diff --git a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
index e5cdaab..585d373 100644
--- a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
+++ b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
@@ -21,5 +21,6 @@
         findViewById(R.id.range_btn).setOnClickListener(view -> rxProcess.range());
         findViewById(R.id.interval_btn).setOnClickListener(view -> rxProcess.interval());
         findViewById(R.id.timer_btn).setOnClickListener(view -> rxProcess.timer());
+        findViewById(R.id.error_btn).setOnClickListener(view -> rxProcess.error());
     }
 }
diff --git a/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java b/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java
index 874bf94..5306172 100644
--- a/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java
+++ b/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java
@@ -166,4 +166,11 @@
                 () -> System.out.println("完了")
         );
     }
+
+    /**
+     * エラーのみを通知する
+     */
+    public void error() {
+        Flowable.error(new Exception("例外発生")).subscribe(new DebugSubscriber<>());
+    }
 }
diff --git a/app/src/main/res/layout/activity_main_java.xml b/app/src/main/res/layout/activity_main_java.xml
index bf7fc00..5a00c5d 100644
--- a/app/src/main/res/layout/activity_main_java.xml
+++ b/app/src/main/res/layout/activity_main_java.xml
@@ -65,6 +65,15 @@
             android:text="timer"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/interval_btn" />
+
+        <Button
+            android:id="@+id/error_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="error"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/timer_btn" />
+
     </android.support.constraint.ConstraintLayout>
 
 </ScrollView>