diff --git a/src/main/java/org/janelia/saalfeldlab/n5/FileSystemKeyValueAccess.java b/src/main/java/org/janelia/saalfeldlab/n5/FileSystemKeyValueAccess.java
index cb7444f5..cfb45592 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/FileSystemKeyValueAccess.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/FileSystemKeyValueAccess.java
@@ -291,7 +291,7 @@ public URI uri(final String normalPath) throws URISyntaxException {
 		try {
 			final URI normalUri = URI.create(normalPath);
 			if (normalUri.isAbsolute()) return normalUri.normalize();
-		} catch (IllegalArgumentException e) {
+		} catch (final IllegalArgumentException e) {
 			return new File(normalPath).toURI().normalize();
 		}
 		return new File(normalPath).toURI().normalize();
@@ -445,7 +445,7 @@ protected static Path createDirectories(Path dir, final FileAttribute<?>... attr
 			// don't have permission to get absolute path
 			se = x;
 		}
-		// find a decendent that exists
+		// find a descendant that exists
 		Path parent = dir.getParent();
 		while (parent != null) {
 			try {
@@ -485,7 +485,7 @@ protected static Path createDirectories(Path dir, final FileAttribute<?>... attr
 	 *
 	 * Used by createDirectories to attempt to create a directory. A no-op if the
 	 * directory already exists.
-	 * 
+	 *
 	 * @param dir directory path
 	 * @param attrs file attributes
 	 * @throws IOException the exception
diff --git a/src/main/java/org/janelia/saalfeldlab/n5/GsonUtils.java b/src/main/java/org/janelia/saalfeldlab/n5/GsonUtils.java
index d72307c0..f8a5677e 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/GsonUtils.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/GsonUtils.java
@@ -108,6 +108,7 @@ static <T> T readAttribute(
 	 * @return the deserialized attribute object, or {@code null} if
 	 *         {@code attribute} cannot deserialize to {@code T}
 	 */
+	@SuppressWarnings("unchecked")
 	static <T> T parseAttributeElement(final JsonElement attribute, final Gson gson, final Type type) throws JsonSyntaxException, NumberFormatException, ClassCastException {
 
 		if (attribute == null)
@@ -266,6 +267,7 @@ static <T> T getJsonAsArray(final Gson gson, final JsonArray array, final Class<
 		return getJsonAsArray(gson, array, TypeToken.get(cls).getType());
 	}
 
+	@SuppressWarnings("unchecked")
 	static <T> T getJsonAsArray(final Gson gson, final JsonArray array, final Type type) {
 
 		final Class<?> clazz = (type instanceof Class<?>) ? ((Class<?>)type) : null;
diff --git a/src/main/java/org/janelia/saalfeldlab/n5/LinkedAttributePathToken.java b/src/main/java/org/janelia/saalfeldlab/n5/LinkedAttributePathToken.java
index ca7a9504..6702b4c2 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/LinkedAttributePathToken.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/LinkedAttributePathToken.java
@@ -130,6 +130,7 @@ public boolean jsonCompatible(final JsonElement json) {
 	 *            to attempt to set to {@link #parentJson}
 	 * @return the value set to {@link #parentJson}.
 	 */
+	@SuppressWarnings("unchecked")
 	protected JsonElement setAndCreateParentElement(final JsonElement json) {
 
 		if (json == null || !jsonCompatible(json)) {
diff --git a/src/main/java/org/janelia/saalfeldlab/n5/cache/N5JsonCache.java b/src/main/java/org/janelia/saalfeldlab/n5/cache/N5JsonCache.java
index a9c85ce2..e00d10a5 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/cache/N5JsonCache.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/cache/N5JsonCache.java
@@ -60,6 +60,7 @@ public boolean isGroup() {
 		}
 	}
 
+	@SuppressWarnings("deprecation")
 	protected static class EmptyJson extends JsonElement {
 
 		@Override
diff --git a/src/test/java/org/janelia/saalfeldlab/n5/AbstractN5Test.java b/src/test/java/org/janelia/saalfeldlab/n5/AbstractN5Test.java
index 8fdd5281..6e2e9e8f 100644
--- a/src/test/java/org/janelia/saalfeldlab/n5/AbstractN5Test.java
+++ b/src/test/java/org/janelia/saalfeldlab/n5/AbstractN5Test.java
@@ -25,18 +25,13 @@
  */
 package org.janelia.saalfeldlab.n5;
 
-import com.google.gson.GsonBuilder;
-import com.google.gson.JsonArray;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonNull;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonParser;
-import com.google.gson.reflect.TypeToken;
-import org.janelia.saalfeldlab.n5.N5Exception.N5ClassCastException;
-import org.janelia.saalfeldlab.n5.N5Reader.Version;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThrows;
+import static org.junit.Assert.assertTrue;
 
 import java.io.IOException;
 import java.net.URISyntaxException;
@@ -53,13 +48,19 @@
 import java.util.concurrent.Executors;
 import java.util.function.Predicate;
 
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertThrows;
-import static org.junit.Assert.assertTrue;
+import org.janelia.saalfeldlab.n5.N5Exception.N5ClassCastException;
+import org.janelia.saalfeldlab.n5.N5Reader.Version;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.reflect.TypeToken;
 
 /**
  * Abstract base class for testing N5 functionality.
@@ -117,10 +118,10 @@ protected final N5Writer createTempN5Writer(String location, GsonBuilder gson) {
 	@After
 	public void removeTempWriters() {
 		synchronized (tempWriters) {
-			for (N5Writer writer : tempWriters) {
+			for (final N5Writer writer : tempWriters) {
 				try {
 					writer.remove();
-				} catch (Exception e) {
+				} catch (final Exception e) {
 				}
 			}
 			tempWriters.clear();
@@ -1168,6 +1169,7 @@ public static class TestData<T> {
 		public T attributeValue;
 		public Class<T> attributeClass;
 
+		@SuppressWarnings("unchecked")
 		public TestData(final String groupPath, final String key, final T attributeValue) {
 
 			this.groupPath = groupPath;