diff --git a/src/main/java/org/kohsuke/github/GHObject.java b/src/main/java/org/kohsuke/github/GHObject.java
index 50aa0a6a86..aa7bbe7920 100644
--- a/src/main/java/org/kohsuke/github/GHObject.java
+++ b/src/main/java/org/kohsuke/github/GHObject.java
@@ -29,6 +29,10 @@ public Date getCreatedAt() throws IOException {
         return GitHub.parseDate(created_at);
     }
 
+    private Object createdAtStr(Date id, Class type) {
+        return created_at;
+    }
+
     /**
      * API URL of this object.
      */
@@ -57,4 +61,12 @@ public Date getUpdatedAt() throws IOException {
     public int getId() {
         return id;
     }
+
+    private Object intToString(int id, Class type) {
+        return String.valueOf(id);
+    }
+
+    private Object urlToString(URL url, Class type) {
+        return url==null ? null : url.toString();
+    }
 }
diff --git a/src/main/java/org/kohsuke/github/GHRelease.java b/src/main/java/org/kohsuke/github/GHRelease.java
index 901bb8f359..b61dc62b38 100644
--- a/src/main/java/org/kohsuke/github/GHRelease.java
+++ b/src/main/java/org/kohsuke/github/GHRelease.java
@@ -129,14 +129,9 @@ public GHAsset uploadAsset(File file, String contentType) throws IOException {
 
         String url = format("https://uploads.github.com%s/releases/%d/assets?name=%s",
                 owner.getApiTailUrl(""), getId(), file.getName());
-        FileInputStream istream = new FileInputStream(file);
-        try {
-            return builder.contentType(contentType)
-                .with(istream)
+        return builder.contentType(contentType)
+                .with(new FileInputStream(file))
                 .to(url, GHAsset.class).wrap(this);
-        } finally {
-            istream.close();
-        }
     }
 
     public List<GHAsset> getAssets() throws IOException {
diff --git a/src/main/java/org/kohsuke/github/GitHub.java b/src/main/java/org/kohsuke/github/GitHub.java
index 9e638bb4aa..2eaef53ceb 100644
--- a/src/main/java/org/kohsuke/github/GitHub.java
+++ b/src/main/java/org/kohsuke/github/GitHub.java
@@ -47,6 +47,7 @@
 import java.util.TimeZone;
 import java.util.concurrent.TimeUnit;
 
+import org.apache.commons.codec.Charsets;
 import org.apache.commons.codec.binary.Base64;
 
 import com.fasterxml.jackson.databind.DeserializationFeature;
@@ -129,12 +130,7 @@ public class GitHub {
         } else {
             if (password!=null) {
                 String authorization = (login + ':' + password);
-                final Charset charset;
-                try {
-                    charset = Charset.forName("UTF-8");
-                } catch (Exception ex) {
-                    throw new IOException("UTF-8 encoding is not supported", ex);
-                }
+                Charset charset = Charsets.UTF_8;
                 encodedAuthorization = "Basic "+new String(Base64.encodeBase64(authorization.getBytes(charset)), charset);
             } else {// anonymous access
                 encodedAuthorization = null;
diff --git a/src/main/java/org/kohsuke/github/Requester.java b/src/main/java/org/kohsuke/github/Requester.java
index 78ead072d9..b8b53b78cd 100644
--- a/src/main/java/org/kohsuke/github/Requester.java
+++ b/src/main/java/org/kohsuke/github/Requester.java
@@ -53,6 +53,8 @@
 import java.util.regex.Pattern;
 import java.util.zip.GZIPInputStream;
 
+import javax.annotation.WillClose;
+
 import static java.util.Arrays.asList;
 import static org.kohsuke.github.GitHub.*;
 
@@ -143,7 +145,7 @@ public Requester with(String key, Map<String, String> value) {
         return _with(key, value);
     }
 
-    public Requester with(InputStream body) {
+    public Requester with(@WillClose/*later*/ InputStream body) {
         this.body = body;
         return this;
     }