diff --git a/app/src/main/java/org/jd/gui/service/extension/ExtensionService.java b/app/src/main/java/org/jd/gui/service/extension/ExtensionService.java
index cc86481..a289c47 100644
--- a/app/src/main/java/org/jd/gui/service/extension/ExtensionService.java
+++ b/app/src/main/java/org/jd/gui/service/extension/ExtensionService.java
@@ -37,13 +37,13 @@ public class ExtensionService {
                 searchJarAndMetaInf(urls, extDirectory);
 
                 if (!urls.isEmpty()) {
-                    URL[] array = (URL[])urls.toArray();
+                    URL[] array = urls.toArray(new URL[urls.size()]);
                     Arrays.sort(array, URL_COMPARATOR);
                     extensionClassLoader = new URLClassLoader(array, ExtensionService.class.getClassLoader());
                 }
             }
         } catch (Exception e) {
-            ExceptionUtil.printStackTrace(e);
+            assert ExceptionUtil.printStackTrace(e);
         }
 
         extensionClassLoader = ExtensionService.class.getClassLoader();
diff --git a/app/src/main/java/org/jd/gui/util/net/UriUtil.java b/app/src/main/java/org/jd/gui/util/net/UriUtil.java
index 6be1fcd..da2b508 100644
--- a/app/src/main/java/org/jd/gui/util/net/UriUtil.java
+++ b/app/src/main/java/org/jd/gui/util/net/UriUtil.java
@@ -37,7 +37,7 @@ public class UriUtil {
                 try {
                     return new URI(uri.getScheme(), uri.getHost(), path, query, fragment);
                 } catch (URISyntaxException e) {
-                    ExceptionUtil.printStackTrace(e);
+                    assert ExceptionUtil.printStackTrace(e);
                 }
             }
         }