diff --git a/src/java/com/wolfssl/WolfSSL.java b/src/java/com/wolfssl/WolfSSL.java
index 17b35196..486b463a 100644
--- a/src/java/com/wolfssl/WolfSSL.java
+++ b/src/java/com/wolfssl/WolfSSL.java
@@ -21,6 +21,11 @@
 
 package com.wolfssl;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.FileNotFoundException;
+
 /**
  * Base class which wraps the native WolfSSL embedded SSL library.
  * This class contains library init and cleanup methods, general callback
@@ -707,6 +712,56 @@ public static void loadLibraryAbsolute(String libPath)
         System.load(libPath);
     }
 
+    /* ----------------- generic static helper functions ---------------- */
+
+    /**
+     * Read a File into byte array.
+     *
+     * This method can't use the java.nio package since we have users
+     * on Android API 24 which does not support java.nio.
+     *
+     * @param file File to read into byte array
+     *
+     * @return byte array representing input File, or null if file is null
+     */
+    protected static byte[] fileToBytes(File file)
+        throws FileNotFoundException, IOException {
+
+        int bytesRead = 0;
+        long fileLen = 0;
+        byte[] fileBytes = null;
+        FileInputStream fis = null;
+
+        if (file == null) {
+            return null;
+        }
+
+        fileLen = file.length();
+        if (fileLen == 0) {
+            return new byte[0];
+        }
+
+        try {
+            fis = new FileInputStream(file);
+            if (fis != null) {
+                fileBytes = new byte[(int)fileLen];
+
+                bytesRead = fis.read(fileBytes);
+
+                if (bytesRead != fileLen) {
+                    throw new IOException("Unable to read entire file: " +
+                        file.getAbsolutePath());
+                }
+            }
+        } finally {
+            if (fis != null) {
+                fis.close();
+            }
+        }
+
+        return fileBytes;
+    }
+
     /* --------------- native feature detection functions --------------- */
 
     /**
diff --git a/src/java/com/wolfssl/WolfSSLCertRequest.java b/src/java/com/wolfssl/WolfSSLCertRequest.java
index 2f4310d3..5fca5877 100644
--- a/src/java/com/wolfssl/WolfSSLCertRequest.java
+++ b/src/java/com/wolfssl/WolfSSLCertRequest.java
@@ -22,7 +22,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.file.Files;
 import java.nio.charset.Charset;
 import java.security.PublicKey;
 import java.security.PrivateKey;
@@ -243,6 +242,7 @@ public void setPublicKey(String filePath, int keyType, int format)
 
         int ret = 0;
         File keyFile = null;
+        byte[] fileBytes = null;
 
         confirmObjectIsActive();
 
@@ -256,7 +256,13 @@ public void setPublicKey(String filePath, int keyType, int format)
                 filePath);
         }
 
-        setPublicKey(Files.readAllBytes(keyFile.toPath()), keyType, format);
+        fileBytes = WolfSSL.fileToBytes(keyFile);
+        if (fileBytes == null) {
+            throw new WolfSSLException("Failed to read bytes from file: " +
+                filePath);
+        }
+
+        setPublicKey(fileBytes, keyType, format);
     }
 
     /**
@@ -506,6 +512,7 @@ public void signRequest(String filePath, int keyType, int format,
 
         int ret = 0;
         File keyFile = null;
+        byte[] fileBytes = null;
 
         confirmObjectIsActive();
 
@@ -519,8 +526,13 @@ public void signRequest(String filePath, int keyType, int format,
                 filePath);
         }
 
-        signRequest(Files.readAllBytes(keyFile.toPath()), keyType,
-            format, digestAlg);
+        fileBytes = WolfSSL.fileToBytes(keyFile);
+        if (fileBytes == null) {
+            throw new WolfSSLException("Failed to read bytes from file: " +
+                filePath);
+        }
+
+        signRequest(fileBytes, keyType, format, digestAlg);
     }
 
     /**
diff --git a/src/java/com/wolfssl/WolfSSLCertificate.java b/src/java/com/wolfssl/WolfSSLCertificate.java
index 18bc143d..e6db3421 100644
--- a/src/java/com/wolfssl/WolfSSLCertificate.java
+++ b/src/java/com/wolfssl/WolfSSLCertificate.java
@@ -496,6 +496,7 @@ public void setPublicKey(String filePath, int keyType, int format)
 
         int ret = 0;
         File keyFile = null;
+        byte[] fileBytes = null;
 
         confirmObjectIsActive();
 
@@ -509,7 +510,13 @@ public void setPublicKey(String filePath, int keyType, int format)
                 filePath);
         }
 
-        setPublicKey(Files.readAllBytes(keyFile.toPath()), keyType, format);
+        fileBytes = WolfSSL.fileToBytes(keyFile);
+        if (fileBytes == null) {
+            throw new WolfSSLException("Failed to read bytes from file: " +
+                filePath);
+        }
+
+        setPublicKey(fileBytes, keyType, format);
     }
 
     /**
@@ -882,6 +889,7 @@ public void signCert(String filePath, int keyType, int format,
 
         int ret = 0;
         File keyFile = null;
+        byte[] fileBytes = null;
 
         confirmObjectIsActive();
 
@@ -895,8 +903,13 @@ public void signCert(String filePath, int keyType, int format,
                 filePath);
         }
 
-        signCert(Files.readAllBytes(keyFile.toPath()), keyType, format,
-                 digestAlg);
+        fileBytes = WolfSSL.fileToBytes(keyFile);
+        if (fileBytes == null) {
+            throw new WolfSSLException("Failed to read bytes from file: " +
+                filePath);
+        }
+
+        signCert(fileBytes, keyType, format, digestAlg);
     }
 
     /**
diff --git a/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java b/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java
index 4edea2bf..94bb99f1 100644
--- a/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java
+++ b/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java
@@ -23,6 +23,7 @@
 import java.util.List;
 import java.util.ArrayList;
 import java.lang.reflect.Method;
+import java.lang.reflect.InvocationTargetException;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import javax.net.ssl.SSLParameters;
@@ -162,10 +163,24 @@ protected static void getApplicationProtocols(final SSLParameters in,
                 "WolfSSLJDK8Helper.getApplicationProtocols() cannot be null");
         }
 
-        String[] appProtos = in.getApplicationProtocols();
-        if (appProtos != null) {
-            /* call WolfSSLParameters.setApplicationProtocols() */
-            out.setApplicationProtocols(appProtos);
+        try {
+            /* Android API < 29 does not support SSLParameters
+             * getApplicationProtocols(). Use reflection here to conditionally
+             * call it if available */
+            Method meth = SSLParameters.class.getMethod(
+                "getApplicationProtocols");
+            if (meth == null) {
+                return;
+            }
+            String[] appProtos = (String[])meth.invoke(in);
+            if (appProtos != null) {
+                /* call WolfSSLParameters.setApplicationProtocols() */
+                out.setApplicationProtocols(appProtos);
+            }
+        } catch (NoSuchMethodException | IllegalAccessException |
+                 InvocationTargetException e) {
+            /* getApplicationProtocols() not available, just return */
+            return;
         }
     }