Don't wrap exceptions thrown by component adapters

moshi/records-tests/src/test/java/com/squareup/moshi/records/RecordsTest.java

@@ -17,10 +17,13 @@
 
 import static com.google.common.truth.Truth.assertThat;
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
+import static org.junit.Assert.fail;
 
 import com.squareup.moshi.FromJson;
 import com.squareup.moshi.Json;
 import com.squareup.moshi.JsonQualifier;
+import com.squareup.moshi.JsonReader;
+import com.squareup.moshi.JsonWriter;
 import com.squareup.moshi.Moshi;
 import com.squareup.moshi.ToJson;
 import com.squareup.moshi.Types;
@@ -31,6 +34,7 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import okio.Buffer;
 import org.junit.Test;
 
 public final class RecordsTest {
@@ -192,4 +196,41 @@ public void jsonName() throws IOException {
   }
 
   public static record JsonName(@Json(name = "actualValue") int value) {}
+
+  /**
+   * We had a bug where we were incorrectly wrapping exceptions thrown when delegating to the
+   * JsonAdapters of component fields.
+   */
+  @Test
+  public void memberEncodeDecodeThrowsExceptionException() throws IOException {
+    var throwingAdapter =
+        new Object() {
+          @ToJson
+          void booleanToJson(JsonWriter writer, boolean value) throws IOException {
+            throw new IOException("boom!");
+          }
+
+          @FromJson
+          boolean booleanFromJson(JsonReader reader) throws IOException {
+            throw new IOException("boom!");
+          }
+        };
+    var json = "{\"value\":true}";
+    Moshi throwingMoshi = this.moshi.newBuilder().add(throwingAdapter).build();
+    var adapter = throwingMoshi.adapter(BooleanRecord.class);
+    try {
+      adapter.fromJson(json);
+      fail();
+    } catch (IOException expected) {
+      assertThat(expected).hasMessageThat().isEqualTo("boom!");
+    }
+    try {
+      adapter.toJson(new Buffer(), new BooleanRecord(true));
+      fail();
+    } catch (IOException expected) {
+      assertThat(expected).hasMessageThat().isEqualTo("boom!");
+    }
+  }
+
+  public static record BooleanRecord(boolean value) {}
 }

moshi/src/main/java16/com/squareup/moshi/RecordJsonAdapter.java

@@ -197,8 +197,9 @@ public void toJson(JsonWriter writer, T value) throws IOException {
 
     for (var binding : componentBindingsArray) {
       writer.name(binding.jsonName);
+      Object componentValue;
       try {
-        binding.adapter.toJson(writer, binding.accessor.invoke(value));
+        componentValue = binding.accessor.invoke(value);
       } catch (Throwable e) {
         if (e instanceof InvocationTargetException ite) {
           Throwable cause = ite.getCause();
@@ -209,6 +210,7 @@ public void toJson(JsonWriter writer, T value) throws IOException {
           throw new AssertionError(e);
         }
       }
+      binding.adapter.toJson(writer, componentValue);
     }
 
     writer.endObject();