Address review comments by @aherbert

pom.xml

@@ -230,11 +230,6 @@ file comparators, endian transformation classes, and much more.
   </contributors>
 
   <dependencies>
-    <dependency>
-      <groupId>com.google.code.findbugs</groupId>
-      <artifactId>jsr305</artifactId>
-      <version>3.0.2</version>
-    </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter</artifactId>

src/main/java/org/apache/commons/io/output/ByteArrayOutputStream.java

@@ -20,14 +20,12 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 
-import javax.annotation.concurrent.ThreadSafe;
-
 /**
  * This class implements a ThreadSafe version of
  * {@link AbstractByteArrayOutputStream} using instance
  * synchronisation.
  */
-@ThreadSafe
+//@ThreadSafe
 public class ByteArrayOutputStream extends AbstractByteArrayOutputStream {
 
     /**

src/main/java/org/apache/commons/io/output/FastByteArrayOutputStream.java

@@ -20,15 +20,13 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 
-import javax.annotation.concurrent.NotThreadSafe;
-
 /**
  * This class implements a version of {@link AbstractByteArrayOutputStream}
  * <b>without</b> any concurrent thread safety.
  *
  * @since 2.7
  */
-@NotThreadSafe
+//@NotThreadSafe
 public final class FastByteArrayOutputStream extends AbstractByteArrayOutputStream {
 
     /**

src/test/java/org/apache/commons/io/output/ByteArrayOutputStreamTestCase.java

@@ -329,10 +329,10 @@ public void testStream(final String baosName, final BAOSFactory baosFactory) thr
 
     private static Stream<Arguments> baosFactories() {
         final BAOSFactory syncBaosFactory = size -> new ByteArrayOutputStream(size);
-        final BAOSFactory nonSyncBaos = size -> new FastByteArrayOutputStream(size);
+        final BAOSFactory nonSyncBaosFactory = size -> new FastByteArrayOutputStream(size);
         return Stream.of(
                 Arguments.of(ByteArrayOutputStream.class.getSimpleName(), syncBaosFactory),
-                Arguments.of(FastByteArrayOutputStream.class.getSimpleName(), nonSyncBaos)
+                Arguments.of(FastByteArrayOutputStream.class.getSimpleName(), nonSyncBaosFactory)
         );
     }