diff --git a/test/compiler/classUnloading/anonymousClass/TestAnonymousClassUnloading.java b/test/compiler/classUnloading/anonymousClass/TestAnonymousClassUnloading.java
index 6fbaf9cef72e8f46269a9e56fecc922cac9490a6..9ff45492f468b0674619600fb99bbe4ba614d670 100644
--- a/test/compiler/classUnloading/anonymousClass/TestAnonymousClassUnloading.java
+++ b/test/compiler/classUnloading/anonymousClass/TestAnonymousClassUnloading.java
@@ -22,9 +22,10 @@
  */
 
 import sun.hotspot.WhiteBox;
-import sun.misc.Unsafe;
 import sun.misc.IOUtils;
+import sun.misc.Unsafe;
 
+import java.io.IOException;
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.net.URLConnection;
@@ -108,7 +109,13 @@ public class TestAnonymousClassUnloading {
         // (1) Load an anonymous version of this class using the corresponding Unsafe method
         URL classUrl = TestAnonymousClassUnloading.class.getResource("TestAnonymousClassUnloading.class");
         URLConnection connection = classUrl.openConnection();
-        byte[] classBytes = IOUtils.readFully(connection.getInputStream(), connection.getContentLength(), true);
+
+        int length = connection.getContentLength();
+        byte[] classBytes = IOUtils.readAllBytes(connection.getInputStream());
+        if (length != -1 && classBytes.length != length) {
+            throw new IOException("Expected:" + length + ", actual: " + classBytes.length);
+        }
+
         Class<?> anonymousClass = UNSAFE.defineAnonymousClass(TestAnonymousClassUnloading.class, classBytes, null);
 
         // (2) Make sure all paths of doWork are profiled and compiled
diff --git a/test/runtime/8003720/VictimClassLoader.java b/test/runtime/8003720/VictimClassLoader.java
index 3505f7832f39b6dafa41354a630e43a674252ac7..e219fd60f9edb6fec7c97b76567e489c16f8a7e9 100644
--- a/test/runtime/8003720/VictimClassLoader.java
+++ b/test/runtime/8003720/VictimClassLoader.java
@@ -22,6 +22,8 @@
  *
  */
 
+import sun.misc.IOUtils;
+
 public class VictimClassLoader extends ClassLoader {
     public static long counter = 0;
 
@@ -72,8 +74,10 @@ public class VictimClassLoader extends ClassLoader {
     }
 
     static byte[] readFully(java.io.InputStream in, int len) throws java.io.IOException {
-        // Warning here:
-        return sun.misc.IOUtils.readFully(in, len, true);
+        byte[] b = IOUtils.readAllBytes(in);
+        if (len != -1 && b.length != len)
+            throw new java.io.IOException("Expected:" + len + ", actual:" + b.length);
+        return b;
     }
 
     public void finalize() {