Properly close all input/output streams!

src/main/java/com/onarandombox/MultiverseCore/utils/UpdateChecker.java

@@ -8,6 +8,7 @@
 package com.onarandombox.MultiverseCore.utils;
 
 import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
@@ -54,6 +55,7 @@ public class UpdateChecker {
     }
 
     public void checkUpdate() {
+        BufferedReader rd = null;
         try {
             URL url = new URL("http://bukkit.onarandombox.com/multiverse/version.php?n=" + URLEncoder.encode(this.name, "UTF-8") + "&v=" + this.cversion);
             URLConnection conn = url.openConnection();
@@ -65,7 +67,7 @@ public class UpdateChecker {
                 return;
             }
 
-            BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
+            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
             String line;
             String version = null;
 
@@ -76,7 +78,6 @@ public class UpdateChecker {
             }
 
             if (version == null) {
-                rd.close();
                 return;
             }
 
@@ -92,6 +93,12 @@ public class UpdateChecker {
             rd.close();
         } catch (Exception e) {
             // No need to alert the user of any error here... it's not important.
+        } finally {
+            if (rd != null) {
+                try {
+                    rd.close();
+                } catch (IOException ignore) { }
+            }
         }
     }
 

src/main/java/com/onarandombox/MultiverseCore/utils/webpaste/HttpAPIClient.java

@@ -26,16 +26,25 @@ public abstract class HttpAPIClient {
      * @throws IOException When the I/O-operation failed.
      */
     protected final String exec(Object... args) throws IOException {
+
         URLConnection conn = new URL(String.format(this.urlFormat, args)).openConnection();
         conn.connect();
-        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
-        while (!reader.ready()); // wait until reader is ready, may not be necessary, SUPPRESS CHECKSTYLE: EmptyStatement
-
         StringBuilder ret = new StringBuilder();
-        while (reader.ready()) {
-            ret.append(reader.readLine()).append('\n');
+        BufferedReader reader = null;
+        try {
+            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
+            while (!reader.ready()); // wait until reader is ready, may not be necessary, SUPPRESS CHECKSTYLE: EmptyStatement
+
+            while (reader.ready()) {
+                ret.append(reader.readLine()).append('\n');
+            }
+        } finally {
+            if (reader != null) {
+                try {
+                    reader.close();
+                } catch (IOException ignore) { }
+            }
         }
-        reader.close();
         return ret.toString();
     }
 }

src/main/java/com/onarandombox/MultiverseCore/utils/webpaste/PastebinPasteService.java

@@ -1,6 +1,7 @@
 package com.onarandombox.MultiverseCore.utils.webpaste;
 
 import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.io.UnsupportedEncodingException;
@@ -54,24 +55,35 @@ public class PastebinPasteService implements PasteService {
      */
     @Override
     public String postData(String encodedData, URL url) throws PasteFailedException {
+        OutputStreamWriter wr = null;
+        BufferedReader rd = null;
         try {
             URLConnection conn = url.openConnection();
             conn.setDoOutput(true);
-            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
+            wr = new OutputStreamWriter(conn.getOutputStream());
             wr.write(encodedData);
             wr.flush();
 
-            BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
+            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
             String line;
             String pastebinUrl = "";
             while ((line = rd.readLine()) != null) {
                 pastebinUrl = line;
             }
-            wr.close();
-            rd.close();
             return pastebinUrl;
         } catch (Exception e) {
             throw new PasteFailedException(e);
+        } finally {
+            if (wr != null) {
+                try {
+                    wr.close();
+                } catch (IOException ignore) { }
+            }
+            if (rd != null) {
+                try {
+                    rd.close();
+                } catch (IOException ignore) { }
+            }
         }
     }
 }

src/main/java/com/onarandombox/MultiverseCore/utils/webpaste/PastiePasteService.java

@@ -1,6 +1,7 @@
 package com.onarandombox.MultiverseCore.utils.webpaste;
 
 import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.io.UnsupportedEncodingException;
@@ -55,14 +56,16 @@ public class PastiePasteService implements PasteService {
      */
     @Override
     public String postData(String encodedData, URL url) throws PasteFailedException {
+        OutputStreamWriter wr = null;
+        BufferedReader rd = null;
         try {
             URLConnection conn = url.openConnection();
             conn.setDoOutput(true);
-            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
+            wr = new OutputStreamWriter(conn.getOutputStream());
             wr.write(encodedData);
             wr.flush();
 
-            BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
+            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
             String line;
             String pastieUrl = "";
             Pattern pastiePattern = this.getURLMatchingPattern();
@@ -73,11 +76,20 @@ public class PastiePasteService implements PasteService {
                     pastieUrl = this.formatURL(pastieID);
                 }
             }
-            wr.close();
-            rd.close();
             return pastieUrl;
         } catch (Exception e) {
             throw new PasteFailedException(e);
+        } finally {
+            if (wr != null) {
+                try {
+                    wr.close();
+                } catch (IOException ignore) { }
+            }
+            if (rd != null) {
+                try {
+                    rd.close();
+                } catch (IOException ignore) { }
+            }
         }
     }