Android: Closeable lifecycle, error reporting, thread safety, and test coverage

Combines all previously reverted Android improvement PRs (#18669,
#19012, #19028, #19092, #19099, #19124) plus new Module lifecycle
tests into a single atomic change.

Error reporting: all sync errors throw exceptions instead of
returning status codes or logging silently. Module.loadMethod()
throws ExecutorchRuntimeException on failure. LlmModule.generate()
and load() throw on error. Native methods renamed with "Native"
suffix; public wrappers check status and throw.

Lifecycle: Module, LlmModule, and TrainingModule implement
Closeable for try-with-resources. LlmModule adds ReentrantLock
to serialize access to non-thread-safe native state. stop()
remains lock-free (C++ atomic flag). TrainingModule replaces
Log.e silent failures with IllegalStateException.

Error consistency: ExecuTorchRuntime.validateFilePath throws
IllegalArgumentException. SGD throws IllegalStateException.
AsrModule throws ExecutorchRuntimeException. Cause-chaining
constructor added to ExecutorchRuntimeException.

JNI safety: Module and LlmModule constructors wrapped in
try-catch to surface native initialization failures.
LlmModule.load() uses throwExecutorchException with diagnostic
detail. All @DoNotStrip annotations preserved on JNI-called
methods; new @DoNotStrip added to renamed private native methods
(generateNative, resetContextNative, loadNative).

Tests: fix 4 @ignored Module tests by providing required input
tensor. Add 13 new lifecycle/API coverage tests. Add LlmModule
use-after-close and idempotent-close tests. Fix ModelRunner crash
on loadMethod failure.

This PR was authored with the help of Claude.

Author: psiddh

extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/LlmModuleInstrumentationTest.kt

@@ -54,9 +54,7 @@ class LlmModuleInstrumentationTest : LlmCallback {
   @Test
   @Throws(IOException::class, URISyntaxException::class)
   fun testGenerate() {
-    val loadResult = llmModule.load()
-    // Check that the model can be load successfully
-    assertEquals(OK.toLong(), loadResult.toLong())
+    llmModule.load()
 
     llmModule.generate(TEST_PROMPT, SEQ_LEN, this@LlmModuleInstrumentationTest)
     assertEquals(results.size.toLong(), SEQ_LEN.toLong())
@@ -273,11 +271,26 @@ class LlmModuleInstrumentationTest : LlmCallback {
     }
   }
 
+  // --- Lifecycle tests ---
+
+  @Test
+  fun testUseAfterCloseThrows() {
+    llmModule.close()
+    assertThrows(IllegalStateException::class.java) {
+      llmModule.generate(TEST_PROMPT, SEQ_LEN, this@LlmModuleInstrumentationTest)
+    }
+  }
+
+  @Test
+  fun testCloseIsIdempotent() {
+    llmModule.close()
+    llmModule.close()
+  }
+
   companion object {
     private const val TEST_FILE_NAME = "/stories.pte"
     private const val TOKENIZER_FILE_NAME = "/tokenizer.bin"
     private const val TEST_PROMPT = "Hello"
-    private const val OK = 0x00
     private const val SEQ_LEN = 32
   }
 }

extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/ModuleInstrumentationTest.kt

@@ -17,7 +17,6 @@ import java.util.concurrent.atomic.AtomicInteger
 import org.apache.commons.io.FileUtils
 import org.junit.Assert
 import org.junit.Before
-import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.pytorch.executorch.TestFileUtils.getTestFilePath
@@ -40,49 +39,42 @@ class ModuleInstrumentationTest {
     inputStream.close()
   }
 
-  @Ignore(
-      "The forward has failure that needs to be fixed before enabling this test: [Executorch Error 0x12] Invalid argument: Execution failed for method: forward "
-  )
   @Test
   @Throws(IOException::class, URISyntaxException::class)
   fun testModuleLoadAndForward() {
     val module = Module.load(getTestFilePath(TEST_FILE_NAME))
-
-    val results = module.forward()
-    Assert.assertTrue(results[0].isTensor)
-  }
-
-  @Test
-  @Throws(IOException::class, URISyntaxException::class)
-  fun testMethodMetadata() {
-    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    try {
+      val results = module.forward(EValue.from(dummyInput()))
+      Assert.assertTrue(results[0].isTensor)
+    } finally {
+      module.destroy()
+    }
   }
 
-  @Ignore(
-      "The forward has failure that needs to be fixed before enabling this test: [Executorch Error 0x12] Invalid argument: Execution failed for method: forward "
-  )
   @Test
   @Throws(IOException::class)
   fun testModuleLoadMethodAndForward() {
     val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    try {
+      module.loadMethod(FORWARD_METHOD)
 
-    val loadMethod = module.loadMethod(FORWARD_METHOD)
-    Assert.assertEquals(loadMethod.toLong(), OK.toLong())
-
-    val results = module.forward()
-    Assert.assertTrue(results[0].isTensor)
+      val results = module.forward(EValue.from(dummyInput()))
+      Assert.assertTrue(results[0].isTensor)
+    } finally {
+      module.destroy()
+    }
   }
 
-  @Ignore(
-      "The forward has failure that needs to be fixed before enabling this test: [Executorch Error 0x12] Invalid argument: Execution failed for method: forward "
-  )
   @Test
   @Throws(IOException::class)
   fun testModuleLoadForwardExplicit() {
     val module = Module.load(getTestFilePath(TEST_FILE_NAME))
-
-    val results = module.execute(FORWARD_METHOD)
-    Assert.assertTrue(results[0].isTensor)
+    try {
+      val results = module.execute(FORWARD_METHOD, EValue.from(dummyInput()))
+      Assert.assertTrue(results[0].isTensor)
+    } finally {
+      module.destroy()
+    }
   }
 
   @Test(expected = RuntimeException::class)
@@ -95,18 +87,26 @@ class ModuleInstrumentationTest {
   @Throws(IOException::class)
   fun testModuleLoadMethodNonExistantMethod() {
     val module = Module.load(getTestFilePath(TEST_FILE_NAME))
-
-    val loadMethod = module.loadMethod(NONE_METHOD)
-    Assert.assertEquals(loadMethod.toLong(), INVALID_ARGUMENT.toLong())
+    try {
+      val exception =
+          Assert.assertThrows(ExecutorchRuntimeException::class.java) {
+            module.loadMethod(NONE_METHOD)
+          }
+      Assert.assertEquals(
+          ExecutorchRuntimeException.INVALID_ARGUMENT,
+          exception.getErrorCode(),
+      )
+    } finally {
+      module.destroy()
+    }
   }
 
   @Test(expected = RuntimeException::class)
   @Throws(IOException::class)
   fun testNonPteFile() {
     val module = Module.load(getTestFilePath(NON_PTE_FILE_NAME))
 
-    val loadMethod = module.loadMethod(FORWARD_METHOD)
-    Assert.assertEquals(loadMethod.toLong(), INVALID_ARGUMENT.toLong())
+    module.loadMethod(FORWARD_METHOD)
   }
 
   @Test
@@ -116,27 +116,21 @@ class ModuleInstrumentationTest {
 
     module.destroy()
 
-    val loadMethod = module.loadMethod(FORWARD_METHOD)
-    Assert.assertEquals(loadMethod.toLong(), INVALID_STATE.toLong())
+    Assert.assertThrows(IllegalStateException::class.java) { module.loadMethod(FORWARD_METHOD) }
   }
 
   @Test
   @Throws(IOException::class)
   fun testForwardOnDestroyedModule() {
     val module = Module.load(getTestFilePath(TEST_FILE_NAME))
 
-    val loadMethod = module.loadMethod(FORWARD_METHOD)
-    Assert.assertEquals(loadMethod.toLong(), OK.toLong())
+    module.loadMethod(FORWARD_METHOD)
 
     module.destroy()
 
-    val results = module.forward()
-    Assert.assertEquals(0, results.size.toLong())
+    Assert.assertThrows(IllegalStateException::class.java) { module.forward() }
   }
 
-  @Ignore(
-      "The forward has failure that needs to be fixed before enabling this test: [Executorch Error 0x12] Invalid argument: Execution failed for method: forward "
-  )
   @Test
   @Throws(InterruptedException::class, IOException::class)
   fun testForwardFromMultipleThreads() {
@@ -150,7 +144,7 @@ class ModuleInstrumentationTest {
       try {
         latch.countDown()
         latch.await(5000, TimeUnit.MILLISECONDS)
-        val results = module.forward()
+        val results = module.forward(EValue.from(dummyInput()))
         Assert.assertTrue(results[0].isTensor)
         completed.incrementAndGet()
       } catch (_: InterruptedException) {}
@@ -167,6 +161,139 @@ class ModuleInstrumentationTest {
     }
 
     Assert.assertEquals(numThreads.toLong(), completed.get().toLong())
+    module.destroy()
+  }
+
+  // --- Load mode tests ---
+
+  @Test
+  @Throws(IOException::class)
+  fun testLoadWithMmapMode() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME), Module.LOAD_MODE_MMAP)
+    try {
+      val results = module.forward(EValue.from(dummyInput()))
+      Assert.assertTrue(results[0].isTensor)
+    } finally {
+      module.destroy()
+    }
+  }
+
+  @Test
+  @Throws(IOException::class)
+  fun testLoadWithFileMode() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME), Module.LOAD_MODE_FILE)
+    try {
+      val results = module.forward(EValue.from(dummyInput()))
+      Assert.assertTrue(results[0].isTensor)
+    } finally {
+      module.destroy()
+    }
+  }
+
+  // --- getMethods / getMethodMetadata tests ---
+
+  @Test
+  @Throws(IOException::class)
+  fun testGetMethods() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    try {
+      val methods = module.getMethods()
+      Assert.assertNotNull(methods)
+      Assert.assertTrue(methods.contains(FORWARD_METHOD))
+    } finally {
+      module.destroy()
+    }
+  }
+
+  @Test
+  @Throws(IOException::class)
+  fun testGetMethodMetadata() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    try {
+      val metadata = module.getMethodMetadata(FORWARD_METHOD)
+      Assert.assertNotNull(metadata)
+      Assert.assertEquals(FORWARD_METHOD, metadata.name)
+      Assert.assertNotNull(metadata.backends)
+    } finally {
+      module.destroy()
+    }
+  }
+
+  // --- Log buffer tests ---
+
+  @Test
+  @Throws(IOException::class)
+  fun testReadLogBuffer() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    try {
+      val logs = module.readLogBuffer()
+      Assert.assertNotNull(logs)
+    } finally {
+      module.destroy()
+    }
+  }
+
+  @Test
+  fun testReadLogBufferStatic() {
+    val logs = Module.readLogBufferStatic()
+    Assert.assertNotNull(logs)
+  }
+
+  // --- etdump test ---
+
+  @Test
+  @Throws(IOException::class)
+  fun testEtdump() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    try {
+      module.etdump()
+    } finally {
+      module.destroy()
+    }
+  }
+
+  // --- Destroyed-state tests for remaining methods ---
+
+  @Test
+  @Throws(IOException::class)
+  fun testGetMethodsOnDestroyedModule() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    module.destroy()
+    Assert.assertThrows(IllegalStateException::class.java) { module.getMethods() }
+  }
+
+  @Test
+  @Throws(IOException::class)
+  fun testGetMethodMetadataOnDestroyedModule() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    module.destroy()
+    Assert.assertThrows(IllegalStateException::class.java) {
+      module.getMethodMetadata(FORWARD_METHOD)
+    }
+  }
+
+  @Test
+  @Throws(IOException::class)
+  fun testReadLogBufferOnDestroyedModule() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    module.destroy()
+    Assert.assertThrows(IllegalStateException::class.java) { module.readLogBuffer() }
+  }
+
+  @Test
+  @Throws(IOException::class)
+  fun testEtdumpOnDestroyedModule() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    module.destroy()
+    Assert.assertThrows(IllegalStateException::class.java) { module.etdump() }
+  }
+
+  @Test
+  @Throws(IOException::class)
+  fun testDoubleDestroyIsSafe() {
+    val module = Module.load(getTestFilePath(TEST_FILE_NAME))
+    module.destroy()
+    module.destroy()
   }
 
   companion object {
@@ -175,9 +302,8 @@ class ModuleInstrumentationTest {
     private const val NON_PTE_FILE_NAME = "/test.txt"
     private const val FORWARD_METHOD = "forward"
     private const val NONE_METHOD = "none"
-    private const val OK = 0x00
-    private const val INVALID_STATE = 0x2
-    private const val INVALID_ARGUMENT = 0x12
-    private const val ACCESS_FAILED = 0x22
+    private val inputShape = longArrayOf(1, 3, 224, 224)
+
+    private fun dummyInput(): Tensor = Tensor.ones(inputShape, DType.FLOAT)
   }
 }

extension/android/executorch_android/src/main/java/org/pytorch/executorch/ExecuTorchRuntime.java

@@ -36,12 +36,25 @@ public static ExecuTorchRuntime getRuntime() {
   /**
    * Validates that the given path points to a readable file.
    *
-   * @throws RuntimeException if the file does not exist or is not readable.
+   * @throws IllegalArgumentException if the path is null, does not exist, is not a file, or is not
+   *     readable.
    */
   public static void validateFilePath(String path, String description) {
+    if (path == null) {
+      throw new IllegalArgumentException("Cannot load " + description + ": path is null");
+    }
     File file = new File(path);
-    if (!file.canRead() || !file.isFile()) {
-      throw new RuntimeException("Cannot load " + description + " " + path);
+    if (!file.exists()) {
+      throw new IllegalArgumentException(
+          "Cannot load " + description + ": path does not exist: " + path);
+    }
+    if (!file.isFile()) {
+      throw new IllegalArgumentException(
+          "Cannot load " + description + ": path is not a file: " + path);
+    }
+    if (!file.canRead()) {
+      throw new IllegalArgumentException(
+          "Cannot load " + description + ": path is not readable: " + path);
     }
   }