseBody;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

core/src/main/java/com/google/adk/summarizer/EventsCompactionConfig.java

@@ -18,7 +18,7 @@
 
 import com.google.auto.value.AutoBuilder;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Configuration for event compaction.

core/src/main/java/com/google/adk/tools/BaseToolset.java

@@ -19,7 +19,7 @@
 import com.google.adk.agents.ReadonlyContext;
 import io.reactivex.rxjava3.core.Flowable;
 import java.util.List;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Base interface for toolsets. */
 public interface BaseToolset extends AutoCloseable {

core/src/main/java/com/google/adk/tools/FunctionTool.java

@@ -36,7 +36,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -222,8 +222,7 @@ public Method func() {
   }
 
   /** Returns the underlying function's {@link Object} instance if present. */
-  @Nullable
-  Object instance() {
+  @Nullable Object instance() {
     return instance;
   }
 

core/src/main/java/com/google/adk/tools/LongRunningFunctionTool.java

@@ -19,7 +19,7 @@
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.google.adk.utils.ComponentRegistry;
 import java.lang.reflect.Method;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** A function tool that returns the result asynchronously. */
 public class LongRunningFunctionTool extends FunctionTool {

core/src/main/java/com/google/adk/tools/ToolContext.java

@@ -24,7 +24,7 @@
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import io.reactivex.rxjava3.core.Single;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** ToolContext object provides a structured context for executing tools or functions. */
 public class ToolContext extends CallbackContext {

core/src/main/java/com/google/adk/tools/ToolPredicate.java

@@ -18,7 +18,7 @@
 
 import com.google.adk.agents.ReadonlyContext;
 import java.util.Optional;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Functional interface to decide whether a tool should be exposed to the LLM based on the current

core/src/main/java/com/google/adk/tools/applicationintegrationtoolset/CredentialsHelper.java

@@ -5,7 +5,7 @@
 import java.net.http.HttpRequest;
 import java.util.List;
 import java.util.Map;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * This interface provides a method to convert a service account JSON string to a Google Credentials

core/src/main/java/com/google/adk/tools/applicationintegrationtoolset/GoogleCredentialsHelper.java

@@ -7,7 +7,7 @@
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 public final class GoogleCredentialsHelper implements CredentialsHelper {
 

core/src/main/java/com/google/adk/tools/mcp/McpAsyncToolset.java

@@ -35,7 +35,7 @@
 import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Mono;

core/src/main/java/com/google/adk/tools/mcp/SseServerParameters.java

@@ -23,7 +23,7 @@
 import com.google.common.collect.ImmutableMap;
 import java.time.Duration;
 import java.util.Map;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Parameters for establishing a MCP Server-Sent Events (SSE) connection. */
 @AutoValue

core/src/main/java/com/google/adk/tools/mcp/StdioServerParameters.java

@@ -25,7 +25,7 @@
 import io.modelcontextprotocol.client.transport.ServerParameters;
 import java.util.List;
 import java.util.Map;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Parameters for establishing a MCP stdio connection. */
 @AutoValue

core/src/main/java/com/google/adk/tools/mcp/StreamableHttpServerParameters.java

@@ -21,7 +21,7 @@
 import java.time.Duration;
 import java.util.Collections;
 import java.util.Map;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /** Server parameters for Streamable HTTP client transport. */
 public class StreamableHttpServerParameters {

core/src/main/java/com/google/adk/tools/retrieval/VertexAiRagRetrieval.java

@@ -40,7 +40,7 @@
 import java.util.List;
 import java.util.Map;
 import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;